python - 在 Kivy 中创建自定义图像类，将 mag_filter 设置为 "nearest"

Question

我在这里做错了什么？我无法让自定义图像类将 mag_filter 设置为“最近”。像素图像非常模糊，单独设置mag_filter很烦人。

这是我的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

“微笑.png”:

Answer 1

您必须通过绑定(bind)纹理来完成此操作，并且在回调中您必须更改纹理，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: