任意一个点A(x,y)围绕任意一个点B(a,b)旋转任意角度后的坐标值
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2022-04-01 18:42:10
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/// <summary>
/// 求p围绕pCenter旋转angle后的坐标值
/// </summary>
/// <param name="p">需要旋转的坐标</param>
/// <param name="pCenter">围绕的坐标</param>
/// <param name="angle">旋转角度，大于0逆时针，小于0顺时针</param>
/// <returns></returns>
private static Point calcNewPoint(Point p, Point pCenter, float angle)
{
// calc arc
float l = (float)((angle * Math.PI) / 180);
//sin/cos value
float cosv = (float)Math.Cos(l);
float sinv = (float)Math.Sin(l);
// calc new point
float newX = (float)((p.X - pCenter.X) * cosv - (p.Y - pCenter.Y) * sinv + pCenter.X);
float newY = (float)((p.X - pCenter.X) * sinv + (p.Y - pCenter.Y) * cosv + pCenter.Y);
return new Point((int)newX, (int)newY);
}