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wxWidgets/interface/wx/graphics.h
Vadim Zeitlin 7ab7ff693b Add wxGraphicsRenderer::GetName() and GetVersion() methods. 
Allow the code to determine which underlying technology is used for
implementing wxGraphics API. This is needed by the unit tests to account for
the known differences between platforms and may be useful in other cases.

Closes #16154.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76380 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
2014-04-20 12:45:10 +00:00

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43 KiB
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/////////////////////////////////////////////////////////////////////////////
// Name: graphics.h
// Purpose: interface of various wxGraphics* classes
// Author: wxWidgets team
// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
/**
@class wxGraphicsPath
A wxGraphicsPath is a native representation of a geometric path. The
contents are specific and private to the respective renderer. Instances are
reference counted and can therefore be assigned as usual. The only way to
get a valid instance is by using wxGraphicsContext::CreatePath() or
wxGraphicsRenderer::CreatePath().
@library{wxcore}
@category{gdi}
*/
class wxGraphicsPath : public wxGraphicsObject
{
public:
/**
Adds an arc of a circle.
The circle is defined by the coordinates of its centre (@a x, @a y) or
@a c and its radius @a r. The arc goes from the starting angle @a
startAngle to @a endAngle either clockwise or counter-clockwise
depending on the value of @a clockwise argument.
The angles are measured in radians but, contrary to the usual
mathematical convention, are always @e clockwise from the horizontal
axis.
*/
//@{
virtual void AddArc(wxDouble x, wxDouble y, wxDouble r,
wxDouble startAngle, wxDouble endAngle,
bool clockwise);
void AddArc(const wxPoint2DDouble& c, wxDouble r,
wxDouble startAngle, wxDouble endAngle, bool clockwise);
//@}
/**
Appends a an arc to two tangents connecting (current) to (@a x1,@a y1)
and (@a x1,@a y1) to (@a x2,@a y2), also a straight line from (current)
to (@a x1,@a y1).
*/
virtual void AddArcToPoint(wxDouble x1, wxDouble y1, wxDouble x2,
wxDouble y2, wxDouble r);
/**
Appends a circle around (@a x,@a y) with radius @a r as a new closed
subpath.
*/
virtual void AddCircle(wxDouble x, wxDouble y, wxDouble r);
/**
Adds a cubic bezier curve from the current point, using two control
points and an end point.
*/
virtual void AddCurveToPoint(wxDouble cx1, wxDouble cy1,
wxDouble cx2, wxDouble cy2,
wxDouble x, wxDouble y);
/**
Adds a cubic bezier curve from the current point, using two control
points and an end point.
*/
void AddCurveToPoint(const wxPoint2DDouble& c1,
const wxPoint2DDouble& c2,
const wxPoint2DDouble& e);
/**
Appends an ellipse fitting into the passed in rectangle.
*/
virtual void AddEllipse(wxDouble x, wxDouble y, wxDouble w, wxDouble h);
/**
Adds a straight line from the current point to (@a x,@a y).
*/
virtual void AddLineToPoint(wxDouble x, wxDouble y);
/**
Adds a straight line from the current point to @a p.
*/
void AddLineToPoint(const wxPoint2DDouble& p);
/**
Adds another path.
*/
virtual void AddPath(const wxGraphicsPath& path);
/**
Adds a quadratic bezier curve from the current point, using a control
point and an end point.
*/
virtual void AddQuadCurveToPoint(wxDouble cx, wxDouble cy,
wxDouble x, wxDouble y);
/**
Appends a rectangle as a new closed subpath.
*/
virtual void AddRectangle(wxDouble x, wxDouble y, wxDouble w, wxDouble h);
/**
Appends a rounded rectangle as a new closed subpath.
*/
virtual void AddRoundedRectangle(wxDouble x, wxDouble y, wxDouble w,
wxDouble h, wxDouble radius);
/**
Closes the current sub-path.
*/
virtual void CloseSubpath();
/**
@return @true if the point is within the path.
*/
bool Contains(const wxPoint2DDouble& c,
wxPolygonFillMode fillStyle = wxODDEVEN_RULE) const;
/**
@return @true if the point is within the path.
*/
virtual bool Contains(wxDouble x, wxDouble y,
wxPolygonFillMode fillStyle = wxODDEVEN_RULE) const;
/**
Gets the bounding box enclosing all points (possibly including control
points).
*/
wxRect2DDouble GetBox() const;
/**
Gets the bounding box enclosing all points (possibly including control
points).
*/
virtual void GetBox(wxDouble* x, wxDouble* y,
wxDouble* w, wxDouble* h) const;
/**
Gets the last point of the current path, (0,0) if not yet set.
*/
virtual void GetCurrentPoint(wxDouble* x, wxDouble* y) const;
/**
Gets the last point of the current path, (0,0) if not yet set.
*/
wxPoint2DDouble GetCurrentPoint() const;
/**
Returns the native path (CGPathRef for Core Graphics, Path pointer for
GDIPlus and a cairo_path_t pointer for cairo).
*/
virtual void* GetNativePath() const;
/**
Begins a new subpath at (@a x,@a y).
