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POAdding Zooming in and out with a Tkinter Canvas Widget?
 

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  1. POAdding Zooming in and out with a Tkinter Canvas Widget?
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    <p>How would I add zooming in and out to the following script, i'd like to bind it to the mousewheel. If you're testing this script on linux don't forget to change the MouseWheel event to Button-4 and Button-5.</p> <pre><code>from Tkinter import * import Image, ImageTk class GUI: def __init__(self,root): frame = Frame(root, bd=2, relief=SUNKEN) frame.grid_rowconfigure(0, weight=1) frame.grid_columnconfigure(0, weight=1) xscrollbar = Scrollbar(frame, orient=HORIZONTAL) xscrollbar.grid(row=1, column=0, sticky=E+W) yscrollbar = Scrollbar(frame) yscrollbar.grid(row=0, column=1, sticky=N+S) self.canvas = Canvas(frame, bd=0, xscrollcommand=xscrollbar.set, yscrollcommand=yscrollbar.set, xscrollincrement = 10, yscrollincrement = 10) self.canvas.grid(row=0, column=0, sticky=N+S+E+W) File = "PATH TO JPG PICTURE HERE" self.img = ImageTk.PhotoImage(Image.open(File)) self.canvas.create_image(0,0,image=self.img, anchor="nw") self.canvas.config(scrollregion=self.canvas.bbox(ALL)) xscrollbar.config(command=self.canvas.xview) yscrollbar.config(command=self.canvas.yview) frame.pack() self.canvas.bind("&lt;Button 3&gt;",self.grab) self.canvas.bind("&lt;B3-Motion&gt;",self.drag) root.bind("&lt;MouseWheel&gt;",self.zoom) def grab(self,event): self._y = event.y self._x = event.x def drag(self,event): if (self._y-event.y &lt; 0): self.canvas.yview("scroll",-1,"units") elif (self._y-event.y &gt; 0): self.canvas.yview("scroll",1,"units") if (self._x-event.x &lt; 0): self.canvas.xview("scroll",-1,"units") elif (self._x-event.x &gt; 0): self.canvas.xview("scroll",1,"units") self._x = event.x self._y = event.y def zoom(self,event): if event.delta&gt;0: print "ZOOM IN!" elif event.delta&lt;0: print "ZOOM OUT!" root = Tk() GUI(root) root.mainloop() </code></pre>
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    1. This table or related slice is empty.
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      1. POAdding Zooming in and out with a Tkinter Canvas Widget?
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    1. COAre you actually looking to scale the canvas or just the image?
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      1. POAdding Zooming in and out with a Tkinter Canvas Widget?
      1. USJohn Giotta
    2. COeverything on the canvas, the image and an assortment of lines and circles will be on the canvas eventually. And once placed it's incredibly important that everything keeps its x,y coordinates.
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      1. POAdding Zooming in and out with a Tkinter Canvas Widget?
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