visual.py 文件源码

def draw_background(self, divisions=10):
        """
        Draws the background of the dial

        :param divisions: the number of divisions
        between 'ticks' shown on the dial
        :return: None
        """
        self.canvas.create_arc(2, 2, self.size-2, self.size-2,
                               style=tk.PIESLICE, start=-60, extent=30,
                               fill='red')
        self.canvas.create_arc(2, 2, self.size-2, self.size-2,
                               style=tk.PIESLICE, start=-30, extent=60,
                               fill='yellow')
        self.canvas.create_arc(2, 2, self.size-2, self.size-2,
                               style=tk.PIESLICE, start=30, extent=210,
                               fill='green')

        # find the distance between the center and the inner tick radius
        inner_tick_radius = int(self.size * 0.4)
        outer_tick_radius = int(self.size * 0.5)

        for tick in range(divisions):
            angle_in_radians = (2.0 * cmath.pi / 3.0) \
                               + tick/divisions * (5.0 * cmath.pi / 3.0)
            inner_point = cmath.rect(inner_tick_radius, angle_in_radians)
            outer_point = cmath.rect(outer_tick_radius, angle_in_radians)

            self.canvas.create_line(
                *self.to_absolute(inner_point.real, inner_point.imag),
                *self.to_absolute(outer_point.real, outer_point.imag),
                width=1
            )