Re: [Matplotlib-users] how to clip text outside a polygon path?

[Jae-Joon L. <lee...@gm...>]

It seems that there are at least two issues related with the text clipping.

The first issue is that the Text.draw method does not properly set
clip path. I think I fixed this in r8541 and r8542.

The second issue is that the agg backend does not seem to support a
clip path yet for the text.

Also, your script need to be fixed.
The patch need to be added to the axes (or its transform need to be
set) before you call set_clip_path.

So, with the current svn, you can clip the text with an arbitrary path
when you're using the backends that support it (I only tested with pdf
backend, the attached is the pdf output converted to png).
If you can install matplotlib from the svn, please test the patch.
Also, it would be great if you file a bug in the SF tracker, so that
other developer can fix it later.

Regards,

-JJ




On Tue, Jul 13, 2010 at 4:21 AM, shuwj <shu...@16...> wrote:
> Hi,
>
> I wanna know how to clip text outside a polygon path.
> In the attached a.png file, the polygon with red facecolor and green
> edgecolor is a Path. I want to get rid of the text 'aaaaaaaaunicode:
> Institut' outside the polygon and keep the part inside the polygon
> ('aaaaaaa') left.
>
> my code as follows. It can work out a 'right' result as i wanted.
> ------------------
> # -*- coding: utf-8 -*-
> import matplotlib.pyplot as plt
> import matplotlib.path as mpath
> import matplotlib.patches as mpatches
>
> import matplotlib.pyplot as plt
> from matplotlib.transforms import *
>
>
> Path=mpath.Path
>
> lines = [ [1,1.5],[1,6],[6,3],[3,1.5],[1,1.5] ]
>
> codes=[Path.LINETO]*len(lines)
> codes[0]=Path.MOVETO
> codes[-1]=Path.CLOSEPOLY
> path=mpath.Path(lines,codes)
> patch=mpatches.PathPatch(path,facecolor='red',edgecolor='green',lw=2)#,alpha=1)
>
>
> fig = plt.figure()
> fig.suptitle('bold figure suptitle', fontsize=14, fontweight='bold')
> ax = fig.add_subplot(111)
> fig.subplots_adjust(top=0.85)
> ax.set_title('axes title')
> ax.set_xlabel('xlabel')
> ax.set_ylabel('ylabel')
> ax.text(3, 8, 'boxed italics text in data coords', style='italic',
> bbox={'facecolor':'red', 'alpha':0.5, 'pad':10})
> ax.text(2, 6, r'an equation: $E=mc^2$', fontsize=15)
>
> t=ax.text(3, 2, unicode('aaaaaaaaunicode: Institut f\374r Festk\366rperphysik', 'latin-1'))
> t.set_clip_path(patch)
>
> ax.text(0.95, 0.01, 'colored text in axes coords',
> verticalalignment='bottom', horizontalalignment='right',
> transform=ax.transAxes,
> color='green', fontsize=15)
> ax.plot([2], [1], 'o')
> ax.annotate('annotate', xy=(2, 1), xytext=(3, 4),
> arrowprops=dict(facecolor='black', shrink=0.05))
> ax.axis([0, 10, 0, 10])
>
> ax.add_patch(patch)
> ax.set_clip_path(patch)
>
>
> plt.show()
>
> -------------------
>
>
> Can anybody give me a example?
> thanks.
>
>                   david.shu
>                   2010.7.13
>
>
>
>
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