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Wow, that's fantastic Ben. Thanks so much for finding that, it's just 
what I need!
Regards,
- Phil
Benjamin Root wrote:
> Looks like someone else figured out a creative solution using quiver: 
> http://stackoverflow.com/questions/19918502/sawtooth-line-style-in-matplotlib
>
> Here it is (slightly cleaned up):
>
> |import matplotlib.pyplotas plt
> import numpyas np
>
> x= np.linspace(0, 2*np.pi, 100)
> y= np.sin(x)
>
> dx= np.diff(x)
> dy= np.diff(y)
>
> x2= np.linspace(0, 2*np.pi, 10)
> y2= np.sin(x2)
>
> dx= np.zeros_like(x2) + 1e-12
> dy= np.sin(x2+dx) - y2
>
> length= np.hypot(dx,dy)
> dx/= length
> dy/= length
>
> fig, ax= plt.subplots()
> ax.set_aspect("equal")
> ax.plot(x, y, lw=4)
>
> size= 20
> ax.quiver(x2, y2, -dy, dx, headaxislength=size, headlength=size, headwidth=size, color="blue")
> plt.margins(0.2)|
>
> I don't know yet how to get rounded heads, though. Now I am looking to 
> see how the text box styles of "sawtooth" and "roundtooth" are handled 
> in the code to see if that could be exploited, instead.
>
> Cheers!
> Ben Root
>
>
>
> On Fri, Oct 16, 2015 at 10:24 AM, Benjamin Root <ben...@gm... 
> <mailto:ben...@gm...>> wrote:
>
> Hmmm, this is actually an interesting problem. I am also a
> meteorologist, so this is interesting to me.
>
> I haven't figured it out yet, but here are my thoughts:
>
> 1) There are the "^" triangle markers as well as "2" tri_up
> markers:
> http://nbviewer.ipython.org/github/WeatherGod/AnatomyOfMatplotlib/blob/master/AnatomyOfMatplotlib-Part3-HowToSpeakMPL.ipynb#Markers
> 2) The markevery property should be set to a float value to have
> the markers spaced out evenly along the line regardless of aspect
> ratios and zooming (note, this assumes that the line is defined
> with many vertices to give a smooth appearance).
>
> Problem:
> Using markers and markevery in a Line2D object has an inherent
> limitation: all of the markers will be drawn in the same
> orientation. So, we can't orient the markers along the normal of
> the line.
> Also, there is no pre-defined marker for half-circles, so this
> approach wouldn't work well for warm-fronts/dry-lines/etc.
>
> I'll have to see if a PolygonCollection + Line2D might be the
> right approach here...
>
> Ben Root
>
>
>
>
> On Fri, Oct 16, 2015 at 7:22 AM, Phil Cummins
> <phi...@an... <mailto:phi...@an...>> wrote:
>
> Hi,
>
> I would like to plot "toothed" curves using basemap. These are
> curves with triangles on one side, that are used to plot
> pressure fronts in meteorology or thrust faults in geology.
> You need to be able to say which side of the curve the
> triangles should appear on. Does anyone know whether such
> curves can be plotted using mtplotlib/basemap?
>
> Thanks,
>
> - Phil
>
> Australian National University
>
>
>
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-- 
Phil Cummins
Prof. Natural Hazards
Research School of Earth Sciences
Australian National University