*/
virtual void MoveToPoint(wxDouble x, wxDouble y);
/**
Begins a new subpath at @a p.
*/
void MoveToPoint(const wxPoint2DDouble& p);
/**
Transforms each point of this path by the matrix.
*/
virtual void Transform(const wxGraphicsMatrix& matrix);
/**
Gives back the native path returned by GetNativePath() because there
might be some deallocations necessary (e.g. on cairo the native path
returned by GetNativePath() is newly allocated each time).
*/
virtual void UnGetNativePath(void* p) const;
};
/**
@class wxGraphicsObject
This class is the superclass of native graphics objects like pens etc. It
allows reference counting. Not instantiated by user code.
@library{wxcore}
@category{gdi}
@see wxGraphicsBrush, wxGraphicsPen, wxGraphicsMatrix, wxGraphicsPath
*/
class wxGraphicsObject : public wxObject
{
public:
/**
Returns the renderer that was used to create this instance, or @NULL
if it has not been initialized yet.
*/
wxGraphicsRenderer* GetRenderer() const;
/**
@return @false if this object is valid, otherwise returns @true.
*/
bool IsNull() const;
};
/**
Anti-aliasing modes used by wxGraphicsContext::SetAntialiasMode().
*/
enum wxAntialiasMode
{
/** No anti-aliasing */
wxANTIALIAS_NONE,
/** The default anti-aliasing */
wxANTIALIAS_DEFAULT,
};
/**
Interpolation quality used by wxGraphicsContext::SetInterpolationQuality().
*/
enum wxInterpolationQuality
{
/** default interpolation, based on type of context, in general medium quality */
wxINTERPOLATION_DEFAULT,
/** no interpolation */
wxINTERPOLATION_NONE,
/** fast interpolation, suited for interactivity */
wxINTERPOLATION_FAST,
/** better quality */
wxINTERPOLATION_GOOD,
/** best quality, not suited for interactivity */
wxINTERPOLATION_BEST
};
/**
Compositing is done using Porter-Duff compositions
(see http://keithp.com/~keithp/porterduff/p253-porter.pdf) with
wxGraphicsContext::SetCompositionMode().
The description give a short equation on how the values of a resulting
pixel are calculated.
@e R = Result, @e S = Source, @e D = Destination, colors premultiplied with alpha
@e Ra, @e Sa, @e Da their alpha components
*/
enum wxCompositionMode
{
/**
Indicates invalid or unsupported composition mode.
This value can't be passed to wxGraphicsContext::SetCompositionMode().
@since 2.9.2
*/
wxCOMPOSITION_INVALID = -1,
wxCOMPOSITION_CLEAR, /**< @e R = 0 */
wxCOMPOSITION_SOURCE, /**< @e R = S */
wxCOMPOSITION_OVER, /**< @e R = @e S + @e D*(1 - @e Sa) */
wxCOMPOSITION_IN, /**< @e R = @e S*@e Da */
wxCOMPOSITION_OUT, /**< @e R = @e S*(1 - @e Da) */
wxCOMPOSITION_ATOP, /**< @e R = @e S*@e Da + @e D*(1 - @e Sa) */
wxCOMPOSITION_DEST, /**< @e R = @e D, essentially a noop */
wxCOMPOSITION_DEST_OVER, /**< @e R = @e S*(1 - @e Da) + @e D */
wxCOMPOSITION_DEST_IN, /**< @e R = @e D*@e Sa */
wxCOMPOSITION_DEST_OUT, /**< @e R = @e D*(1 - @e Sa) */
wxCOMPOSITION_DEST_ATOP, /**< @e R = @e S*(1 - @e Da) + @e D*@e Sa */
wxCOMPOSITION_XOR, /**< @e R = @e S*(1 - @e Da) + @e D*(1 - @e Sa) */
wxCOMPOSITION_ADD /**< @e R = @e S + @e D */
};
/**
Represents a bitmap.
The objects of this class are not created directly but only via
wxGraphicsContext or wxGraphicsRenderer CreateBitmap(),
CreateBitmapFromImage() or CreateSubBitmap() methods. They can subsequently
be used with wxGraphicsContext::DrawBitmap(). The only other operation is
testing for the bitmap validity which can be performed using IsNull()
method inherited from the base class.
*/
class wxGraphicsBitmap : public wxGraphicsObject
{
public:
/**
Default constructor creates an invalid bitmap.
*/
wxGraphicsBitmap() {}
/**
Return the contents of this bitmap as wxImage.
Using this method is more efficient than converting wxGraphicsBitmap to
wxBitmap first and then to wxImage and can be useful if, for example,
you want to save wxGraphicsBitmap as a disk file in a format not
directly supported by wxBitmap.
Invalid image is returned if the bitmap is invalid.
@since 2.9.3
*/
wxImage ConvertToImage() const;
/**
Return the pointer to the native bitmap data. (CGImageRef for Core Graphics,
cairo_surface_t for Cairo, Bitmap* for GDI+.)
@since 2.9.4
*/
void* GetNativeBitmap() const;
};
/**
@class wxGraphicsContext
A wxGraphicsContext instance is the object that is drawn upon. It is
created by a renderer using wxGraphicsRenderer::CreateContext(). This can
be either directly using a renderer instance, or indirectly using the
static convenience Create() functions of wxGraphicsContext that always
delegate the task to the default renderer.
