python基于tkinter写的画图项目分析

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# coding=utf-8 from tkinter import * from tkinter.filedialog import * from tkinter.colorchooser import * win_width=900   #定义全局变量 win_height=450  #定义全局变量 class AppLication(Frame):     #初始化区     def __init__(self,master=None,bg="#000000"):         super().__init__(master)         self.master=master         self.x=0         self.y=0         self.pack()         self.bg=bg         self.fgcolor="#ff0000"         self.lastdraw=0         self.startdrawflag=False         self.CreateWidget()     #创建控件     def CreateWidget(self):         #创建画布         self.drawpad=Canvas(root,bg=self.bg,width=win_width,height=win_height)         self.drawpad.pack()         #创建按钮         btnstart=Button(root,text="开始",name='start')         btnstart.pack(side="left",padx=10)         btnpen=Button(root,text="画笔",name='pen')         btnpen.pack(side="left",padx=10)         btnrect=Button(root,text="画矩形",name='rect')         btnrect.pack(side="left",padx=10)         btnclear=Button(root,text="清屏",name='clear')         btnclear.pack(side="left",padx=10)         btneraser=Button(root,text="橡皮擦",name='eraser')         btneraser.pack(side="left",padx=10)         btnline=Button(root,text="直线",name='line')         btnline.pack(side="left",padx=10)         btnlineraw=Button(root,text="直线(箭头)",name='lineraw')         btnlineraw.pack(side="left",padx=10)         btncolor=Button(root,text="颜色",name='color')         btncolor.pack(side="left",padx=10)         #绑定事件处理         btnpen.bind_class("Button","<1>",self.eventManager)         self.drawpad.bind("<ButtonRelease-1>",self.stopDraw)         #绑定键盘快捷键         root.bind("<KeyPress-g>",self.kuaijiejian)         root.bind("<KeyPress-b>",self.kuaijiejian)     def eventManager(self,event):         name=event.widget.winfo_name()         print(name)         if name=='line':             self.drawpad.bind("<B1-Motion>",self.linecreate)         elif name=='lineraw':             self.drawpad.bind("<B1-Motion>",self.lineArrow)         elif name=="rect":             self.drawpad.bind("<B1-Motion>",self.rect)         elif name=="pen":             self.drawpad.bind("<B1-Motion>",self.pen)         elif name=='eraser':             self.drawpad.bind("<B1-Motion>",self.eraser)         elif name=='clear':             self.drawpad.delete("all")         elif name=='color':             s1=askcolor(title="选择颜色",color=self.fgcolor)             self.fgcolor=s1[1]     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 stopDraw(self,event):         self.startdrawflag=False         self.lastdraw=0     def linecreate(self,event):         self.startDraw(event)         self.lastdraw=self.drawpad.create_line(self.x,self.y,event.x,event.y,fill=self.fgcolor)     def lineArrow(self,event):         self.startDraw(event)         self.lastdraw=self.drawpad.create_line(self.x,self.y,event.x,event.y,arrow=LAST,fill=self.fgcolor)     def rect(self,event):         self.startDraw(event)         self.lastdraw=self.drawpad.create_rectangle(self.x,self.y,event.x,event.y,outline=self.fgcolor)     def pen(self,event):         self.startDraw(event)         self.lastdraw=self.drawpad.create_line(self.x,self.y,event.x,event.y,fill=self.fgcolor)         self.x=event.x         self.y=event.y     def eraser(self,event):         self.startDraw(event)         self.drawpad.create_rectangle(self.x-4,self.y-4,event.x+4,event.y+4,fill=self.bg)         self.x=event.x         self.y=event.y     def kuaijiejian(self,event):         #设置按钮快捷键 #运行区 if __name__=='__main__':     root=Tk()     root.geometry(str(win_width)+"x"+str(win_height+100)+"+100+100")     root.title("画图软件")     app=AppLication(master=root)     root.mainloop()

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