Kivy 응용 프로그램에서 캔버스 자동 크기 조정

Question

저는 처음 Kivy 응용 프로그램을 파이썬으로 작성했습니다 (지금 kv를 피하고 있습니다). WorldviewWidget이라는 사용자 정의 위젯을 만들었으므로이 패키지를 그리기 장소로 사용하려고합니다. 버튼 위젯을 사용하면 size_hint와 pos_hint를주고, 원하는 위치에 나타납니다. 그러나 위젯을 사용하면 size_hint 및 position_hint를 사용하여 WorldviewWidget에서 드로잉 할 직사각형의 크기를 조절하는 방법을 알 수 없습니다. 여기에 코드가 있습니다. 미리 감사드립니다!

#! /usr/bin/python 
from kivy.app import App 
from kivy.graphics import * 
from kivy.core.window import Window 
from kivy.uix.floatlayout import FloatLayout 
from kivy.uix.widget import Widget 
from kivy.uix.button import Button 


class WorldviewWidget(Widget): 
    def __init__(self, **kwargs): 
     super(WorldviewWidget, self).__init__(**kwargs) 

     self.canvas.clear() 
     print self.size, self.pos 

     with self.canvas: 
      Color(1, 0, 0, 1, mode='rgba') 
      # HELP! I want the rectangle to be resized when the window changes size so that it always takes up the same proportion of the screen. 
      self.rect = Rectangle(size=???, pos=???)  


class JFROCS_App(App): 

    def build(self): 
     Window.clearcolor = [1,1,1,1] 
     parent = FloatLayout(size=Window.size) 

     worldview = WorldviewWidget(size_hint=(0.4, 0.4), pos_hint = {'x':0.2, 'y':0.2}) 
     parent.add_widget(worldview) 


     start_btn = Button(text='Start', size_hint=(0.1, 0.1), pos_hint={'x':.02, 'y':.7}, background_color=[0,1,0,1]) 
     start_btn.bind(on_release=self.start_simulation) 
     parent.add_widget(start_btn) 

     pause_btn = Button(text='Pause', size_hint=(0.1,0.1), pos_hint={'x':.02, 'y':.6}, background_color=[1,1,0,1]) 
     pause_btn.bind(on_release=self.pause_simulation) 
     parent.add_widget(pause_btn) 

     stop_btn = Button(text='Stop', size_hint=(0.1,0.1), pos_hint={'x':.02, 'y':.5}, background_color=[1,0,0,1]) 
     stop_btn.bind(on_release=self.stop_simulation) 
     parent.add_widget(stop_btn) 

     return parent 

    def start_simulation(self, obj): 
     print "You pushed the start button!" 
    def pause_simulation(self, obj): 
     print "You pushed the pause button!" 
    def stop_simulation(self, obj): 
     print "You pushed the stop button!" 

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

Answer 1

나는이 종류의 작업이 kivy-language에 대해 예정되어 있다고 생각하지만 여기에는 파이썬의 해결책이있다. 기본적으로 위젯이 부모의 size에서 변경 사항을 수신하도록하기 위해 bind -method를 사용했습니다. 이 메커니즘에 대한 자세한 내용은 this을 참조하십시오.

from kivy.app import App 
from kivy.graphics import * 
from kivy.core.window import Window 
from kivy.uix.floatlayout import FloatLayout 
from kivy.uix.widget import Widget 
from kivy.uix.button import Button 


class WorldviewWidget(Widget): 
    def __init__(self, **kwargs): 
     super(WorldviewWidget, self).__init__(**kwargs) 

     self.canvas.clear() 
     print self.size, self.pos 

     with self.canvas: 
      Color(1, 0, 0, 1, mode='rgba') 
      # *changed* ############################################## 
      self.rect = Rectangle(size=self.size, pos=self.pos)  

    # *new* ########################################################## 
    def update_size(self, instance, new_size): 
     print "UPDATING SIZE", instance, new_size 
     self.size[0] = new_size[0] * 0.4 
     self.size[1] = new_size[1] * 0.4 
     self.rect.size = self.size 
     self.pos[0] = self.parent.size[0] * 0.2 
     self.pos[1] = self.parent.size[1] * 0.2 
     self.rect.pos = self.pos 

class JFROCS_App(App): 

    def build(self): 
     Window.clearcolor = [1,1,1,1] 
     parent = FloatLayout(size=Window.size) 

     # *changed* ################################################## 
     worldview = WorldviewWidget(size=(0.4*parent.size[0], 0.4*parent.size[1]), 
            pos=(0.2*parent.size[0], 0.2*parent.size[1])) 
     # makes sure that the widget gets updated when parent's size changes: 
     parent.bind(size=worldview.update_size) 
     parent.add_widget(worldview) 


     start_btn = Button(text='Start', size_hint=(0.1, 0.1), pos_hint={'x':.02, 'y':.7}, background_color=[0,1,0,1]) 
     start_btn.bind(on_release=self.start_simulation) 
     parent.add_widget(start_btn) 

     pause_btn = Button(text='Pause', size_hint=(0.1,0.1), pos_hint={'x':.02, 'y':.6}, background_color=[1,1,0,1]) 
     pause_btn.bind(on_release=self.pause_simulation) 
     parent.add_widget(pause_btn) 

     stop_btn = Button(text='Stop', size_hint=(0.1,0.1), pos_hint={'x':.02, 'y':.5}, background_color=[1,0,0,1]) 
     stop_btn.bind(on_release=self.stop_simulation) 
     parent.add_widget(stop_btn) 

     return parent 

    def start_simulation(self, obj): 
     print "You pushed the start button!" 
    def pause_simulation(self, obj): 
     print "You pushed the pause button!" 
    def stop_simulation(self, obj): 
     print "You pushed the stop button!" 

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

그리고 kivy 언어를 보라 - 그것은 모두 당신을 위해 바인딩 :