e71508e160
Add support for world transformations to wxDC too. Currently this is implemented in wxMSW only but could be easily provided in the ports that use wxGraphicsContext for wxDC implementation later. Closes #13092. git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@67588 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
1795 lines
58 KiB
Objective-C
1795 lines
58 KiB
Objective-C
/////////////////////////////////////////////////////////////////////////////
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// Name: dc.h
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// Purpose: interface of wxDC
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// Author: wxWidgets team
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// RCS-ID: $Id$
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// Licence: wxWindows licence
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/////////////////////////////////////////////////////////////////////////////
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/**
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Logical raster operations which can be used with wxDC::SetLogicalFunction
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and some other wxDC functions (e.g. wxDC::Blit and wxDC::StretchBlit).
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The description of the values below refer to how a generic @e src source pixel
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and the corresponding @e dst destination pixel gets combined together to produce
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the final pixel. E.g. @c wxCLEAR and @c wxSET completely ignore the source
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and the destination pixel and always put zeroes or ones in the final surface.
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*/
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enum wxRasterOperationMode
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{
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wxCLEAR, //!< 0
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wxXOR, //!< @e src XOR @e dst
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wxINVERT, //!< NOT @e dst
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wxOR_REVERSE, //!< @e src OR (NOT @e dst)
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wxAND_REVERSE, //!< @e src AND (NOT @e dst)
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wxCOPY, //!< @e src
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wxAND, //!< @e src AND @e dst
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wxAND_INVERT, //!< (NOT @e src) AND @e dst
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wxNO_OP, //!< @e dst
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wxNOR, //!< (NOT @e src) AND (NOT @e dst)
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wxEQUIV, //!< (NOT @e src) XOR @e dst
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wxSRC_INVERT, //!< (NOT @e src)
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wxOR_INVERT, //!< (NOT @e src) OR @e dst
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wxNAND, //!< (NOT @e src) OR (NOT @e dst)
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wxOR, //!< @e src OR @e dst
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wxSET //!< 1
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};
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/**
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Flood styles used by wxDC::FloodFill.
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*/
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enum wxFloodFillStyle
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{
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/** The flooding occurs until a colour other than the given colour is encountered. */
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wxFLOOD_SURFACE = 1,
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/** The area to be flooded is bounded by the given colour. */
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wxFLOOD_BORDER
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};
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/**
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The mapping used to transform @e logical units to @e device units.
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See wxDC::SetMapMode.
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*/
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enum wxMappingMode
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{
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/**
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Each logical unit is 1 device pixel.
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This is the default mapping mode for all wxDC-derived classes.
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*/
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wxMM_TEXT = 1,
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/** Each logical unit is 1 millimeter. */
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wxMM_METRIC,
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/** Each logical unit is 1/10 of a millimeter. */
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wxMM_LOMETRIC,
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/**
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Each logical unit is 1/20 of a @e "printer point", or 1/1440 of an inch
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(also known as "twip"). Equivalent to about 17.64 micrometers.
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*/
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wxMM_TWIPS,
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/**
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Each logical unit is a @e "printer point" i.e. 1/72 of an inch.
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Equivalent to about 353 micrometers.
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*/
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wxMM_POINTS
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};
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/**
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Simple collection of various font metrics.
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This object is returned by wxDC::GetFontMetrics().
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@since 2.9.2
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@library{wxcore}
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@category{dc,gdi}
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*/
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struct wxFontMetrics
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{
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/// Constructor initializes all fields to 0.
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wxFontMetrics();
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int height, ///< Total character height.
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ascent, ///< Part of the height above the baseline.
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descent, ///< Part of the height below the baseline.
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internalLeading, ///< Intra-line spacing.
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externalLeading, ///< Inter-line spacing.
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averageWidth; ///< Average font width, a.k.a. "x-width".
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};
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/**
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@class wxDC
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A wxDC is a @e "device context" onto which graphics and text can be drawn.
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It is intended to represent different output devices and offers a common
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abstract API for drawing on any of them.
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wxWidgets offers an alternative drawing API based on the modern drawing
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backends GDI+, CoreGraphics and Cairo. See wxGraphicsContext, wxGraphicsRenderer
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and related classes. There is also a wxGCDC linking the APIs by offering
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the wxDC API on top of a wxGraphicsContext.
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wxDC is an abstract base class and cannot be created directly.
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Use wxPaintDC, wxClientDC, wxWindowDC, wxScreenDC, wxMemoryDC or
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wxPrinterDC. Notice that device contexts which are associated with windows
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(i.e. wxClientDC, wxWindowDC and wxPaintDC) use the window font and colours
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by default (starting with wxWidgets 2.9.0) but the other device context
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classes use system-default values so you always must set the appropriate
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fonts and colours before using them.
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In addition to the versions of the methods documented below, there
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are also versions which accept single wxPoint parameter instead
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of the two wxCoord ones or wxPoint and wxSize instead of the four
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wxCoord parameters.
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Beginning with wxWidgets 2.9.0 the entire wxDC code has been
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reorganized. All platform dependent code (actually all drawing code)
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has been moved into backend classes which derive from a common
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wxDCImpl class. The user-visible classes such as wxClientDC and
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wxPaintDC merely forward all calls to the backend implementation.
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@section dc_units Device and logical units
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In the wxDC context there is a distinction between @e logical units and @e device units.
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@b Device units are the units native to the particular device; e.g. for a screen,
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a device unit is a @e pixel. For a printer, the device unit is defined by the
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resolution of the printer (usually given in @c DPI: dot-per-inch).
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All wxDC functions use instead @b logical units, unless where explicitly
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stated. Logical units are arbitrary units mapped to device units using
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the current mapping mode (see wxDC::SetMapMode).
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This mechanism allows to reuse the same code which prints on e.g. a window
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on the screen to print on e.g. a paper.
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@section dc_alpha_support Support for Transparency / Alpha Channel
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In general wxDC methods don't support alpha transparency and the alpha
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component of wxColour is simply ignored and you need to use wxGraphicsContext
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for full transparency support. There are, however, a few exceptions: first,
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under Mac OS X colours with alpha channel are supported in all the normal
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wxDC-derived classes as they use wxGraphicsContext internally. Second,
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under all platforms wxSVGFileDC also fully supports alpha channel. In both
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of these cases the instances of wxPen or wxBrush that are built from
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wxColour use the colour's alpha values when stroking or filling.
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@section Support for Transformation Matrix
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On some platforms (currently only under MSW and only on Windows NT, i.e.
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not Windows 9x/ME, systems) wxDC has support for applying an arbitrary
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affine transformation matrix to its coordinate system. Call
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CanUseTransformMatrix() to check if this support is available and then call
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SetTransformMatrix() if it is. If the transformation matrix is not
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supported, SetTransformMatrix() always simply returns false and doesn't do
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anything.
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@library{wxcore}
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@category{dc,gdi}
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@see @ref overview_dc, wxGraphicsContext, wxDCFontChanger, wxDCTextColourChanger,
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wxDCPenChanger, wxDCBrushChanger, wxDCClipper
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@todo Precise definition of default/initial state.
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@todo Pixelwise definition of operations (e.g. last point of a line not
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drawn).
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*/
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class wxDC : public wxObject
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{
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public:
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/**
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@name Coordinate conversion functions
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*/
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//@{
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/**
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Convert @e device X coordinate to logical coordinate, using the current
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mapping mode, user scale factor, device origin and axis orientation.
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*/
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wxCoord DeviceToLogicalX(wxCoord x) const;
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/**
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Convert @e device X coordinate to relative logical coordinate, using the
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current mapping mode and user scale factor but ignoring the
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axis orientation. Use this for converting a width, for example.
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*/
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wxCoord DeviceToLogicalXRel(wxCoord x) const;
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/**
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Converts @e device Y coordinate to logical coordinate, using the current
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mapping mode, user scale factor, device origin and axis orientation.
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*/
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wxCoord DeviceToLogicalY(wxCoord y) const;
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/**
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Convert @e device Y coordinate to relative logical coordinate, using the
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current mapping mode and user scale factor but ignoring the
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axis orientation. Use this for converting a height, for example.
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*/
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wxCoord DeviceToLogicalYRel(wxCoord y) const;
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/**
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Converts logical X coordinate to device coordinate, using the current
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mapping mode, user scale factor, device origin and axis orientation.
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*/
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wxCoord LogicalToDeviceX(wxCoord x) const;
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/**
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Converts logical X coordinate to relative device coordinate, using the
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current mapping mode and user scale factor but ignoring the
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axis orientation. Use this for converting a width, for example.
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*/
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wxCoord LogicalToDeviceXRel(wxCoord x) const;
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/**
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Converts logical Y coordinate to device coordinate, using the current
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mapping mode, user scale factor, device origin and axis orientation.
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*/
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wxCoord LogicalToDeviceY(wxCoord y) const;
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/**
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Converts logical Y coordinate to relative device coordinate, using the
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current mapping mode and user scale factor but ignoring the
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axis orientation. Use this for converting a height, for example.
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*/
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wxCoord LogicalToDeviceYRel(wxCoord y) const;
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//@}
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/**
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@name Drawing functions
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*/
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//@{
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/**
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Clears the device context using the current background brush.
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*/
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void Clear();
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/**
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Draws an arc of a circle, centred on (@a xc, @a yc), with starting
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point (@a xStart, @a yStart) and ending at (@a xEnd, @a yEnd).
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The current pen is used for the outline and the current brush for
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filling the shape.
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The arc is drawn in a counter-clockwise direction from the start point
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to the end point.
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*/
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void DrawArc(wxCoord xStart, wxCoord yStart, wxCoord xEnd, wxCoord yEnd,
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wxCoord xc, wxCoord yc);
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/**
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@overload
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*/
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void DrawArc(const wxPoint& ptStart, const wxPoint& ptEnd, const wxPoint& centre);
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/**
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Draw a bitmap on the device context at the specified point. If
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@a transparent is @true and the bitmap has a transparency mask, the
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bitmap will be drawn transparently.
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When drawing a mono-bitmap, the current text foreground colour will be
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used to draw the foreground of the bitmap (all bits set to 1), and the
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current text background colour to draw the background (all bits set to
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0).
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@see SetTextForeground(), SetTextBackground(), wxMemoryDC
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*/
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void DrawBitmap(const wxBitmap& bitmap, wxCoord x, wxCoord y,
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bool useMask = false);
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/**
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@overload
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*/
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void DrawBitmap(const wxBitmap &bmp, const wxPoint& pt,
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bool useMask = false);
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/**
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Draws a check mark inside the given rectangle.
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*/
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void DrawCheckMark(wxCoord x, wxCoord y, wxCoord width, wxCoord height);
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/**
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@overload
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*/
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void DrawCheckMark(const wxRect& rect);
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/**
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Draws a circle with the given centre and radius.
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@see DrawEllipse()
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*/
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void DrawCircle(wxCoord x, wxCoord y, wxCoord radius);
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/**
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@overload
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*/
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void DrawCircle(const wxPoint& pt, wxCoord radius);
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/**
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Draws an ellipse contained in the rectangle specified either with the
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given top left corner and the given size or directly. The current pen
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is used for the outline and the current brush for filling the shape.
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@see DrawCircle()
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*/
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void DrawEllipse(wxCoord x, wxCoord y, wxCoord width, wxCoord height);
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/**
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@overload
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*/
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void DrawEllipse(const wxPoint& pt, const wxSize& size);
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/**
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@overload
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*/
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void DrawEllipse(const wxRect& rect);
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/**
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Draws an arc of an ellipse. The current pen is used for drawing the arc
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and the current brush is used for drawing the pie.
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@a x and @a y specify the x and y coordinates of the upper-left corner
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of the rectangle that contains the ellipse.
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@a width and @a height specify the width and height of the rectangle
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that contains the ellipse.
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@a start and @a end specify the start and end of the arc relative to
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the three-o'clock position from the center of the rectangle. Angles are
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specified in degrees (360 is a complete circle). Positive values mean
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counter-clockwise motion. If @a start is equal to @e end, a complete
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ellipse will be drawn.
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*/
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void DrawEllipticArc(wxCoord x, wxCoord y, wxCoord width, wxCoord height,
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double start, double end);
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/**
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@overload
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*/
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void DrawEllipticArc(const wxPoint& pt, const wxSize& sz,
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double sa, double ea);
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/**
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Draw an icon on the display (does nothing if the device context is
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PostScript). This can be the simplest way of drawing bitmaps on a
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window.
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*/
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void DrawIcon(const wxIcon& icon, wxCoord x, wxCoord y);
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/**
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@overload
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*/
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void DrawIcon(const wxIcon& icon, const wxPoint& pt);
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/**
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Draw optional bitmap and the text into the given rectangle and aligns
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it as specified by alignment parameter; it also will emphasize the
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character with the given index if it is != -1 and return the bounding
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rectangle if required.
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*/
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void DrawLabel(const wxString& text, const wxBitmap& image,
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const wxRect& rect,
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int alignment = wxALIGN_LEFT | wxALIGN_TOP,
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int indexAccel = -1, wxRect* rectBounding = NULL);
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/**
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@overload
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*/
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void DrawLabel(const wxString& text, const wxRect& rect,
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int alignment = wxALIGN_LEFT | wxALIGN_TOP,
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int indexAccel = -1);
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/**
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Draws a line from the first point to the second. The current pen is
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used for drawing the line. Note that the point (@a x2, @a y2) is not
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part of the line and is not drawn by this function (this is consistent
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with the behaviour of many other toolkits).
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*/
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void DrawLine(wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2);
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/**
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@overload
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*/
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void DrawLine(const wxPoint& pt1, const wxPoint& pt2);
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/**
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Draws lines using an array of points of size @a n adding the optional
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offset coordinate. The current pen is used for drawing the lines.
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@beginWxPythonOnly
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The wxPython version of this method accepts a Python list of wxPoint
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objects.
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@endWxPythonOnly
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@beginWxPerlOnly
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Not supported by wxPerl.
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@endWxPerlOnly
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*/
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void DrawLines(int n, wxPoint points[], wxCoord xoffset = 0,
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wxCoord yoffset = 0);
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/**
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This method uses a list of wxPoints, adding the optional offset
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coordinate. The programmer is responsible for deleting the list of
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points.
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@beginWxPythonOnly
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The wxPython version of this method accepts a Python list of wxPoint
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objects.
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@endWxPythonOnly
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@beginWxPerlOnly
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The wxPerl version of this method accepts
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as its first parameter a reference to an array
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of wxPoint objects.
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@endWxPerlOnly
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*/
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void DrawLines(const wxPointList* points,
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wxCoord xoffset = 0, wxCoord yoffset = 0);
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/**
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Draws a point using the color of the current pen. Note that the other
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properties of the pen are not used, such as width.
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*/
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void DrawPoint(wxCoord x, wxCoord y);
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/**
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@overload
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*/
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void DrawPoint(const wxPoint& pt);
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/**
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Draws a filled polygon using an array of points of size @a n, adding
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the optional offset coordinate. The first and last points are
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automatically closed.
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The last argument specifies the fill rule: @b wxODDEVEN_RULE (the
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default) or @b wxWINDING_RULE.
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The current pen is used for drawing the outline, and the current brush
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for filling the shape. Using a transparent brush suppresses filling.
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@beginWxPerlOnly
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Not supported by wxPerl.
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@endWxPerlOnly
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*/
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void DrawPolygon(int n, wxPoint points[], wxCoord xoffset = 0,
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wxCoord yoffset = 0,
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wxPolygonFillMode fill_style = wxODDEVEN_RULE);
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/**
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This method draws a filled polygon using a list of wxPoints, adding the
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optional offset coordinate. The first and last points are automatically
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closed.
