Is it possible to control matplotlib marker orientation?

Question

I would like to know if I have a triangular marker, is it possible to control its orientation? I have a series of facets, with their corresponding vertices, and I would like to plot a basemap of them. I know it is straight forward script when using Mayavi and tvtk.PolyData. But since I'm dealing with maps and not 3D objects, things got a bit complicated.

ps: for maps I'm using basemap tool.

I thanks for any help.

Answer 1

You can create custom polygons using the keyword argument marker and passing it a tuple of 3 numbers (number of sides, style, rotation).

To create a triangle you would use (3, 0, rotation), an example is shown below.

import matplotlib.pyplot as plt  x = [1,2,3] for i in x:     plt.plot(i, i, marker=(3, 0, i*90), markersize=20, linestyle='None')  plt.xlim([0,4]) plt.ylim([0,4])  plt.show() 

Answer 2

I just wanted to add a method to rotate other non-regular polygon marker styles. Below I have rotated the "thin diamond" and "plus" and "vline" by modifying the transform attribute of the marker style class.

import matplotlib as mpl import matplotlib.pyplot as plt import numpy as np  for m in ['d', '+', '|']:      for i in range(5):         a1, a2  = np.random.random(2)         angle = np.random.choice([180, 45, 90, 35])          # make a markerstyle class instance and modify its transform prop         t = mpl.markers.MarkerStyle(marker=m)         t._transform = t.get_transform().rotate_deg(angle)         plt.scatter((a1), (a2), marker=t, s=100)