copyfrom ursina import * app = Ursina() window.color = color.black camera.orthographic = True camera.fov = 1 left_paddle = Entity(scale=(1/32,6/32), x=-.75, model='quad', origin_x=.5, collider='box') right_paddle = duplicate(left_paddle, x=left_paddle.x*-1, rotation_z=left_paddle.rotation_z+180) floor = Entity(model='quad', y=-.5, origin_y=.5, collider='box', scale=(2,10), visible=False) ceiling = duplicate(floor, y=.5, rotation_z=180, visible=False) left_wall = duplicate(floor, x=-.5*window.aspect_ratio, rotation_z=90, visible=True) right_wall = duplicate(floor, x=.5*window.aspect_ratio, rotation_z=-90, visible=True) collision_cooldown = .15 ball = Entity(model='circle', scale=.05, collider='box', speed=0, collision_cooldown=collision_cooldown) def update(): ball.collision_cooldown -= time.dt ball.position += ball.right * time.dt * ball.speed left_paddle.y += (held_keys['w'] - held_keys['s']) * time.dt * 1 right_paddle.y += (held_keys['up arrow'] - held_keys['down arrow']) * time.dt * 1 if ball.collision_cooldown > 0: # after a collision, wait a little while before another collision can occur. # this is to prevent the ball from colliding multiple times with the same wall because # it hasn't got time to be moved away from it yet. return hit_info = ball.intersects() if hit_info.hit: ball.collision_cooldown = collision_cooldown if hit_info.entity in (left_paddle, right_paddle, left_wall, right_wall): hit_info.entity.collision = False invoke(setattr, hit_info.entity, 'collision', False, delay=.1) direction_multiplier = 1 if hit_info.entity == left_paddle: direction_multiplier = -1 left_paddle.collision = False # disable collision for the current paddle so it doesn't collide twice in a row right_paddle.collision = True else: right_paddle.collision = False left_paddle.collision = True ball.rotation_z += 180 * direction_multiplier ball.rotation_z -= (hit_info.entity.world_y - ball.y) * 20 * 32 * direction_multiplier ball.speed *= 1.1 else: # hit wall ball.rotation_z *= -abs(hit_info.world_normal.normalized()[1]) # create a particle on collision particle = Entity(model='quad', position=hit_info.world_point, scale=0, texture='circle', add_to_scene_entities=False) particle.animate_scale(.2, .5, curve=curve.out_expo) particle.animate_color(color.clear, duration=.5, curve=curve.out_expo) destroy(particle, delay=.5) def reset(): ball.position = (0,0,0) ball.rotation = (0,0,0) ball.speed = 10 for paddle in (left_paddle, right_paddle): paddle.collision = True paddle.y = 0 info_text = Text("press space to play", y=-.45) def input(key): if key == 'space': info_text.enabled = False reset() if key == 't': ball.speed += 5 # TODO: register when the ball exits either side and give points app.run()