private HPoint[] GetOutlinedRect(HPoint p1, HPoint p2, int outline)
{
/* p1
* +--+--+
* \ \ \
* \ \ \
* +--+--+
* p2 p2+len
*
*/
if (p1 == p2)
{
return new[] { p1, p1, p1, p1 };
}
var pt1 = new Point2D(p1.X, p1.Y);
var pt2 = new Point2D(p2.X, p2.Y);
var vector = Vector2D.FromPoints(pt2, pt1);
var points = new[]{
new Point2D(-outline,0),
new Point2D(0,outline),
new Point2D(vector.Length,outline),
new Point2D(vector.Length+outline,0),
new Point2D(vector.Length,-outline),
new Point2D(0,-outline),
new Point2D(-outline,0),
};
var rotated = points.Select(pt => pt1.Add(pt.Rotate(vector.Angle))).Select(pt => new HPoint((int)pt.X, (int)pt.Y)).ToArray();
return rotated;
}
public Point2D Add(Point2D p2)
{
return new Point2D(X + p2.X, Y + p2.Y);
}
public Size2D Sub(Point2D p2)
{
return new Size2D(X-p2.X, Y-p2.Y);
}
public static Vector2D FromPoints(Point2D p1, Point2D p2)
{
return new Vector2D(new Size2D(p1.X - p2.X, p1.Y - p2.Y));
}