矩形設置為MyPaintWidget的大小，在父小部件上以默認大小繪制。如果MyPaintWidget是根小部件，那么設置self.size將允許它占用整個窗口空間。(請注意，當前結構只會在on-touch-down事件上調整畫布的大小。因此，如果調整窗口大小，則需要單擊以調整圖像大小。)#Change MyPaintApp to the following...

class MyPaintApp(App):

def build(self):

return MyPaintWidget()

您還可以創建一個單獨的小部件來保存背景。下面我添加了一個MyBackground小部件，它用于背景，當屏幕大小改變時，它將調整大小。還有其他幾種方法可以做到這一點。from random import random

from kivy.app import App

from kivy.uix.button import Button

from kivy.uix.widget import Widget

from kivy.graphics import Color, Line, Rectangle

from kivy.uix.filechooser import FileChooserListView, FileChooserIconView

from kivy.uix.floatlayout import FloatLayout

from kivy.uix.image import Image

class MyBackground(Widget):

def __init__(self, **kwargs):

super(MyBackground, self).__init__(**kwargs)

with self.canvas:

self.bg = Rectangle(source='water.png', pos=self.pos, size=self.size)

self.bind(pos=self.update_bg)

self.bind(size=self.update_bg)

def update_bg(self, *args):

self.bg.pos = self.pos

self.bg.size = self.size

class MyPaintWidget(Widget):

def on_touch_down(self, touch):

color = (random(), random(), random())

with self.canvas:

Color(*color)

d = 30.

touch.ud['line'] = Line(points=(touch.x, touch.y))

def on_touch_move(self, touch):

touch.ud['line'].points += [touch.x, touch.y]

class MyPaintApp(App):

def build(self):

parent = MyBackground()

painter = MyPaintWidget()

parent.add_widget(painter)

return parent

if __name__ == '__main__':

MyPaintApp().run()

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