dotted line larger linewidths

Again, apologies if this is an obvious question but I couldn't find the answer.

With a lw=1 dotted (:slight_smile: line the dots are square and it looks very
nice. But when I put lw up say to 2 or 3, the dots become rectangular,
which looks a bit odd, particularly at points where the underlying
graph curves sharply compared to the spacing of the dots.

Is there anyway to keep the dots square (ie as lw=2 for both
dimensions) instead of rectangular?

Cheers

Robin

This is arguably a "bug" that the dash descriptors aren't being scaled along with the line width. However, I'm loathe to "fix" it as it's been this way a long time, and all backends are at least consistent with one another in this behavior. Note, however, that inkscape, and I suspect other vector graphics tools, don't behave like matplotlib -- the dashes are scaled with the line width -- even though the underlying format, in this case SVG, doesn't behave that way.

As a workaround, you can explicitly set the dash sequence, e.g.:

plot([1,2,3], lw=6, dashes=(6, 6))

See here:

http://matplotlib.sourceforge.net/api/artist_api.html#matplotlib.lines.Line2D.set_dashes

Cheers,
Mike

Robin wrote:

···

Again, apologies if this is an obvious question but I couldn't find the answer.

With a lw=1 dotted (:slight_smile: line the dots are square and it looks very
nice. But when I put lw up say to 2 or 3, the dots become rectangular,
which looks a bit odd, particularly at points where the underlying
graph curves sharply compared to the spacing of the dots.

Is there anyway to keep the dots square (ie as lw=2 for both
dimensions) instead of rectangular?

Cheers

Robin

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Michael Droettboom
Science Software Branch
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Space Telescope Science Institute
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