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!
> >
> > ---> 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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