我試著去理解畫布的縮放是如何工作的。

例如，下面的代碼。為什么綁定到鼠標滾輪的canvas.scale("all", ...)正在縮放所有矩形，而不是文本。

如何實現文本和矩形的縮放？import Tkinter as tk

import random

pressed = False

class Example(tk.Frame):

def __init__(self, root):

tk.Frame.__init__(self, root)

self.canvas = tk.Canvas(self, width=400, height=400, background="bisque")

self.xsb = tk.Scrollbar(self, orient="horizontal", command=self.canvas.xview)

self.ysb = tk.Scrollbar(self, orient="vertical", command=self.canvas.yview)

self.canvas.configure(yscrollcommand=self.ysb.set, xscrollcommand=self.xsb.set)

self.canvas.configure(scrollregion=(0,0,1000,1000))

self.xsb.grid(row=1, column=0, sticky="ew")

self.ysb.grid(row=0, column=1, sticky="ns")

self.canvas.grid(row=0, column=0, sticky="nsew")

self.grid_rowconfigure(0, weight=1)

self.grid_columnconfigure(0, weight=1)

#Plot some rectangles

for n in range(50):

x0 = random.randint(0, 900)

y0 = random.randint(50, 900)

x1 = x0 + random.randint(50, 100)

y1 = y0 + random.randint(50,100)

color = ("red", "orange", "yellow", "green", "blue")[random.randint(0,4)]

self.canvas.create_rectangle(x0,y0,x1,y1, outline="black", fill=color, activefill="black", tags=n)

self.canvas.create_text(50,10, anchor="nw", text="Click and drag to move the canvas\nScroll to zoom.")

# This is what enables using the mouse:

self.canvas.bind("", self.move_start)

self.canvas.bind("", self.move_move)

self.canvas.bind("", self.pressed2)

self.canvas.bind("", self.move_move2)

#linux scroll

self.canvas.bind("", self.zoomerP)

self.canvas.bind("", self.zoomerM)

#windows scroll

self.canvas.bind("",self.zoomer)

# Hack to make zoom work on Windows

root.bind_all("",self.zoomer)

#move

def move_start(self, event):

self.canvas.scan_mark(event.x, event.y)

def move_move(self, event):

self.canvas.scan_dragto(event.x, event.y, gain=1)

#move

def pressed2(self, event):

global pressed

pressed = not pressed

self.canvas.scan_mark(event.x, event.y)

def move_move2(self, event):

if pressed:

self.canvas.scan_dragto(event.x, event.y, gain=1)

#windows zoom

def zoomer(self,event):

if (event.delta > 0):

self.canvas.scale("all", event.x, event.y, 1.1, 1.1)

elif (event.delta < 0):

self.canvas.scale("all", event.x, event.y, 0.9, 0.9)

self.canvas.configure(scrollregion = self.canvas.bbox("all"))

#linux zoom

def zoomerP(self,event):

self.canvas.scale("all", event.x, event.y, 1.1, 1.1)

self.canvas.configure(scrollregion = self.canvas.bbox("all"))

def zoomerM(self,event):

self.canvas.scale("all", event.x, event.y, 0.9, 0.9)

self.canvas.configure(scrollregion = self.canvas.bbox("all"))

if __name__ == "__main__":

root = tk.Tk()

Example(root).pack(fill="both", expand=True)

root.mainloop()

總結

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