Adding Compose circles/lines/polygons to Gadfly plots?

[Sheehan Olver]

I want to add, say, a triangle or circle to a Gadfly plot.  The following works

compose(render(plot(x=1:10,y=1:10)),circle(0.5,0.5,0.1))

But I want the circle to use the same coordinate system as the plot.  Any advice?

[Sheehan Olver]

I came across this which answers my question:

http://gadflyjl.org/guide_annotation.html

[Nils Gudat]

That's a nice feature to know about, but it seems to suffer from the problem that it doesn't scale with the rest of the graph if one uses the zoom functionality (i.e. the circles don't stay in position relative to the graph if you change the display of the graph). 

[Daniel Jones]

Fixed in master now. Thanks for pointing that out.

[Kaj Wiik]

Julia 0.3.5

Gadfly 0.3.10

julia> plot(sin, 0, 2pi, Guide.annotation(compose(context(), circle([pi/2, 3*pi/2], [1.0, -1.0], [2mm]), fill(nothing), stroke("orange"))))

ERROR: annotation not defined

??

Kaj

[Daniel Jones]

Kaj,

Guide.annotation was recently added. I haven't tagged a new version since its inclusion, so you need to either checkout master (with Pkg.checkout("Gadfly")) or wait until I tag 0.3.11.

[Kaj Wiik]

Daniel,

Thanks, works now perfectly, I had to restart julia after checkout to get it working. In fact this was my suspicion but did not know how to get the master. 

This is indeed a very friendly community, many thanks!

Kaj