private void Calc2Point(int px, int py, out double xx, out double yy)
{
PointW p1 = plist[0];
PointW p2 = plist[1];
int vx = p2.x - p1.x;
int vy = p2.y - p1.y;
double wx = p2.wx - p1.wx;
double wy = p2.wy - p1.wy;
PointW p3 = new PointW(-1, p1.x - vy, p1.y + vx, p1.wx - wy, p1.wy + wx);
PointWList plw = new PointWList();
plw.Add(p1);
plw.Add(p2);
plw.Add(p3);
CoordConverter cnv = new CoordConverter(plw);
cnv.Calculate();
cnv.ConvertPointD2W(px, py, out xx, out yy);
}
internal CoordConverter(PointWList plist)
{
this.plist = plist;
}