一、代码
#coding=utf-8
"""
开发画图软件
"""
from tkinter import *
win_width=900
win_height=450
class Application(Frame):
def __init__(self, master=None):
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="#000000"
self.fgcolor="#ff0000"
self.x=0
self.y=0
self.lastDraw = 0
self.startDrawFlag = False
self.pack()
self.createWidget()
def createWidget(self):
#创建主菜单栏
self.drawpad=Canvas(root,width=win_width,height=win_height*0.9,bg=self.bgcolor)
self.drawpad.pack()
#创建按钮
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='直线箭头', 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)
btn_pen.bind_class("Butoon","<Button-1>",self.eventManager)
self.drawpad.bind("<ButtonRelease-1>", self.stopDraw)
def eventManager(self,event):
name = event.widget.winfo_name()
print(name)
if name=="line":
self.drawpad.bind("<B1-Motion>",self.myline)
def stopDraw(self,evnet):
self.starDragFlag = False
self.lastDraw = 0
def startDraw(self,event):
self.drawpad.delete(self.lastDraw)
if not self.startDrawFlag:
self.startDrawFlag = True
self.x=event.x
self.y=event.y
def myline(self,event):
self.startDraw(event)
self.lastDraw=self.drawpad.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_height)+"+200+300")
root.title("百战程序员的画图软件")
app = Application(master=root)
root.mainloop()二、问题
老师，我这段代码跟视频里的对了一遍，没好到差别，为什么画直线画不出来，麻烦老师帮忙看一下
![0D`O[0ZRU_H$WD7AV]FAKQP.jpg](/ueditor/php/upload/image/20200218/1581998389144719.jpg "1581998389144719.jpg")
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