擅长:python、mysql、java
<p>克里斯蒂安的解决方案对我不起作用。
它将在画布之前是这样写的:</p>
<pre><code>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
</code></pre>
<p>关于那件事画布之前以及画布后只能在其他对象中调用以下代码对我有效:</p>
^{pr2}$
<p>资源:</p>
<ul>
<li><a href="https://kivy.org/doc/stable/examples/gen__canvas__rotation__py.html" rel="nofollow noreferrer">https://kivy.org/doc/stable/examples/gen__canvas__rotation__py.html</a></li>
<li><a href="https://github.com/kivy-garden/garden.zbarcam/blob/20171220/zbarcam/zbarcam.kv#L22" rel="nofollow noreferrer">https://github.com/kivy-garden/garden.zbarcam/blob/20171220/zbarcam/zbarcam.kv#L22</a></li>
</ul>