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Fixed calculation of clipping box with negative size (wxGCDC).

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Graphics renderers accept negative clipping box size but for internal calculations done in wxDCImpl::DoSetClippingRegion() we need to have a box defined by (x,y) at top-left corner and having non-negative size so we need to recalculate parameters if necessary.
This commit is contained in:
Artur Wieczorek 2016-07-03 21:31:37 +02:00
parent dafd0f217b
commit d50f331a99
1 changed files with 14 additions and 0 deletions
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14
src/common/dcgraph.cpp
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@ -279,6 +279,20 @@ void wxGCDCImpl::DoSetClippingRegion( wxCoord x, wxCoord y, wxCoord w, wxCoord h
{
wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoSetClippingRegion - invalid DC") );
// Generally, renderers accept negative values of width/height
// but for internal calculations we need to have a box definition
// in the standard form, with (x,y) pointing to the top-left
// corner of the box and with non-negative width and height.
if ( w < 0 )
{
w = -w;
x -= (w - 1);
}
if ( h < 0 )
{
h = -h;
y -= (h - 1);
}
m_graphicContext->Clip( x, y, w, h );
wxDCImpl::DoSetClippingRegion(x, y, w, h);