65 lines
1.7 KiB
C#
65 lines
1.7 KiB
C#
using System;
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using System.Collections.Generic;
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namespace Assets.Common
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{
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public static class PointUtils
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{
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public static Point Mean(IEnumerable<Point> points)
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{
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var result = new Point(0, 0);
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var i = 0;
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foreach (var point in points)
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{
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result.x = (result.x * i + point.x) / (i + 1);
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result.y = (result.y * i + point.y) / (i + 1);
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i++;
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}
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return result;
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}
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public static double AngleBetween(Point center, Point a, Point b)
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{
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a = a - center;
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b = b - center;
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var dot = a.x * b.x + a.y * b.y;
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var det = a.x * b.y - a.y * b.x;
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var angle = Math.Atan2(det, dot);
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return angle > 0 ? angle : 2*Math.PI + angle;
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}
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public static bool IsClockwise(Point center, Point a, Point b)
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{
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var xa = a.x - center.x;
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var xb = b.x - center.x;
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var ya = a.y - center.y;
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var yb = b.y - center.y;
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return xa * yb - xb * ya < 0;
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}
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public static bool IsPointInside(Point point, Point[] polygon)
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{
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var j = polygon.Length - 1;
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var inside = false;
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for (int i = 0; i < polygon.Length; j = i++)
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{
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var pi = polygon[i];
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var pj = polygon[j];
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if (((pi.y <= point.y && point.y < pj.y) || (pj.y <= point.y && point.y < pi.y)) &&
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(point.x < (pj.x - pi.x) * (point.y - pi.y) / (pj.y - pi.y) + pi.x))
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inside = !inside;
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}
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return inside;
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}
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}
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} |