[Biopython-dev] Modifications to CircularDrawer

[Leighton Pritchard]

Hi all,

On 5 Dec 2012, at Wednesday, December 5, 13:50, David Martin wrote:

Peter, Leighton and I have had a brief discussion on Twitter re drawing circular genome diagrams.

I'd like to modify the CircularDrawer feature drawing to allow the following:

label_position: start|middle|end as per LinearDrawer
label_placement: inside|outside|overlap where inside and outside are anchored just inside and just outside the feature but do not overlap it, and overlap is the current behaviour
label_orientation: upright|circular which determines the orientation of the label. upright is the current behaviour. Circular would be oriented to face clockwise for the forward strand and anticlockwise for the reverse

This will cause some issues with track widths (how can you specify a track width for a feature track?)

Any thoughts/suggestions?

I think that the proposed changes are all sensible, but circular labels are fiddly, so we'll need to think a wee bit about what to do exactly (probably another reason why I didn't do much on this originally ;) ).

label_position makes perfect sense, as suggested.

label_placement as a concept is fine, but I think we might need to be more precise about the intended behaviour of the arguments. I think that 'overlap' is possibly just a result of the choice of two anchoring parameters: 'inside'/'outside' and 'start'/'end' of the label string (see .png if the list accepts them).  We might be able to cover all possibilities with just these two choices - does this image cover the range of intended positioning David?  If so, then how about two arguments (I'm easy on the argument names): 'label_outer=True/False' and 'label_anchor=start/end/0/1'?

[cid:4EA13CE3-20E7-41D8-870F-CBBAA9DD06B0 at scri.sari.ac.uk]

label_orientation: What I think you're saying is that we want a distinction between text that orients to assume a static page (one you always view upright: e.g. a monitor), and text that doesn't.  I prefer 'reorient_labels=True/False', or some other geometrically neutral argument name, to 'upright' (whose expected meaning could change depending on page location and local context) as a parameter, but it's a good idea.

IIRC Track widths are relative, rather than absolute, and don't include label bounding boxes, so off-hand I don't think there ought to be any downstream issues.  Famous last words, there! ;)

Cheers,

L.

--
Dr Leighton Pritchard
Information and Computing Sciences Group; Weeds, Pests and Diseases Theme
DG31, James Hutton Institute (Dundee)
Errol Road, Invergowrie, Perth and Kinross, Scotland, DD2 5DA
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