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The last argument specifies the fill rule: @b wxODDEVEN_RULE (the
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default) or @b wxWINDING_RULE.
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The current pen is used for drawing the outline, and the current brush
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for filling the shape. Using a transparent brush suppresses filling.
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The programmer is responsible for deleting the list of points.
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@beginWxPythonOnly
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The wxPython version of this method accepts a Python list of wxPoint
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objects.
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@endWxPythonOnly
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@beginWxPerlOnly
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The wxPerl version of this method accepts
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as its first parameter a reference to an array
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of wxPoint objects.
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@endWxPerlOnly
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*/
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void DrawPolygon(const wxPointList* points,
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wxCoord xoffset = 0, wxCoord yoffset = 0,
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wxPolygonFillMode fill_style = wxODDEVEN_RULE);
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/**
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Draws two or more filled polygons using an array of @a points, adding
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the optional offset coordinates.
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Notice that for the platforms providing a native implementation of this
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function (Windows and PostScript-based wxDC currently), this is more
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efficient than using DrawPolygon() in a loop.
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@a n specifies the number of polygons to draw, the array @e count of
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size @a n specifies the number of points in each of the polygons in the
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@a points array.
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The last argument specifies the fill rule: @b wxODDEVEN_RULE (the
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default) or @b wxWINDING_RULE.
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The current pen is used for drawing the outline, and the current brush
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for filling the shape. Using a transparent brush suppresses filling.
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The polygons maybe disjoint or overlapping. Each polygon specified in a
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call to DrawPolyPolygon() must be closed. Unlike polygons created by
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the DrawPolygon() member function, the polygons created by this
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method are not closed automatically.
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@beginWxPythonOnly
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Not implemented yet.
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@endWxPythonOnly
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*/
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void DrawPolyPolygon(int n, int count[], wxPoint points[],
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wxCoord xoffset = 0, wxCoord yoffset = 0,
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wxPolygonFillMode fill_style = wxODDEVEN_RULE);
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/**
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Draws a rectangle with the given top left corner, and with the given
|
|
size. The current pen is used for the outline and the current brush
|
|
for filling the shape.
|
|
*/
|
|
void DrawRectangle(wxCoord x, wxCoord y, wxCoord width, wxCoord height);
|
|
|
|
/**
|
|
@overload
|
|
*/
|
|
void DrawRectangle(const wxPoint& pt, const wxSize& sz);
|
|
|
|
/**
|
|
@overload
|
|
*/
|
|
void DrawRectangle(const wxRect& rect);
|
|
|
|
/**
|
|
Draws the text rotated by @a angle degrees
|
|
(positive angles are counterclockwise; the full angle is 360 degrees).
|
|
|
|
@note Under Win9x only TrueType fonts can be drawn by this function. In
|
|
particular, a font different from @c wxNORMAL_FONT should be used
|
|
as the latter is not a TrueType font. @c wxSWISS_FONT is an
|
|
example of a font which is.
|
|
|
|
@see DrawText()
|
|
*/
|
|
void DrawRotatedText(const wxString& text, wxCoord x, wxCoord y,
|
|
double angle);
|
|
|
|
/**
|
|
@overload
|
|
*/
|
|
void DrawRotatedText(const wxString& text, const wxPoint&,
|
|
double angle);
|
|
|
|
/**
|
|
Draws a rectangle with the given top left corner, and with the given
|
|
size. The corners are quarter-circles using the given radius. The
|
|
current pen is used for the outline and the current brush for filling
|
|
the shape.
|
|
|
|
If @a radius is positive, the value is assumed to be the radius of the
|
|
rounded corner. If @a radius is negative, the absolute value is assumed
|
|
to be the @e proportion of the smallest dimension of the rectangle.
|
|
This means that the corner can be a sensible size relative to the size
|
|
of the rectangle, and also avoids the strange effects X produces when
|
|
the corners are too big for the rectangle.
|
|
*/
|
|
void DrawRoundedRectangle(wxCoord x, wxCoord y, wxCoord width,
|
|
wxCoord height, double radius);
|
|
|
|
/**
|
|
@overload
|
|
*/
|
|
void DrawRoundedRectangle(const wxPoint& pt, const wxSize& sz,
|
|
double radius);
|
|
|
|
/**
|
|
@overload
|
|
*/
|
|
void DrawRoundedRectangle(const wxRect& rect, double radius);
|
|
|
|
/**
|
|
Draws a spline between all given points using the current pen.
|
|
|
|
@beginWxPythonOnly
|
|
The wxPython version of this method accepts a Python list of wxPoint
|
|
objects.
|
|
@endWxPythonOnly
|
|
|
|
@beginWxPerlOnly
|
|
Not supported by wxPerl.
|
|
@endWxPerlOnly
|
|
*/
|
|
void DrawSpline(int n, wxPoint points[]);
|
|
|
|
/**
|
|
@overload
|
|
|
|
|
|
@beginWxPerlOnly
|
|
The wxPerl version of this method accepts
|
|
as its first parameter a reference to an array
|
|
of wxPoint objects.
|
|
@endWxPerlOnly
|
|
*/
|
|
void DrawSpline(const wxPointList* points);
|
|
|
|
/**
|
|
@overload
|
|
|
|
|
|
@beginWxPerlOnly
|
|
Not supported by wxPerl.
|
|
@endWxPerlOnly
|
|
*/
|
|
void DrawSpline(wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2,
|
|
wxCoord x3, wxCoord y3);
|
|
|
|
/**
|
|
Draws a text string at the specified point, using the current text
|
|
font, and the current text foreground and background colours.
|
|
|
|
The coordinates refer to the top-left corner of the rectangle bounding
|
|
the string. See GetTextExtent() for how to get the dimensions of a text
|
|
string, which can be used to position the text more precisely and
|
|
DrawLabel() if you need to align the string differently.
|
|
|
|
Starting from wxWidgets 2.9.2 @a text parameter can be a multi-line
|
|
string, i.e. contain new line characters, and will be rendered
|
|
correctly.
|
|
|
|
@note The current @ref GetLogicalFunction() "logical function" is
|
|
ignored by this function.
|
|
*/
|
|
void DrawText(const wxString& text, wxCoord x, wxCoord y);
|
|
|
|
/**
|
|
@overload
|
|
*/
|
|
void DrawText(const wxString& text, const wxPoint& pt);
|
|
|
|
/**
|
|
Fill the area specified by rect with a radial gradient, starting from
|
|
@a initialColour at the centre of the circle and fading to
|
|
@a destColour on the circle outside.
|
|
|
|
The circle is placed at the centre of @a rect.
|
|
|
|
@note Currently this function is very slow, don't use it for real-time
|
|
drawing.
|
|
*/
|
|
void GradientFillConcentric(const wxRect& rect,
|
|
const wxColour& initialColour,
|
|
const wxColour& destColour);
|
|
|
|
/**
|
|
Fill the area specified by rect with a radial gradient, starting from
|
|
@a initialColour at the centre of the circle and fading to
|
|
@a destColour on the circle outside.
|
|
|
|
@a circleCenter are the relative coordinates of centre of the circle in
|
|
the specified @a rect.
|
|
|
|
@note Currently this function is very slow, don't use it for real-time
|
|
drawing.
|
|
*/
|
|
void GradientFillConcentric(const wxRect& rect,
|
|
const wxColour& initialColour,
|
|
const wxColour& destColour,
|
|
const wxPoint& circleCenter);
|
|
|
|
/**
|
|
Fill the area specified by @a rect with a linear gradient, starting
|
|
from @a initialColour and eventually fading to @e destColour.
|
|
|
|
The @a nDirection specifies the direction of the colour change, default is
|
|
to use @a initialColour on the left part of the rectangle and
|
|
@a destColour on the right one.
