Constrain angles of path handles? [2022]

This is very easy to do with Astute Graphics' Inkscribe plugin. Hold down alt while dragging the bezier handle. 

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@default8wcd4dpnqeru wrote:

Hope that makes some sense. If not I will make a diagram / video. 

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Yes, it makes sense, as Adobe Illustrator has had this (seemingly) forever. Smart Guides display a screen tip "ON" so if you go astray a little, you just move your mouse until "ON" reappears. It works exactly as you describe. In addition, you can set up Custom Construction Guides and specify an angle even before you start to draw. 

Paths can be copied from Illustrator to Photoshop. 

I just did this earlier this week when I drew lines across all the straight edges in a building and then extended them (in Illustrator!) out to the vanishing point. To make sure I lined things up when I got back to Photoshop, I also drew a small square in the upper left of the image. 

Illustrator would let me convert those paths to guides, but Photoshop does not support angled guides either, so I pasted them as Paths in PS and stroked them on a new layer. 

Unfortunately, Photoshop does not have the ability to maintain the angle of an existing path. 

~ Jane 

Yes, this is a feature i've been requesting for decades. Unfortunately, i imagine very few people working at Adobe ever use paths for hours a day, so the needed improvements are non-existent. 

I see no option to achieve maintaining the angle while dragging bezier handles.

Using a Script would most likely need numerical input (or an UI element like a slider) in a dialog and not allow on-canvas-dragging. 

It’s one of the reasons why it is so useful to set curve points on the horizontal and vertical extremes, that way one can use the shift-key …