zoom.py 文件源码

def get_width_height(self, extent):
        """
        Returns the width and height for the given extent.
        """
        # Getting the lower-left, upper-left, and upper-right
        # coordinates from the extent.
        ll = Point(extent[:2])
        ul = Point(extent[0], extent[3])
        ur = Point(extent[2:])
        # Calculating the width and height.
        height = ll.distance(ul)
        width = ul.distance(ur)
        return width, height