@code
void MyCanvas::OnPaint(wxPaintEvent &event)
{
// Create paint DC
wxPaintDC dc(this);
// Create graphics context from it
wxGraphicsContext *gc = wxGraphicsContext::Create( dc );
if (gc)
{
// make a path that contains a circle and some lines
gc->SetPen( *wxRED_PEN );
wxGraphicsPath path = gc->CreatePath();
path.AddCircle( 50.0, 50.0, 50.0 );
path.MoveToPoint(0.0, 50.0);
path.AddLineToPoint(100.0, 50.0);
path.MoveToPoint(50.0, 0.0);
path.AddLineToPoint(50.0, 100.0 );
path.CloseSubpath();
path.AddRectangle(25.0, 25.0, 50.0, 50.0);
gc->StrokePath(path);
delete gc;
}
}
@endcode
@library{wxcore}
@category{gdi,dc}
@see wxGraphicsRenderer::CreateContext(), wxGCDC, wxDC
*/
class wxGraphicsContext : public wxGraphicsObject
{
public:
/**
Creates a wxGraphicsContext from a wxWindow.
@see wxGraphicsRenderer::CreateContext()
*/
static wxGraphicsContext* Create(wxWindow* window);
/**
Creates a wxGraphicsContext from a wxWindowDC
@see wxGraphicsRenderer::CreateContext()
*/
static wxGraphicsContext* Create(const wxWindowDC& windowDC);
/**
Creates a wxGraphicsContext from a wxMemoryDC
@see wxGraphicsRenderer::CreateContext()
*/
static wxGraphicsContext* Create(const wxMemoryDC& memoryDC);
/**
Creates a wxGraphicsContext from a wxPrinterDC. Under GTK+, this will
only work when using the GtkPrint printing backend which is available
since GTK+ 2.10.
@see wxGraphicsRenderer::CreateContext(), @ref overview_unixprinting
*/
static wxGraphicsContext* Create(const wxPrinterDC& printerDC);
/**
Creates a wxGraphicsContext from a wxEnhMetaFileDC.
This function, as wxEnhMetaFileDC class itself, is only available only
under MSW.
@see wxGraphicsRenderer::CreateContext()
*/
static wxGraphicsContext* Create(const wxEnhMetaFileDC& metaFileDC);
/**
Creates a wxGraphicsContext associated with a wxImage.
The image specifies the size of the context as well as whether alpha is
supported (if wxImage::HasAlpha()) or not and the initial contents of
the context. The @a image object must have a life time greater than
that of the new context as the context copies its contents back to the
image when it is destroyed.
@since 2.9.3
*/
static wxGraphicsContext* Create(wxImage& image);
/**
Create a lightweight context that can be used only for measuring text.
*/
static wxGraphicsContext* Create();
/**
Clips drawings to the specified region.
*/
virtual void Clip(const wxRegion& region) = 0;
/**
Clips drawings to the specified rectangle.
*/
virtual void Clip(wxDouble x, wxDouble y, wxDouble w, wxDouble h) = 0;
/**
Concatenates the passed in transform with the current transform of this
context.
*/
virtual void ConcatTransform(const wxGraphicsMatrix& matrix) = 0;
/**
Creates wxGraphicsBitmap from an existing wxBitmap.
Returns an invalid wxNullGraphicsBitmap on failure.
*/
virtual wxGraphicsBitmap CreateBitmap( const wxBitmap &bitmap ) = 0;
/**
Creates wxGraphicsBitmap from an existing wxImage.
This method is more efficient than converting wxImage to wxBitmap first
and then calling CreateBitmap() but otherwise has the same effect.
Returns an invalid wxNullGraphicsBitmap on failure.
@since 2.9.3
*/
virtual wxGraphicsBitmap CreateBitmapFromImage(const wxImage& image);
/**
Extracts a sub-bitmap from an existing bitmap.
Currently this function is implemented in the native MSW and OS X
versions but not when using Cairo.
*/
virtual wxGraphicsBitmap CreateSubBitmap(const wxGraphicsBitmap& bitmap,
wxDouble x, wxDouble y,
wxDouble w, wxDouble h) = 0;
/**
Creates a native brush from a wxBrush.
*/
virtual wxGraphicsBrush CreateBrush(const wxBrush& brush) const;
/**
Creates a native graphics font from a wxFont and a text colour.
*/
virtual wxGraphicsFont CreateFont(const wxFont& font,
const wxColour& col = *wxBLACK) const;
/**
Creates a font object with the specified attributes.
The use of overload taking wxFont is preferred, see
wxGraphicsRenderer::CreateFont() for more details.
@since 2.9.3
*/
virtual wxGraphicsFont CreateFont(double sizeInPixels,
const wxString& facename,
int flags = wxFONTFLAG_DEFAULT,
const wxColour& col = *wxBLACK) const;
/**
Creates a wxGraphicsContext from a native context. This native context
must be a CGContextRef for Core Graphics, a Graphics pointer for
GDIPlus, or a cairo_t pointer for cairo.
@see wxGraphicsRenderer::CreateContextFromNativeContext()
*/
static wxGraphicsContext* CreateFromNative(void* context);
/**
Creates a wxGraphicsContext from a native window.
@see wxGraphicsRenderer::CreateContextFromNativeWindow()
*/
static wxGraphicsContext* CreateFromNativeWindow(void* window);
/**
Creates a native brush with a linear gradient.
The brush starts at (@a x1, @a y1) and ends at (@a x2, @a y2). Either
just the start and end gradient colours (@a c1 and @a c2) or full set
of gradient @a stops can be specified.
The version taking wxGraphicsGradientStops is new in wxWidgets 2.9.1.
*/
//@{
wxGraphicsBrush
CreateLinearGradientBrush(wxDouble x1, wxDouble y1,
wxDouble x2, wxDouble y2,
const wxColour& c1, const wxColour& c2) const;
wxGraphicsBrush
CreateLinearGradientBrush(wxDouble x1, wxDouble y1,
wxDouble x2, wxDouble y2,
const wxGraphicsGradientStops& stops) const;
//@}
/**
Creates a native affine transformation matrix from the passed in
values. The default parameters result in an identity matrix.
*/
virtual wxGraphicsMatrix CreateMatrix(wxDouble a = 1.0, wxDouble b = 0.0,
wxDouble c = 0.0, wxDouble d = 1.0,
wxDouble tx = 0.0,
wxDouble ty = 0.0) const;
/**
Creates a native affine transformation matrix from the passed
generic one.
@since 2.9.4
*/
wxGraphicsMatrix CreateMatrix(const wxAffineMatrix2DBase& mat) const;
/**
Creates a native graphics path which is initially empty.
*/
wxGraphicsPath CreatePath() const;
/**
Creates a native pen from a wxPen.
*/
virtual wxGraphicsPen CreatePen(const wxPen& pen) const;
/**
Creates a native brush with a radial gradient.
The brush originates at (@a xo, @a yc) and ends on a circle around
(@a xc, @a yc) with the given @a radius.
The gradient may be specified either by its start and end colours @a
oColor and @a cColor or by a full set of gradient @a stops.
The version taking wxGraphicsGradientStops is new in wxWidgets 2.9.1.
*/
//@{
virtual wxGraphicsBrush
CreateRadialGradientBrush(wxDouble xo, wxDouble yo,
wxDouble xc, wxDouble yc,
wxDouble radius,
const wxColour& oColor,
const wxColour& cColor) const;
virtual wxGraphicsBrush
CreateRadialGradientBrush(wxDouble xo, wxDouble yo,
wxDouble xc, wxDouble yc,
wxDouble radius,
const wxGraphicsGradientStops& stops) = 0;
//@}
/**
Draws the bitmap. In case of a mono bitmap, this is treated as a mask
and the current brushed is used for filling.
*/
//@{
virtual void DrawBitmap(const wxGraphicsBitmap& bmp,
wxDouble x, wxDouble y,
wxDouble w, wxDouble h ) = 0;
virtual void DrawBitmap(const wxBitmap& bmp,
wxDouble x, wxDouble y,
wxDouble w, wxDouble h) = 0;
//@}
/**
Draws an ellipse.
*/
virtual void DrawEllipse(wxDouble x, wxDouble y, wxDouble w, wxDouble h);
/**
Draws the icon.
*/
virtual void DrawIcon(const wxIcon& icon, wxDouble x, wxDouble y,
wxDouble w, wxDouble h) = 0;
/**
Draws a polygon.
*/
virtual void DrawLines(size_t n, const wxPoint2DDouble* points,
wxPolygonFillMode fillStyle = wxODDEVEN_RULE);
/**
Draws the path by first filling and then stroking.
*/
virtual void DrawPath(const wxGraphicsPath& path,
wxPolygonFillMode fillStyle = wxODDEVEN_RULE);
/**
Draws a rectangle.
*/
virtual void DrawRectangle(wxDouble x, wxDouble y, wxDouble w, wxDouble h);
/**
Draws a rounded rectangle.
*/
virtual void DrawRoundedRectangle(wxDouble x, wxDouble y, wxDouble w,
wxDouble h, wxDouble radius);
/**
Draws text at the defined position.
*/
void DrawText(const wxString& str, wxDouble x, wxDouble y);
/**
Draws text at the defined position.
@param str
The text to draw.
@param x
The x coordinate position to draw the text at.
@param y
The y coordinate position to draw the text at.
@param angle
The angle relative to the (default) horizontal direction to draw
the string.
*/
void DrawText(const wxString& str, wxDouble x, wxDouble y, wxDouble angle);
/**
Draws text at the defined position.
@param str
The text to draw.
@param x
The x coordinate position to draw the text at.
@param y
The y coordinate position to draw the text at.
@param backgroundBrush
Brush to fill the text with.
*/
void DrawText(const wxString& str, wxDouble x, wxDouble y,
const wxGraphicsBrush& backgroundBrush);
/**
Draws text at the defined position.
@param str
The text to draw.
@param x
The x coordinate position to draw the text at.
