Hi Armin,
Armin Le Grand schrieb am 15.03.2023 um 10:54:
Hi Regina,
thought about it deeper, and it's even getting stranger quickly. Let me
express my thoughts about possible problems. I will use an example: A
ColorStop sequence of four colors, (a..d)o for offset, (a..d)c for the
color. So let's look at
1) ao = 0%, ac
2) bo = 50%, bc
3) co = 50%, cc
4, do = 100%, dc
The order these should be used is defined by the offsets.
The order is defined by the order of the <stop> elements in the SVG (and
ODF) markup. If offsets do not follow this order they have to be
adjusted on reading the markup. Rules for that are described in
13.2.4 SVG 1.1 (Second Edition) https://www.w3.org/TR/SVG11/
or
14.2.4 SVG 2 (Editors Draft)
https://svgwg.org/svg2-draft/pservers.html#StopNotes
So the order of stops with identical offset is given by the order of
them in markup and after reading the markup as order in your vector. The
import filter are responsible to generate the correct vector. And
painting must use the order inside the vector.
So in your example the vector would always contain
(0%|ac),(50%|bc),(50%|cc),(100%|dc) and that will generate smooth
transition from ac to bc, then abrupt change from bc to cc, followed by
smooth transition from cc to dc.
There is no ambiguity.
Kind regards,
Regina
