from tkinter import *
from tkinter.colorchooser import *
from tkinter.filedialog import *
win_width=900
win_height=450
class Application(Frame):
def __init__(self,master,bgcolor='#000000'):
super().__init__(master)
self.master=master
self.bgcolor=bgcolor
self.x=0
self.y=0
self.fgcolor="red"
self.lastDraw=0
self.startDrawFlag=False
self.pack()
self.createWiget()
def createWiget(self):
self.drawpad=Canvas(self,width=win_width,height=win_height*0.9,bg=self.bgcolor)
self.drawpad.pack()
#创建按钮
self.btn_start=Button(self.master,text='开始',name='start',)
self.btn_start.pack(side="left",padx=10)
self.btn_pen = Button(self.master, text='画笔', name='pen', )
self.btn_pen.pack(side="left", padx=10)
self.btn_rect = Button(self.master, text='矩形', name='rect', )
self.btn_rect.pack(side="left", padx=10)
self.btn_clear = Button(self.master, text='清空', name='clear', )
self.btn_clear.pack(side="left", padx=10)
self.btn_erasor = Button(self.master, text='橡皮擦', name='erasor', )
self.btn_erasor.pack(side="left", padx=10)
self.btn_line = Button(self.master, text='直线', name='line', )
self.btn_line.pack(side="left", padx=10)
self.btn_lineArrow = Button(self.master, text='箭头直线', name='lineArrow', )
self.btn_lineArrow.pack(side="left", padx=10)
self.btn_color = Button(self.master, text='颜色', name='color', )
self.btn_color.pack(side="left", padx=10)
#事件处理
self.btn_pen.bind_class("Button",'<1>',self.eventManager)
self.drawpad.bind("<ButtonRelease-1>",self.stopDraw)
def eventManager(self,event):
self.name=event.widget.winfo_name()
if self.name=='line':
self.drawpad.bind("<B1-Motion>",self.myline)
def stopDraw(self,event):
self.starDrawFlag=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 lastDraw(self,event):
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.title('我的简易画笔工具')
root.geometry(str(win_width)+"x"+str(win_height)+"+300+400")
app = Application(root)
app.mainloop()

老师,为什么会这样呢,我检查很多遍,感觉没问题