Rotation incremental error after save

Forum|Forum|5 years ago
February 8, 2020
2 replies
3187 views

I am seeing an incremental error that is only visible after saving and reopening the file, when doing Object>Transform>Rotate.

The attached images are for the following example. Some type "hi" is written on a path (circle), starting at zero degrees on the right hand side (black, not quite visible in the pictures). Then two cases are shown:

-The black object is copied, aligned with the original, and Object>Transform>Rotate with Copy in increments (10 degrees here) up to 180 degrees.

-The black object is copied, aligned with the original, and Object>Transform>Rotate once by 180 degrees.

After that, both match at 180 degrees on screen. I save, close the file, reopen it, and there is a mismatch as observed on the attached pictures. This is for CS4.

I have tried with 5-degree increments and see less of an error, but it is there too.

Because this is rotating and comparing the same point on the circle, I suspect it is not related to Illustrator approximating circles with 4-point Bezier curves.

Bug

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Kurt Gold

Community Expert

I cannot replicate it either (tested in AI CS5 and AI CC 2020).

It may be caused by some kind of (inadvertent) misuse of the Align to Pixelgrid option, but that is just a guess.

Ton Frederiks

Community Expert

CS4 did not have the Align to Pixel Grid option.

S

sPretzelAuthor

Inspiring

Comparing the last "hi" in blue at 180 degrees (in increments of 10) and the first "hi" in blue at 0 degree, I can see for the 180-degree "hi" a slight shift of the centre bracket horizontally, as well as a vertical shift of the guide line that is supposed to sit flush with the path (the tangent, so to speak, or what mimicks the 0 baseline). The centre bracket has moved to the left and the tangent has lifted up from the path. The path itself is where it should be (click on the anchor point to check). Zoom at 6400% to clearly see it.

I can reset the vertical shift by dragging the bracket across the path (manual flip) and back. But this is not precise and I end up shifting the text sideways in the process. Flipping via Type on a Path Options does not reset the vertical shift!

I have attached three pictures showing this. The first shows the shift for the blue "hi" at 180 degrees, the second is a zoom-in on that, and the third is the first "hi" at 0 degree which does not have this problem.