@param y
The y coordinate position to draw the text at.
@param angle
The angle relative to the (default) horizontal direction to draw
the string.
@param backgroundBrush
Brush to fill the text with.
*/
void DrawText(const wxString& str, wxDouble x, wxDouble y,
wxDouble angle, const wxGraphicsBrush& backgroundBrush);
/**
Fills the path with the current brush.
*/
virtual void FillPath(const wxGraphicsPath& path,
wxPolygonFillMode fillStyle = wxODDEVEN_RULE) = 0;
/**
Returns the native context (CGContextRef for Core Graphics, Graphics
pointer for GDIPlus and cairo_t pointer for cairo).
*/
virtual void* GetNativeContext() = 0;
/**
Fills the @a widths array with the widths from the beginning of
@a text to the corresponding character of @a text.
*/
virtual void GetPartialTextExtents(const wxString& text,
wxArrayDouble& widths) const = 0;
/**
Gets the dimensions of the string using the currently selected font.
@param text
The text string to measure.
@param width
Variable to store the total calculated width of the text.
@param height
Variable to store the total calculated height of the text.
@param descent
Variable to store the dimension from the baseline of the font to
the bottom of the descender.
@param externalLeading
Any extra vertical space added to the font by the font designer
(usually is zero).
*/
virtual void GetTextExtent(const wxString& text, wxDouble* width,
wxDouble* height, wxDouble* descent,
wxDouble* externalLeading) const = 0;
/**
Gets the current transformation matrix of this context.
*/
virtual wxGraphicsMatrix GetTransform() const = 0;
/**
Resets the clipping to original shape.
*/
virtual void ResetClip() = 0;
/**
Rotates the current transformation matrix (in radians).
*/
virtual void Rotate(wxDouble angle) = 0;
/**
Scales the current transformation matrix.
*/
virtual void Scale(wxDouble xScale, wxDouble yScale) = 0;
/**
Sets the brush for filling paths.
*/
void SetBrush(const wxBrush& brush);
/**
Sets the brush for filling paths.
*/
virtual void SetBrush(const wxGraphicsBrush& brush);
/**
Sets the font for drawing text.
*/
void SetFont(const wxFont& font, const wxColour& colour);
/**
Sets the font for drawing text.
*/
virtual void SetFont(const wxGraphicsFont& font);
/**
Sets the pen used for stroking.
*/
void SetPen(const wxPen& pen);
/**
Sets the pen used for stroking.
*/
virtual void SetPen(const wxGraphicsPen& pen);
/**
Sets the current transformation matrix of this context
*/
virtual void SetTransform(const wxGraphicsMatrix& matrix) = 0;
/**
Strokes a single line.
*/
virtual void StrokeLine(wxDouble x1, wxDouble y1, wxDouble x2, wxDouble y2);
/**
Stroke disconnected lines from begin to end points, fastest method
available for this purpose.
*/
virtual void StrokeLines(size_t n, const wxPoint2DDouble* beginPoints,
const wxPoint2DDouble* endPoints);
/**
Stroke lines connecting all the points.
Unlike the other overload of this function, this method draws a single
polyline and not a number of disconnected lines.
*/
virtual void StrokeLines(size_t n, const wxPoint2DDouble* points);
/**
Strokes along a path with the current pen.
*/
virtual void StrokePath(const wxGraphicsPath& path) = 0;
/**
Translates the current transformation matrix.
*/
virtual void Translate(wxDouble dx, wxDouble dy) = 0;
/**
Redirects all rendering is done into a fully transparent temporary context
*/
virtual void BeginLayer(wxDouble opacity) = 0;
/**
Composites back the drawings into the context with the opacity given at
the BeginLayer call
*/
virtual void EndLayer() = 0;
/**
Sets the antialiasing mode, returns true if it supported
*/
virtual bool SetAntialiasMode(wxAntialiasMode antialias) = 0;
/**
Returns the current shape antialiasing mode
*/
virtual wxAntialiasMode GetAntialiasMode() const ;
/**
Sets the interpolation quality, returns true if it is supported.
Not implemented in Cairo backend currently.
*/
virtual bool SetInterpolationQuality(wxInterpolationQuality interpolation) = 0;
/**
Returns the current interpolation quality.
*/
virtual wxInterpolationQuality GetInterpolationQuality() const;
/**
Sets the compositing operator, returns true if it supported
*/
virtual bool SetCompositionMode(wxCompositionMode op) = 0;
/**
Returns the current compositing operator
*/
virtual wxCompositionMode GetCompositionMode() const;
/**
Push the current state of the context's transformation matrix on a
stack.
@see wxGraphicsContext::PopState
*/
virtual void PushState() = 0;
/**
Pops a stored state from the stack and sets the current transformation
matrix to that state.
@see wxGraphicsContext::PopState
*/
virtual void PopState() = 0;
virtual bool ShouldOffset() const;
virtual void EnableOffset(bool enable = true);
void DisableOffset();
bool OffsetEnabled();
/**
Begin a new document (relevant only for printing / pdf etc.)
If there is a progress dialog, message will be shown.
*/
virtual bool StartDoc( const wxString& message );
/**
Done with that document (relevant only for printing / pdf etc.)
