[英]Polygon Collision Testing / Polygon Overlap Test in C# - Not Point in Polygon
I am testing to determine if two polygons overlap. 我正在测试以确定两个多边形是否重叠。 I have developed a first version which does a simple point in polygon test (Fig 1).
我开发了第一个版本,它在多边形测试中做了一个简单的点(图1)。 However I am looking to revamp that method to deal with situations where no vertices of polygon A are in polygon B but their line segments overlap (Fig B).
但是,我希望改进这种方法来处理多边形A的顶点不在多边形B但是它们的线段重叠的情况(图B)。
Any help getting started would be greatly appreciated. 任何帮助入门将不胜感激。
Here is an example with using Region: 以下是使用Region的示例:
GraphicsPath grp = new GraphicsPath();
// Create an open figure
grp.AddLine(10, 10, 10, 50); // a of polygon
grp.AddLine(10, 50, 50, 50); // b of polygon
grp.CloseFigure(); // close polygon
// Create a Region regarding to grp
Region reg = new Region(grp);
Now you can use the Method Region.IsVisible to determine whether the region is in an Rectangle or Point. 现在,您可以使用方法Region.IsVisible来确定区域是在Rectangle还是Point中。
The solution: 解决方案:
I modified some code found here . 我在这里修改了一些代码。
private Region FindIntersections(List<PolyRegion> regions)
{
if (regions.Count < 1) return null;
Region region = new Region();
for (int i = 0; i < regions.Count; i++)
{
using (GraphicsPath path = new GraphicsPath())
{
path.AddPath(regions[i].Path, false);
region.Intersect(path);
}
}
return region;
}
The result: 结果:
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