Re: Rendering of marker-start at the beginning of a subpath

Paul LeBeau:
> That's the sentence I was referring to in my post.  That is later seemingly
> contradicted (or clarified?) by the paragraph I posted.  It tends to
> suggest that it may have been intended that start and end markers applied
> to all subpaths.

Do you mean sentences in the same paragraph:
"Note that for a 'path' element which ends with a closed sub-path, the last 
vertex is the same as the initial vertex on the given sub-path. In this case, 
if 'marker-end' does not equal none, then it is possible that two markers 
will be rendered on the given vertex."

I cannot see a contradiction (nevertheless, the usage of 'sub-path' can
be a little bit confusing, but logically it does not cause a problem together 
with the initial definition), it only notes, that it is possible, that this 
happens.  This does not implicate a specific behaviour for sub-paths.
I clarifies basically, that closed paths have an initial and final point as
other paths and not just one for both.
The Z-command implicates, that the initial point of the sub-path
is the same as the final (and implicates something for some 
stroke-properties as well, but obviously not for markers - but
currently one cannot have different linecaps at the begin or end of
the path anyway and if closed the linejoin applies instead).
Now there can be four different cases (assuming different markers
for begin, end and mid):
a) The initial point of the sub-path is the initial point of
the complete path and the final point of the sub-path is
the final point of the complete path - in this case, the markers for begin 
and end are drawn at the same vertex.
b) The initial point of the sub-path is not the initial point of
the complete path and the final point of the sub-path is
the final point of the complete path - in this cae, a marker for mid and
end are drawn at the same vertex.
c) The initial point of the sub-path is the initial point of
the complete path and the final point of the sub-path is
not the final point of the complete path - in this case, a marker for
begin and mid are drawn at the same vertex.
d) The initial point of the sub-path is not the initial point of
the complete path and the final point of the sub-path is
not the final point of the complete path - in this case,
two mid markers have a coincidence - because they are
of the same type, nothing interesting will result from
this. 

Olaf

Received on Thursday, 26 September 2013 15:13:33 UTC