ISSUE-2301: Text on a path layout rules unclear wrt startpoint-on-the-path and text-anchor (svg2)
Text on a path layout rules unclear wrt startpoint-on-the-path and text-anchor (svg2)
- State:
- RAISED
- Product:
- SVG 2
- Raised by:
- Erik Dahlström
- Opened on:
- 2009-11-23
- Description:
- This is duplicated from ISSUE-2299 (for Core2):
Trying to work out the correct behavior for the following testcase:
<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<path id="tp" d="M50 100c100 400 400 -100 600 200" fill="none" stroke="black"/>
<text x="200"><textPath xlink:href="#tp" text-anchor="middle" startOffset="50%">hello world</textPath></text>
</svg>
I think the spec may be in conflict with itself (from text-on-a-path layout rules):
[[
Before rendering the first glyph, the horizontal component of the startpoint-on-the-path is adjusted to take into account various horizontal alignment text properties and attributes, such as a dx attribute value on a 'tspan' element. (In the picture above, the startpoint-on-the-path is the leftmost dot on the path.)
]]
and furthermore:
[[
When the inline-progression-direction is horizontal, then any x attributes on 'text', 'tspan', 'tref' or 'altGlyph' elements represent new absolute offsets along the path, thus providing explicit new values for startpoint-on-the-path.
]]
Now, should x="200" be the startpoint-on-the-path, or should it be an offset from the startpoint-on-the-path (startOffset=50%), should it be ignored, or should it be handled in some other way?
It seems we have at least three different behaviors in current UA:s.
[1] http://dev.w3.org/SVG/profiles/1.1F2/publish/text.html#TextpathLayoutRules - Related Actions Items:
- No related actions
- Related emails:
- Fwd: Minutes, SVG Telcon, 23 Nov 2009 (from codedread@gmail.com on 2009-11-25)
- Minutes, SVG Telcon, 23 Nov 2009 (from schepers@w3.org on 2009-11-25)
- ISSUE-2301: Text on a path layout rules unclear wrt startpoint-on-the-path and text-anchor (svg2) [SVG Core 2.0] (from sysbot+tracker@w3.org on 2009-11-23)
Related notes:
No additional notes.
Display change log
