wo80
74 lines
2.0 KiB
C#
74 lines
2.0 KiB
C#
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namespace TriangleNet.Examples
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{
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using System;
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using TriangleNet.Geometry;
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using TriangleNet.Meshing;
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using TriangleNet.Meshing.Iterators;
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using TriangleNet.Rendering.Text;
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/// <summary>
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/// Using a user test function to define a maximum edge length constraint.
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/// </summary>
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public static class Example8
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{
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const double MAX_EDGE_LENGTH = 0.2;
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public static bool Run(bool print = false)
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{
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var poly = new Polygon();
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// Generate the input geometry.
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poly.Add(Generate.Rectangle(0.0, 0.0, 1.0, 1.0));
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// Set minimum angle quality option, ignoring holes.
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var quality = new QualityOptions()
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{
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UserTest = MaxEdgeLength
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};
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// Generate mesh using the polygons Triangulate extension method.
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var mesh = (Mesh)poly.Triangulate(quality);
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// Validate.
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foreach (var e in EdgeIterator.EnumerateEdges(mesh))
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{
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double length = Math.Sqrt(DistSqr(e.GetVertex(0), e.GetVertex(1)));
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if (length > MAX_EDGE_LENGTH)
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{
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return false;
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}
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}
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if (print) SvgImage.Save(mesh, "example-8.svg", 500);
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return true;
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}
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static bool MaxEdgeLength(ITriangle tri, double area)
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{
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var p0 = tri.GetVertex(0);
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var p1 = tri.GetVertex(1);
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var p2 = tri.GetVertex(2);
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var s1 = DistSqr(p0, p1);
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var s2 = DistSqr(p1, p2);
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var s3 = DistSqr(p2, p0);
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// Comparing against squared max leg length.
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var maxlen = MAX_EDGE_LENGTH * MAX_EDGE_LENGTH;
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return s1 > maxlen || s2 > maxlen || s3 > maxlen;
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}
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static double DistSqr(Vertex a, Vertex b)
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{
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var dx = a.X - b.X;
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var dy = a.Y - b.Y;
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return dx * dx + dy * dy;
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}
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}
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}
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