/// <summary>
/// 计算两点之间的夹角
/// </summary>
/// <param name=”cen”></param>
/// <param name=”second”></param>
/// <param name=”first”></param>
/// <returns></returns>
public static double Angle(PointF cen, PointF second, PointF first)
{
double ma_x = first.X – cen.X;
double ma_y = first.Y – cen.Y;
double mb_x = second.X – cen.X;
double mb_y = second.Y – cen.Y;
double v1 = (ma_x * mb_x) + (ma_y * mb_y);
double ma_val = Math.Sqrt(ma_x * ma_x + ma_y * ma_y);
double mb_val = Math.Sqrt(mb_x * mb_x + mb_y * mb_y);
double cosM = v1 / (ma_val * mb_val);
double angleAMB = Math.Acos(cosM) * 180 / Math.PI;
return angleAMB;
}
/// <summary>
/// 计算鼠标移动的方向（顺时针或逆时针）
/// </summary>
/// <param name=”start”></param>
/// <param name=”end”></param>
/// <param name=”Ccenter”></param>
/// <returns></returns>
private bool CalDir(PointF start, PointF end, PointF Ccenter)
{
if ((end.X – start.X) * (center.Y – start.Y) – (end.Y – start.Y) * (center.X – start.X) > 0)
return false;
else
return true;
}
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