kivy 画图实例_kivy实例

from kivy.app import App
from kivy.graphics import Line, Color
from kivy.uix.widget import Widget
from kivy.core.text import LabelBase
from kivy.utils import get_color_from_hex
 
 
get_color_from_hex("#19cadd")
LabelBase.register("Roboto", "HelloKitty.TTF")
 
 
class DrawCanvasWidget(Widget):
    def __init__(self,**kwargs):
        super(DrawCanvasWidget, self).__init__(**kwargs)
        # 设置默认值
        self.change_color(get_color_from_hex("#19caad"))
        self.canvas.add(Color(rgb=[0, 0, 0]))
        self.line_width = 2
 
    def on_touch_down(self, touch):
        """触摸显示轨迹"""
        if Widget.on_touch_down(self, touch):
            return
        with self.canvas:
            touch.ud["current_line"] = Line(points=(touch.x, touch.y), width=self.line_width)
 
    def on_touch_move(self, touch):
        """连线"""
        if "current_line" in touch.ud: