change zero point left bottom and error

Question

In Illustrator, I moved the reference point of the artboard to the bottom left and drew a 20mm square. Then, I tried to move the object's position by -2mm on both the X and Y axes based on the reference point. However, while the X-axis moved -2mm outside the artboard, the Y-axis did not move -2mm outside the artboard but rather moved inside. This means instead of moving downwards, it moved upwards. I believe there might be an error in Photoshop. For reference, when the original reference point at the top left is set to 0, 0 and the object is moved by -2mm, it moves to the left and up, going -2mm outside the artboard.

Can you solve this problem?

Ton Frederiks · Answer

You moved the zero point, but did not change the coordinate system.

In CS4 and earlier, coordinate system Lower Left: Positive Y moving up

In CS5 and later, coordinate system Upper Left: Positive Y moving down

Here you can find a script that changes the coordinate system. You need to double click the Ruler intersection to update the zero point after using the script.

https://community.adobe.com/t5/illustrator-discussions/js-change-cs5-ruler-origin-to-bottom-left-like-cs4/m-p/3633729

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