CODEWITHSUNDEEP
pythontkinter
Jonathan
Jonathan

Reputation: 1936

Tkinter - Getting x,y coordinates of Label object

I have defined a Label object as: 

panel = Label(image_frame, image=self.img, cursor="cross")

Now, I'd like to do draw polygon on top of this, and I have created a function called draw() that binds to a canvas and will allow me to draw a polygon on top of it. So, I know my draw() command works.

However, I need to do this on top of the panel that I've defined as a Label. The biggest problem I'm having is this line in my draw() command

if event.widget.canvasx(event.x)-2 < orig_x < event.widget.canvasx(event.x)+2 and event.widget.canvasy(event.y)-2 < orig_y < event.widget.canvasy(event.y)+2 :

I'm producing the following error:

AttributeError: 'Label' object has no attribute 'canvasx'

Is there an analog for canvasx for Label object? How can I bypass this without changing Label? Or is changing Label to canvas my only option?

The only other thing I can think of is to have a transparent canvas behind the Label, but then on-resize, things get messy.

Upvotes: 0

Views: 711

Answers (1)

Bryan Oakley
Bryan Oakley

Reputation: 385870

Is there an analog for canvasx for Label object? How can I bypass this without changing Label? Or is changing Label to canvas my only option?

No, because there is no need. canvasx exists because the canvas can be scrolled in any direction, and you need to be able to convert from widget coordinates to the inner canvas coordinates.

In the case of a label, if you click at the 0,0 coordinate of a label, that will always be the upper left corner of the label, because the interior of the label cannot be scrolled.

Note: it is not possible to embed a label widget (or any other widget) on a canvas, and then draw on top of the label. The official canvas documentation says this about that:

Note: due to restrictions in the ways that windows are managed, it is not possible to draw other graphical items (such as lines and images) on top of window items. A window item always obscures any graphics that overlap it, regardless of their order in the display list.

Upvotes: 1

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