Revision: 8699
http://matplotlib.svn.sourceforge.net/matplotlib/?rev=8699&view=rev
Author: mdboom
Date: 2010-09-14 15:21:21 +0000 (Tue, 14 Sep 2010)
Log Message:
-----------
Fix semi-transparent Gouraud triangle rendering in SVG backend.
Modified Paths:
--------------
branches/v1_0_maint/lib/matplotlib/backends/backend_svg.py
Modified: branches/v1_0_maint/lib/matplotlib/backends/backend_svg.py
===================================================================
--- branches/v1_0_maint/lib/matplotlib/backends/backend_svg.py 2010-09-11
19:13:32 UTC (rev 8698)
+++ branches/v1_0_maint/lib/matplotlib/backends/backend_svg.py 2010-09-14
15:21:21 UTC (rev 8699)
@@ -325,6 +325,11 @@
# opposite edge. Underlying these three gradients is a solid
# triangle whose color is the average of all three points.
+ avg_color = np.sum(colors[:, :], axis=0) / 3.0
+ # Just skip fully-transparent triangles
+ if avg_color[-1] == 0.0:
+ return
+
trans_and_flip = self._make_flip_transform(trans)
tpoints = trans_and_flip.transform(points)
write = self._svgwriter.write
@@ -334,7 +339,7 @@
x1, y1 = points[i]
x2, y2 = points[(i + 1) % 3]
x3, y3 = points[(i + 2) % 3]
- c = colors[i][:3]
+ c = colors[i][:]
if x2 == x3:
xb = x2
@@ -352,8 +357,8 @@
write('<linearGradient id="GR%x_%d" x1="%f" y1="%f" x2="%f"
y2="%f" gradientUnits="userSpaceOnUse">' %
(self._n_gradients, i, x1, y1, xb, yb))
- write('<stop offset="0" stop-color="%s" stop-opacity="1.0"/>' %
rgb2hex(c))
- write('<stop offset="1" stop-color="%s" stop-opacity="0.0"/>' %
rgb2hex(c))
+ write('<stop offset="0" style="stop-color:%s;stop-opacity:%f"/>' %
(rgb2hex(c), c[-1]))
+ write('<stop offset="1" style="stop-color:%s;stop-opacity:0"/>' %
rgb2hex(c))
write('</linearGradient>')
# Define the triangle itself as a "def" since we use it 4 times
@@ -361,11 +366,11 @@
(self._n_gradients, x1, y1, x2, y2, x3, y3))
write('</defs>\n')
- avg_color = np.sum(colors[:, :3], axis=0) / 3.0
- write('<use xlink:href="#GT%x" fill="%s"/>\n' %
- (self._n_gradients, rgb2hex(avg_color)))
+ avg_color = np.sum(colors[:, :], axis=0) / 3.0
+ write('<use xlink:href="#GT%x" fill="%s" fill-opacity="%f"/>\n' %
+ (self._n_gradients, rgb2hex(avg_color), avg_color[-1]))
for i in range(3):
- write('<use xlink:href="#GT%x" fill="url(#GR%x_%d)"
filter="url(#colorAdd)"/>\n' %
+ write('<use xlink:href="#GT%x" fill="url(#GR%x_%d)"
fill-opacity="1" filter="url(#colorAdd)"/>\n' %
(self._n_gradients, self._n_gradients, i))
self._n_gradients += 1
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