Question

在kivy pong教程中有完整的代码，我在我的电脑上运行，它的工作非常好，但是如果在球拍边缘击球显示疯狂的动作。我不确定发生了什么。我尝试多次观察它并且我认为球在桨内碰撞很多次因此速度保持增加X1.1这转而导致随机运动。但是我怎样才能让它发挥作用呢？我尝试改变时钟功能时间但没有结果。假设是碰撞检查方法，但后来我无法做到。有什么帮助吗？

代码（我没有附上.kv文件，我不认为这里是必需的）：

from kivy.app import App
from kivy.uix.widget import Widget
from kivy.properties import NumericProperty, ReferenceListProperty,\
    ObjectProperty
from kivy.vector import Vector
from kivy.clock import Clock

class PongPaddle(Widget):
    score = NumericProperty(0)
    orientation = ObjectProperty([0, 0])

    def bounce_ball(self, ball):
        if self.collide_widget(ball) :
                vx, vy = ball.velocity
                offset = (ball.center_y - self.center_y) / (self.height / 2)
                bounced = Vector(-1 * vx, vy)
                vel = bounced * 1.1
                ball.velocity = vel.x, vel.y + offset

class PongBall(Widget):
    velocity_x = NumericProperty(0)
    velocity_y = NumericProperty(0)
    velocity = ReferenceListProperty(velocity_x, velocity_y)

    def move(self):
        self.pos = Vector(*self.velocity) + self.pos


class PongGame(Widget):
    ball = ObjectProperty(None)
    player1 = ObjectProperty(None)
    player2 = ObjectProperty(None)

    def serve_ball(self, vel=(4, 0)):
        self.ball.center = self.center
        self.ball.velocity = vel

    def update(self, dt):
        self.ball.move()

        #bounce of paddles
        self.player1.bounce_ball(self.ball)
        self.player2.bounce_ball(self.ball)

        #bounce ball off bottom or top
        if (self.ball.y < self.y) or (self.ball.top > self.top):
            self.ball.velocity_y *= -1

        #went of to a side to score point?
        if self.ball.x < self.x:
            self.player2.score += 1
            self.serve_ball(vel=(4, 0))
        if self.ball.x > self.width:
            self.player1.score += 1
            self.serve_ball(vel=(-4, 0))




    def on_touch_move(self, touch):
        if touch.x < self.width / 3:
            self.player1.center_y = touch.y
        if touch.x > self.width - self.width / 3:
            self.player2.center_y = touch.y


class PongApp(App):
    def build(self):
        game = PongGame()
        game.serve_ball()
        Clock.schedule_interval(game.update, 1.0 / 60.0)
        return game


if __name__ == '__main__':
    PongApp().run()

Answer 1

例如，您可以跟踪自上次碰撞以来球是否已离开球拍。如果有，则正常应用新碰撞。如果它没有，则不应用任何新的碰撞，直到它有。

在桨的末端击球显示随机运动

1 个答案: