两点计算角度

转载

mob604757027d04 2016-09-09 08:53:00

/// <summary>

/// 两点计算角度

/// </summary>

/// <param name="startx"></param>

/// <param name="starty"></param>

/// <param name="endx"></param>

/// <param name="endy"></param>

/// <returns></returns>

public static double CalulateXYAnagle(double startx, double starty, double endx, double endy)

{

　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　//除数不能为0

double tan = Math.Atan(Math.Abs((endy - starty) / (endx - startx))) * 180 / Math.PI;

if (endx > startx && endy > starty)//第一象限

{

return -tan;

}

else if (endx > startx && endy < starty)//第二象限

{

return tan;

}

else if (endx < startx && endy > starty)//第三象限

{

return tan - 180;

}

else

{

return 180 - tan;

}

`/// <summary>``/// 计算旋转角度``/// </summary>``/// <param name="nowpoint"></param>``/// <returns></returns>``public``double``ComputeAngle(Point nowpoint)``{``//斜边长度``double``length = PointLegth(nowpoint, CentPoint);``//对边比斜边 sin``double``hudu = Math.Asin(Math.Abs(nowpoint.Y - CentPoint.Y)/length);``double``ag = hudu*180/Math.PI;``//第一象限90-``if``((CentPoint.X - nowpoint.X) <= 0 && (CentPoint.Y - nowpoint.Y) >= 0)``ag = 90 - ag;``//第二象限90+``else``if``((CentPoint.X - nowpoint.X) <= 0 && (CentPoint.Y - nowpoint.Y) <= 0)``ag = ag + 90;``//第三象限270-``else``if``((CentPoint.X - nowpoint.X) >= 0 && (CentPoint.Y - nowpoint.Y) <= 0)``ag = 270 - ag;``//第四象限270+``else``if``((CentPoint.X - nowpoint.X) >= 0 && (CentPoint.Y - nowpoint.Y) >= 0)``ag = ag + 270;``//偏移``ag -= 235;``return``ag;``}``/// <summary>``/// 计算两点间距离``/// </summary>``/// <param name="pa"></param>``/// <param name="pb"></param>``/// <returns></returns>``public``double``PointLegth(Point pa, Point pb)``{``return``Math.Sqrt(Math.Pow((pa.X - pb.X), 2) + Math.Pow((pa.Y - pb.Y), 2));``}`