fanchart.py 文件源码

def get_max_width_for_circles(self, rad1, rad2, max_centering_proportion):
        r"""
        (the "r" in the above line is to keep pylint happy)
           __
          /__\ <- compute the line width which is drawable between 2 circles.
         /  _ \   max_centering_proportion : 0, touching the circle1, 1,
        |  |_| |   touching the circle2, 0.5 : middle between the 2 circles
        |      |
         \    /
          \__/
                 basically, max_centering_proportion is
                 max_centering_proportion/nb_lines
        """
        # radius at the center of the 2 circles
        rmid = rad2 - (rad2-rad1)*max_centering_proportion
        return sin(acos(rmid/rad2)) * rad2 * 2