Is it possible to set (0,0) to be the top left corner instead of centre?

Other
1

As per title, I was wondering if it is at all possible to set in PsychoPy (that will also work for online exps) the (0,0) coordinates to be on the top left corner instead of centre (note, I am not talking about anchoring).

So if a participant clicks using a mouse on the red square on the top left ((image below) the data will show mouse.x = 0, mouse.y=0.
Many thanks in advance.

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2

Hello @Yiannis

Does selecting ‘Top-left’ from the ‘Image’ > ‘Layout’ > ‘Anchor’ menu do the job?

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Best wishes Jens

3

Hi @JensBoelte

Many thanks for your response.
If I am not mistaken (I will need to double-check) the settings in your screenshot will place the image to the bottom right. This is because the top left corner of the image will be anchored to the centre (0,0) of the screen. Hence why I mentioned in my post that I am not talking about anchoring.

I just want to avoid doing any post-data collection calculations (which will likely be error-prone) especially when my stimuli sizes will be in height.

Thanks again
Yiannis

4

Hello @Yiannis

You are correct. Set the Spatial units to norm and Position to (-1,1).

Best wishes Jens