C++ (Cpp) QgsRenderContext::constPainter Examples

Example #1

File: qgsdiagramrendererv2.cpp Project: namhh/Quantum-GIS

void QgsDiagramRendererV2::convertSizeToMapUnits( QSizeF& size, const QgsRenderContext& context ) const
{
    if ( !size.isValid() )
    {
        return;
    }

    int dpi = dpiPaintDevice( context.constPainter() );
    if ( dpi < 0 )
    {
        return;
    }

    double pixelToMap = dpi / 25.4 * context.mapToPixel().mapUnitsPerPixel();
    size.rwidth() *= pixelToMap;
    size.rheight() *= pixelToMap;
}