|
|
*/
|
|
void GradientFillLinear(const wxRect& rect, const wxColour& initialColour,
|
|
const wxColour& destColour,
|
|
wxDirection nDirection = wxRIGHT);
|
|
|
|
/**
|
|
Flood fills the device context starting from the given point, using
|
|
the current brush colour, and using a style:
|
|
|
|
- wxFLOOD_SURFACE: The flooding occurs until a colour other than the
|
|
given colour is encountered.
|
|
- wxFLOOD_BORDER: The area to be flooded is bounded by the given
|
|
colour.
|
|
|
|
@return @false if the operation failed.
|
|
|
|
@note The present implementation for non-Windows platforms may fail to
|
|
find colour borders if the pixels do not match the colour
|
|
exactly. However the function will still return @true.
|
|
*/
|
|
bool FloodFill(wxCoord x, wxCoord y, const wxColour& colour,
|
|
wxFloodFillStyle style = wxFLOOD_SURFACE);
|
|
|
|
/**
|
|
@overload
|
|
*/
|
|
bool FloodFill(const wxPoint& pt, const wxColour& col,
|
|
int style = wxFLOOD_SURFACE);
|
|
|
|
/**
|
|
Displays a cross hair using the current pen. This is a vertical and
|
|
horizontal line the height and width of the window, centred on the
|
|
given point.
|
|
*/
|
|
void CrossHair(wxCoord x, wxCoord y);
|
|
|
|
/**
|
|
@overload
|
|
*/
|
|
void CrossHair(const wxPoint& pt);
|
|
|
|
//@}
|
|
|
|
|
|
/**
|
|
@name Clipping region functions
|
|
*/
|
|
//@{
|
|
|
|
/**
|
|
Destroys the current clipping region so that none of the DC is clipped.
|
|
|
|
@see SetClippingRegion()
|
|
*/
|
|
void DestroyClippingRegion();
|
|
|
|
/**
|
|
Gets the rectangle surrounding the current clipping region.
|
|
|
|
@beginWxPythonOnly
|
|
No arguments are required and the four values defining the rectangle
|
|
are returned as a tuple.
|
|
@endWxPythonOnly
|
|
*/
|
|
void GetClippingBox(wxCoord *x, wxCoord *y, wxCoord *width, wxCoord *height) const;
|
|
|
|
/**
|
|
Sets the clipping region for this device context to the intersection of
|
|
the given region described by the parameters of this method and the
|
|
previously set clipping region.
|
|
|
|
The clipping region is an area to which drawing is restricted. Possible
|
|
uses for the clipping region are for clipping text or for speeding up
|
|
window redraws when only a known area of the screen is damaged.
|
|
|
|
Notice that you need to call DestroyClippingRegion() if you want to set
|
|
the clipping region exactly to the region specified.
|
|
|
|
Also note that if the clipping region is empty, any previously set
|
|
clipping region is destroyed, i.e. it is equivalent to calling
|
|
DestroyClippingRegion(), and not to clipping out all drawing on the DC
|
|
as might be expected.
|
|
|
|
@see DestroyClippingRegion(), wxRegion
|
|
*/
|
|
void SetClippingRegion(wxCoord x, wxCoord y, wxCoord width, wxCoord height);
|
|
|
|
/**
|
|
@overload
|
|
*/
|
|
void SetClippingRegion(const wxPoint& pt, const wxSize& sz);
|
|
|
|
/**
|
|
@overload
|
|
*/
|
|
void SetClippingRegion(const wxRect& rect);
|
|
|
|
/**
|
|
Sets the clipping region for this device context.
|
|
|
|
Unlike SetClippingRegion(), this function works with physical
|
|
coordinates and not with the logical ones.
|
|
*/
|
|
void SetDeviceClippingRegion(const wxRegion& region);
|
|
|
|
//@}
|
|
|
|
|
|
/**
|
|
@name Text/character extent functions
|
|
*/
|
|
//@{
|
|
|
|
/**
|
|
Gets the character height of the currently set font.
|
|
*/
|
|
wxCoord GetCharHeight() const;
|
|
|
|
/**
|
|
Gets the average character width of the currently set font.
|
|
*/
|
|
wxCoord GetCharWidth() const;
|
|
|
|
/**
|
|
Returns the various font characteristics.
|
|
|
|
This method allows to retrieve some of the font characteristics not
|
|
returned by GetTextExtent(), notably internal leading and average
|
|
character width.
|
|
|
|
Currently this method returns correct results only under wxMSW, in the
|
|
other ports the internal leading will always be 0 and the average
|
|
character width will be computed as the width of the character 'x'.
|
|
|
|
@since 2.9.2
|
|
*/
|
|
wxFontMetrics GetFontMetrics() const;
|
|
|
|
/**
|
|
Gets the dimensions of the string using the currently selected font.
|
|
@a string is the text string to measure, @e heightLine, if non @NULL,
|
|
is where to store the height of a single line.
|
|
|
|
The text extent is set in the given @a w and @a h pointers.
|
|
|
|
If the optional parameter @a font is specified and valid, then it is
|
|
used for the text extent calculation, otherwise the currently selected
|
|
font is used.
|
|
|
|
@note This function works with both single-line and multi-line strings.
|
|
|
|
@beginWxPerlOnly
|
|
In wxPerl this method is implemented as
|
|
GetMultiLineTextExtent(string, font = undef) returning a
|
|
3-element list (width, height, line_height)
|
|
@endWxPerlOnly
|
|
|
|
@see wxFont, SetFont(), GetPartialTextExtents(), GetTextExtent()
|
|
*/
|
|
void GetMultiLineTextExtent(const wxString& string, wxCoord* w,
|
|
wxCoord* h,
|
|
wxCoord* heightLine = NULL,
|
|
const wxFont* font = NULL) const;
|
|
/**
|
|
Gets the dimensions of the string using the currently selected font.
|
|
@a string is the text string to measure, @e heightLine, if non @NULL,
|
|
is where to store the height of a single line.
|
|
|
|
@return The text extent as a wxSize object.
|
|
|
|
@note This function works with both single-line and multi-line strings.
|
|
|
|
@beginWxPerlOnly
|
|
Not supported by wxPerl.
|
|
@endWxPerlOnly
|
|
|
|
@see wxFont, SetFont(), GetPartialTextExtents(), GetTextExtent()
|
|
*/
|
|
wxSize GetMultiLineTextExtent(const wxString& string) const;
|
|
|
|
/**
|
|
Fills the @a widths array with the widths from the beginning of @a text
|
|
to the corresponding character of @a text. The generic version simply
|
|
builds a running total of the widths of each character using
|
|
GetTextExtent(), however if the various platforms have a native API
|
|
function that is faster or more accurate than the generic
|
|
implementation then it should be used instead.
|
|
|
|
@beginWxPythonOnly
|
|
This method only takes the @a text parameter and returns a Python list
|
|
of integers.
|
|
@endWxPythonOnly
|
|
|
|
@beginWxPerlOnly
|
|
In wxPerl this method only takes the @a text parameter and
|
|
returns the widths as a list of integers.
|
|
@endWxPerlOnly
|
|
|
|
@see GetMultiLineTextExtent(), GetTextExtent()
|
|
*/
|
|
bool GetPartialTextExtents(const wxString& text,
|
|
wxArrayInt& widths) const;
|
|
|
|
/**
|
|
Gets the dimensions of the string using the currently selected font.
|
|
@a string is the text string to measure, @a descent is the dimension
|
|
from the baseline of the font to the bottom of the descender, and
|
|
@a externalLeading is any extra vertical space added to the font by the
|
|
font designer (usually is zero).
|
|
|
|
The text extent is returned in @a w and @a h pointers or as a wxSize
|
|
object depending on which version of this function is used.
|
|
|
|
If the optional parameter @a font is specified and valid, then it is
|
|
used for the text extent calculation. Otherwise the currently selected
|
|
font is.
