public static LineF RotateLineAroundPoint(LineF ln, PointF pt, double ang)
{
return(new LineF(
RotatePoint(ln.p1, pt, ang),
RotatePoint(ln.p2, pt, ang)));
}
public static double LineAngle(LineF ln)
{
return(Math.Atan2(ln.p2.Y - ln.p1.Y, ln.p2.X - ln.p1.X));
}
public static LineF RotateLine(LineF ln, double ang)
{
PointF center = PointOps.Mult(PointOps.Add(ln.p1, ln.p2), 0.5f);
return(RotateLineAroundPoint(ln, center, ang));
}
