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Merge pull request#16890 from mnmelo/patch-1

Enables hatch alpha on SVG

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+83

-74

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doc/users/next_whats_new
- 2020-03-24-svg-hatch-alpha.rst
lib/matplotlib
- backends
  - backend_svg.py
- tests/baseline_images/test_artist
  - clip_path_clipping.svg

+83

-74

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Lines changed: 6 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,6 @@`
	`1`	`+The SVG backend can now render hatches with transparency`
	`2`	`+--------------------------------------------------------`
	`3`	`+`
	`4`	`+The SVG backend now respects the hatch stroke alpha. Useful applications are,`
	`5`	`+among others, semi-transparent hatches as a subtle way to differentiate columns`
	`6`	`+in bar plots.`

Lines changed: 8 additions & 5 deletions

Original file line number	Diff line number	Diff line change
`@@ -391,16 +391,19 @@ def _write_hatches(self):`
`391`	`391`	`x="0",y="0",width=str(HATCH_SIZE+1),`
`392`	`392`	`height=str(HATCH_SIZE+1),`
`393`	`393`	`fill=fill)`
`394`		`-writer.element(`
`395`		`-'path',`
`396`		`-d=path_data,`
`397`		`-style=generate_css({`
	`394`	`+hatch_style= {`
`398`	`395`	`'fill':rgb2hex(stroke),`
`399`	`396`	`'stroke':rgb2hex(stroke),`
`400`	`397`	`'stroke-width':str(mpl.rcParams['hatch.linewidth']),`
`401`	`398`	`'stroke-linecap':'butt',`
`402`	`399`	`'stroke-linejoin':'miter'`
`403`		`- })`
	`400`	`+ }`
	`401`	`+ifstroke[3]<1:`
	`402`	`+hatch_style['stroke-opacity']=str(stroke[3])`
	`403`	`+writer.element(`
	`404`	`+'path',`
	`405`	`+d=path_data,`
	`406`	`+style=generate_css(hatch_style)`
`404`	`407`	`)`
`405`	`408`	`writer.end('pattern')`
`406`	`409`	`writer.end('defs')`

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