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legend and alpha are not working for histogram #124

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diegozea opened this issue Feb 2, 2016 · 7 comments
Closed

legend and alpha are not working for histogram #124

diegozea opened this issue Feb 2, 2016 · 7 comments

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@diegozea
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diegozea commented Feb 2, 2016

hist

@tbreloff
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tbreloff commented Feb 2, 2016

For histograms, the color is actually taken as the line color, so you would use linealpha. (I'm not sure that I want to change that, though I would listen to arguments for/against)

For some reason I don't add to the legend currently for histograms. I think I had a good reason for that, but I honestly can't remember right now. I'll consider changing that logic.

@tbreloff
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tbreloff commented Feb 2, 2016

I guess this is why:

PyError (:PyObject_Call) <type 'exceptions.ValueError'>
ValueError('The truth value of an array with more than one element is ambiguous. Use a.any() or a.all()',)
  File "/usr/lib64/python2.7/site-packages/matplotlib/axes/_axes.py", line 538, in legend
    self.legend_ = mlegend.Legend(self, handles, labels, **kwargs)
  File "/usr/lib64/python2.7/site-packages/matplotlib/legend.py", line 385, in __init__
    self._init_legend_box(handles, labels, markerfirst)
  File "/usr/lib64/python2.7/site-packages/matplotlib/legend.py", line 627, in _init_legend_box
    handler = self.get_legend_handler(legend_handler_map, orig_handle)
  File "/usr/lib64/python2.7/site-packages/matplotlib/legend.py", line 569, in get_legend_handler
    if orig_handle in legend_handler_keys:

I'll see if there's a way around this error. In the meantime I'm making the change for the Gadfly backend:

tmp

@diegozea
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I found this error again...

image

I believe that linealpha and fillaplha should have different meanings in hist, the first for the border/line of the bar, and the second for their filled colors.

@tbreloff
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I believe that linealpha and fillaplha should have different meanings in hist, the first for the border/line of the bar, and the second for their filled colors.

I agree with this. I had hesitations at first because the "series color" is usually linecolor, but that's not true for scatters, so there's precedence.

It also makes sense if you think of the histogram recipe I just made, where you're drawing the outline of a histogram using linetype = :path.

@tbreloff
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Also... this is making me think whether I should have a new argument seriescolor, which might effect the line, marker, or fill (or multiple of them) depending on the series type. Then aliases like color and alpha would map to seriescolor explicitly. It feels less hacky than "if type is histogram, then swap line color and fill color defaults" and similar hackiness.

@diegozea
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Having color default to seriescolor explicitly sounds fine to me.

@tbreloff
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Also... this is making me think whether I should have a new argument seriescolor, which might effect the line, marker, or fill (or multiple of them) depending on the series type. Then aliases like color and alpha would map to seriescolor explicitly.

I've made this change in the tb_pyplot branch... it's a much nicer flow now. And you can do things like set the alpha for the entire series all at once:

using Plots
plot(y, zcolor=y, m=(10,:inferno), α=0.3)

tmp

@tbreloff tbreloff closed this as completed May 4, 2016
t-bltg added a commit that referenced this issue Oct 6, 2022
* use Dates

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Jonas-a-Zimmermann pushed a commit to Jonas-a-Zimmermann/Plots.jl that referenced this issue Oct 29, 2024
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