编辑代码

# coding:utf-8
#JSRUN引擎2.0,支持多达30种语言在线运行,全仿真在线交互输入输出。 
from tkinter import *
from tkinter.filedialog import *
from tkinter.colorchooser import *

win_width=900
win_heigth=450

class Application(Frame):

    def __init__(self, master=None,bgcolor='#000000',fgcolor='#ff0000'):
        super().__init__(master) # super()代表的是父类的定义,而不是父类对象
        self.master = master
        self.bgcolor = bgcolor
        self.fgcolor = fgcolor
        self.pack()
        self.createWidget()
        self.x=0
        self.y=0

    def createWidget(self):
        self.canvas=Canvas(self,width=win_width,height=win_heigth*0.9,bg=self.bgcolor)
        self.canvas.pack()

        btn_start = Button(root,text="开始",name="start")
        btn_start.pack(side="left",padx="10")
        btn_pen = Button(root,text="画笔",name="pen")
        btn_pen.pack(side="left",padx="10")
        btn_rect = Button(root,text="矩形",name="rect")
        btn_rect.pack(side="left",padx="10")
        btn_clear = Button(root,text="清屏",name="clear")
        btn_clear.pack(side="left",padx="10")
        btn_erasor = Button(root,text="橡皮擦",name="erasor")
        btn_erasor.pack(side="left",padx="10")
        btn_line = Button(root,text="直线",name="line")
        btn_line.pack(side="left",padx="10")
        btn_lineArrow = Button(root,text="箭头直线",name="lineArrow")
        btn_lineArrow.pack(side="left",padx="10")
        btn_color = Button(root,text="颜色",name="color")
        btn_color.pack(side="left",padx="10")

    def eventManager(self,event):#发生的全部事件包装成一个对象放入event里
        event_name=event.widget.winfo_name()
        print(event_name)
        if event_name == 'line':
            self.canvas.bind('<Button-1>',self.myline)


    def myline(self,event):
        self.canvas.create_line(self.x,self.y,event.x,event.y,fill=self.fgcolor)


if __name__ == '__main__':
    root = Tk()
    root.geometry(str(win_width)+"x"+str(win_heigth)+"+200+300")
    root.title("百战程序员的简易记事本")
    app = Application(master=root)
    root.mainloop()