private static void setClipRegion(Graphics gr, PdfClipRegion clipRegion, float userUnit)
{
if (clipRegion.IntersectedPaths.Count == 0)
{
return;
}
Matrix transformationBefore = gr.Transform;
try
{
gr.Transform = new Matrix(userUnit, 0, 0, userUnit, 0, 0);
foreach (PdfPath clipPath in clipRegion.IntersectedPaths)
{
using (var gdiPath = new GraphicsPath())
{
toGdiPath(clipPath, gdiPath);
gdiPath.Transform(toGdiMatrix(clipPath.TransformationMatrix));
gdiPath.FillMode = (FillMode)clipPath.ClipMode.Value;
gr.SetClip(gdiPath, CombineMode.Intersect);
}
}
}
finally
{
gr.Transform = transformationBefore;
}
}
private static void setClipRegion(PdfCanvas canvas, PdfClipRegion clipRegion)
{
if (clipRegion.IntersectedPaths.Count == 0)
{
return;
}
PdfMatrix transformationBefore = canvas.TransformationMatrix;
try
{
foreach (PdfPath clipPath in clipRegion.IntersectedPaths)
{
canvas.ResetTransform();
canvas.Transform(clipPath.TransformationMatrix);
appendPath(canvas, clipPath);
canvas.SetClip(clipPath.ClipMode.Value);
}
}
finally
{
canvas.ResetTransform();
canvas.Transform(transformationBefore);
}
}
private static void saveStateAndDraw(Graphics gr, PdfClipRegion clipRegion, float userUnit, Action draw)
{
var state = gr.Save();
try
{
setClipRegion(gr, clipRegion, userUnit);
draw();
}
finally
{
gr.Restore(state);
}
}
