matplotlib-users Mailing List for matplotlib

On Sat, Sep 14, 2013 at 2:45 PM, Alexandre Voitenok <
avo...@ac...> wrote:
> Hi
> I am trying to figure out how to change font color (as opposed to the fill
> color) in select cells in Table. Is there a way to do this?
> Below is an example:
>
> import matplotlib.pyplot as plt
> import numpy as np
> import pandas as pd
> from matplotlib.table import Table
> def main():
> data = pd.DataFrame(np.random.random((12,8)),
> columns=['A','B','C','D','E','F','G','H'])
> returnsTable(data)
> plt.show()
>
> def returnsTable(data, fmt='{:.2f}/{:.1f}'):
> fig=plt.figure(figsize=(8,5))
> ax=plt.subplot(111)
> ax.set_axis_off()
> tb = Table(ax, bbox=[0,0,1,1])
> tb.auto_set_font_size(False)
>
> colorDict={-3:"#D00000",-2:"#FF5050",-1:"#FFBFBF",0:"#FFFFFF",1:"#D0FFD0",2:"#40FF40",3:"#00C000"}
>
> nrows, ncols = data.shape
> width, height = 1.0 / ncols, 1.0 / nrows
>
> dArray=data.values.reshape(np.product(data.shape))
> # mean&sigma..
> mean=np.average(dArray)
> sigma=np.std(dArray)
>
> # Add cells
> for (i,j), val in np.ndenumerate(data):
> z=(val-mean)/sigma
> idx = 0 if int(z)==0 else (max((int(z),-3)) if z<0 else
> min((int(z),3)))
> color = colorDict[idx]
>
> ##############################################
> ## IS THERE A WAY TO ALSO CHANGE FONT COLOR?
> tb.add_cell(i+1, j+1, width, height, text=fmt.format(val,z),
> loc='center', facecolor=color)
>
>
> # Row labels in cells themselves
> # use -1 with edgecolor='none' for outside the grid
> for i, label in enumerate(data.index):
> tb.add_cell(i+1, 0, width*2, height, text=label, loc='right',
> facecolor='none')
>
>
> # Column Labels...
> for j, label in enumerate(data.columns):
> tb.add_cell(0, j+1, width, height/2, text=label, loc='center',
> facecolor='none')
> tb.set_fontsize(8)
> ax.add_table(tb)
> return fig
>
> main()
>
>
>
Hmm, it doesn't look like you can do it from the add_cell() function. It
creates a Cell object, which in turn creates a Text object, but provides no
means of passing much down to that Text object. The Table object has a
dictionary of Cell objects: self._cells[(row, col)] = cell, keyed by the
tuple of row and column numbers. You could do something like this:
tb._cells[(i+1, j+1)]._text.set_color('yellow')
Note, I did not test the above line, but I suspect that should work.
Cheers!
Ben Root

On Sun, Sep 15, 2013 at 11:59 PM, C M <cmp...@gm...> wrote:
> Just a follow-up on this problem...
>
> I've found now that the index is only off if the plot is zoomed, and in
> the following way. When I zoom, the first point that is visible in the
> plot window will have index = 0, the next point will have index = 1, and so
> forth. If I zoom another section of the points, the indices are "reset" in
> this same way.
>
> What's really bizarre is that this is only occurring on one plot. When I
> try to reproduce the problem on other plots (so far at least), I can't.
>
> Any suggestions for how to chase this down would be very welcome.
>
> Thanks.
>
>
That is a very useful observation. I am not very familiar with the artist
picking code, but if I have to guess, I would wonder if indices are being
determined from a path created *after* clip_to_rect() is used internally.
Given that you are having difficulties in reproducing this issue in other
plots, I would suggest trying to pare down your badly behaving code as much
as you can and post it here. Furthermore, it would also be useful to
determine if the issue still occurs in v1.3 or in the master branch.
Cheers!
Ben Root

Just a follow-up on this problem...
I've found now that the index is only off if the plot is zoomed, and in the
following way. When I zoom, the first point that is visible in the plot
window will have index = 0, the next point will have index = 1, and so
forth. If I zoom another section of the points, the indices are "reset" in
this same way.
What's really bizarre is that this is only occurring on one plot. When I
try to reproduce the problem on other plots (so far at least), I can't.
Any suggestions for how to chase this down would be very welcome.
Thanks.
On Sun, Sep 15, 2013 at 5:30 PM, C M <cmp...@gm...> wrote:
> I have Matplotlib 1.1.0, and am doing point picking (using the OO approach
> to Matplotlib, and embedded in wxPython). My relevant code is as follows:
>
> #connect the pick event to the pick event handler:
> self.cid = self.canvas.mpl_connect('pick_event', self.on_pick)
>
> #This is the relevant part of the pick event handler:
> def on_pick(self, event):
> if isinstance(event.artist, Line2D):
> ind = event.ind
> print 'ind is: ', str(ind)
>
> This had been working in some cases, but I've found a case in which it
> appears to be giving me a value for ind that doesn't make sense. For
> example, I have a plot with two lines on it (and two y axes), each with
> over 50 points. When I pick one of the points right near the end, I expect
> the ind here will be about 50. However, it prints ind is: 3. In other
> words, the wrong index value. This is a serious issue for me, because I
> then use that index to look up information about that point.
>
> What could be going on here?
>
> Thanks,
> Che
>