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Don't use wxDC to get clipping box in wxGCDC

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We shouldn't call wxDCImpl::DoGetClippingRect() from
wxGCDCImpl::DoGetClippingRect() because it wouldn't return the correct
result if there is an affine transformation applied to this DC,
as wxDCImpl is not aware of such transformations.
This commit is contained in:
Artur Wieczorek
2021-07-20 23:06:28 +02:00
parent 9e5c3a1152
commit 7ce588afab
1 changed files with 12 additions and 1 deletions
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13
src/common/dcgraph.cpp
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@@ -355,7 +355,18 @@ bool wxGCDCImpl::DoGetClippingRect(wxRect& rect) const
self->UpdateClipBox(); self->UpdateClipBox();
} }
return wxDCImpl::DoGetClippingRect(rect); // We shouldn't call wxDCImpl::DoGetClippingRect() here
// because it wouldn't return the correct result if there is
// affine transformation applied to this DC, as the base
// class is not aware of affine transformations.
// We can just use the value returned by our UpdateClipBox()
// which is already correct.
if ( m_clipX1 == m_clipX2 || m_clipY1 == m_clipY2 )
rect = wxRect(); // empty clip region
else
rect = wxRect(m_clipX1, m_clipY1, m_clipX2 - m_clipX1, m_clipY2 - m_clipY1);
return m_clipping;
} }
void wxGCDCImpl::DoSetClippingRegion( wxCoord x, wxCoord y, wxCoord w, wxCoord h ) void wxGCDCImpl::DoSetClippingRegion( wxCoord x, wxCoord y, wxCoord w, wxCoord h )