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[ASP.net教程]C# 点绕某点旋转某角度


/// <summary>
/// 以中心点旋转Angle角度
/// </summary>
/// <param name="center">中心点</param>
/// <param name="p1">待旋转的点</param>
/// <param name="angle">旋转角度(弧度)</param>
private void PointRotate(Point center, ref Point p1, double angle)
{
double x1 = (p1.X - center.X) * Math.Cos(angle) + (p1.Y - center.Y) * Math.Sin(angle) + center.X;
double y1 = -(p1.X - center.X) * Math.Sin(angle) + (p1.Y - center.Y) * Math.Cos(angle) + center.Y;
p1.X = (int)x1;
p1.Y = (int)y1;
}