Direction of marker orient="auto" is unclear for vertex marker-mid in SVG2

Hi all,

SVG1.1 has
"If there is a path segment coming into the vertex and another path 
segment going out of the vertex, the marker's positive x-axis should 
point toward the angle bisector for the angle at the given vertex, where 
that angle has one side consisting of tangent vector for the path 
segment going into the vertex and the other side the tangent vector for 
the path segment going out of the vertex."
in section 11.6.2 The ‘marker’ element

For example for the path d="M10,10 h10 v40" I get an incoming angle of 
0° and an outgoing angle of 270°. That results in a marker direction of 
315°. At least Seamonkey 2.21 and IE10 render it that way.

But in section "11.7.1. The ‘marker’ element" of 
https://svgwg.org/svg2-draft/painting.html I now read
"A value of 'auto' indicates that the marker is oriented such that its 
positive x-axis is pointing in the direction of the path at the point it 
is placed."
Here it is not clear, what "direction of the path" is, because in a 
corner a 'direction' is undefined.

And an additional remark: I miss in https://svgwg.org/svg2-draft a rule, 
how vertex markers are drawn on a sequence of moveto commands, for 
example on d="M10,10 m10,10 m10,20 m10,40".

Kind regards
Regina

Received on Sunday, 29 September 2013 13:20:15 UTC