一 代码
import tkinter
from PIL import Image
app = tkinter.Tk()
app.title('My Paint----by cakin24')
app['width'] = 800
app['height'] = 600
#控制是否允许画图的变量，1：允许，0：不允许
yesno = tkinter.IntVar(value=0)
#控制画图类型的变量，1：曲线，2：直线，3：矩形，4：文本，5：橡皮
what = tkinter.IntVar(value=1)
#记录鼠标位置的变量
X = tkinter.IntVar(value=0)
Y = tkinter.IntVar(value=0)
#前景色
foreColor = '#000000'
backColor = '#FFFFFF'
#创建画布
image = tkinter.PhotoImage()
canvas = tkinter.Canvas(app, bg='white', width=800, height=600)
canvas.create_image(800, 600, image=image)
#鼠标左键单击，允许画图
def onLeftButtonDown(event):
yesno.set(1)
X.set(event.x)
Y.set(event.y)
if what.get()==4:
canvas.create_text(event.x, event.y, text=text)
canvas.bind('', onLeftButtonDown)
#记录最后绘制图形的id
lastDraw = 0
#按住鼠标左键移动，画图
def onLeftButtonMove(event):
global lastDraw
if yesno.get()==0:
return
if what.get()==1:
#使用当前选择的前景色绘制曲线
canvas.create_line(X.get(), Y.get(), event.x, event.y, fill=foreColor)
X.set(event.x)
Y.set(event.y)
elif what.get()==2:
#绘制直线，先删除刚刚画过的直线，再画一条新的直线
#global lastDraw
try:
canvas.delete(lastDraw)
except Exception as e:
pass
lastDraw = canvas.create_line(X.get(), Y.get(), event.x, event.y,
fill=foreColor)
elif what.get()==3:
#绘制矩形，先删除刚刚画过的矩形，再画一个新的矩形
#global lastDraw
try:
canvas.delete(lastDraw)
except Exception as e:
pass
lastDraw = canvas.create_rectangle(X.get(), Y.get(), event.x, event.y,
fill=backColor, outline=foreColor)
elif what.get()==5:
#橡皮，使用背景色填充10*10的矩形区域
canvas.create_rectangle(event.x-5, event.y-5, event.x+5, event.y+5,
outline=backColor, fill=backColor)
canvas.bind('', onLeftButtonMove)
#鼠标左键抬起，不允许画图
def onLeftButtonUp(event):
if what.get()==2:
#绘制直线
canvas.create_line(X.get(), Y.get(), event.x, event.y, fill=foreColor)
elif what.get()==3:
#绘制矩形
canvas.create_rectangle(X.get(), Y.get(), event.x, event.y,
fill=backColor, outline=foreColor)
yesno.set(0)
global lastDraw
lastDraw = 0
canvas.bind('', onLeftButtonUp)
#创建菜单
menu = tkinter.Menu(app, tearoff=0)
#打开图像文件
def Open():
filename = tkinter.filedialog.askopenfilename(title='Open Image',
filetypes=[('image', '*.jpg *.png *.gif')])
if filename:
global image
image = tkinter.PhotoImage(file=filename)
canvas.create_image(80, 80, image=image)
menu.add_command(label='Open', command=Open)
#添加菜单，清除
def Clear():
for item in canvas.find_all():
canvas.delete(item)
menu.add_command(label='Clear', command=Clear)
#添加分割线
menu.add_separator()
#创建子菜单，用来选择绘图类型
menuType = tkinter.Menu(menu, tearoff=0)
def drawCurve():
what.set(1)
print(what.get())
menuType.add_command(label='Curve', command=drawCurve)
def drawLine():
what.set(2)
menuType.add_command(label='Line', command=drawLine)
def drawRectangle():
what.set(3)
menuType.add_command(label='Rectangle', command=drawRectangle)
def drawText():
global text
text = tkinter.simpledialog.askstring(title='Input what you want to draw',
prompt='')
what.set(4)
menuType.add_command(label='Text', command=drawText)
menuType.add_separator()
#选择前景色
def chooseForeColor():
global foreColor
foreColor = tkinter.colorchooser.askcolor()[1]
menuType.add_command(label='Choose Foreground Color', command=chooseForeColor)
#选择背景色
def chooseBackColor():
global backColor
backColor = tkinter.colorchooser.askcolor()[1]
menuType.add_command(label='Choose Background Color', command=chooseBackColor)
#橡皮
def onErase():
what.set(5)
menuType.add_command(label='Erase', command=onErase)
menu.add_cascade(label='Type', menu=menuType)
#鼠标右键抬起，弹出菜单
def onRightButtonUp(event):
menu.post(event.x_root, event.y_root)
canvas.bind('', onRightButtonUp)
canvas.pack(fill=tkinter.BOTH, expand=tkinter.YES)
app.mainloop()
二 运行结果
