Kivy相机显示屏旋转-90度 [英] Kivy Camera display is rotated -90 degrees

问题描述

我正在使用带有kivy框架的python访问android 4.4中的相机.

I am accessing my camera in android 4.4 using python with kivy framework.

这是我的简单代码:

from kivy.app import App
from kivy.uix.camera import Camera
from kivy.core.window import Window

class CamApp(App):
    def build(self):
        return Camera(resolution= Window.size)

CamApp().run()

但是当我运行我的代码时，它显示如下:

But when I ran my code, it displayed this:

理想情况下，它看起来应该像这样:

Ideally, it should look like this:

看起来像kivy相机正在以-90度内置显示输出.这是正常现象还是错误?还是我应该自己旋转显示器?

It looks like the kivy Camera is displaying the output with a built in -90 degrees. Is this normal or a bug? Or should I rotate the display myself?

推荐答案

Cristian的解决方案不适用于我. 它将在写入canvas.before的行上引发一个Parser异常:

The Solution from Cristian does not work for me. It will throw an Parser Exception at the line where canvas.before is written:

kivy.lang.parser.ParserException: Parser: File "<inline>", line 21:
I python  :  ...
I python  :       19:        height: '48dp'
I python  :       20:        on_press: root.capture()
I python  :  >>   21:    canvas.before:
I python  :       22:        PushMatrix
I python  :       23:        Rotate:
I python  :  ...
I python  :  Invalid class name

关于canvas.before和canvas.after只能在其他对象中调用，以下代码对我有用:

With regards that the canvas.before and canvas.after can only be called within other Objects the following Code is working for me:

from kivy.app import App
from kivy.lang import Builder
from kivy.uix.boxlayout import BoxLayout
import time
Builder.load_string('''
<CameraClick>:
    orientation: 'vertical'
    Camera:
        id: camera
        resolution: (640, 480)
        play: False
        canvas.before:
            PushMatrix
            Rotate:
                angle: -90
                origin: self.center
        canvas.after:
            PopMatrix
    ToggleButton:
        text: 'Play'
        on_press: camera.play = not camera.play
        size_hint_y: None
        height: '48dp'
    Button:
        text: 'Capture'
        size_hint_y: None
        height: '48dp'
        on_press: root.capture()
''')


class CameraClick(BoxLayout):
    def capture(self):
        '''
        Function to capture the images and give them the names
        according to their captured time and date.
        '''
        camera = self.ids['camera']
        timestr = time.strftime("%Y%m%d_%H%M%S")
        camera.export_to_png("IMG_{}.png".format(timestr))
        print("Captured")


class TestCamera(App):

    def build(self):
        return CameraClick()


TestCamera().run()

资源:

• https://kivy.org/doc/stable/examples/gen__canvas__rotation__py.html
• https://github.com /kivy-garden/garden.zbarcam/blob/20171220/zbarcam/zbarcam.kv#L22

• https://kivy.org/doc/stable/examples/gen__canvas__rotation__py.html
• https://github.com/kivy-garden/garden.zbarcam/blob/20171220/zbarcam/zbarcam.kv#L22

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