On Wednesday, July 27, 2016 at 10:00:47 PM UTC-4, Rick Johnson wrote:
> On Wednesday, July 27, 2016 at 7:15:20 PM UTC-5, MRAB wrote:
> > On 2016-07-28 00:13, huey.y.ji...@gmail.com wrote:
> > > On Wednesday, July 27, 2016 at 4:18:29 PM UTC-4, huey.y...@gmail.com
> > > wrote:
> > >> Hi Folks,
> > >>
> > >> It is common to put a BUTTON on a canvas by the means of coding.
> > >> However, in my application, I need to draw a circle on canvas, and then
> > >> make this circle to work as if it is a button. When the circle is
> > >> clicked, it triggers a new image to be displayed. Somebody can help?
> > >> Thanks!
> > > Yes, Rick's code works great. Well, could you go a little further? I
> > > wish to pop out an image, while clicking the circle button. I mean, when
> > > the circle button was clicked, an image is displayed. Thanks.
> > > ---> By the way, the GUI is TK.
> > >
> > Here's a simple example:
> >
> >
> > #! python3.5
> > # -*- coding: utf-8 -*-
> > import tkinter as tk
> >
> > def mouse_clicked(event):
> > dist_sq = (event.x - circle['x']) ** 2 + (event.y - circle['y']) ** 2
> >
> > if dist_sq <= circle['radius'] ** 2:
> > print('Clicked inside circle')
> >
> > root = tk.Tk()
> >
> > canvas = tk.Canvas(root, width=400, height=200)
> > canvas.pack()
> >
> > circle = dict(x=60, y=60, radius=20)
> >
> > left = circle['x'] - circle['radius']
> > top = circle['y'] - circle['radius']
> > right = circle['x'] + circle['radius']
> > bottom = circle['y'] + circle['radius']
> >
> > canvas.create_oval((left, top, right, bottom), outline='red', fill='red')
> > canvas.bind('<Button-1>', mouse_clicked)
> >
> > root.mainloop()
>
> I didn't try your code, but you can simply it by using some of the core
> functionality provided via "canvas.tag_bind(...)"
>
> ## START CODE ##
> import Tkinter as tk
>
> def cb_canvasButton(event):
> print 'You clicked me using button {0}'.format(event.num)
> canvas.move('button', 10, 10) # Little extra surprise!
>
> root = tk.Tk()
> canvas = tk.Canvas(root)
> canvas.create_oval(10,10,50,50, outline='red', fill='blue',
> tags=('button',)
> )
> canvas.tag_bind('button', '<Button>', cb_canvasButton)
> canvas.pack()
>
> root.mainloop()
> ## END CODE ##
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