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Update bounding box when drawing gradients in drawing sample

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Advanced gradients are drawn using wxGraphicsContext and hence bounding box for underlying wxDC is not updated automatically. We need to update bounding box with extents of all used graphics paths.
This commit is contained in:
Artur Wieczorek
2017-03-06 18:48:49 +01:00
parent 92b64ff997
commit da66e81fb9
1 changed files with 19 additions and 0 deletions
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19
samples/drawing/drawing.cpp
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@@ -1452,6 +1452,7 @@ void MyCanvas::DrawGradients(wxDC& dc)
wxGraphicsContext *gc = gdc.GetGraphicsContext();
wxGraphicsPath pth;
wxGraphicsGradientStops stops;
double boxX, boxY, boxWidth, boxHeight;
gfr.Offset(0, gfr.height + 10);
dc.DrawText(wxT("Linear Gradient with Stops"), gfr.x, gfr.y);
@@ -1471,6 +1472,9 @@ void MyCanvas::DrawGradients(wxDC& dc)
pth.AddLineToPoint(gfr.x,gfr.y+gfr.height);
pth.CloseSubpath();
gc->FillPath(pth);
pth.GetBox(&boxX, &boxY, &boxWidth, &boxHeight);
dc.CalcBoundingBox(wxRound(boxX), wxRound(boxY));
dc.CalcBoundingBox(wxRound(boxX+boxWidth), wxRound(boxY+boxHeight));
wxGraphicsGradientStops simpleStops(*wxRED, *wxBLUE);
@@ -1493,6 +1497,9 @@ void MyCanvas::DrawGradients(wxDC& dc)
pth.AddLineToPoint(gfr.x,gfr.y+gfr.height);
pth.CloseSubpath();
gc->FillPath(pth);
pth.GetBox(&boxX, &boxY, &boxWidth, &boxHeight);
dc.CalcBoundingBox(wxRound(boxX), wxRound(boxY));
dc.CalcBoundingBox(wxRound(boxX+boxWidth), wxRound(boxY+boxHeight));
gfr.Offset(0, gfr.height + 10);
dc.DrawText(wxT("Radial Gradient from Red to Blue with Yellow and Green Stops"),
@@ -1512,6 +1519,9 @@ void MyCanvas::DrawGradients(wxDC& dc)
pth.AddLineToPoint(gfr.x,gfr.y+gfr.height);
pth.CloseSubpath();
gc->FillPath(pth);
pth.GetBox(&boxX, &boxY, &boxWidth, &boxHeight);
dc.CalcBoundingBox(wxRound(boxX), wxRound(boxY));
dc.CalcBoundingBox(wxRound(boxX+boxWidth), wxRound(boxY+boxHeight));
gfr.Offset(0, gfr.height + 10);
dc.DrawText(wxT("Linear Gradient with Stops and Gaps"), gfr.x, gfr.y);
@@ -1533,6 +1543,9 @@ void MyCanvas::DrawGradients(wxDC& dc)
pth.AddLineToPoint(gfr.x,gfr.y+gfr.height);
pth.CloseSubpath();
gc->FillPath(pth);
pth.GetBox(&boxX, &boxY, &boxWidth, &boxHeight);
dc.CalcBoundingBox(wxRound(boxX), wxRound(boxY));
dc.CalcBoundingBox(wxRound(boxX+boxWidth), wxRound(boxY+boxHeight));
gfr.Offset(0, gfr.height + 10);
dc.DrawText(wxT("Radial Gradient with Stops and Gaps"), gfr.x, gfr.y);
@@ -1551,6 +1564,9 @@ void MyCanvas::DrawGradients(wxDC& dc)
pth.AddLineToPoint(gfr.x,gfr.y+gfr.height);
pth.CloseSubpath();
gc->FillPath(pth);
pth.GetBox(&boxX, &boxY, &boxWidth, &boxHeight);
dc.CalcBoundingBox(wxRound(boxX), wxRound(boxY));
dc.CalcBoundingBox(wxRound(boxX+boxWidth), wxRound(boxY+boxHeight));
gfr.Offset(0, gfr.height + 10);
dc.DrawText(wxT("Gradients with Stops and Transparency"), gfr.x, gfr.y);
@@ -1586,6 +1602,9 @@ void MyCanvas::DrawGradients(wxDC& dc)
gfr.x + gfr.width, gfr.y,
stops));
gc->FillPath(pth);
pth.GetBox(&boxX, &boxY, &boxWidth, &boxHeight);
dc.CalcBoundingBox(wxRound(boxX), wxRound(boxY));
dc.CalcBoundingBox(wxRound(boxX+boxWidth), wxRound(boxY+boxHeight));
}
#endif // wxUSE_GRAPHICS_CONTEXT
}