SND\wo80_cp
b8972bfcd3
git-svn-id: https://triangle.svn.codeplex.com/svn@73114 0e2699bc-83d4-4a8f-98e7-55e24ab8c7a5
95 lines
3.0 KiB
C#
95 lines
3.0 KiB
C#
// -----------------------------------------------------------------------
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// <copyright file="RingPolygon.cs" company="">
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// Christian Woltering, Triangle.NET, http://triangle.codeplex.com/
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// </copyright>
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// -----------------------------------------------------------------------
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namespace MeshExplorer.Generators
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{
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using TriangleNet.Geometry;
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/// <summary>
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/// Generates a ring polygon.
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/// </summary>
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public class CircleWithHole : BaseGenerator
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{
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public CircleWithHole()
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{
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name = "Circle with Hole";
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description = "";
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parameter = 2;
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descriptions[0] = "Number of points:";
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descriptions[1] = "Outer radius:";
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ranges[0] = new int[] { 100, 250 };
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ranges[1] = new int[] { 2, 15 };
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}
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public override InputGeometry Generate(double param0, double param1, double param2)
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{
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// Number of points on the outer circle
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int n = GetParamValueInt(0, param0);
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int count, npoints;
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double radius = GetParamValueInt(1, param1);
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// Step size on the outer circle
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double h = 2 * Math.PI * radius / n;
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// Current radius and step size
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double r, dphi;
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InputGeometry input = new InputGeometry(n + 1);
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// Inner cirlce (radius = 1)
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r = 1;
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npoints = (int)(2 * Math.PI * r / h);
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dphi = 2 * Math.PI / npoints;
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for (int i = 0; i < npoints; i++)
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{
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input.AddPoint(r * Math.Cos(i * dphi), r * Math.Sin(i * dphi), 1);
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input.AddSegment(i, (i + 1) % npoints, 1);
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}
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count = input.Count;
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// Center cirlce
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r = (radius + 1) / 2.0;
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npoints = (int)(2 * Math.PI * r / h);
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dphi = 2 * Math.PI / npoints;
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for (int i = 0; i < npoints; i++)
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{
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input.AddPoint(r * Math.Cos(i * dphi), r * Math.Sin(i * dphi), 2);
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input.AddSegment(count + i, count + (i + 1) % npoints, 2);
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}
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count = input.Count;
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// Outer cirlce
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r = radius;
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npoints = (int)(2 * Math.PI * r / h);
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dphi = 2 * Math.PI / npoints;
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for (int i = 0; i < npoints; i++)
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{
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input.AddPoint(r * Math.Cos(i * dphi), r * Math.Sin(i * dphi), 3);
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input.AddSegment(count + i, count + (i + 1) % npoints, 3);
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}
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input.AddHole(0, 0);
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// Regions: |++++++|++++++|---|
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// r 1 0
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input.AddRegion((r + 3.0) / 4.0, 0, 1);
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input.AddRegion((3 * r + 1.0) / 4.0, 0, 2);
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return input;
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}
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}
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}
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