transform.py 文件源码

def rotate(self, angle):
        """Return a new transformation, rotated by 'angle' (radians).

        Example:
            >>> import math
            >>> t = Transform()
            >>> t.rotate(math.pi / 2)
            <Transform [0 1 -1 0 0 0]>
            >>>
        """
        import math
        c = _normSinCos(math.cos(angle))
        s = _normSinCos(math.sin(angle))
        return self.transform((c, s, -s, c, 0, 0))