我的代码应该在画布中创建多个图像。我应该能够用线条加入他们。图像是拖放启用的。我想我需要在画布中处理多个事件。每当我想在两个之间画一条线时，图像也会被拖动。我不知道如何将一个事件专门调用到我的画布 对于糟糕的代码，请帮忙并抱歉。
from Tkinter import *
import tkMessageBox
def callback():
if tkMessageBox.askokcancel("Quit", "Do you really wish to quit?"):
root.destroy()
class AppUI(Frame):
def __init__(self, master):
Frame.__init__(self, master, background="white", relief=FLAT, bd=2, height=768, width=1024)
self.menubar = Menu(self)
menu = Menu(self.menubar)
self.menubar.add_cascade(label="File", menu=menu)
menu.add_command(label="New")
menu.add_command(label="Open")
menu.add_command(label="Save As")
menu.add_command(label="Save Copy of")
menu.add_separator()
menu.add_command(label="exit")
menu = Menu(self.menubar)
self.menubar.add_cascade(label="Edit", menu=menu)
menu.add_command(label="Cut")
menu.add_command(label="Copy")
menu.add_command(label="Paste")
menu = Menu(self.menubar)
self.menubar.add_cascade(label="Debug", menu=menu)
menu.add_command(label="Open Debugger")
menu.add_command(label="Auto-debug")
menu.add_command(label="Revert")
menu = Menu(self.menubar)
self.menubar.add_cascade(label="Run", menu=menu)
menu.add_command(label="Stimulation")
menu.add_command(label="Check")
menu.add_command(label="Scan Module")
menu = Menu(self.menubar)
self.menubar.add_cascade(label="Help", menu=menu)
menu.add_command(label="Help files")
menu.add_command(label="FTA site")
menu.add_separator()
menu.add_command(label="Credits")
self.master.config(menu=self.menubar)
f0 = Frame(root, background="white")
b1 = Button(f0, bd=2, padx=15, pady=15, justify = LEFT)
photo1 = PhotoImage(file="Images/p1.gif")
b1.config(image = photo1,width="50",height="50", command=self.create_image1)
b1.image = photo1
b1.pack(side=LEFT)
b2 = Button(f0, bd=2, padx=15, pady=15, justify = LEFT)
photo2 = PhotoImage(file="Images/p4.gif")
b2.config(image=photo2, width="50",height="50", command = self.create_image2)
b2.image = photo2
b2.pack(side=LEFT)
b3 = Button(f0,padx=15, bd=2, pady=15, justify = LEFT)
photo3 = PhotoImage(file="Images/p8.gif")
b3.config(image=photo3, width="50",height="50", command = self.create_image3)
b3.image = photo3
b3.pack(side=LEFT)
b4 = Button(f0,padx=15, bd=2, pady=15, justify = LEFT)
photo4 = PhotoImage(file="Images/p7.gif")
b4.config(image=photo4, width="50",height="50", command = self.create_image4)
b4.image = photo4
b4.pack(side=LEFT)
b5 = Button(f0,padx=15, bd=2, pady=15, justify = LEFT)
photo5 = PhotoImage(file="Images/p5.gif")
b5.config(image=photo5, width="50",height="50", command = self.printtheline)
b5.image = photo5
b5.pack(side=LEFT)
f0.pack(anchor=NW, side=TOP)
self.imglist = []
self.canvas = Canvas(self, height=750, width=1500, bg="white")
self.canvas.pack(side=LEFT)
def create_image1(self):
photos1 = PhotoImage(file="Images/p1.gif")
self.photos1=photos1
self.imglist.append(photos1)
self.img1=self.canvas.create_image(60, 60, image=photos1)
self.canvas.bind("<B1-Motion>", self.move_image1)
self.canvas.bind("<ButtonRelease-1>")
def create_image2(self):
photos2 = PhotoImage(file="Images/p4.gif")
self.photos2=photos2
self.imglist.append(photos2)
self.img2=self.canvas.create_image(60, 60, image=photos2)
self.canvas.bind("<B1-Motion>", self.move_image2)
def create_image3(self):
photos3 = PhotoImage(file="Images/p8.gif")
self.photos3=photos3
self.imglist.append(photos3)
self.img3=self.canvas.create_image(60, 60, image=photos3)
self.canvas.bind("<B1-Motion>", self.move_image3)
def create_image4(self):
photos4 = PhotoImage(file="Images/p7.gif")
self.photos4=photos4
self.imglist.append(photos4)
self.img4=self.canvas.create_image(60, 60, image=photos4)
self.canvas.bind("<B1-Motion>", self.move_image4)
def move_image1(self, event):
self.canvas.delete(self.img1)
x = event.x
y = event.y
self.img1 = self.canvas.create_image(x, y, image=self.photos1, anchor='nw')
self.canvas.update()
def move_image2(self, event):
self.canvas.delete(self.img2)
x = event.x
y = event.y
self.img2 = self.canvas.create_image(x, y, image=self.photos2, anchor='nw')
self.canvas.update()
def move_image3(self, event):
self.canvas.delete(self.img3)
x = event.x
y = event.y
self.img3 = self.canvas.create_image(x, y, image=self.photos3, anchor='nw')
self.canvas.update()
def move_image4(self, event):
self.canvas.delete(self.img4)
x = event.x
y = event.y
self.img4 = self.canvas.create_image(x, y, image=self.photos4, anchor='nw')
self.canvas.update()
def getevent(self, event):
self.x = event.x
self.y = event.y
def createline(self, event):
x0,y0 = (self.x, self.y)
x1,y1 = (event.x, event.y)
self.canvas.create_line(x0,y0,x1,y1, fill="black")
def printtheline(self):
self.canvas.bind("<Button-1>", self.getevent)
self.canvas.bind("<ButtonRelease-1>", self.createline)
root = Tk()
root.protocol("WM_DELETE_WINDOW", callback)
app = AppUI(root)
app.pack()
root.mainloop()
答案 0 :(得分：0)
每当你致电self.canvas.bind("<B1-Motion>", ...)时，你正在销毁任何旧的绑定并创建一个新绑定。因此，您最后一次调用它是每次触发的那个。您也绝对不希望在绑定调用的函数内调用update。
您需要做的是在鼠标按钮上创建三个不同的绑定。按下按钮，您需要确定光标下面的对象并保存对它的引用，以及起始x，y。在按钮动作上，您使用该保存的参考并使用当前的x，y调用canvas_move来计算上一次移动时的增量。最后，在鼠标按下时，您可以完成任何需要完成的任务。
有关完整工作示例，请参阅问题this answer的board-drawing code to move an oval。