I have been using matplotlib with TkInter (TkAgg backend)

> and it's really nice once I got the hang of it... I have

> two questions though, which I couldn't find in the manual.

> 1. The figure window has a pretty large border around it,

> that seems to expand as I enlarge the window. Is there a

> way to set this to, say, N pixels?

You cannot set it by pixel, but you can control it with the axes

command. The syntax is axes([left, bottom, width, height]) where all

values are fractions of the figure. Eg, left and width are fractions

of the figure width, and bottom, top are fractions of the figure

height. With a little arithmetic, you can figure out what fractions

to use for a given pixel value, since the figure width in pixels is

width in inches * dpi. See

http://matplotlib.sf.net/matplotlib.matlab.html#-axes.

> 2. I have some x, y window coordinates I got via Tk event

> bindings. How can I translate these into data coordinates?

You can plot in any coordinate system you want by setting the

appropriate transform. If you want to plot in pixels, just specify

your data in pixels and use the identity_transform, as in this example

from matplotlib.matlab import *

from matplotlib.transforms import identity_transform

# left, bottom, width, height as fractions of figure size

axes([0.05, 0.05, .9, 0.9])

# plot in pixel coords with the identity transform

plot([100,400], [200,300], transform=identity_transform())

axis('off') # turn off tick labeling

show()

See http://matplotlib.sf.net/matplotlib.transforms.html for more

information on transforms.

For some backends, you may want to subtract the y pixel coordinate

from the figure height. You can get the pixel width and height of the

current figure with

w, h = gcf().get_width_height()

See http://matplotlib.sf.net/matplotlib.figure.html for help with

figure methods.

Good luck - when I get the users guide finished, some of these details

will be more accessible.

JDH

## ···

Thanks,

> Wayne

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