*/
virtual void EndDoc();
/**
Opens a new page (relevant only for printing / pdf etc.) with the given
size in points. (If both are null the default page size will be used.)
*/
virtual void StartPage( wxDouble width = 0, wxDouble height = 0 );
/**
Ends the current page (relevant only for printing / pdf etc.)
*/
virtual void EndPage();
/**
Make sure that the current content of this context is immediately visible.
*/
virtual void Flush();
/**
Returns the size of the graphics context in device coordinates.
*/
void GetSize(wxDouble* width, wxDouble* height) const;
/**
Returns the resolution of the graphics context in device points per inch.
*/
virtual void GetDPI( wxDouble* dpiX, wxDouble* dpiY);
};
/**
Represents a single gradient stop in a collection of gradient stops as
represented by wxGraphicsGradientStops.
@library{wxcore}
@category{gdi}
@since 2.9.1
*/
class wxGraphicsGradientStop
{
public:
/**
Creates a stop with the given colour and position.
@param col The colour of this stop. Note that the alpha component of
the colour is honoured thus allowing the background colours to
partially show through the gradient.
@param pos The stop position, must be in [0, 1] range with 0 being the
beginning and 1 the end of the gradient.
*/
wxGraphicsGradientStop(wxColour col = wxTransparentColour, float pos = 0.);
/// Return the stop colour.
const wxColour& GetColour() const;
/**
Change the stop colour.
@param col The new colour.
*/
void SetColour(const wxColour& col);
/// Return the stop position.
float GetPosition() const;
/**
Change the stop position.
@param pos The new position, must always be in [0, 1] range.
*/
void SetPosition(float pos);
};
/**
Represents a collection of wxGraphicGradientStop values for use with
CreateLinearGradientBrush and CreateRadialGradientBrush.
The stops are maintained in order of position. If two or more stops are
added with the same position then the one(s) added later come later.
This can be useful for producing discontinuities in the colour gradient.
Notice that this class is write-once, you can't modify the stops once they
had been added.
@library{wxcore}
@category{gdi}
@since 2.9.1
*/
class wxGraphicsGradientStops
{
public:
/**
Initializes the gradient stops with the given boundary colours.
Creates a wxGraphicsGradientStops instance with start colour given
by @a startCol and end colour given by @a endCol.
*/
wxGraphicsGradientStops(wxColour startCol = wxTransparentColour,
wxColour endCol = wxTransparentColour);
/**
Add a new stop.
*/
//@{
void Add(const wxGraphicsGradientStop& stop);
void Add(wxColour col, float pos);
//@}
/**
Returns the stop at the given index.
@param n The index, must be in [0, GetCount()) range.
*/
wxGraphicsGradientStop Item(unsigned n) const;
/**
Returns the number of stops.
*/
size_t GetCount() const;
/**
Set the start colour to @a col
*/
void SetStartColour(wxColour col);
/**
Returns the start colour.
*/
wxColour GetStartColour() const;
/**
Set the end colour to @a col
*/
void SetEndColour(wxColour col);
/**
Returns the end colour.
*/
wxColour GetEndColour() const;
};
/**
@class wxGraphicsRenderer
A wxGraphicsRenderer is the instance corresponding to the rendering engine
used. There may be multiple instances on a system, if there are different
rendering engines present, but there is always only one instance per
engine. This instance is pointed back to by all objects created by it
(wxGraphicsContext, wxGraphicsPath etc) and can be retrieved through their
wxGraphicsObject::GetRenderer() method. Therefore you can create an
additional instance of a path etc. by calling
wxGraphicsObject::GetRenderer() and then using the appropriate CreateXXX()
function of that renderer.
@code
wxGraphicsPath *path = // from somewhere
wxGraphicsBrush *brush = path->GetRenderer()->CreateBrush( *wxBLACK_BRUSH );
@endcode
@library{wxcore}
@category{gdi}
*/
class wxGraphicsRenderer : public wxObject
{
public:
/**
Creates wxGraphicsBitmap from an existing wxBitmap.
Returns an invalid wxNullGraphicsBitmap on failure.
*/
virtual wxGraphicsBitmap CreateBitmap( const wxBitmap &bitmap ) = 0;
/**
Creates wxGraphicsBitmap from an existing wxImage.
This method is more efficient than converting wxImage to wxBitmap first
and then calling CreateBitmap() but otherwise has the same effect.
Returns an invalid wxNullGraphicsBitmap on failure.
@since 2.9.3
*/
virtual wxGraphicsBitmap CreateBitmapFromImage(const wxImage& image) = 0;
/**
Creates a wxImage from a wxGraphicsBitmap.
This method is used by the more convenient wxGraphicsBitmap::ConvertToImage.
*/
virtual wxImage CreateImageFromBitmap(const wxGraphicsBitmap& bmp) = 0;
/**
Creates wxGraphicsBitmap from a native bitmap handle.
@a bitmap meaning is platform-dependent. Currently it's a GDI+ @c
Bitmap pointer under MSW, @c CGImage pointer under OS X or a @c
cairo_surface_t pointer when using Cairo under any platform.
