Change hatch intensity/color for PDF backend

I am using the PDF backend and specifying a hatch for a fill_between()
call. The resultant PDF looks okay, but the hatch lines are too
light.

Is there a way to darken them? Also, is it possible to change the
color of the hatch lines? I'm okay solutions that are low-level hacks.
I just need the PDF to have proper hatches.

I can change their color by specifying 'edgecolor' to PathPatch, but
their intensity is still too low. :frowning:

···

On Mon, Apr 25, 2011 at 1:15 PM, T J <tjhnson@...287...> wrote:

I am using the PDF backend and specifying a hatch for a fill_between()
call. The resultant PDF looks okay, but the hatch lines are too
light.

Is there a way to darken them? Also, is it possible to change the
color of the hatch lines? I'm okay solutions that are low-level hacks.
I just need the PDF to have proper hatches.

Currently it's hardcoded. You can see it in this line in backend_pdf.py:

https://github.com/matplotlib/matplotlib/blob/9ca2c4118f684b4e145bd109008f77731d2d7cd4/lib/matplotlib/backends/backend_pdf.py#L1061

You could change that line.

However, long term, I think we need to add a hatch_line_width kwarg to artists -- and perhaps further (though this would break backward compatibility) separate out the edge color from the hatch line color, so one could have (for example) a black rectangle filled with red hatching (not currently possible without layering objects).

Cheers,
Mike

···

On 04/25/2011 04:21 PM, T J wrote:

On Mon, Apr 25, 2011 at 1:15 PM, T J<tjhnson@...287...> wrote:

I am using the PDF backend and specifying a hatch for a fill_between()
call. The resultant PDF looks okay, but the hatch lines are too
light.

Is there a way to darken them? Also, is it possible to change the
color of the hatch lines? I'm okay solutions that are low-level hacks.
  I just need the PDF to have proper hatches.

I can change their color by specifying 'edgecolor' to PathPatch, but
their intensity is still too low. :frowning:

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