I tried to do this for a while, but did not have much success. All I want to do is rotate the rectangle, and then create a new rectangle that includes the rotated points.
Anyone have any ideas how this should be done right?
The code I have doesn’t work, but I’m not sure where it is going wrong (the numbers make me think it really works), for example, if I have a rectangle with the following values:
{X:865 Y:76 Width:22 Height:164}
Result:
{X:1863 Y:1740 Width:164 Height:22}
Where is it turned -1.57094443
What I'm doing is grab all four points of the original rectangle and rotate them using this function:
static public Vector2 RotateVectorAround(Vector2 anchor, Vector2 vector, float rotation) { Matrix mat = new Matrix(); mat.Translation = new Vector3(vector.X - anchor.X, vector.Y - anchor.Y, 0); Matrix rot = new Matrix(); rot = Matrix.CreateRotationZ(rotation); mat *= rot; mat.Translation += new Vector3(anchor.X, anchor.Y, 0); return new Vector2(mat.Translation.X, mat.Translation.Y); }
Where the "anchor" is the pivot point (I'm not sure if this function sounds mathematically), then I determine the angles of the rotating rectangle as follows:
Vector2 newTopLeft = new Vector2( Math.Min(Math.Min(topleft.X, bottomRight.X), Math.Min(bottomleft.X, topright.X)), Math.Min(Math.Min(topleft.Y, bottomRight.Y), Math.Min(bottomleft.Y, topright.Y))); Vector2 newBottomRight = new Vector2( Math.Max(Math.Max(topleft.X, bottomRight.X), Math.Max(bottomleft.X, topright.X)), Math.Max(Math.Max(topleft.Y, bottomRight.Y), Math.Max(bottomleft.Y, topright.Y) ));