1. """一个画图软件项目"""
    4. from tkinter import *
    5. from tkinter.colorchooser import *
    6. from tkinter.filedialog import *
    8. #窗口的宽度和高度
    9. win_width = 900
    10. win_hegint =450
    12. class Application(Frame):
    14.     def __init__(self,master=None,bgcolor = "#eeeeee"):
    15.         super().__init__(master=None)
    16.         self.master=master
    17.         self.bgcolor = bgcolor
    18.         self.x=0
    19.         self.y=0
    20.         self.fgcolor="#000000"
    21.         self.lastDraw=0 #表示绘制最后图形的id
    22.         self.startDrawFlag = False
    23.         self.pack()
    24.         self.createWiget()
    28.     def createWiget(self):
    29.         # 创建绘图区
    30.         self.drawpad = Canvas(root, width=win_width, height=win_hegint*0.9, bg=self.bgcolor)
    31.         self.drawpad.pack()
    33.         #创建按钮
    34.         ##开始按钮
    35.         btn_start = Button(root,text="开始", name="start")
    36.         btn_start.pack(side="left",padx="10")
    37.         ##画笔按钮
    38.         btn_pen = Button(root, text="画笔", name="pen")
    39.         btn_pen.pack(side="left", padx="10")
    40.         ##矩形按钮
    41.         btn_rect = Button(root, text="矩形", name="rect")
    42.         btn_rect.pack(side="left", padx="10")
    43.         ##清屏按钮
    44.         btn_clear = Button(root, text="清屏", name="clear")
    45.         btn_clear.pack(side="left", padx="10")
    46.         ##橡皮按钮
    47.         btn_eraser = Button(root, text="橡皮", name="eraser")
    48.         btn_eraser.pack(side="left", padx="10")
    49.         ##直线按钮
    50.         btn_line = Button(root, text="直线", name="line")
    51.         btn_line.pack(side="left", padx="10")
    52.         ##箭头直线按钮
    53.         btn_lineArrow = Button(root, text="箭头直线", name="lineArrow")
    54.         btn_lineArrow.pack(side="left", padx="10")
    55.         ##颜色按钮
    56.         btn_color = Button(root, text="颜色", name="color")
    57.         btn_color.pack(side="left", padx="10")
    59.         #事件处理
    60.         btn_pen.bind_class("Button","<1>",self.eventManage)
    61.         self.drawpad.bind("<ButtonRelease-1>",self.stopDraw)
    63.         #增加颜色切换的快捷键
    64.         root.bind("<KeyPress-r>", self.kuaijiejian)
    65.         root.bind("<KeyPress-g>", self.kuaijiejian)
    66.         root.bind("<KeyPress-y>", self.kuaijiejian)
    70.         #点击按钮添加事件
    71.     def eventManage(self,event):
    72.         name = event.widget.winfo_name()
    73.         print(name)
    74.         if name == "line":
    75.             self.drawpad.bind("<B1-Motion>",self.myline)
    76.         elif name == "lineArrow":
    77.             self.drawpad.bind("<B1-Motion>", self.mylineArrow)
    78.         elif name == "rect":
    79.             self.drawpad.bind("<B1-Motion>", self.myRect)
    80.         elif name == "pen":
    81.             self.drawpad.bind("<B1-Motion>", self.myPen)
    82.         elif name =="eraser":
    83.             self.drawpad.bind("<B1-Motion>", self.myEraser)
    84.         elif name == "clear":
    85.             self.drawpad.delete("all")
    86.         elif name == "color":
    87.             c = askcolor(color=self.fgcolor,title="选择画笔颜色")
    88.             self.fgcolor =c[1]
    94.          #方法封装两个线
    95.     def starDraw(self,event):
    96.         self.drawpad.delete(self.lastDraw)
    97.         if not self.startDrawFlag:
    98.             self.startDrawFlag = True
    99.             self.x = event.x
    100.             self.y = event.y
    102.         #如何停止画线
    103.     def stopDraw(self,event):
    104.         self.startDrawFlag = False
    105.         self.lastDraw = 0
    107.         #直线画法
    108.     def myline(self,event):
    109.         self.starDraw(event)#方法在startDraw里面，直接调用
    110.         self.lastDraw=self.drawpad.create_line(self.x,self.y,event.x,event.y,fill=self.fgcolor)
    113.         #箭头直线画法
    114.     def mylineArrow(self,event):
    115.         self.starDraw(event)#方法在startDraw里面，直接调用
    116.         self.lastDraw = self.drawpad.create_line(self.x, self.y, event.x, event.y, arrow=LAST, fill=self.fgcolor)
    118.         #矩形画法
    119.     def myRect(self,event):
    120.         self.starDraw(event)  # 方法在startDraw里面，直接调用
    121.         self.lastDraw = self.drawpad.create_rectangle(self.x, self.y, event.x, event.y,outline=self.fgcolor)
    123.         #画笔做法
    124.     def myPen(self,event):
    125.         self.starDraw(event)  # 方法在startDraw里面，直接调用
    126.         self.drawpad.create_line(self.x, self.y, event.x, event.y, fill=self.fgcolor)#不调用删除
    127.         self.x = event.x
    128.         self.y = event.y
    130.         #橡皮擦
    131.     def myEraser(self,event):
    132.         self.drawpad.create_rectangle(event.x-4, event.y-4,  event.x+4, event.y+4, fill=self.bgcolor)
    137.     #快捷键的调用
    138.     def kuaijiejian(self,event):
    139.         if event.char == "r":
    140.             self.fgcolor ="#ff0000"
    141.         elif event.char == "g":
    142.             self.fgcolor ="#00ff00"
    143.         elif event.char == "y":
    144.             self.fgcolor="#ffff00"
    151. if __name__ == "__main__":
    152.     root = Tk()
    153.     root.title("画画板")
    154.     root.geometry(str(win_width)+"x"+str(win_hegint)+"+500+100")
    155.     app=Application(master=root)
    156.     root.mainloop()

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