Where is the cairo example?

[kindaro]

My task is to open a window, draw some diagrams with Chart and interact with a human. Chart-cairo provides a function runBackend that creates a cairo Render. I was looking for a way to render that Render.

There was a cairo example. It is referred to from https://github.com/haskell-gi/haskell-gi/wiki/Using-Cairo-with-haskell-gi-generated-bindings. However, it seems to have been removed in commit c844d5f. The missing example seems to have been doing what I need. The function of interest is renderWithContext ∷ GI.Cairo.Context → Render () → IO ().

There is also an issue timbod7/haskell-chart#241 that offers renderToGI ∷ C.Render a → GI.Render a. However, this issue does not offer a complete example either.

Can documentation for this use case be updated with a working and supported example?

[garetxe]

Thanks for the report, and sorry for the delay in replying.

I think that the example would still build, but the handwritten Haskell binding to cairo (the cairo package, not gi-cairo) does not build for me any more, so the example does not compile any more because of this.

The error I get is

src/Gtk2HsSetup.hs:(297,20)-(304,1): Missing field in record construction ppOrdering

I suspect this is probably not very hard to fix, but I haven't had time to look into it. I am happy to reinstate the cairo example once the cairo package is fixed.

[int-index]

Consider using https://github.com/cohomology/gi-cairo-render, it solves the issue for me. There's an example there, too.