Is there a way to offset/move the arrowhead mark along the line?

[Andrew15-5]

I want to add the ability to use arrows in my WIP flowchart library. But apparently the tip of the arrow is longer than the line length itself. And the arrow only looks good with thickness of 0.1pt! Any more than that looks ugly.

0.1pt

1pt

2pt

I have a very messy workaround of checking if the line.mark.end is not none and add an offset to the block to which the arrow is pointing. In other words, to fix ugly arrows, I need to make my code ugly (the balance of things in nature).

The mark only have start/end/size options, but no offset/pos option (symbol doesn't work). In tikz there are a lot of things you can tweak with arrowheads. Can I somehow move "back" the arrow just a little bit, so that I don't need to recalculate/modify the coordinates where the drawing (of a flowchart symbol) should start?

[johannes-wolf]

You have two options: Fill the arrow but set it's stroke to none, or set the stroke cap style to something different (https://typst.app/docs/reference/visualize/line/#parameters-stroke).

Offsetting the arrow is currently not possible.

[Andrew15-5]

If I set arrow's stroke to none, then the line beneath the arrow will be seen near the tip:

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cap style doesn't change anything, but join does. If I set join to "round", then given the same thickness, it now doesn't show up from the other side:

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If I instead use default join: "miter" and change the value of miter-limit to 2 (from default 4.0) then it will cut out the tip of the arrow:

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With miter-limit: 1 the effect will be equal to join: "bevel" (all 3 corners are cut/clipped):

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I've checked: the cap only changes style of the non-fill arrow (join & miter-limit will work).

Note: this isn't a 100% perfect solution, because the arrow tip itself is never seen with thickness more than ~0.1pt.

[johannes-wolf]

Oh yes. I always mix up miter vs cap… great overview!
I tested this with TikZ and it gets it correct, so I will create a ticket: #162.