更改Kivy小部件文本 [英] Changing a Kivy Widget Text

问题描述

我正在尝试使用kivy创建一个乒乓游戏.但是，当我尝试在某人获得10分后结束游戏时遇到了问题.一切工作正常，除了我想使用标签显示游戏结束"文本.我创建了一个标签，当前文本设置为一个空字符串，但是当有人获得足够的分数后，它应该会更改.

I am attempting to create a pong game using kivy. However, I am running into issues when I try to end a game after someone scores 10 points. Everything is working well except that I would like to show a Game Over text using a label. I created a label and currently the text is set to an empty string, but it should change after someone scores enough points.

我浏览了kivy文档并搜索了stackoverflow，但没有找到答案(或者至少没有一个我了解的答案)

I have looked through the kivy documentation and searched stackoverflow but I have not found an answer for this(or at least not one that I understand.)

如果有人可以指出正确的方向，我将非常感激.

If someone can point me in the right direction I would really appreciate it.

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

推荐答案

您将使用与更改得分时更改得分标签相同的方法来更改游戏结束标签.

You would use the same method to change the game over label that you use to change the score labels when the score changes.

如果在main.py中将ObjectProperty添加到PongGame:

If you add an ObjectProperty to PongGame in main.py:

end_label = ObjectProperty()

在PongGame下的kv文件中，输入:

And in your kv file under PongGame, write:

end_label: game_over_label  # linking them up

您可以在main.py中的PongGame类中添加一个函数:

You could add a function to PongGame class in main.py:

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

然后在您的update函数中，只要分数增加，就可以调用此函数，例如:

Then in your update function, you could call this function any time the scores are incremented, for instance:

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

和self.player2.score

这篇关于更改Kivy小部件文本的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！