Rotate 2d Polygon Without Changing Its Position

I've got this code: class Vector2D(object): def __init__(self, x=0.0, y=0.0): self.x, self.y = x, y def rotate(self, angle): angle = math.radians(angle)

Solution 1:

You're rotating around 0/0, not around its center. Try moving the polygon before rotating, such that its center is 0/0. Then rotate it, and finally move it back.

For instance, if you only need movement of vertices/polygons for this particular case, you could probably simply adjust rotate to be:

defrotate(self, angle):
    center = self.center()
    for point inself.points:
        point.x -= center.x
        point.y -= center.y
        point.rotate(angle)
        point.x += center.x
        point.y += center.y