I'm plotting a bunch of lines on a map. They're being colored according to the value of an attribute associated with the objects they represent, using a colormap. However, I also need to create a colorbar to act as a legend, describing what the colors of the lines means, in terms of values associated with that attribute.
What's the easiest way to do that?
I know what the upper and lower bounds of the values that need to be represented in the colorbar are, but I don't see any way to just slap a generic colorbar on the figure and give it some tick marks corresponding to the values I know the colors represent.
I have a list of all the Line2D objects in the map, but I can't pass them to colorbar() as the 'mappable' parameter without getting:
AttributeError: 'Line2D' object has no attribute 'autoscale_None'
It seems like this is something that should be trivially easy, but I don't see how to do it in the documentation anywhere.
Thanks for any insight you might have...
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