[html5] Points in a <CANVAS> element
John S. Urban
urbanjost at comcast.net
Thu Jan 31 19:41:31 PST 2008
The HTML5 specification appears to say to ignore a line composed of just a moveTo() call in a <CANVAS> element,
but both the opera(1) and firefox(1) browsers appear to ignore any polyline that does not change the position. That is,
does not produce a point. I think it should.
I have been collecting my experiences with the <CANVAS> implementations in the opera(1) and firefox(1) browsers at
where I have this note ...
# POINTS: Neither browser showed a line of zero length, even when it contained two points (The HTML5 proposal currently says to ignore a path with "less than two" points in it; it does not imply lines of null length are ignored though). In order to make points easy to render I think a path composed of just a move and/or a move and then draws(s) to the same point should show a circle with a diameter equal to the current line width or a square with a side equal to the current line width or a minimum of one unit (or pixel) in order to make points visible. Maybe an option to display markers of different styles at such "points" would be nice (an X, a +, a hollow circle, ...)
that makes simple points show up. Does anyone else think the browsers are wrong in not making a point or marker
to represent polylines whose elements all have the same coordinates?
Why would someone put a moveTo() in a file without intending it to render something?
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