Error get_image_data

[Python-Ninja-Hebi]

Using get_image_date I got an error.

RuntimeError: No image data, please be sure that sync_image_data is set to True

Example

from ipycanvas import Canvas

canvas = Canvas(width=200, height=200, sync_image_data=True)

canvas.fill_rect(25, 25, 100, 100)
canvas.clear_rect(45, 45, 60, 60)
canvas.stroke_rect(50, 50, 50, 50)

arr1 = canvas.get_image_data() 

best regards Hebi

[martinRenou]

Did you execute this entire code in a single code cell?

If so, this is expected, please refer to the documentation https://ipycanvas.readthedocs.io/en/latest/retrieve_images.html#get-image-data-as-a-numpy-array

Note that this won’t work if executed in the same Notebook cell. Because the Canvas won’t have drawn anything yet. If you want to put all your code in the same Notebook cell, you need to define a callback function that will be called when the Canvas has image data.

Closing as answered, but please reopen if you think there is another issue

[Python-Ninja-Hebi]

Thanks

I had a different description