pdf.py 文件源码

def mergeRotatedScaledPage(self, page2, rotation, scale, expand=False):
        """
        This is similar to mergePage, but the stream to be merged is rotated
        and scaled by appling a transformation matrix.

        :param PageObject page2: the page to be merged into this one. Should be
            an instance of :class:`PageObject<PageObject>`.
        :param float rotation: The angle of the rotation, in degrees
        :param float scale: The scaling factor
        :param bool expand: Whether the page should be expanded to fit the
            dimensions of the page to be merged.
        """
        rotation = math.radians(rotation)
        rotating = [[math.cos(rotation), math.sin(rotation), 0],
                    [-math.sin(rotation), math.cos(rotation), 0],
                    [0,                  0,                  1]]
        scaling = [[scale, 0,    0],
                   [0,    scale, 0],
                   [0,    0,    1]]
        ctm = utils.matrixMultiply(rotating, scaling)

        return self.mergeTransformedPage(page2,
                                         [ctm[0][0], ctm[0][1],
                                          ctm[1][0], ctm[1][1],
                                          ctm[2][0], ctm[2][1]], expand)