Hello, I would like to draw a curved arrow inside an axis using Makie.jl More precisely, I have a starting point x0, a final point x1, and I want to draw and arrow which is not straight, but curved in some way. How can I do it? The arrows function seems to support only straight arrows.

If you dont find a solution with Makie.jl alone, check BezierCurve in Meshes.jl. you can visualize them as described in the docs.

Makie does have a BezierPath function that you can give Bezier commands in the syntax of d - SVG: Scalable Vector Graphics | MDN to. I’m not sure how well supported it is but it is documented. The authors of Makie might be able to give better assistance on their discord that might integrate better w…

Makie.jl has the BezierPath, which should be similar to the BezierCurve you proposed (right?). Although I can use the lines function together with the BezierPath, I don’t know how to make the head of the arrow, corresponding to the correct direction.

That doesn’t exist yet as a nice recipe, but I have plans for it. A quick mockup without much functionality is this: @recipe(CurvedArrow) do scene Theme( color = :black, ) end function Makie.plot!(p::CurvedArrow) scene = Makie.get_scene(p) points = lift(p, scene.camera.pro…

It doesn’t work for me. I have CairoMakie v0.12.5

Hm I did this with GLMakie, would have to try later what’s going on. As a side note, telling me how something doesn’t work is helpful :smile:

It doesn’t display in the jupyter notebook. No errors, but I can’t see anything.

Aha seems some method in CairoMakie is missing to project the EllipticalArc. This works, using some internal makie function to replace the EllipticalArc with curves path = lift(arc) do arc Makie.replace_nonfreetype_commands( BezierPath([ MoveTo(points[][1]), …

Thank you very much. BTW, is it necessary all this code? In my mind, I was wondering on using just lines with a BezierPath and then making the head using a single marker of scatter. The only question is how to get the correct angle of the marker to be the head of the arrow.

The complexity comes exactly from that problem, determining marker angle in screen space, and connection line in screen space. If you make an arc in data space it will not look like an arc if your axes are scaled differently

Curved arrow using Makie.jl

Specific Domains Visualization

cmdenis September 5, 2024, 9:31pm 14

Ok, thanks! That’s neat for straight lines!

It would be a nice feature to be able to do it with curved lines in Makie:

using Plots
plot(sin, 0:0.01:7, arrow = true)

Which yields:

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Curved arrow using Makie.jl

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