I asked this question in a comment to a similar bug, but since that bug has been answered, I speculate that the comment is unlikely to be noticed.
The problem I'm dealing with relates to using RGBA colours (with alpha transparency) as the background colour of shapes. When I output that to SVG, I get SVG elements that look something like this:
<p fill="#FFFFFF00" ...>
Unfortunately, although Firefox will render this in a way that looks correct, Chrome and Inkscape will not (instead showing a black background), because SVG expects the transparency part of the colour to be specified in a fill-opacity attribute. The underlying implementation of that behaviour is specified in net.sourceforge.plantuml.svg.SvgGraphics -- the fillMe() method has some special handling for transparent black, but other transparency isn't covered. Can you tweak that method something like this:
private void fillMe(Element elt) {
if (fill.equals("#00000000") == false) {
double opacity = getOpacity(fill);
String fillWithoutOpacity = colourWithoutOpacity(fill);
elt.setAttribute("fill", fillWithoutOpacity);
if (opacity < 1.0) {
elt.setAttribute("fill-opacity", String.format("%,.5f", opacity));
}
}
}
private String colourWithoutOpacity(String colour) {
if (colour.matches("#[0-9A-Fa-f]{8}")) {
return colour.substring(0, 7);
} else {
return colour;
}
}
private double getOpacity(String colour) {
if (colour.matches("#[0-9A-Fa-f]{8}")) {
return Integer.parseInt(colour.substring(7), 16) / 255.0;
} else {
return 1.0;
}
}