|
|
|
|
@note This function only works with single-line strings.
|
|
|
|
@beginWxPythonOnly
|
|
The following methods are implemented in wxPython:
|
|
- GetTextExtent(string) - Returns a 2-tuple, (width, height).
|
|
- GetFullTextExtent(string, font=NULL) -
|
|
Returns a 4-tuple, (width, height, descent, externalLeading).
|
|
@endWxPythonOnly
|
|
|
|
@beginWxPerlOnly
|
|
In wxPerl this method is implemented as GetTextExtent(string,
|
|
font = undef) returning a 4-element list (width, height,
|
|
descent, externalLeading)
|
|
@endWxPerlOnly
|
|
|
|
@see wxFont, SetFont(), GetPartialTextExtents(),
|
|
GetMultiLineTextExtent()
|
|
*/
|
|
void GetTextExtent(const wxString& string, wxCoord* w, wxCoord* h,
|
|
wxCoord* descent = NULL,
|
|
wxCoord* externalLeading = NULL,
|
|
const wxFont* font = NULL) const;
|
|
|
|
/**
|
|
@overload
|
|
|
|
|
|
@beginWxPerlOnly
|
|
Not supported by wxPerl.
|
|
@endWxPerlOnly
|
|
*/
|
|
wxSize GetTextExtent(const wxString& string) const;
|
|
|
|
//@}
|
|
|
|
|
|
/**
|
|
@name Text properties functions
|
|
*/
|
|
//@{
|
|
|
|
/**
|
|
Returns the current background mode: @c wxSOLID or @c wxTRANSPARENT.
|
|
|
|
@see SetBackgroundMode()
|
|
*/
|
|
int GetBackgroundMode() const;
|
|
|
|
/**
|
|
Gets the current font.
|
|
|
|
Notice that even although each device context object has some default font
|
|
after creation, this method would return a ::wxNullFont initially and only
|
|
after calling SetFont() a valid font is returned.
|
|
*/
|
|
const wxFont& GetFont() const;
|
|
|
|
/**
|
|
Gets the current layout direction of the device context. On platforms
|
|
where RTL layout is supported, the return value will either be
|
|
@c wxLayout_LeftToRight or @c wxLayout_RightToLeft. If RTL layout is
|
|
not supported, the return value will be @c wxLayout_Default.
|
|
|
|
@see SetLayoutDirection()
|
|
*/
|
|
wxLayoutDirection GetLayoutDirection() const;
|
|
|
|
/**
|
|
Gets the current text background colour.
|
|
|
|
@see SetTextBackground()
|
|
*/
|
|
const wxColour& GetTextBackground() const;
|
|
|
|
/**
|
|
Gets the current text foreground colour.
|
|
|
|
@see SetTextForeground()
|
|
*/
|
|
const wxColour& GetTextForeground() const;
|
|
|
|
/**
|
|
@a mode may be one of @c wxSOLID and @c wxTRANSPARENT.
|
|
|
|
This setting determines whether text will be drawn with a background
|
|
colour or not.
|
|
*/
|
|
void SetBackgroundMode(int mode);
|
|
|
|
/**
|
|
Sets the current font for the DC.
|
|
|
|
If the argument is ::wxNullFont (or another invalid font; see wxFont::IsOk),
|
|
the current font is selected out of the device context (leaving wxDC without
|
|
any valid font), allowing the current font to be destroyed safely.
|
|
|
|
@see wxFont
|
|
*/
|
|
void SetFont(const wxFont& font);
|
|
|
|
/**
|
|
Sets the current text background colour for the DC.
|
|
*/
|
|
void SetTextBackground(const wxColour& colour);
|
|
|
|
/**
|
|
Sets the current text foreground colour for the DC.
|
|
|
|
@see wxMemoryDC for the interpretation of colours when drawing into a
|
|
monochrome bitmap.
|
|
*/
|
|
void SetTextForeground(const wxColour& colour);
|
|
|
|
/**
|
|
Sets the current layout direction for the device context.
|
|
|
|
@param dir
|
|
May be either @c wxLayout_Default, @c wxLayout_LeftToRight or
|
|
@c wxLayout_RightToLeft.
|
|
|
|
@see GetLayoutDirection()
|
|
*/
|
|
void SetLayoutDirection(wxLayoutDirection dir);
|
|
|
|
//@}
|
|
|
|
|
|
/**
|
|
@name Bounding box functions
|
|
*/
|
|
//@{
|
|
|
|
/**
|
|
Adds the specified point to the bounding box which can be retrieved
|
|
with MinX(), MaxX() and MinY(), MaxY() functions.
|
|
|
|
@see ResetBoundingBox()
|
|
*/
|
|
void CalcBoundingBox(wxCoord x, wxCoord y);
|
|
|
|
/**
|
|
Gets the maximum horizontal extent used in drawing commands so far.
|
|
*/
|
|
wxCoord MaxX() const;
|
|
|
|
/**
|
|
Gets the maximum vertical extent used in drawing commands so far.
|
|
*/
|
|
wxCoord MaxY() const;
|
|
|
|
/**
|
|
Gets the minimum horizontal extent used in drawing commands so far.
|
|
*/
|
|
wxCoord MinX() const;
|
|
|
|
/**
|
|
Gets the minimum vertical extent used in drawing commands so far.
|
|
*/
|
|
wxCoord MinY() const;
|
|
|
|
/**
|
|
Resets the bounding box: after a call to this function, the bounding
|
|
box doesn't contain anything.
|
|
|
|
@see CalcBoundingBox()
|
|
*/
|
|
void ResetBoundingBox();
|
|
|
|
//@}
|
|
|
|
|
|
/**
|
|
@name Page and document start/end functions
|
|
*/
|
|
//@{
|
|
|
|
/**
|
|
Starts a document (only relevant when outputting to a printer).
|
|
@a message is a message to show while printing.
|
|
*/
|
|
bool StartDoc(const wxString& message);
|
|
|
|
/**
|
|
Starts a document page (only relevant when outputting to a printer).
|
|
*/
|
|
void StartPage();
|
|
|
|
/**
|
|
Ends a document (only relevant when outputting to a printer).
|
|
*/
|
|
void EndDoc();
|
|
|
|
/**
|
|
Ends a document page (only relevant when outputting to a printer).
|
|
*/
|
|
void EndPage();
|
|
|
|
//@}
|
|
|
|
|
|
/**
|
|
@name Bit-Block Transfer operations (blit)
|
|
*/
|
|
//@{
|
|
|
|
/**
|
|
Copy from a source DC to this DC, specifying the destination
|
|
coordinates, size of area to copy, source DC, source coordinates,
|
|
logical function, whether to use a bitmap mask, and mask source
|
|
position.
|
|
|
|
@param xdest
|
|
Destination device context x position.
|
|
@param ydest
|
|
Destination device context y position.
|
|
@param width
|
|
Width of source area to be copied.
|
|
@param height
|
|
Height of source area to be copied.
|
|
@param source
|
|
Source device context.
|
|
@param xsrc
|
|
Source device context x position.
|
|
@param ysrc
|
|
Source device context y position.
|
|
@param logicalFunc
|
|
Logical function to use, see SetLogicalFunction().
|
|
@param useMask
|
|
If @true, Blit does a transparent blit using the mask that is
|
|
associated with the bitmap selected into the source device context.
|
|
The Windows implementation does the following if MaskBlt cannot be
|
|
used:
|
|
<ol>
|
|
<li>Creates a temporary bitmap and copies the destination area into
|
|
it.</li>
|
|
<li>Copies the source area into the temporary bitmap using the
|
|
specified logical function.</li>
|
|
<li>Sets the masked area in the temporary bitmap to BLACK by ANDing
|
|
the mask bitmap with the temp bitmap with the foreground colour
|
|
set to WHITE and the bg colour set to BLACK.</li>
|
|
<li>Sets the unmasked area in the destination area to BLACK by
|
|
ANDing the mask bitmap with the destination area with the
|
|
foreground colour set to BLACK and the background colour set to
|
|
WHITE.</li>
|
|
<li>ORs the temporary bitmap with the destination area.</li>
|
|
<li>Deletes the temporary bitmap.</li>
|
|
</ol>
|
|
This sequence of operations ensures that the source's transparent
|
|
area need not be black, and logical functions are supported.
|
|
@n @b Note: on Windows, blitting with masks can be speeded up
|
|
considerably by compiling wxWidgets with the wxUSE_DC_CACHEING option
|
|
enabled. You can also influence whether MaskBlt or the explicit
|
|
mask blitting code above is used, by using wxSystemOptions and
|
|
setting the @c no-maskblt option to 1.
|
|
@param xsrcMask
|
|
Source x position on the mask. If both xsrcMask and ysrcMask are
|
|
@c -1, xsrc and ysrc will be assumed for the mask source position.
|
|
Currently only implemented on Windows.
|
|
@param ysrcMask
|
|
Source y position on the mask. If both xsrcMask and ysrcMask are
|
|
@c -1, xsrc and ysrc will be assumed for the mask source position.
|
|
Currently only implemented on Windows.
|
|
|
|
@remarks There is partial support for Blit() in wxPostScriptDC, under X.
|
|
|
|
@see StretchBlit(), wxMemoryDC, wxBitmap, wxMask
|
|
*/
|
|
bool Blit(wxCoord xdest, wxCoord ydest, wxCoord width,
|
|
wxCoord height, wxDC* source, wxCoord xsrc, wxCoord ysrc,
|
|
wxRasterOperationMode logicalFunc = wxCOPY, bool useMask = false,
|
|
wxCoord xsrcMask = wxDefaultCoord, wxCoord ysrcMask = wxDefaultCoord);
|
|
|
|
/**
|
|
Copy from a source DC to this DC, specifying the destination
|
|
coordinates, destination size, source DC, source coordinates, size of
|
|
source area to copy, logical function, whether to use a bitmap mask,
|
|
and mask source position.
|
|
|
|
@param xdest
|
|
Destination device context x position.
|
|
@param ydest
|
|
Destination device context y position.
|
|
@param dstWidth
|
|
Width of destination area.
|
|
@param dstHeight
|
|
Height of destination area.
|
|
@param source
|
|
Source device context.
|
|
@param xsrc
|
|
Source device context x position.
|
|
@param ysrc
|
|
Source device context y position.
|
|
@param srcWidth
|
|
Width of source area to be copied.
|
|
@param srcHeight
|
|
Height of source area to be copied.
|
|
@param logicalFunc
|
|
Logical function to use, see SetLogicalFunction().
|
|
@param useMask
|
|
If @true, Blit does a transparent blit using the mask that is
|
|
associated with the bitmap selected into the source device context.
|
|
The Windows implementation does the following if MaskBlt cannot be
|
|
used:
|
|
<ol>
|
|
<li>Creates a temporary bitmap and copies the destination area into
|
|
it.</li>
|
|
<li>Copies the source area into the temporary bitmap using the
|
|
specified logical function.</li>
|
|
<li>Sets the masked area in the temporary bitmap to BLACK by ANDing
|
|
the mask bitmap with the temp bitmap with the foreground colour
|
|
set to WHITE and the bg colour set to BLACK.</li>
|
|
<li>Sets the unmasked area in the destination area to BLACK by
|
|
ANDing the mask bitmap with the destination area with the
|
|
foreground colour set to BLACK and the background colour set to
|
|
WHITE.</li>
|
|
<li>ORs the temporary bitmap with the destination area.</li>
|
|
<li>Deletes the temporary bitmap.</li>
|
|
</ol>
|
|
This sequence of operations ensures that the source's transparent
|
|
area need not be black, and logical functions are supported.
|
|
@n @b Note: on Windows, blitting with masks can be speeded up
|
|
considerably by compiling wxWidgets with the wxUSE_DC_CACHEING option
|
|
enabled. You can also influence whether MaskBlt or the explicit
|
|
mask blitting code above is used, by using wxSystemOptions and
|
|
setting the @c no-maskblt option to 1.
|
|
@param xsrcMask
|
|
Source x position on the mask. If both xsrcMask and ysrcMask are
|
|
wxDefaultCoord, @a xsrc and @a ysrc will be assumed for the mask
|
|
source position. Currently only implemented on Windows.
|
|
@param ysrcMask
|
|
Source y position on the mask. If both xsrcMask and ysrcMask are
|
|
wxDefaultCoord, @a xsrc and @a ysrc will be assumed for the mask
|
|
source position. Currently only implemented on Windows.
|
|
|
|
There is partial support for Blit() in wxPostScriptDC, under X.
|
|
|
|
StretchBlit() is only implemented under wxMAC and wxMSW.
|
|
|
|
See wxMemoryDC for typical usage.
|
|
|
|
@since 2.9.0
|
|
|
|
@see Blit(), wxMemoryDC, wxBitmap, wxMask
|
|
*/
|
|
bool StretchBlit(wxCoord xdest, wxCoord ydest,
|
|
wxCoord dstWidth, wxCoord dstHeight,
|
|
wxDC* source, wxCoord xsrc, wxCoord ysrc,
|
|
wxCoord srcWidth, wxCoord srcHeight,
|
|
wxRasterOperationMode logicalFunc = wxCOPY,
|
|
bool useMask = false,
|
|
wxCoord xsrcMask = wxDefaultCoord,
|
|
wxCoord ysrcMask = wxDefaultCoord);
|
|
//@}
|
|
|
|
|
|
/**
|
|
@name Background/foreground brush and pen
|
|
*/
|
|
//@{
|
|
|
|
/**
|
|
Gets the brush used for painting the background.
|
|
|
|
@see wxDC::SetBackground()
|
|
*/
|
|
const wxBrush& GetBackground() const;
|
|
|
|
/**
|
|
Gets the current brush.
|
|
|
|
@see wxDC::SetBrush()
|
|
*/
|
|
const wxBrush& GetBrush() const;
|
|
|
|
/**
|
|
Gets the current pen.
|
|
|
|
@see SetPen()
|
|
*/
|
|
const wxPen& GetPen() const;
|
|
|
|
/**
|
|
Sets the current background brush for the DC.
|
|
*/
|
|
void SetBackground(const wxBrush& brush);
|
|
|
|
/**
|
|
Sets the current brush for the DC.
|
|
|
|
If the argument is ::wxNullBrush (or another invalid brush; see wxBrush::IsOk),
|
|
the current brush is selected out of the device context (leaving wxDC without
|
|
any valid brush), allowing the current brush to be destroyed safely.
|
|
|
|
@see wxBrush, wxMemoryDC (for the interpretation of colours when
|
|
drawing into a monochrome bitmap)
|
|
*/
|
|
void SetBrush(const wxBrush& brush);
|
|
|
|
/**
|
|
Sets the current pen for the DC.
|
|
|
|
If the argument is ::wxNullPen (or another invalid pen; see wxPen::IsOk),
|
|
the current pen is selected out of the device context (leaving wxDC without any
|
|
valid pen), allowing the current pen to be destroyed safely.
|
|
|
|
@see wxMemoryDC for the interpretation of colours when drawing into a
|
|
monochrome bitmap.
|
|
*/
|
|
void SetPen(const wxPen& pen);
|
|
|
|
//@}
|
|
|
|
|
|
/**
|
|
Copy attributes from another DC.
|
|
|
|
The copied attributes currently are:
|
|
- Font
|
|
- Text foreground and background colours
|
|
- Background brush
|
|
- Layout direction
|
|
|
|
@param dc
|
|
A valid (i.e. its IsOk() must return @true) source device context.
|
|
*/
|
|
void CopyAttributes(const wxDC& dc);
|
|
|
|
/**
|
|
Returns the depth (number of bits/pixel) of this DC.
|
|
|
|
@see wxDisplayDepth()
|
|
*/
|
|
int GetDepth() const;
|
|
|
|
/**
|
|
Returns the current device origin.
|
|
|
|
@see SetDeviceOrigin()
|
|
*/
|
|
wxPoint GetDeviceOrigin() const;
|
|
|
|
/**
|
|
Gets the current logical function.
|
|
|
|
@see SetLogicalFunction()
|
|
*/
|
|
wxRasterOperationMode GetLogicalFunction() const;
|
|
|
|
/**
|
|
Gets the current mapping mode for the device context.
|
|
|
|
@see SetMapMode()
|
|
*/
|
|
wxMappingMode GetMapMode() const;
|
|
|
|
/**
|
|
Gets in @a colour the colour at the specified location. Not available
|
|
for wxPostScriptDC or wxMetafileDC.
|
|
|
|
@note Setting a pixel can be done using DrawPoint().
|
|
|
|
@beginWxPythonOnly
|
|
The wxColour value is returned and is not required as a parameter.
|
|
@endWxPythonOnly
|
|
*/
|
|
bool GetPixel(wxCoord x, wxCoord y, wxColour* colour) const;
|
|
|
|
/**
|
|
Returns the resolution of the device in pixels per inch.
|
|
*/
|
|
wxSize GetPPI() const;
|
|
|
|
/**
|
|
Gets the horizontal and vertical extent of this device context in @e device units.
|
|
It can be used to scale graphics to fit the page.
|
|
|
|
For example, if @e maxX and @e maxY represent the maximum horizontal
|
|
and vertical 'pixel' values used in your application, the following
|
|
code will scale the graphic to fit on the printer page:
|
|
|
|
@code
|
|
wxCoord w, h;
|
|
dc.GetSize(&w, &h);
|
|
double scaleX = (double)(maxX / w);
|
|
double scaleY = (double)(maxY / h);
|
|
dc.SetUserScale(min(scaleX, scaleY),min(scaleX, scaleY));
|
|
@endcode
|
|
|
|
@beginWxPythonOnly
|
|
In place of a single overloaded method name, wxPython implements the
|
|
following methods:
|
|
- GetSize() - Returns a wxSize.
|
|
- GetSizeWH() - Returns a 2-tuple (width, height).
|
|
@endWxPythonOnly
|
|
|
|
@beginWxPerlOnly
|
|
In wxPerl there are two methods instead of a single overloaded
|
|
method:
|
|
- GetSize(): returns a Wx::Size object.
|
|
- GetSizeWH(): returns a 2-element list (width, height).
|
|
@endWxPerlOnly
|
|
*/
|
|
void GetSize(wxCoord* width, wxCoord* height) const;
|
|
|
|
/**
|
|
@overload
|
|
*/
|
|
wxSize GetSize() const;
|
|
|
|
/**
|
|
Returns the horizontal and vertical resolution in millimetres.
|
|
*/
|
|
void GetSizeMM(wxCoord* width, wxCoord* height) const;
|
|
|
|
/**
|
|
@overload
|
|
*/
|
|
wxSize GetSizeMM() const;
|
|
|
|
/**
|
|
Gets the current user scale factor.
|
|
|
|
@beginWxPerlOnly
|
|
In wxPerl this method takes no arguments and return a two
|
|
element array (x, y).
|
|
@endWxPerlOnly
|
|
|
|
@see SetUserScale()
|
|
*/
|
|
void GetUserScale(double* x, double* y) const;
|
|
|
|
/**
|
|
Returns @true if the DC is ok to use.
|
|
*/
|
|
bool IsOk() const;
|
|
|
|
/**
|
|
Sets the x and y axis orientation (i.e., the direction from lowest to
|
|
highest values on the axis). The default orientation is x axis from
|
|
left to right and y axis from top down.
|
|
|
|
@param xLeftRight
|
|
True to set the x axis orientation to the natural left to right
|
|
orientation, @false to invert it.
|
|
@param yBottomUp
|
|
True to set the y axis orientation to the natural bottom up
|
|
orientation, @false to invert it.
|
|
*/
|
|
void SetAxisOrientation(bool xLeftRight, bool yBottomUp);
|
|
|
|
/**
|
|
Sets the device origin (i.e., the origin in pixels after scaling has
|
|
been applied). This function may be useful in Windows printing
|
|
operations for placing a graphic on a page.
|
|
*/
|
|
void SetDeviceOrigin(wxCoord x, wxCoord y);
|
|
|
|
/**
|
|
Sets the current logical function for the device context.
|
|
It determines how a @e source pixel (from a pen or brush colour, or source
|
|
device context if using Blit()) combines with a @e destination pixel in
|
|
the current device context.
|
|
Text drawing is not affected by this function.
|
|
|
|
See ::wxRasterOperationMode enumeration values for more info.
|
|
|
|
The default is @c wxCOPY, which simply draws with the current colour.
|
|
The others combine the current colour and the background using a logical
|
|
operation. @c wxINVERT is commonly used for drawing rubber bands or moving
|
|
outlines, since drawing twice reverts to the original colour.
|
|
*/
|
|
void SetLogicalFunction(wxRasterOperationMode function);
|
|
|
|
/**
|
|
The mapping mode of the device context defines the unit of measurement
|
|
used to convert @e logical units to @e device units.
|
|
|
|
Note that in X, text drawing isn't handled consistently with the mapping mode;
|
|
a font is always specified in point size. However, setting the user scale (see
|
|
SetUserScale()) scales the text appropriately. In Windows, scalable
|
|
TrueType fonts are always used; in X, results depend on availability of
|
|
fonts, but usually a reasonable match is found.
|
|
|
|
The coordinate origin is always at the top left of the screen/printer.
|
|
|
|
Drawing to a Windows printer device context uses the current mapping
|
|
mode, but mapping mode is currently ignored for PostScript output.
|
|
*/
|
|
void SetMapMode(wxMappingMode mode);
|
|
|
|
/**
|
|
If this is a window DC or memory DC, assigns the given palette to the
|
|
window or bitmap associated with the DC. If the argument is
|
|
::wxNullPalette, the current palette is selected out of the device
|
|
context, and the original palette restored.
|
|
|
|
@see wxPalette
|
|
*/
|
|
void SetPalette(const wxPalette& palette);
|
|
|
|
/**
|
|
Sets the user scaling factor, useful for applications which require
|
|
'zooming'.
|
|
*/
|
|
void SetUserScale(double xScale, double yScale);
|
|
|
|
|
|
/**
|
|
@name Transformation matrix
|
|
|
|
See the notes about the availability of these functions in the class
|
|
documentation.
|
|
*/
|
|
//@{
|
|
|
|
/**
|
|
Check if the use of transformation matrix is supported by the current
|
|
system.
|
|
|
|
Currently this function always returns @false for non-MSW platforms and
|
|
may return @false for old (Windows 9x/ME) Windows systems. Normally
|
|
support for the transformation matrix is always available in any
|
|
relatively recent Windows versions.
|
|
|
|
@since 2.9.2
|
|
*/
|
|
bool CanUseTransformMatrix() const;
|
|
|
|
/**
|
|
Set the transformation matrix.
|
|
|
|
If transformation matrix is supported on the current system, the
|
|
specified @a matrix will be used to transform between wxDC and physical
|
|
coordinates. Otherwise the function returns @false and doesn't change
|
|
the coordinate mapping.
|
|
|
|
@since 2.9.2
|
|
*/
|
|
bool SetTransformMatrix(const wxAffineMatrix2D& matrix);
|
|
|
|
/**
|
|
Return the transformation matrix used by this device context.
|
|
|
|
By default the transformation matrix is the identity matrix.
