diff --git a/doc/users/next_whats_new/2020-03-24-svg-hatch-alpha.rst b/doc/users/next_whats_new/2020-03-24-svg-hatch-alpha.rst new file mode 100644 index 000000000000..06e53cf5db1c --- /dev/null +++ b/doc/users/next_whats_new/2020-03-24-svg-hatch-alpha.rst @@ -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. diff --git a/lib/matplotlib/backends/backend_svg.py b/lib/matplotlib/backends/backend_svg.py index add4fc90fafb..feac9f31817c 100644 --- a/lib/matplotlib/backends/backend_svg.py +++ b/lib/matplotlib/backends/backend_svg.py @@ -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') diff --git a/lib/matplotlib/tests/baseline_images/test_artist/clip_path_clipping.svg b/lib/matplotlib/tests/baseline_images/test_artist/clip_path_clipping.svg index 22c7a3044c35..e6743bd2a79b 100644 --- a/lib/matplotlib/tests/baseline_images/test_artist/clip_path_clipping.svg +++ b/lib/matplotlib/tests/baseline_images/test_artist/clip_path_clipping.svg @@ -1,7 +1,7 @@ - +