matplotlib-devel Mailing List for matplotlib

I've created a further patch concerning custom symbols. The patch is
attached, as well as an example and the script producing it.

First what it does:

- you can now create custom line-symbols, which is useful to create e.g.
S-shaped symbols, see example:

    pylab.scatter(x,y,s=120,marker=(verts,2))

- you can now create asterisk-like symbols

    pylab.scatter(x,y,s=80,marker=(5,2))

Additionally I've corrected the scaling of custom verts.


However, there is problem with the asterisk symbols I'm not sure how to
solve, and I ask for your advice!!! As you can see in the attached
example output, custom_symbol2a.png, the length of the arms of the
asterisk-symbol appear different even so have numerically all the same
length. An asterisk-symbol is drawn by connecting the origin (0,0) with
one end of an arm, e.g. (1,0) and again back to the origin (0,0), then
to the next end of an arm and so on.
- Is there a better way to do this?
- And is there a way to avoid output artefacts like those in the example
attached ?

The artefact seems to be present for a pixel-devices only (like .png)
but not for a vector-drawing-device like eps :-( So it seems that it is
an issue of rounding to int ???

Manuel

Hi,

I'm not quite sure, but I think there is a bug in backend_agg.py in the
function draw_point(). I got an error when trying to use this function,
and the attached patch fixed the problem. As you can see, it seems that
there is just a parameter (rotation) missing.

Manuel