"John Hunter" <[EMAIL PROTECTED]> writes:
> On 2/5/07, Berthold Höllmann <bhoel-lDxpuoTbsqf2eFz/[EMAIL PROTECTED]> wrote:
>
>> I get a file 'test.eps'. Using matplotlib 0.87.7 the PS bounding box
>> of the generated plot is far to wide. Is this a problem with my script
>> or a Problem of FigureCanvasAgg (and FigureCanvasPS)? What can I do to
>> get a tight bounding box?
>
> This is a problem with the way PS computes the bounding box -- it uses
> the bounding box of the Figure and ignores the fact that much of your
> figure is whitespace. It should compute the bounding box of the
> visible figure elements, so this should be considered a bug. To
> workaround, you can set the figure size to be more like the size of
> the content
>
> fig = Figure((3,7)) # set the width and height in inches
> canvas = FigureCanvas(fig)
> ax = fig.add_subplot(111)
> ax.plot([.5,.7],[1.5, 2.5])
> ax.add_artist(Rectangle((.5, 1.5), .2, 1, fill=False))
> ax.set_aspect("equal")
> canvas.print_figure('test.eps')
So there is no way to calculate the size occupied by the visible
figure elements? In my target application I also have no easy way to
figure out the size of the resulting plot, I hoped matplotlib has a
way tp extract it from the plotted data.
something like
-----
ax.set_aspect("equal")
ax.autoscale_view()
w, h = fig.get_size_inches()
xmin, xmax = ax.get_xlim()
ymin, ymax = ax.get_ylim()
xext = xmax - xmin
yext = ymax - ymin
if xext < yext:
w = h * xext/yext
else:
h = w * yext/xext
-----
gives a tighter bounding box, still having somehow too much room in
the unchanged direction.
>> Further, when I leave out the "ax.plot" line, the generated figure is
>> missing the "Rectangle" and is showing only a pair of axes counting
>> from 0 to 1. Is that a bug of matplotlib or something I have to fix in
>> my script?
>
> Use add_patch instead of add_artist. add_artist is the most generic
> method and Axes doesn't know how to query it's argument for it's data
> limits, which it then feeds to the autoscaler. If you use add_line to
> add lines.Line2D and add_patch to add patches.Patch instances, then
> Axes will know how to introspect them and update the autoscaler. But
> you will need to explicitly call "autoscale_view" before saving.
> Something like
I had tried "add_patch" but missed the ax.autoscale_view() call.
Thanks
Berthold
--
[EMAIL PROTECTED] / <http://höllmanns.de/>
[EMAIL PROTECTED] / <http://starship.python.net/crew/bhoel/>
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