2005-10-04 14:14:41 -04:00
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%% Name: brush.tex
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%% Purpose: wxPen docs
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%% Author:
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%% Modified by:
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%% Created:
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%% RCS-ID: $Id$
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%% Copyright: (c) wxWidgets
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%% License: wxWindows license
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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1998-05-20 10:25:30 -04:00
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\section{\class{wxBrush}}\label{wxbrush}
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A brush is a drawing tool for filling in areas. It is used for painting
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the background of rectangles, ellipses, etc. It has a colour and a
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style.
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\wxheading{Derived from}
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\helpref{wxGDIObject}{wxgdiobject}\\
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\helpref{wxObject}{wxobject}
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1999-02-15 15:41:29 -05:00
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\wxheading{Include files}
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<wx/brush.h>
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1999-03-01 08:06:15 -05:00
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\wxheading{Predefined objects}
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Objects:
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{\bf wxNullBrush}
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Pointers:
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{\bf wxBLUE\_BRUSH\\
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wxGREEN\_BRUSH\\
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wxWHITE\_BRUSH\\
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wxBLACK\_BRUSH\\
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wxGREY\_BRUSH\\
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wxMEDIUM\_GREY\_BRUSH\\
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wxLIGHT\_GREY\_BRUSH\\
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wxTRANSPARENT\_BRUSH\\
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wxCYAN\_BRUSH\\
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wxRED\_BRUSH}
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1998-05-20 10:25:30 -04:00
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\wxheading{Remarks}
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2004-05-04 04:27:20 -04:00
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On a monochrome display, wxWidgets shows
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1998-05-20 10:25:30 -04:00
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all brushes as white unless the colour is really black.
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Do not initialize objects on the stack before the program commences,
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since other required structures may not have been set up yet. Instead,
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define global pointers to objects and create them in \helpref{wxApp::OnInit}{wxapponinit} or
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when required.
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An application may wish to create brushes with different
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characteristics dynamically, and there is the consequent danger that a
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large number of duplicate brushes will be created. Therefore an
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application may wish to get a pointer to a brush by using the global
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list of brushes {\bf wxTheBrushList}, and calling the member function
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\rtfsp{\bf FindOrCreateBrush}.
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2006-11-21 04:27:10 -05:00
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This class uses \helpref{reference counting and copy-on-write}{trefcount}
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internally so that assignments between two instances of this class are very
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cheap. You can therefore use actual objects instead of pointers without
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efficiency problems. If an instance of this class is changed it will create
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its own data internally so that other instances, which previously shared the
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data using the reference counting, are not affected.
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1999-02-09 16:22:58 -05:00
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%TODO: an overview for wxBrush.
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\wxheading{See also}
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\helpref{wxBrushList}{wxbrushlist}, \helpref{wxDC}{wxdc}, \helpref{wxDC::SetBrush}{wxdcsetbrush}
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\latexignore{\rtfignore{\wxheading{Members}}}
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2005-04-01 20:00:09 -05:00
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2004-10-04 11:13:52 -04:00
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\membersection{wxBrush::wxBrush}\label{wxbrushctor}
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\func{}{wxBrush}{\void}
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Default constructor. The brush will be uninitialised, and \helpref{wxBrush:IsOk}{wxbrushisok} will
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return false.
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2003-07-21 16:48:08 -04:00
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\func{}{wxBrush}{\param{const wxColour\&}{ colour}, \param{int}{ style = {\tt wxSOLID}}}
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Constructs a brush from a colour object and style.
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1998-06-14 08:11:50 -04:00
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\func{}{wxBrush}{\param{const wxString\& }{colourName}, \param{int}{ style}}
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Constructs a brush from a colour name and style.
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\func{}{wxBrush}{\param{const wxBitmap\& }{stippleBitmap}}
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Constructs a stippled brush using a bitmap.
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\func{}{wxBrush}{\param{const wxBrush\&}{ brush}}
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2006-10-18 13:23:42 -04:00
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Copy constructor, uses \helpref{reference counting}{trefcount}.
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\wxheading{Parameters}
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\docparam{colour}{Colour object.}
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\docparam{colourName}{Colour name. The name will be looked up in the colour database.}
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\docparam{style}{One of:
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\begin{twocollist}\itemsep=0pt
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\twocolitem{{\bf wxTRANSPARENT}}{Transparent (no fill).}
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\twocolitem{{\bf wxSOLID}}{Solid.}
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\twocolitem{{\bf wxSTIPPLE}}{Uses a bitmap as a stipple.}
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\twocolitem{{\bf wxBDIAGONAL\_HATCH}}{Backward diagonal hatch.}
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\twocolitem{{\bf wxCROSSDIAG\_HATCH}}{Cross-diagonal hatch.}
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\twocolitem{{\bf wxFDIAGONAL\_HATCH}}{Forward diagonal hatch.}
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\twocolitem{{\bf wxCROSS\_HATCH}}{Cross hatch.}
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\twocolitem{{\bf wxHORIZONTAL\_HATCH}}{Horizontal hatch.}
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\twocolitem{{\bf wxVERTICAL\_HATCH}}{Vertical hatch.}
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\end{twocollist}}
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\docparam{brush}{Pointer or reference to a brush to copy.}
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\docparam{stippleBitmap}{A bitmap to use for stippling.}
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\wxheading{Remarks}
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If a stipple brush is created, the brush style will be set to wxSTIPPLE.
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\wxheading{See also}
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\helpref{wxBrushList}{wxbrushlist}, \helpref{wxColour}{wxcolour}, \helpref{wxColourDatabase}{wxcolourdatabase}
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2005-04-01 20:00:09 -05:00
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2004-10-04 11:13:52 -04:00
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\membersection{wxBrush::\destruct{wxBrush}}\label{wxbrushdtor}
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2005-02-20 12:06:25 -05:00
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\func{}{\destruct{wxBrush}}{\void}
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Destructor.
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See \helpref{reference-counted object destruction}{refcountdestruct} for more info.
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\wxheading{Remarks}
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Although all remaining brushes are deleted when the application exits,
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the application should try to clean up all brushes itself. This is because
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wxWidgets cannot know if a pointer to the brush object is stored in an
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application data structure, and there is a risk of double deletion.
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2005-04-01 20:00:09 -05:00
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1998-05-20 10:25:30 -04:00
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\membersection{wxBrush::GetColour}\label{wxbrushgetcolour}
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\constfunc{wxColour\&}{GetColour}{\void}
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Returns a reference to the brush colour.
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\wxheading{See also}
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\helpref{wxBrush::SetColour}{wxbrushsetcolour}
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2005-04-01 20:00:09 -05:00
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1998-05-20 10:25:30 -04:00
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\membersection{wxBrush::GetStipple}\label{wxbrushgetstipple}
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\constfunc{wxBitmap *}{GetStipple}{\void}
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Gets a pointer to the stipple bitmap. If the brush does not have a wxSTIPPLE style,
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this bitmap may be non-NULL but uninitialised (\helpref{wxBitmap:IsOk}{wxbitmapisok} returns false).
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\wxheading{See also}
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\helpref{wxBrush::SetStipple}{wxbrushsetstipple}
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2005-04-01 20:00:09 -05:00
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1998-05-20 10:25:30 -04:00
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\membersection{wxBrush::GetStyle}\label{wxbrushgetstyle}
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\constfunc{int}{GetStyle}{\void}
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Returns the brush style, one of:
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\begin{twocollist}\itemsep=0pt
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\twocolitem{{\bf wxTRANSPARENT}}{Transparent (no fill).}
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\twocolitem{{\bf wxSOLID}}{Solid.}
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\twocolitem{{\bf wxBDIAGONAL\_HATCH}}{Backward diagonal hatch.}
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\twocolitem{{\bf wxCROSSDIAG\_HATCH}}{Cross-diagonal hatch.}
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\twocolitem{{\bf wxFDIAGONAL\_HATCH}}{Forward diagonal hatch.}
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\twocolitem{{\bf wxCROSS\_HATCH}}{Cross hatch.}
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\twocolitem{{\bf wxHORIZONTAL\_HATCH}}{Horizontal hatch.}
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\twocolitem{{\bf wxVERTICAL\_HATCH}}{Vertical hatch.}
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\twocolitem{{\bf wxSTIPPLE}}{Stippled using a bitmap.}
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\twocolitem{{\bf wxSTIPPLE\_MASK\_OPAQUE}}{Stippled using a bitmap's mask.}
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\end{twocollist}
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\wxheading{See also}
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\helpref{wxBrush::SetStyle}{wxbrushsetstyle}, \helpref{wxBrush::SetColour}{wxbrushsetcolour},\rtfsp
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\helpref{wxBrush::SetStipple}{wxbrushsetstipple}
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2005-04-01 20:00:09 -05:00
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2004-11-30 13:46:20 -05:00
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\membersection{wxBrush::IsHatch}\label{wxbrushishatch}
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\constfunc{bool}{IsHatch}{\void}
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Returns true if the style of the brush is any of hatched fills.
