How to make objects precisely rotate and match the angle of random diagonal lines, and make it snap

Question

I want to know if there's a precise method of rotating objects to match the angle of random diagonal lines. For example, on the picture below, I want an object (circled black) to rotate and precisely match the red sides of the angles. On the angle on the left (circled red), that angle is exactly 90° and its red side is a vertical straight line, so I can just easily adjust my object and make it snap to that red side.

But I have no easy method that I know of on how to be precise on the angles on the right (circled blue). Angle #1 is basically 45° so I can just make the object rotate while holding shift to match that angle and be precise with it, but I can't make the object snap to that red side unlike the one earlier (the one circled red). For Angle #2 and #3, I really have no clue on how to be precise with my rotation on the object.

tromboniator · Accepted Answer

I'm sure there are other ways, but this is what occurs to me at the moment. Peter

Jacob Bugge · Answer

Zernolf,

I would also do as Peter says.

Smart Guides can be your best friends, especially when they are allowed to.

Often, Snap to [Whatever] is overused, especially Snap to Grid as mentioned by Monika, which will wreck the use of Smart Guides.

And Smart Guides work fine without other snapping, just their own.

With the Anchor Point as shown by Peter, you can see in his screenshot that Smart Guides say anchor when you are within snapping distance; when you are within snapping distance of the line (and move along it) they say path. (until you get into snapping distance of Anchor Points or intersections or whatever).

You may also consider which Smart Guides options/settings suit you best (and omit unecessary/confusing ones).

If you need the other corner of your box to hit the other line exactly, as may be the case in your #3, you can do (almost) the same, only (kind of) reversed, as follows:

1) Select the red line and Object>Path>Offset Path with the offset equalling the box height,

2) ClickDrag the box by its lower right corner to snap to the intersection of the red offset path and the black line, Smart Guides say, guess what, intersect;

3) Set that corner as the centre of rotation and ClickDrag the opposite corner to snap to the red line, Smart Guides say path;

4) Delete the red offset path.

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