用python+kivy实现简易的电子白板功能

from kivy.uix.behaviors import ToggleButtonBehavior from kivy.uix.togglebutton import ToggleButton from kivy.app import App from kivy.graphics import Line, Color from kivy.uix.widget import Widget class FrameToggleButton(ToggleButton): # 当前按钮添加边框 def do_press(self): # 点击改变状态 if self.state == 'normal': ToggleButtonBehavior.do_press(self) class DrawCanvasWidget(Widget): def __init__(self, **kwargs): super().__init__(**kwargs) # set default color 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: touch.ud['current_line'].points += (touch.x, touch.y) def change_color(self, new_color): # 调色 self.last_color = new_color self.canvas.add(Color(*new_color)) def change_line_width(self, line_width='Normal'): # 线宽 self.line_width = {'Thin': 1, 'Normal': 2, 'Thick': 4}[line_width] def clear_canvas(self): # 清屏 saved = self.children[:] self.clear_widgets() self.canvas.clear() for widget in saved: self.add_widget(widget) self.change_color(self.last_color) class PaintApp(App): def build(self): self.draw_canvas_widget = DrawCanvasWidget() return self.draw_canvas_widget if __name__ == '__main__': pa = PaintApp() pa.run()