|
|
|
|
@since 2.9.2
|
|
*/
|
|
wxAffineMatrix2D GetTransformMatrix() const;
|
|
|
|
/**
|
|
Revert the transformation matrix to identity matrix.
|
|
|
|
@since 2.9.2
|
|
*/
|
|
void ResetTransformMatrix();
|
|
|
|
//@}
|
|
};
|
|
|
|
|
|
|
|
/**
|
|
@class wxDCClipper
|
|
|
|
wxDCClipper is a small helper class for setting a clipping region on a wxDC
|
|
and unsetting it automatically. An object of wxDCClipper class is typically
|
|
created on the stack so that it is automatically destroyed when the object
|
|
goes out of scope. A typical usage example:
|
|
|
|
@code
|
|
void MyFunction(wxDC& dc)
|
|
{
|
|
wxDCClipper clip(dc, rect);
|
|
// ... drawing functions here are affected by clipping rect ...
|
|
}
|
|
|
|
void OtherFunction()
|
|
{
|
|
wxDC dc;
|
|
MyFunction(dc);
|
|
// ... drawing functions here are not affected by clipping rect ...
|
|
}
|
|
@endcode
|
|
|
|
@library{wxcore}
|
|
@category{gdi}
|
|
|
|
@see wxDC::SetClippingRegion(), wxDCFontChanger, wxDCTextColourChanger, wxDCPenChanger,
|
|
wxDCBrushChanger
|
|
*/
|
|
class wxDCClipper
|
|
{
|
|
public:
|
|
//@{
|
|
/**
|
|
Sets the clipping region to the specified region/coordinates.
|
|
|
|
The clipping region is automatically unset when this object is destroyed.
|
|
*/
|
|
wxDCClipper(wxDC& dc, const wxRegion& r);
|
|
wxDCClipper(wxDC& dc, const wxRect& rect);
|
|
wxDCClipper(wxDC& dc, wxCoord x, wxCoord y, wxCoord w, wxCoord h);
|
|
//@}
|
|
|
|
/**
|
|
Destroys the clipping region associated with the DC passed to the ctor.
|
|
*/
|
|
~wxDCClipper();
|
|
};
|
|
|
|
|
|
/**
|
|
@class wxDCBrushChanger
|
|
|
|
wxDCBrushChanger is a small helper class for setting a brush on a wxDC
|
|
and unsetting it automatically in the destructor, restoring the previous one.
|
|
|
|
@library{wxcore}
|
|
@category{gdi}
|
|
|
|
@see wxDC::SetBrush(), wxDCFontChanger, wxDCTextColourChanger, wxDCPenChanger,
|
|
wxDCClipper
|
|
*/
|
|
class wxDCBrushChanger
|
|
{
|
|
public:
|
|
/**
|
|
Sets @a brush on the given @a dc, storing the old one.
|
|
|
|
@param dc
|
|
The DC where the brush must be temporary set.
|
|
@param brush
|
|
The brush to set.
|
|
*/
|
|
wxDCBrushChanger(wxDC& dc, const wxBrush& brush);
|
|
|
|
/**
|
|
Restores the brush originally selected in the DC passed to the ctor.
|
|
*/
|
|
~wxDCBrushChanger();
|
|
};
|
|
|
|
|
|
/**
|
|
@class wxDCPenChanger
|
|
|
|
wxDCPenChanger is a small helper class for setting a pen on a wxDC
|
|
and unsetting it automatically in the destructor, restoring the previous one.
|
|
|
|
@library{wxcore}
|
|
@category{gdi}
|
|
|
|
@see wxDC::SetPen(), wxDCFontChanger, wxDCTextColourChanger, wxDCBrushChanger,
|
|
wxDCClipper
|
|
*/
|
|
class wxDCPenChanger
|
|
{
|
|
public:
|
|
/**
|
|
Sets @a pen on the given @a dc, storing the old one.
|
|
|
|
@param dc
|
|
The DC where the pen must be temporary set.
|
|
@param pen
|
|
The pen to set.
|
|
*/
|
|
wxDCPenChanger(wxDC& dc, const wxPen& pen);
|
|
|
|
/**
|
|
Restores the pen originally selected in the DC passed to the ctor.
|
|
*/
|
|
~wxDCPenChanger();
|
|
};
|
|
|
|
|
|
|
|
/**
|
|
@class wxDCTextColourChanger
|
|
|
|
wxDCTextColourChanger is a small helper class for setting a foreground
|
|
text colour on a wxDC and unsetting it automatically in the destructor,
|
|
restoring the previous one.
|
|
|
|
@library{wxcore}
|
|
@category{gdi}
|
|
|
|
@see wxDC::SetTextForeground(), wxDCFontChanger, wxDCPenChanger, wxDCBrushChanger,
|
|
wxDCClipper
|
|
*/
|
|
class wxDCTextColourChanger
|
|
{
|
|
public:
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|
/**
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|
Trivial constructor not changing anything.
|
|
|
|
This constructor is useful if you don't know beforehand if the colour
|
|
needs to be changed or not. It simply creates the object which won't do
|
|
anything in its destructor unless Set() is called -- in which case it
|
|
would reset the previous colour.
|
|
*/
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|
wxDCTextColourChanger(wxDC& dc);
|
|
|
|
/**
|
|
Sets @a col on the given @a dc, storing the old one.
|
|
|
|
@param dc
|
|
The DC where the colour must be temporary set.
|
|
@param col
|
|
The colour to set.
|
|
*/
|
|
wxDCTextColourChanger(wxDC& dc, const wxColour& col);
|
|
|
|
/**
|
|
Set the colour to use.
|
|
|
|
This method is meant to be called once only and only on the objects
|
|
created with the constructor overload not taking wxColour argument and
|
|
has the same effect as the other constructor, i.e. sets the colour to
|
|
the given @a col and ensures that the old value is restored when this
|
|
object is destroyed.
|
|
*/
|
|
void Set(const wxColour& col);
|
|
|
|
/**
|
|
Restores the colour originally selected in the DC passed to the ctor.
|
|
*/
|
|
~wxDCTextColourChanger();
|
|
};
|
|
|
|
|
|
|
|
/**
|
|
@class wxDCFontChanger
|
|
|
|
wxDCFontChanger is a small helper class for setting a font on a wxDC and
|
|
unsetting it automatically in the destructor, restoring the previous one.
|
|
|
|
@since 2.9.0
|
|
|
|
@library{wxcore}
|
|
@category{gdi}
|
|
|
|
@see wxDC::SetFont(), wxDCTextColourChanger, wxDCPenChanger, wxDCBrushChanger,
|
|
wxDCClipper
|
|
*/
|
|
class wxDCFontChanger
|
|
{
|
|
public:
|
|
/**
|
|
Trivial constructor not changing anything.
|
|
|
|
This constructor is useful if you don't know beforehand if the font
|
|
needs to be changed or not. It simply creates the object which won't do
|
|
anything in its destructor unless Set() is called -- in which case it
|
|
would reset the previous font.
|
|
|
|
@since 2.9.1
|
|
*/
|
|
wxDCFontChanger(wxDC& dc);
|
|
|
|
/**
|
|
Sets @a font on the given @a dc, storing the old one.
|
|
|
|
@param dc
|
|
The DC where the font must be temporary set.
|
|
@param font
|
|
The font to set.
|
|
*/
|
|
wxDCFontChanger(wxDC& dc, const wxFont& font);
|
|
|
|
/**
|
|
Set the font to use.
|
|
|
|
This method is meant to be called once only and only on the objects
|
|
created with the constructor overload not taking wxColour argument and
|
|
has the same effect as the other constructor, i.e. sets the font to
|
|
the given @a font and ensures that the old value is restored when this
|
|
object is destroyed.
|
|
*/
|
|
void Set(const wxFont& font);
|
|
|
|
/**
|
|
Restores the font originally selected in the DC passed to the ctor.
|
|
*/
|
|
~wxDCFontChanger();
|
|
};
|
|
|