John, David,
The problem is indeed the patch boundaries; here is the workaround:
In [2]:bb = bar(arange(500), rand(500))
In [3]:for b in bb: b.set_linewidth(0)
...:
In [4]:draw()
We should probably do something like setting linewidth to zero
automatically if edgecolor is None, so that the existing edgecolor kwarg
can be used to achieve this result. And/or add a linewidth kwarg.
Eric
John Hunter wrote:
>>>>>> "David" == David Huard <[EMAIL PROTECTED]> writes:
>
> David> Hi, When plotting a large amount of bars, like
>
> >>>> bar(arange(500), rand(500))
>
> David> the bars seem to overlap and it produces a weird effect.
>
> David> My feeling is that the culprit is the contour line around
> David> each rectangle, who probably don't scale properly in this
> David> limit. In fact, the problem is maybe not so much that the
> David> contour width doesn't scale, but that the contour is drawn
> David> outside the rectangle.
>
> David> I'd be glad to submit a patch, but I'd need some directions
> David> (where in the code is the contour drawn ?)
>
> This is likely due to either antialising of the bar patch.Rectangle
> objects (does it help to turn the antialiased property off?) or
> subpixel rendering (does it help to comment out these lines in
> src/_backend_agg.cpp in the draw_polygon function?)
>
> //snapto pixel centers
> x = (int)x + 0.5;
> y = (int)y + 0.5;
>
> JDH
>
>
>
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