时间戳

首页 > 解决方案 > 用自定义宽度动画 Kivy Bezier 曲线？（有点傻的问题）

python - 用自定义宽度动画 Kivy Bezier 曲线？（有点傻的问题）

问题描述

标签： pythonuser-interfacekivybezier

解决方案

The Bezier has no width property, but the Line does. So you can animate that width. An easy way to do that is by animating a NumericProperty that holds the width. Here is a modified version of your code that does that:

from kivy.animation import Animation
from kivy.app import App
from kivy.clock import Clock
from kivy.properties import NumericProperty
from kivy.uix.widget import Widget
from kivy.graphics import *

class MyLayout(Widget):
    line_width = NumericProperty(12)
    def __init__(self):
        super(MyLayout, self).__init__()
        with self.canvas:
            self.L=Bezier(points=[200,450,500,300,600,150],width=self.line_width)
            self.k=Line  (bezier=[100,350,400,200,500,50 ],width=self.line_width)

    def on_line_width(self, instance, new_width):
        self.k.width = new_width

class MyApp(App):

    def build(self):
        Clock.schedule_once(self.anim)
        return MyLayout()

    def anim(self, dt):
        a = Animation(line_width=3)
        a.start(self.root)

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

If you build the Line in kv, then you don't even need the on_line_width() method since kivy will do the binding for you.

推荐阅读