CODEWITHSUNDEEP
c#gdi+gdi
el_shayan
el_shayan

Reputation: 2845

Clipping GraphicsPath with another GraphicsPath

How do you Clip a System.Drawing.Drawing2D.GraphicsPath with another GraphicsPath to get a new GraphicsPath?

Note 1: It is possible to SetClip() a whole System.Drawing.Graphics object, but what is needed here is some sort of Intersecting a GraphicsPath to get another GraphicsPath.

Note 2: The method discussed here (Intersecting GraphicsPath objects) returns a region. Here we expect a GraphicsPath

Upvotes: 1

Views: 2251

Answers (1)

Pondidum
Pondidum

Reputation: 11617

I had a quick go at this, and the closest I got was this:

var region = new Region(gp1);
region.Intersect(gp2);

var gpResult = new GraphicsPath();
gpResult.AddRectangles(region.GetRegionScans(new Matrix()));
gpResult.CloseAllFigures();

using (var br = new SolidBrush(Color.LightYellow))
{
    e.Graphics.FillPath(br, gpResult);
    //e.Graphics.DrawPath(Pens.Black, gpResult);
}

The problem with this is that GetRegionScans() gives you thousands of rectangles back, not just the distinct points of the lines. Uncomment the DrawPath method to see what I mean.

There is an open source library for manageing clipping, which seems to be reasonably active here (Found via this Stackoverflow question).

I have no experience with it, but it looks to be able to do what you are after.

Upvotes: 1

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