Python 在Kivy中创建自定义图像类，将mag_过滤器设置为；最近的；

我做错了什么？我无法让我的自定义图像类将mag_过滤器设置为“最近”。像素图像非常模糊，单独设置mag_过滤器很烦人

下面是我的Python：

#test2.py
import kivy
kivy.require("1.10.0")
from kivy.app import App
from kivy.lang import Builder
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.image import Image

class Container(BoxLayout):
    pass

class CustomImage(Image):
    def build(self):
        #self.ids.img.texture.mag_filter = 'nearest'   #doesn't work
        #self.img.texture.mag_filter = 'nearest'       #doesn't work
        self.texture.mag_filter = 'nearest'            #doesn't work
        #texture.mag_filter = 'nearest'                #doesn't work

class TestName(App):
    def build(self):
        global root
        Builder.load_file("picTest.kv")
        root = Container()
        return root

### Keep everything below this last! ###
if __name__ == '__main__':
    TestName().run()

这是相应的Kivy文件

#picTest.kv
Container:

#Container holds all the other layouts
<Container>:
    id: contain
    CustomImage:
        source: "smile.png"
    CustomImage:
        source: "smile.png"
    CustomImage:
        source: "smile.png"

<CustomImage>:
    id: img
    allow_stretch: True

#picTest.kv
容器：
#容器包含所有其他布局
:
id:包含
自定义图像：
资料来源：“smile.png”
自定义图像：
资料来源：“smile.png”
自定义图像：
资料来源：“smile.png”
:
id:img
允许拉伸：真

“smile.png”：

---

您必须通过绑定纹理来完成此操作，并且在回调中必须更改纹理，此连接必须在构造函数中完成

#test2.py
import kivy
kivy.require("1.10.0")
from kivy.app import App
from kivy.lang import Builder
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.image import Image

class Container(BoxLayout):
    pass

class CustomImage(Image):
    def __init__(self, *args, **kwargs):
        Image.__init__(self, *args, **kwargs)
        self.bind(texture=self._update_texture_filters)

    def _update_texture_filters(self, image, texture):
        texture.mag_filter = 'nearest'

class TestName(App):
    def build(self):
        Builder.load_file("picTest.kv")
        root = Container()
        return root

### Keep everything below this last! ###
if __name__ == '__main__':
    TestName().run()

之前：

之后：