python kivy在rectang中添加文本

Question

如何在矩形内添加文本？我使用下面的代码，并在画布内添加了一个标签，希望它能显示在矩形内。在

import kivy
from kivy.app import App
from kivy.uix.anchorlayout import AnchorLayout
from kivy.uix.gridlayout import GridLayout
from kivy.uix.label import Label
from kivy.uix.video import Video
from kivy.uix.relativelayout import RelativeLayout
from kivy.graphics import *

class MyApp(App):
    def build(self):
        r = AnchorLayout()
        f = RelativeLayout()
        g = GridLayout(cols=3, rows=5)
        v = Video(source='driver.mp4', state='play', options={'eos':'loop'})
        l1 = Label(text="jenkins", font_size=32)
        l2 = Label(text="git", font_size=32)
        f.add_widget(v)
        f.add_widget(g)
        g.add_widget(l1)
        g.add_widget(l2)
        with g.canvas:
            Color(.4, .1, .1)
            Rectangle(pos=(100,10), size=(100,100))
            Label(text="KSHK")
        return f

if __name__ == "__main__":
    MyApp().run()

更新： 此文本的颜色不居中对齐

^{pr2}$

Answer 1

将Label与自定义背景色一起使用，然后将其放入布局中。例如：

from kivy.uix.label import Label
from kivy.uix.boxlayout import BoxLayout
from kivy.properties import ListProperty
from kivy.app import App
from kivy.lang import Builder

from random import random

kv = '''
<ColoredLabel>:
    background_color:
    canvas.before:
        Color:
            rgba: self.background_color
        Rectangle:
            pos: self.pos
            size: self.size
'''

Builder.load_string(kv)

class ColoredLabel(Label):
    background_color = ListProperty((0, 0, 0, 1))

class TestApp(App):
    def build(self):
        layout = BoxLayout(size_hint=(1, None), height=50)
        for label in ('a', 'b', 'c', 'd'):
            label = ColoredLabel(text=label, background_color=(random(), random(), random(), 1))
            layout.add_widget(label)

        return layout

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

更新

修复OP的问题：

^{pr2}$

注意，ColoredLabel的Rectange需要有{}和{}来绘制标签实际所在的位置。这就是为什么我在上面的级别上改变了标签本身的大小。画布大小被绑定到它。至于位置，它是由放置ColoredLabel的布局控制的，因此从ColoredLabel类更改它不会有太大的变化。将其与FloatLayout进行比较：

import kivy
from kivy.app import App
from kivy.uix.anchorlayout import AnchorLayout
from kivy.uix.gridlayout import GridLayout
from kivy.uix.label import Label
from kivy.uix.video import Video
from kivy.uix.relativelayout import RelativeLayout
from kivy.graphics import *
from kivy.lang import Builder
from kivy.uix.boxlayout import BoxLayout
from random import random
from kivy.properties import ListProperty

from kivy.uix.floatlayout import FloatLayout


kv = '''
<ColoredLabel>:
    size: (150, 200)
    pos: (50, 150)
    background_color:
    canvas.before:
        Color:
            rgba: self.background_color
        Rectangle:
            pos: self.pos
            size: self.size
    '''

Builder.load_string(kv)

class ColoredLabel(Label):
    background_color = ListProperty((0,0,0,1))

class MyApp(App):
    def build(self):
        f = FloatLayout()
        label = ColoredLabel(text="Hello World!", size_hint=(None, None), background_color=(random(), random(), random(), 1))
        f.add_widget(label)

        return f

if __name__ == "__main__":
    MyApp().run()

在这种情况下，改变ColoredLabel内部的pos实际上有一个效果。在