[Matplotlib-users] Wind barbs with small arrow heads

2014-09-17 Thread Jesper Larsen
Hi matplotlib users I am developing an application for showing weather forecasts using matplotlib. We use wind barbs for displaying wind forecasts: http://api.fcoo.dk/ifm-maps/greenland/?zoom=6lat=62lon=-45layer=FCOO%20Standardoverlays=TTFFF This is fine for our power users. We do

Re: [Matplotlib-users] [Anaconda Support] Re: Anaconda Mac or matplolib bug ?

2014-09-17 Thread Darren Dale
If you don't get an error message, and you don't get a window, it probably means you matplotlib is defaulting to the Agg backend. The backend is set by default in site-packages/matplotlib/mpl-data/matplotlibrc . What does this report?: import matplotlib print(matplotlib.rcParams['backend']) On

Re: [Matplotlib-users] Wind barbs with small arrow heads

2014-09-17 Thread Ryan May
Jesper, For performance reasons, what _make_barbs() does is create a (almost degenerate) polygon for each wind barb in the data set. The barbs are drawn such that y is along the barb, and x is perpendicular to the barb; the barb is then rotated as appropriate. The first point in the polygon is