On Sun, Jan 3, 2010 at 1:02 AM, Phillip M. Feldman <pfeld...@verizon.net> wrote:
> Ah. It sounds as though one must consider the scale of the map, and
> then choose these offsets so that the text falls near but not too near
> the marker. It would be great if one could specify the text offsets in
> units of the font size rather than in units of map distance.
You can do it, it just takes a bit of knowledge about how different
transformations are used under the hood:
import matplotlib.transforms as mtransforms
import matplotlib.pyplot as plt
# Basic plot of single point. Adjust limits to give space
x0,y0 = 4,5
plt.plot(x0, y0, 'o')
plt.ylim(-10, 20)
plt.xlim(0, 15)
# Grab axes object so we can get the tranformation used to
# transform data points into axes coords
ax = plt.gca()
# Create a transform that moves to the data point and then
# adds an offset of 10 up (I'm not sure if it's points or pixels)
# Transforms can be combined using just the simple '+'
trans = ax.transData + mtransforms.Affine2D().translate(0, 10)
plt.text(x0, y0, 'Testing', horizontalalignment='center',
verticalalignment='center', transform=trans, clip_on=True)
# Now do one 15 right
trans2 = ax.transData + mtransforms.Affine2D().translate(15, 0)
plt.text(x0, y0, 'Testing2', horizontalalignment='left',
verticalalignment='center', transform=trans2, clip_on=True)
plt.show()
I hope this helps. Let me know if anything is unclear.
Ryan
--
Ryan May
Graduate Research Assistant
School of Meteorology
University of Oklahoma
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