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/// 离心率 /// 返回两点间的角度 private
double PointToAngle(Point AOrigin, Point APoint, double
AEccentricity) { if
(APoint.X == AOrigin.X)if (APoint.Y > AOrigin.Y) return
Math.PI * 0.5; else
return Math.PI * 1.5; else
if (APoint.Y == AOrigin.Y) if
(APoint.X > AOrigin.X) return
0; else
return Math.PI; else { double
Result = Math.Atan((AOrigin.Y - APoint.Y) / (AOrigin.X - APoint.X) * AEccentricity); if
((APoint.X <</SPAN> AOrigin.X) && (APoint.Y > AOrigin.Y)) return
Result + Math.PI; else
if ((APoint.X <</SPAN> AOrigin.X) && (APoint.Y <</SPAN> AOrigin.Y)) return
Result + Math.PI; else
if ((APoint.X > AOrigin.X) && (APoint.Y <</SPAN> AOrigin.Y)) return
Result + 2 * Math.PI; else
return Result; } } |
原文：http://www.cnblogs.com/123ing/p/3703732.html