Question

我正在尝试使用kivy创建一个乒乓球游戏。但是，当我尝试在有人得到10分后结束比赛时，我遇到了问题。除了我想使用标签显示Game Over文本之外，一切都运行良好。我创建了一个标签，当前文本设置为空字符串，但是在有人得分足够之后它应该会改变。

我查看了kivy文档并搜索了stackoverflow，但我没有找到答案（或者至少没有找到我理解的答案。）

如果有人能指出我正确的方向，我会非常感激。

这是我的代码：

.py文件：

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


count1 = 0
count2 = 0



class PongPaddle(Widget):
    score = NumericProperty(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):
        global count1
        global count2

        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.player1.score += 1
            count2 = count2 + 1
            self.serve_ball(vel=(4, 0))
        if self.ball.x > self.width:
            self.player2.score += 1
            self.serve_ball(vel=(-4, 0))

        if count1 or count2 >= 10:
            #
            #
            #
            #I don't know what needs to be placed here to change the third label's text


    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()

.kv文件

#:kivy 1.0.9

<PongBall>:
    size: 50, 50
    canvas:
        Ellipse:
            pos: self.pos
            size: self.size

<PongPaddle>:
    size: 25, 200
    canvas:
        Rectangle:
            pos: self.pos
            size: self.size


<PongGame>:
    ball: pong_ball
    player1: player_left
    player2: player_right

    canvas:
        Rectangle:
            pos: self.center_x - 5, 0
            size: 10, self.height

    Label:
        font_size: 70
        center_x: root.width / 4
        top: root.top - 50
        text: str(root.player2.score)

    Label:
        font_size: 70
        center_x: root.width * 3/4
        top: root.top - 50
        text: str(root.player1.score)

    PongBall:
        id: pong_ball
        center: self.parent.center

    PongPaddle:
        id: player_left
        x: root.x
        center_y: root.center_y

    PongPaddle:
        id: player_right
        x: root.width-self.width
        center_y: root.center_y

    Label:
        id: game_over_label
        text: " "
        font_size: 100
        center_x: root.width / 2
        center_y: root.height / 2

Answer 1

您可以使用相同的方法更改游戏而非用于在分数更改时更改分数标签的标签。

如果您在main.py中添加ObjectProperty到PongGame：

end_label = ObjectProperty()

在PongGame下的kv文件中，写一下：

end_label: game_over_label  # linking them up

您可以在main.py中为PongGame类添加一个函数：

def check_score(self):
    scores = [self.player1.score,
              self.player2.score]
    for s in scores:
        if s == 10:
            self.end_label = "Game Over"
            return

然后在update函数中，您可以在分数增加时调用此函数，例如：

 self.player1.score += 1
 self.check_score()

和self.player2.score

相同

Answer 2

在树中找到ID的一种方法是放置一个＆＃34;重定向器＆＃34;在小部件的根目录

在.kv中，在PongGame下：

        gameoverlabel: game_over_label

在.py下的.py如果count1或count2＆gt; = 10：＆＃34;添加

        self.gameoverlabel.text = "win"

希望这有用

更改Kivy小部件文本

2 个答案: