Question

我是python和kivy的新手。我一直在尝试用Python开发一个简单的Pong游戏。一切顺利，直到我试图整理菜单。我使用ScreenManager尝试浏览两个屏幕。但是当我按下按钮时，没有任何反应。每个答案或想法都很受欢迎！

这是我的.py代码：

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
import pygame 
from kivy.uix.button import Button
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.uix.gridlayout import GridLayout
from kivy.lang import Builder


class Menu(GridLayout,Screen):

def __init__(self, **kwargs):
    super(Menu, self).__init__(**kwargs)
pass

class PongSpadi(Widget):
stig = NumericProperty(0)

def skoppa_bolti(self, bolti):
    if self.collide_widget(bolti):
        vx, vy = bolti.velocity
        offset = (bolti.center_y - self.center_y) / (self.height / 2)
        skoppadur = Vector(-1 * vx, vy)
        vel = skoppadur
        bolti.velocity = vel.x, vel.y + offset

class PongBolti(Widget):
velocity_x = NumericProperty(0)
velocity_y = NumericProperty(100)
velocity = ReferenceListProperty(velocity_x, velocity_y)


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


class PongGame(Screen, Widget):
bolti = ObjectProperty(None)
spilari1 = ObjectProperty(None)
spilari2 = ObjectProperty(None)
h1 = NumericProperty(310)
h2 = NumericProperty(310)


def serve_bolti(self, vel=(12, 6)):

    self.bolti.center = self.center #Staðsetur boltann í miðjuna
    self.bolti.velocity = vel

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

    self.spilari1.skoppa_bolti(self.bolti) #skoppar bolta af spöðum
    self.spilari2.skoppa_bolti(self.bolti)

    if (self.bolti.y < 0) or (self.bolti.top > self.height):
            self.bolti.velocity_y *= -1 #Lætur boltan skoppa ef hann snertir vegginn uppi/niðri


    if self.bolti.x <self.x: 
        self.spilari2.stig += 1 #skráir stig ef bolti fer í hliðarnar
        self.serve_bolti(vel= (12,6)) #byrjar nýtt uppkast    
    if self.bolti.x > self.width:
        self.spilari1.stig += 1
        self.serve_bolti(vel = (-12,6))

    keys = pygame.key.get_pressed()  #Takka stjórnun fyrir leikmann 1
    if self.h1 < 567: #Bannar spaða 1 að fara of hátt
        if self.h1 > 25: #Bannar spaða 1 að fara of látt
            if keys[pygame.K_z]: #býr til takka fyrir spaða 1
                self.h1 -= 10
            elif keys[pygame.K_a]:
                self.h1 += 10
        if self.h1 >= 567: #ýtir honum til baka ef farið er of hátt
            self.h1 -= 10
        if self.h1 <= 25: #ýtir honum til baka ef farið er of látt
            self.h1 += 10

    keys = pygame.key.get_pressed() #takka stjórnun fyrir leikmann 2
    if self.h2 < 567:   
        if self.h2 > 25:
            if keys[pygame.K_m]:
                self.h2 -= 10
            elif keys[pygame.K_k]:
                self.h2 += 10
        if self.h2 >= 567: #ýtir honum til baka ef farið er of hátt
            self.h2 -= 10
        if self.h2 <= 25: #ýtir honum til baka ef farið er of látt
            self.h2 += 10
    pass

sm = ScreenManager()
sm.add_widget(Menu(name='menu'))
sm.add_widget(PongGame(name='ponggame'))       

class PongApp(App): #ræsir forritið
title = "Menu"
def build(self):    #kallar á eiginleika leiksins
    sm = Menu()
    return sm

    sm = PongGame()
    sm.serve_bolti()   #kallar á uppkast boltans
    Clock.schedule_interval(sm.update, 1.0 / 60) #Lætur leikinn uppfærast 60 sinnum á sekúndu.
    return sm



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

这是我的.kv代码：

#: kivy 1.9.1

ScreenManager:
    Menu:
    PongGame:

<Menu>
    name: 'menu'

Button:
    on_press: app.root.current = 'ponggame'
    on_press: print("virkar")
    text: "Manneskja á móti manneskju"
    font_size: 20
    center_x: root.width / 2
    top: root.top / 1.5
    size: 275, 50

Label: #nafn á leik
    font_size: 100
    center_x: root.width / 2
    top: root.top - 50
    text: 'Pong og Gervigreind'

Label:
    font_size: 20
    center_x: root.width / 2
    top: root.top -120
    text: 'Lokaverkefni eftir Hróbjart Höskuldsson vor 2018'





<PongBolti>:
size: 20, 20
canvas: 
    Rectangle:
        pos: self.pos
        size: self.size

<PongSpadi>:
size: 23, 100
canvas:
    Rectangle:
        pos:self.pos
        size:self.size      



<PongGame>:  
name: 'ponggame'

bolti: pong_bolti
spilari1: spilari_vinstri
spilari2: spilari_haegri

canvas:
    Rectangle:
        pos: self.center_x - 5, 0
        size: 3, self.height

Label:  # staða leikmanns 1
    font_size: 70  
    center_x: root.width / 4
    top: root.top - 50
    text: str(root.spilari1.stig)

Label:  # staða leikmanns 2
    font_size: 70  
    center_x: root.width * 3 / 4
    top: root.top - 50
    text: str(root.spilari2.stig)

PongBolti:
    id: pong_bolti
    center: self.parent.center

PongSpadi:
    id: spilari_vinstri
    x: root.x + 30
    center_y: root.h1

PongSpadi:
    id: spilari_haegri
    x: root.width-self.width - 30
    center_y: root.h2

Button:
    on_release: app.root.current = 'menu'
    on_press: print("virkar")
    text: "Manneskja á móti manneskju"
    font_size: 20
    center_x: root.width / 2
    top: root.top / 1.5
    size: 275, 50

Answer 1

这不是一个完整的答案，而是一些让你感动的想法：

您的build()方法应返回ScreenManager。我认为它应该是这样的：

def build(self):    #kallar á eiginleika leiksins
    sm = ScreenManager()
    sm.add_widget(Menu())
    sm.add_widget(PongGame())
    return sm

您的PongGame不需要展开{{1}}（Widget是一个小工具）
您的Screen课程不需要同时延伸Menu和Screen。只需在GridLayout中使用GridLayout，就像这样：
```
Menu
```
您的<Menu> name: 'menu' GridLayout: rows: 3 Button: on_press: app.root.current = 'ponggame' on_press: print("virkar") text: "Manneskja á móti manneskju" font_size: 20 center_x: root.width / 2 top: root.top / 1.5 size: 275, 50 Label: #nafn á leik font_size: 100 center_x: root.width / 2 top: root.top - 50 text: 'Pong og Gervigreind' Label: font_size: 20 center_x: root.width / 2 top: root.top -120 text: 'Lokaverkefni eftir Hróbjart Höskuldsson vor 2018'方法中的代码看起来可能正在启动游戏。我认为在build()的{{1}}方法中可能会更好。

Kivy ScreenManager不会切换屏幕

1 个答案: