CODEWITHSUNDEEP
pythonloopstkinter
Donatello
Donatello

Reputation: 33

Python - Tkinter - Finding the loop

Once again I am stucked.

In a canvas I display 9 images Every 8 rows I add a column. This is only for testing purposes. At the end the images should be hundreds. I am trying to identify each image with a unique number. In order to do this I have an event which gives me the coordinates of the canvas. And here comes the noobs part. To get this unique number my code is

 if x_on_grid==0 and y_on_grid==448:
        index_bin=0
    elif x_on_grid==0 and y_on_grid==384:
        index_bin=1
    elif x_on_grid==0 and y_on_grid==320:
        index_bin=2
    elif x_on_grid==0 and y_on_grid==256:
        index_bin=3
    elif x_on_grid==0 and y_on_grid==192:
        index_bin=4
    elif x_on_grid==0 and y_on_grid==128:
        index_bin=5
    elif x_on_grid==0 and y_on_grid==64:
        index_bin=6
    elif x_on_grid==0 and y_on_grid==0:
        index_bin=7
    elif x_on_grid==64 and y_on_grid==448: #new column
        index_bin=8
    elif x_on_grid==64 and y_on_grid==384:
        index_bin=9

Of course it works perfectly, but it's not scientific at all. I am trying to reduce all these lines with a loop but I can't get the number needed, only the last one.

Any ideas?

Best

Upvotes: 0

Views: 43

Answers (1)

scotty3785
scotty3785

Reputation: 7006

Consider the following code

import tkinter as tk

def onclick(event):
    print(vars(event))
    nearest = event.widget.find_closest(event.x,event.y)
    nearest_tag = event.widget.gettags(nearest)[0]
    print(nearest_tag)

def drawCircles(c):
    size = 20
    for i in range(100):
        row = i % 10
        col = i // 10
        x1 = (row * size) + 30
        y1 = (col * size) + 30
        c.create_oval((x1,y1,x1+size,y1+size),tags="image_%03d" % i)

root = tk.Tk()
c = tk.Canvas(root,width=400,height=400,bg="white")
c.grid()
c.bind("<Button-1>",onclick)

drawCircles(c)
root.mainloop()

I'm using circles(ovals) rather than images but the principle is still the same. I draw 100 circles and as I draw then I assign a tag to them in the format image_?. When I click on the canvas, the find_closest method is used to determine which of the circles is nearest to the click. It then looks up the tag (or tags) of that object and prints it out.

No need for long winded if-elif-else statements.

Upvotes: 1

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