01a956eef6
Added new tech tree layout implementation using Microsoft Automatic Graph Layouts Added some functionality to the database editor tools
91 lines
No EOL
3.1 KiB
C#
91 lines
No EOL
3.1 KiB
C#
using System;
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namespace Microsoft.Msagl.GraphmapsWithMesh
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{
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public class PointToSegmentDistance
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{
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public static double GetDistance(Microsoft.Msagl.Core.Geometry.Point pointA, Microsoft.Msagl.Core.Geometry.Point pointB, Microsoft.Msagl.Core.Geometry.Point pointC)
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{
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return GetDistance(new Vertex((int)pointA.X, (int)pointA.Y), new Vertex((int)pointB.X, (int)pointB.Y), new Vertex((int)pointC.X, (int)pointC.Y));
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}
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public static Microsoft.Msagl.Core.Geometry.Point getClosestPoint(Vertex pointA, Vertex pointB, Vertex pointP)
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{
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double[] AP = new double[2];
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AP[0] = pointP.XLoc - pointA.XLoc;
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AP[1] = pointP.YLoc - pointA.YLoc;
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double[] AB = new double[2];
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AB[0] = pointB.XLoc - pointA.XLoc;
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AB[1] = pointB.YLoc - pointA.YLoc;
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double AB_length = AB[0] * AB[0] + AB[1] * AB[1];
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double AP_AB_Dot = AP[0] * AB[0] + AP[1] * AB[1];
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double t = AP_AB_Dot / AB_length;
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if (t < 0) t = 0;
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if (t > 1) t = 1;
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double pointx = pointA.XLoc + AB[0] * t;
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double pointy = pointA.YLoc + AB[1] * t;
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return new Microsoft.Msagl.Core.Geometry.Point(pointx, pointy);
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}
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//Compute the distance from AB to C
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//if isSegment is true, AB is a segment, not a line.
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public static double GetDistance(Vertex pointA, Vertex pointB, Vertex pointC)
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{
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double dist = CrossProduct(pointA, pointB, pointC) / Distance(pointA, pointB);
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double dot1 = DotProduct(pointA, pointB, pointC);
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if (dot1 > 0)
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return Distance(pointB, pointC);
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double dot2 = DotProduct(pointB, pointA, pointC);
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if (dot2 > 0)
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return Distance(pointA, pointC);
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return Math.Abs(dist);
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}
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//Compute the dot product AB . AC
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private static double DotProduct(Vertex pointA, Vertex pointB, Vertex pointC)
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{
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double[] ab = new double[2];
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double[] bc = new double[2];
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ab[0] = pointB.XLoc - pointA.XLoc;
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ab[1] = pointB.YLoc - pointA.YLoc;
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bc[0] = pointC.XLoc - pointB.XLoc;
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bc[1] = pointC.YLoc - pointB.YLoc;
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double dot = ab[0] * bc[0] + ab[1] * bc[1];
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return dot;
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}
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//Compute the cross product AB x AC
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static private double CrossProduct(Vertex pointA, Vertex pointB, Vertex pointC)
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{
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double[] ab = new double[2];
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double[] ac = new double[2];
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ab[0] = pointB.XLoc - pointA.XLoc;
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ab[1] = pointB.YLoc - pointA.YLoc;
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ac[0] = pointC.XLoc - pointA.XLoc;
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ac[1] = pointC.YLoc - pointA.YLoc;
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double cross = ab[0] * ac[1] - ab[1] * ac[0];
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return cross;
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}
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//Compute the distance from A to B
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static double Distance(Vertex pointA, Vertex pointB)
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{
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double d1 = pointA.XLoc - pointB.XLoc;
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double d2 = pointA.YLoc - pointB.YLoc;
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return Math.Sqrt(d1 * d1 + d2 * d2);
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}
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}
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} |