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Enables hatch alpha on SVG #16890

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Merged
merged 3 commits into from
Mar 24, 2020
Merged

Enables hatch alpha on SVG #16890

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003ea0b
Enables hatch alpha on SVG
mnmelo Mar 23, 2020
58f1527
Updated test baseline image
mnmelo Mar 23, 2020
c939331
Cleaned code and added a whats_new
mnmelo Mar 24, 2020
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6 changes: 6 additions & 0 deletions doc/users/next_whats_new/2020-03-24-svg-hatch-alpha.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,6 @@
The SVG backend can now render hatches with transparency
--------------------------------------------------------

The SVG backend now respects the hatch stroke alpha. Useful applications are,
among others, semi-transparent hatches as a subtle way to differentiate columns
in bar plots.
13 changes: 8 additions & 5 deletions lib/matplotlib/backends/backend_svg.py
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Original file line number Diff line number Diff line change
Expand Up @@ -391,16 +391,19 @@ def _write_hatches(self):
x="0", y="0", width=str(HATCH_SIZE+1),
height=str(HATCH_SIZE+1),
fill=fill)
writer.element(
'path',
d=path_data,
style=generate_css({
hatch_style = {
'fill': rgb2hex(stroke),
'stroke': rgb2hex(stroke),
'stroke-width': str(mpl.rcParams['hatch.linewidth']),
'stroke-linecap': 'butt',
'stroke-linejoin': 'miter'
})
}
if stroke[3] < 1:
hatch_style['stroke-opacity'] = str(stroke[3])
writer.element(
'path',
d=path_data,
style=generate_css(hatch_style)
)
writer.end('pattern')
writer.end('defs')
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