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\wxheading{See also}
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\helpref{wxBrush::GetStyle}{wxbrushgetstyle}
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2005-04-01 20:00:09 -05:00
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2006-10-08 17:56:55 -04:00
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\membersection{wxBrush::IsOk}\label{wxbrushisok}
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2006-10-08 17:56:55 -04:00
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\constfunc{bool}{IsOk}{\void}
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2003-01-17 19:16:34 -05:00
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Returns true if the brush is initialised. It will return false if the default
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constructor has been used (for example, the brush is a member of a class, or
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NULL has been assigned to it).
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1998-05-20 10:25:30 -04:00
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\membersection{wxBrush::SetColour}\label{wxbrushsetcolour}
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\func{void}{SetColour}{\param{wxColour\& }{colour}}
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Sets the brush colour using a reference to a colour object.
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\func{void}{SetColour}{\param{const wxString\& }{colourName}}
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Sets the brush colour using a colour name from the colour database.
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\func{void}{SetColour}{\param{unsigned char}{ red}, \param{unsigned char}{ green}, \param{unsigned char}{ blue}}
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Sets the brush colour using red, green and blue values.
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\wxheading{See also}
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\helpref{wxBrush::GetColour}{wxbrushgetcolour}
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2005-04-01 20:00:09 -05:00
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1998-05-20 10:25:30 -04:00
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\membersection{wxBrush::SetStipple}\label{wxbrushsetstipple}
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\func{void}{SetStipple}{\param{const wxBitmap\&}{ bitmap}}
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Sets the stipple bitmap.
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\wxheading{Parameters}
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\docparam{bitmap}{The bitmap to use for stippling.}
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\wxheading{Remarks}
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2000-03-12 12:11:54 -05:00
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The style will be set to wxSTIPPLE, unless the bitmap has a mask associated
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to it, in which case the style will be set to wxSTIPPLE\_MASK\_OPAQUE.
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If the wxSTIPPLE variant is used, the bitmap will be used to fill out the
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area to be drawn. If the wxSTIPPLE\_MASK\_OPAQUE is used, the current
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text foreground and text background determine what colours are used for
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displaying and the bits in the mask (which is a mono-bitmap actually)
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determine where to draw what.
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Note that under Windows 95, only 8x8 pixel large stipple bitmaps are
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supported, Windows 98 and NT as well as GTK support arbitrary bitmaps.
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\wxheading{See also}
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\helpref{wxBitmap}{wxbitmap}
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1998-05-20 10:25:30 -04:00
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\membersection{wxBrush::SetStyle}\label{wxbrushsetstyle}
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1998-06-14 08:11:50 -04:00
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\func{void}{SetStyle}{\param{int}{ style}}
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Sets the brush style.
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\docparam{style}{One of:
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\begin{twocollist}\itemsep=0pt
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\twocolitem{{\bf wxTRANSPARENT}}{Transparent (no fill).}
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\twocolitem{{\bf wxSOLID}}{Solid.}
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\twocolitem{{\bf wxBDIAGONAL\_HATCH}}{Backward diagonal hatch.}
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\twocolitem{{\bf wxCROSSDIAG\_HATCH}}{Cross-diagonal hatch.}
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\twocolitem{{\bf wxFDIAGONAL\_HATCH}}{Forward diagonal hatch.}
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\twocolitem{{\bf wxCROSS\_HATCH}}{Cross hatch.}
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\twocolitem{{\bf wxHORIZONTAL\_HATCH}}{Horizontal hatch.}
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\twocolitem{{\bf wxVERTICAL\_HATCH}}{Vertical hatch.}
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\twocolitem{{\bf wxSTIPPLE}}{Stippled using a bitmap.}
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\twocolitem{{\bf wxSTIPPLE\_MASK\_OPAQUE}}{Stippled using a bitmap's mask.}
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\end{twocollist}}
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\wxheading{See also}
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\helpref{wxBrush::GetStyle}{wxbrushgetstyle}
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2005-04-01 20:00:09 -05:00
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1998-05-20 10:25:30 -04:00
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\membersection{wxBrush::operator $=$}\label{wxbrushassignment}
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\func{wxBrush\&}{operator $=$}{\param{const wxBrush\& }{brush}}
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2006-10-18 13:23:42 -04:00
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Assignment operator, using \helpref{reference counting}{trefcount}.
