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Like Direct2D inverting the matrix is needed for gradient transforms

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This commit is contained in:
Robin Dunn
2019-08-02 23:03:45 -07:00
parent fc35d8b49b
commit 1e37cca162
1 changed files with 19 additions and 18 deletions
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37
src/msw/graphics.cpp
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@@ -752,7 +752,7 @@ wxGDIPlusPenBrushBaseData::CreateLinearGradientBrush(
wxDouble x1, wxDouble y1,
wxDouble x2, wxDouble y2,
const wxGraphicsGradientStops& stops,
const wxGraphicsMatrix& WXUNUSED(matrix))
const wxGraphicsMatrix& matrix)
{
LinearGradientBrush * const
brush = new LinearGradientBrush(PointF(x1, y1) , PointF(x2, y2),
@@ -762,14 +762,13 @@ wxGDIPlusPenBrushBaseData::CreateLinearGradientBrush(
// Tell the brush how to draw what's beyond the ends of the gradient
brush->SetWrapMode(WrapModeTileFlipXY);
// Apply the matrix
// This doesn't work as I expected it to. Comment-out for now...
// FIXME
// if (! matrix.IsNull())
// {
// const Matrix* m = static_cast<const Matrix*>(matrix.GetNativeMatrix());
// brush->SetTransform(m);
// }
// Apply the matrix if there is one
if (! matrix.IsNull())
{
Matrix* m = static_cast<Matrix*>(matrix.GetNativeMatrix());
m->Invert();
brush->MultiplyTransform(m);
}
SetGradientStops(brush, stops);
m_brush = brush;
@@ -781,7 +780,7 @@ wxGDIPlusPenBrushBaseData::CreateRadialGradientBrush(
wxDouble xc, wxDouble yc,
wxDouble radius,
const wxGraphicsGradientStops& stops,
const wxGraphicsMatrix& WXUNUSED(matrix))
const wxGraphicsMatrix& matrix)
{
m_brushPath = new GraphicsPath();
m_brushPath->AddEllipse( (REAL)(xc-radius), (REAL)(yc-radius),
@@ -795,14 +794,16 @@ wxGDIPlusPenBrushBaseData::CreateRadialGradientBrush(
int count = 1;
brush->SetSurroundColors(&col, &count);
// Apply the matrix
// This doesn't work as I expected it to. Comment-out for now...
// FIXME
// if (! matrix.IsNull())
// {
// const Matrix* m = static_cast<const Matrix*>(matrix.GetNativeMatrix());
// brush->SetTransform(m);
// }
// TODO: There doesn't seem to be an equivallent for SetWrapMode, so
// the area outside of the gradient's radius is not getting painted.
// Apply the matrix if there is one
if (! matrix.IsNull())
{
Matrix* m = static_cast<Matrix*>(matrix.GetNativeMatrix());
m->Invert();
brush->SetTransform(m);
}
// Because the GDI+ API draws radial gradients from outside towards the
// center we have to reverse the order of the gradient stops.