*/
virtual wxGraphicsBitmap CreateBitmapFromNativeBitmap( void* bitmap ) = 0;
/**
Creates a wxGraphicsContext from a wxWindow.
*/
virtual wxGraphicsContext* CreateContext(wxWindow* window) = 0;
/**
Creates a wxGraphicsContext from a wxWindowDC
*/
virtual wxGraphicsContext* CreateContext(const wxWindowDC& windowDC) = 0 ;
/**
Creates a wxGraphicsContext from a wxMemoryDC
*/
virtual wxGraphicsContext* CreateContext(const wxMemoryDC& memoryDC) = 0 ;
/**
Creates a wxGraphicsContext from a wxPrinterDC
*/
virtual wxGraphicsContext* CreateContext(const wxPrinterDC& printerDC) = 0 ;
/**
Creates a wxGraphicsContext from a wxEnhMetaFileDC.
This function, as wxEnhMetaFileDC class itself, is only available only
under MSW.
*/
virtual wxGraphicsContext* CreateContext(const wxEnhMetaFileDC& metaFileDC) = 0;
/**
Creates a wxGraphicsContext associated with a wxImage.
This function is used by wxContext::CreateFromImage() and is not
normally called directly.
@since 2.9.3
*/
wxGraphicsContext* CreateContextFromImage(wxImage& image);
/**
Creates a native brush from a wxBrush.
*/
virtual wxGraphicsBrush CreateBrush(const wxBrush& brush) = 0;
/**
Creates a wxGraphicsContext from a native context. This native context
must be a CGContextRef for Core Graphics, a Graphics pointer for
GDIPlus, or a cairo_t pointer for cairo.
*/
virtual wxGraphicsContext* CreateContextFromNativeContext(void* context) = 0;
/**
Creates a wxGraphicsContext from a native window.
*/
virtual wxGraphicsContext* CreateContextFromNativeWindow(void* window) = 0;
/**
Creates a wxGraphicsContext that can be used for measuring texts only.
No drawing commands are allowed.
*/
virtual wxGraphicsContext * CreateMeasuringContext() = 0;
/**
Creates a native graphics font from a wxFont and a text colour.
*/
virtual wxGraphicsFont CreateFont(const wxFont& font,
const wxColour& col = *wxBLACK) = 0;
/**
Creates a graphics font with the given characteristics.
If possible, the CreateFont() overload taking wxFont should be used
instead. The main advantage of this overload is that it can be used
without X server connection under Unix when using Cairo.
@param sizeInPixels
Height of the font in user space units, i.e. normally pixels.
Notice that this is different from the overload taking wxFont as
wxFont size is specified in points.
@param facename
The name of the font. The same font name might not be available
under all platforms so the font name can also be empty to use the
default platform font.
@param flags
Combination of wxFontFlag enum elements. Currently only
@c wxFONTFLAG_ITALIC and @c wxFONTFLAG_BOLD are supported. By
default the normal font version is used.
@param col
The font colour, black by default.
@since 2.9.3
*/
virtual wxGraphicsFont CreateFont(double sizeInPixels,
const wxString& facename,
int flags = wxFONTFLAG_DEFAULT,
const wxColour& col = *wxBLACK) = 0;
/**
Creates a native brush with a linear gradient.
Stops support is new since wxWidgets 2.9.1, previously only the start
and end colours could be specified.
*/
virtual wxGraphicsBrush CreateLinearGradientBrush(wxDouble x1,
wxDouble y1,
wxDouble x2,
wxDouble y2,
const wxGraphicsGradientStops& stops) = 0;
/**
Creates a native affine transformation matrix from the passed in
values. The defaults result in an identity matrix.
*/
virtual wxGraphicsMatrix CreateMatrix(wxDouble a = 1.0, wxDouble b = 0.0,
wxDouble c = 0.0, wxDouble d = 1.0,
wxDouble tx = 0.0,
wxDouble ty = 0.0) = 0;
/**
Creates a native graphics path which is initially empty.
*/
virtual wxGraphicsPath CreatePath() = 0;
/**
Creates a native pen from a wxPen.
*/
virtual wxGraphicsPen CreatePen(const wxPen& pen) = 0;
/**
Creates a native brush with a radial gradient.
Stops support is new since wxWidgets 2.9.1, previously only the start
and end colours could be specified.
*/
virtual wxGraphicsBrush CreateRadialGradientBrush(wxDouble xo, wxDouble yo,
wxDouble xc, wxDouble yc,
wxDouble radius,
const wxGraphicsGradientStops& stops) = 0;
/**
Extracts a sub-bitmap from an existing bitmap.
Currently this function is implemented in the native MSW and OS X
versions but not when using Cairo.
*/
virtual wxGraphicsBitmap CreateSubBitmap(const wxGraphicsBitmap& bitmap,
wxDouble x, wxDouble y,
wxDouble w, wxDouble h) = 0;
/**
Returns the name of the technology used by the renderer.
Currently this function returns "gdiplus" for Windows GDI+ implementation,
"cairo" for Cairo implementation and "cg" for OS X CoreGraphics
implementation.
Note: the string returned by this method is not user-readable and is
expected to be used internally by the program only.
