68 lines
2.2 KiB
C#
68 lines
2.2 KiB
C#
using System;
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class RayCasting {
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static bool Intersects(int[] A, int[] B, double[] P) {
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if (A[1] > B[1])
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return Intersects(B, A, P);
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if (P[1] == A[1] || P[1] == B[1])
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P[1] += 0.0001;
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if (P[1] > B[1] || P[1] < A[1] || P[0] >= Math.Max(A[0], B[0]))
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return false;
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if (P[0] < Math.Min(A[0], B[0]))
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return true;
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double red = (P[1] - A[1]) / (P[0] - A[0]);
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double blue = (B[1] - A[1]) / (B[0] - A[0]);
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return red >= blue;
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}
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static bool Contains(int[][] shape, double[] pnt) {
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bool inside = false;
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int len = shape.Length;
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for (int i = 0; i < len; i++) {
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if (Intersects(shape[i], shape[(i + 1) % len], pnt))
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inside = !inside;
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}
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return inside;
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}
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public static void Main(string[] args) {
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double[][] testPoints = new double[][] {
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new double[] { 10, 10 }, new double[] { 10, 16 }, new double[] { -20, 10 },
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new double[] { 0, 10 }, new double[] { 20, 10 }, new double[] { 16, 10 },
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new double[] { 20, 20 }
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};
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foreach (int[][] shape in shapes) {
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foreach (double[] pnt in testPoints)
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Console.Write($"{Contains(shape, pnt),7} ");
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Console.WriteLine();
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}
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}
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readonly static int[][] square = new int[][] {
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new int[] { 0, 0 }, new int[] { 20, 0 }, new int[] { 20, 20 }, new int[] { 0, 20 }
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};
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readonly static int[][] squareHole = new int[][] {
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new int[] { 0, 0 }, new int[] { 20, 0 }, new int[] { 20, 20 }, new int[] { 0, 20 },
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new int[] { 5, 5 }, new int[] { 15, 5 }, new int[] { 15, 15 }, new int[] { 5, 15 }
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};
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readonly static int[][] strange = new int[][] {
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new int[] { 0, 0 }, new int[] { 5, 5 }, new int[] { 0, 20 }, new int[] { 5, 15 },
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new int[] { 15, 15 }, new int[] { 20, 20 }, new int[] { 20, 0 }
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};
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readonly static int[][] hexagon = new int[][] {
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new int[] { 6, 0 }, new int[] { 14, 0 }, new int[] { 20, 10 }, new int[] { 14, 20 },
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new int[] { 6, 20 }, new int[] { 0, 10 }
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};
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readonly static int[][][] shapes = new int[][][] { square, squareHole, strange, hexagon };
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}
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