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Add support for affine transformation matrix in wxGCDC

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Graphics renderers (exposed through wxGraphicsContext) support arbitrary affine transformations so it is possible to add support for affine transformations in wxGCDC by implementing all wxGCDC::*TransformMatrix() functions with calls to respective wxGraphicsContext functions.
Additionally, this implementation adds support for affine transformations in wxDC under wxGTK3 because in this port wxDC is equivalent to wxGCDC.
This commit is contained in:
Artur Wieczorek
2016-09-07 23:49:06 +02:00
parent 0bf38e11a3
commit 49000defcf
5 changed files with 63 additions and 9 deletions
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16
interface/wx/dc.h
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@@ -155,7 +155,7 @@ struct wxFontMetrics
In general wxDC methods don't support alpha transparency and the alpha
component of wxColour is simply ignored and you need to use wxGraphicsContext
for full transparency support. There are, however, a few exceptions: first,
under OS X colours with alpha channel are supported in all the normal
under OS X and GTK+ 3 colours with alpha channel are supported in all the normal
wxDC-derived classes as they use wxGraphicsContext internally. Second,
under all platforms wxSVGFileDC also fully supports alpha channel. In both
of these cases the instances of wxPen or wxBrush that are built from
@@ -164,12 +164,15 @@ struct wxFontMetrics
@section dc_transform_support Support for Transformation Matrix
On some platforms (currently only under MSW) wxDC has support for applying
an arbitrary affine transformation matrix to its coordinate system. Call
CanUseTransformMatrix() to check if this support is available and then call
SetTransformMatrix() if it is. If the transformation matrix is not
On some platforms (currently under MSW, GTK+ 3) wxDC has support for applying
an arbitrary affine transformation matrix to its coordinate system. (Since
3.1.1 this feature is also supported by wxGCDC in all ports.)
Call CanUseTransformMatrix() to check if this support is available and then
call SetTransformMatrix() if it is. If the transformation matrix is not
supported, SetTransformMatrix() always simply returns false and doesn't do
anything.
This feature is only available when @c wxUSE_DC_TRANSFORM_MATRIX build
option is enabled.
@library{wxcore}
@@ -1530,7 +1533,8 @@ public:
Check if the use of transformation matrix is supported by the current
system.
Currently this function always returns @false for non-MSW platforms.
This function returns @true for MSW and GTK+ 3 platforms and since
3.1.1 also for wxGCDC in all ports.
@since 2.9.2
*/