@since 3.1.0
*/
virtual wxString GetName() const = 0;
/**
Returns the version major, minor and micro/build of the technology used
by the renderer.
Currently this function returns the OS major and minor versions in
the parameters with the matching names and sets @a micro to 0 for
the GDI+ and CoreGraphics engines which are considered to be parts of
their respective OS.
For Cairo, this is the major,minor,micro version of the Cairo library
which is returned.
*/
virtual void GetVersion(int* major, int* minor = NULL, int* micro=NULL) const = 0;
/**
Returns the default renderer on this platform. On OS X this is the Core
Graphics (a.k.a. Quartz 2D) renderer, on MSW the GDIPlus renderer, and
on GTK we currently default to the cairo renderer.
*/
static wxGraphicsRenderer* GetDefaultRenderer();
static wxGraphicsRenderer* GetCairoRenderer();
};
/**
@class wxGraphicsBrush
A wxGraphicsBrush is a native representation of a brush. The contents are
specific and private to the respective renderer. Instances are ref counted
and can therefore be assigned as usual. The only way to get a valid
instance is via wxGraphicsContext::CreateBrush() or
wxGraphicsRenderer::CreateBrush().
@library{wxcore}
@category{gdi}
*/
class wxGraphicsBrush : public wxGraphicsObject
{
public:
};
/**
@class wxGraphicsFont
A wxGraphicsFont is a native representation of a font. The contents are
specific and private to the respective renderer. Instances are ref counted
and can therefore be assigned as usual. The only way to get a valid
instance is via wxGraphicsContext::CreateFont() or
wxGraphicsRenderer::CreateFont().
@library{wxcore}
@category{gdi}
*/
class wxGraphicsFont : public wxGraphicsObject
{
public:
};
/**
@class wxGraphicsPen
A wxGraphicsPen is a native representation of a pen. The contents are
specific and private to the respective renderer. Instances are ref counted
and can therefore be assigned as usual. The only way to get a valid
instance is via wxGraphicsContext::CreatePen() or
wxGraphicsRenderer::CreatePen().
@library{wxcore}
@category{gdi}
*/
class wxGraphicsPen : public wxGraphicsObject
{
public:
};
/**
@class wxGraphicsMatrix
A wxGraphicsMatrix is a native representation of an affine matrix. The
contents are specific and private to the respective renderer. Instances are
ref counted and can therefore be assigned as usual. The only way to get a
valid instance is via wxGraphicsContext::CreateMatrix() or
wxGraphicsRenderer::CreateMatrix().
@library{wxcore}
@category{gdi}
*/
class wxGraphicsMatrix : public wxGraphicsObject
{
public:
/**
Concatenates the matrix passed with the current matrix.
*/
virtual void Concat(const wxGraphicsMatrix* t);
/**
Concatenates the matrix passed with the current matrix.
*/
void Concat(const wxGraphicsMatrix& t);
/**
Returns the component values of the matrix via the argument pointers.
*/
virtual void Get(wxDouble* a = NULL, wxDouble* b = NULL,
wxDouble* c = NULL, wxDouble* d = NULL,
wxDouble* tx = NULL, wxDouble* ty = NULL) const;
/**
Returns the native representation of the matrix. For CoreGraphics this
is a CFAffineMatrix pointer, for GDIPlus a Matrix Pointer, and for
Cairo a cairo_matrix_t pointer.
*/
virtual void* GetNativeMatrix() const;
/**
Inverts the matrix.
*/
virtual void Invert();
/**
Returns @true if the elements of the transformation matrix are equal.
*/
virtual bool IsEqual(const wxGraphicsMatrix* t) const;
/**
Returns @true if the elements of the transformation matrix are equal.
*/
bool IsEqual(const wxGraphicsMatrix& t) const;
/**
Return @true if this is the identity matrix.
*/
virtual bool IsIdentity() const;
/**
Rotates this matrix clockwise (in radians).
@param angle
Rotation angle in radians, clockwise.
*/
virtual void Rotate(wxDouble angle);
/**
Scales this matrix.
*/
virtual void Scale(wxDouble xScale, wxDouble yScale);
/**
Sets the matrix to the respective values (default values are the
identity matrix).
*/
virtual void Set(wxDouble a = 1.0, wxDouble b = 0.0, wxDouble c = 0.0,
wxDouble d = 1.0, wxDouble tx = 0.0, wxDouble ty = 0.0);
/**
Applies this matrix to a distance (ie. performs all transforms except
translations).
*/
virtual void TransformDistance(wxDouble* dx, wxDouble* dy) const;
/**
Applies this matrix to a point.
*/
virtual void TransformPoint(wxDouble* x, wxDouble* y) const;
/**
Translates this matrix.
*/
virtual void Translate(wxDouble dx, wxDouble dy);
};
const wxGraphicsPen wxNullGraphicsPen;
const wxGraphicsBrush wxNullGraphicsBrush;
const wxGraphicsFont wxNullGraphicsFont;
const wxGraphicsBitmap wxNullGraphicsBitmap;
const wxGraphicsMatrix wxNullGraphicsMatrix;
const wxGraphicsPath wxNullGraphicsPath;
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