On Wed, Jul 2, 2008 at 7:13 PM, Nihat <[EMAIL PROTECTED]> wrote:
> Here are my questions:
> 1. I have extended the Line2D class as I am using _nolegend_ in the label.
> I still wanted to differentiate between lines using something called id. Is
> there a better way of doing it with built-in attributes?
Nothing built into matplotlib, but python has an "id" function and the
line objects are hashable, so you probably don't need anything else.
> 2. I can remove the line but somehow the text added to the axes does not
> respond to pick events. Anybody has any thoughts?
It turns out text picking was broken in svn. When I looked at the
implementation, I saw
try:
l,b,w,h = self.get_window_extent().get_bounds()
except:
# TODO: why does this error occur
#print str(self),"error looking at get_window_extent"
return False,{}
so apparently some developer saw this was broken, hid it with a
blanket except that was silent, and forgot to get back to the TODO.
bbox.get_bounds did not survive the transform refactor, and is now
called bbox.bounds. This could of been me, thinking I would fix it
and then forgot about it, but I certainly hope not. Note to
developers: never catch all exceptions with a blanket except that
doesn't at least warn. This is fixed in svn so text picking is
working again.
> 3. The neat thing would be to add the text into the CustomLine class so
> line's label is contained in the class. Not sure how I can do it because
> text needs an axis and axis is nor associated with Line2D until you add the
> line to axis...
> 4. How can I add a constant offset like (2 pixels right, 2 pixels up) at the
> right end of the line for its text label.
This is possible, but is a little harder than it should be because to
do it elegantly you need to override a lot of methods. If we had a
proper containment API, it would be a lot easier and this is probably
something worth doing. I wrote up an example (added it to
examples/api/line_with_text.py in svn).
In general, I think it would be nice to add support for all artists
(lines, patches, whatever) to display their label. We would need to
think a little bit about the API for placing the label (eg if every
artist provides their extent, one could place the label at "upper
right" with a certain offset.
Here is the example:
import numpy as np
import matplotlib.pyplot as plt
import matplotlib.lines as lines
import matplotlib.transforms as mtransforms
import matplotlib.text as mtext
class MyLine(lines.Line2D):
def __init__(self, *args, **kwargs):
# we'll update the position when the line data is set
self.text = mtext.Text(0, 0, '')
lines.Line2D.__init__(self, *args, **kwargs)
# we can't access the label attr until *after* the line is
# inited
self.text.set_text(self.get_label())
def set_figure(self, figure):
self.text.set_figure(figure)
lines.Line2D.set_figure(self, figure)
def set_axes(self, axes):
self.text.set_axes(axes)
lines.Line2D.set_axes(self, axes)
def set_transform(self, transform):
# 2 pixel offset
texttrans = transform + mtransforms.Affine2D().translate(2, 2)
self.text.set_transform(texttrans)
lines.Line2D.set_transform(self, transform)
def set_data(self, x, y):
if len(x):
self.text.set_position((x[-1], y[-1]))
lines.Line2D.set_data(self, x, y)
def draw(self, renderer):
# draw my label at the end of the line with 2 pixel offset
lines.Line2D.draw(self, renderer)
self.text.draw(renderer)
fig = plt.figure()
ax = fig.add_subplot(111)
x, y = np.random.rand(2, 20)
line = MyLine(x, y, mfc='red', ms=12, label='line label')
#line.text.set_text('line label')
line.text.set_color('red')
line.text.set_fontsize(16)
ax.add_line(line)
plt.show()
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