Rotate

def rotate(coordinates,angle):
    #get the coordinates to local variables so its easyer to see whats going on
    x = coordinates['x']
    y = coordinates['y']
    X = x * math.cos(angle) - y * math.sin(angle)
    Y = x * math.sin(angle) + y * math.cos(angle)
    return {'x':X,'y':Y}