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2005-04-01 20:00:09 -05:00
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1998-05-20 10:25:30 -04:00
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\membersection{wxBrush::operator $==$}\label{wxbrushequals}
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\func{bool}{operator $==$}{\param{const wxBrush\& }{brush}}
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2006-10-30 14:26:48 -05:00
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Equality operator.
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See \helpref{reference-counted object comparison}{refcountequality} for more info.
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1998-05-20 10:25:30 -04:00
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\membersection{wxBrush::operator $!=$}\label{wxbrushnotequals}
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\func{bool}{operator $!=$}{\param{const wxBrush\& }{brush}}
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2006-10-30 14:26:48 -05:00
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Inequality operator.
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See \helpref{reference-counted object comparison}{refcountequality} for more info.
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1998-05-20 10:25:30 -04:00
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\section{\class{wxBrushList}}\label{wxbrushlist}
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A brush list is a list containing all brushes which have been created.
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\wxheading{Derived from}
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\helpref{wxList}{wxlist}\\
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\helpref{wxObject}{wxobject}
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1999-02-15 15:41:29 -05:00
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\wxheading{Include files}
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<wx/gdicmn.h>
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1998-05-20 10:25:30 -04:00
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\wxheading{Remarks}
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There is only one instance of this class: {\bf wxTheBrushList}. Use
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this object to search for a previously created brush of the desired
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type and create it if not already found. In some windowing systems,
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the brush may be a scarce resource, so it can pay to reuse old
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resources if possible. When an application finishes, all brushes will
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be deleted and their resources freed, eliminating the possibility of
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`memory leaks'. However, it is best not to rely on this automatic
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cleanup because it can lead to double deletion in some circumstances.
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2004-05-04 04:27:20 -04:00
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There are two mechanisms in recent versions of wxWidgets which make the
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1998-05-20 10:25:30 -04:00
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brush list less useful than it once was. Under Windows, scarce resources
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2005-04-08 10:34:30 -04:00
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are cleaned up internally if they are not being used. Also, a reference
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1998-05-20 10:25:30 -04:00
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counting mechanism applied to all GDI objects means that some sharing
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of underlying resources is possible. You don't have to keep track of pointers,
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2005-04-08 10:34:30 -04:00
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working out when it is safe delete a brush, because the reference counting does
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1998-05-20 10:25:30 -04:00
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it for you. For example, you can set a brush in a device context, and then
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immediately delete the brush you passed, because the brush is `copied'.
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So you may find it easier to ignore the brush list, and instead create
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and copy brushes as you see fit. If your Windows resource meter suggests
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your application is using too many resources, you can resort to using
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GDI lists to share objects explicitly.
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2004-05-04 04:27:20 -04:00
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The only compelling use for the brush list is for wxWidgets to keep
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1998-05-20 10:25:30 -04:00
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track of brushes in order to clean them up on exit. It is also kept for
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2004-05-04 04:27:20 -04:00
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backward compatibility with earlier versions of wxWidgets.
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1998-05-20 10:25:30 -04:00
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\wxheading{See also}
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\helpref{wxBrush}{wxbrush}
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\latexignore{\rtfignore{\wxheading{Members}}}
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2005-04-01 20:00:09 -05:00
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1998-05-20 10:25:30 -04:00
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\membersection{wxBrushList::wxBrushList}\label{wxbrushlistconstr}
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\func{void}{wxBrushList}{\void}
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Constructor. The application should not construct its own brush list:
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use the object pointer {\bf wxTheBrushList}.
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2005-04-01 20:00:09 -05:00
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\membersection{wxBrushList::FindOrCreateBrush}\label{wxbrushlistfindorcreatebrush}
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1998-05-20 10:25:30 -04:00
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2005-04-01 20:00:09 -05:00
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\func{wxBrush *}{FindOrCreateBrush}{\param{const wxColour\& }{colour}, \param{int}{ style = wxSOLID}}
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1998-05-20 10:25:30 -04:00
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Finds a brush with the specified attributes and returns it, else creates a new brush, adds it
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to the brush list, and returns it.
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\wxheading{Parameters}
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\docparam{colour}{Colour object.}
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\docparam{style}{Brush style. See \helpref{wxBrush::SetStyle}{wxbrushsetstyle} for a list of styles.}
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2005-04-01 20:00:09 -05:00
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