def _render()

in gym/gym/envs/box2d/lunar_lander.py [0:0]
35 lines of code
11 McCabe index (conditional complexity)

    def _render(self, mode='human', close=False):
        if close:
            if self.viewer is not None:
                self.viewer.close()
                self.viewer = None
            return

        from gym.envs.classic_control import rendering
        if self.viewer is None:
            self.viewer = rendering.Viewer(VIEWPORT_W, VIEWPORT_H)
            self.viewer.set_bounds(0, VIEWPORT_W/SCALE, 0, VIEWPORT_H/SCALE)

        for obj in self.particles:
            obj.ttl -= 0.15
            obj.color1 = (max(0.2,0.2+obj.ttl), max(0.2,0.5*obj.ttl), max(0.2,0.5*obj.ttl))
            obj.color2 = (max(0.2,0.2+obj.ttl), max(0.2,0.5*obj.ttl), max(0.2,0.5*obj.ttl))

        self._clean_particles(False)

        for p in self.sky_polys:
            self.viewer.draw_polygon(p, color=(0,0,0))

        for obj in self.particles + self.drawlist:
            for f in obj.fixtures:
                trans = f.body.transform
                if type(f.shape) is circleShape:
                    t = rendering.Transform(translation=trans*f.shape.pos)
                    self.viewer.draw_circle(f.shape.radius, 20, color=obj.color1).add_attr(t)
                    self.viewer.draw_circle(f.shape.radius, 20, color=obj.color2, filled=False, linewidth=2).add_attr(t)
                else:
                    path = [trans*v for v in f.shape.vertices]
                    self.viewer.draw_polygon(path, color=obj.color1)
                    path.append(path[0])
                    self.viewer.draw_polyline(path, color=obj.color2, linewidth=2)

        for x in [self.helipad_x1, self.helipad_x2]:
            flagy1 = self.helipad_y
            flagy2 = flagy1 + 50/SCALE
            self.viewer.draw_polyline( [(x, flagy1), (x, flagy2)], color=(1,1,1) )
            self.viewer.draw_polygon( [(x, flagy2), (x, flagy2-10/SCALE), (x+25/SCALE, flagy2-5/SCALE)], color=(0.8,0.8,0) )

        return self.viewer.render(return_rgb_array = mode=='rgb_array')