52 lines
1.7 KiB
C#
52 lines
1.7 KiB
C#
using System;
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using System.Collections.Generic;
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namespace TMI_practicum
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{
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public class Circle
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{
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public readonly double X;
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public readonly double Y;
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public readonly double R;
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public Circle(double x, double y, double r)
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{
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X = x;
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Y = y;
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R = r;
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}
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public double Distance(Circle otherCircle)
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{
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return Math.Round(Math.Sqrt(Math.Pow(X - otherCircle.X, 2) + Math.Pow(Y - otherCircle.Y, 2)), 15);
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}
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public IEnumerable<Intersection> FindIntersections(Circle c1)
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{
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IList<Intersection> intersections;
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double d = Distance(c1);
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if (d > R + c1.R || d < Math.Abs(R - c1.R) || (d == 0.0 && R - c1.R == 0.0)) return null;
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double a = (R * R - c1.R * c1.R + d * d) / (2.0*d);
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double px = X + a * (c1.X - X) / d;
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double py = Y + a * (c1.Y - Y) / d;
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double htemp = Math.Round(R * R - a * a, 15);
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if (htemp == 0)
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{
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intersections = new Intersection[1];
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intersections[0] = new Intersection(Math.Round(px, 15), Math.Round(py, 15));
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}
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else
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{
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intersections = new Intersection[2];
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double h = Math.Round(Math.Sqrt(htemp), 15);
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intersections[0] = new Intersection(Math.Round(px + h * (c1.Y - Y) / d, 15), Math.Round(py - h * (c1.X - X) / d, 15));
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intersections[1] = new Intersection(Math.Round(px - h * (c1.Y - Y) / d, 15), Math.Round(py + h * (c1.X - X) / d, 15));
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}
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return intersections;
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}
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}
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} |