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Re: Canvas line style comments

From: Ian Hickson <ian@hixie.ch>
Date: Fri, 13 Jun 2008 08:50:13 +0000 (UTC)
To: Philip Taylor <pjt47@cam.ac.uk>
Cc: HTML WG <public-html@w3.org>
Message-ID: <Pine.LNX.4.62.0806130842040.8559@hixie.dreamhostps.com>

On Thu, 29 May 2008, Philip Taylor wrote:
> The spec says: "The lineCap attribute defines the type of endings that 
> UAs will place on the end of lines. The three valid values are butt, 
> round, and square. The butt value means that the end of each line is a 
> flat edge perpendicular to the direction of the line. The round value 
> ..."
> That doesn't give any clear "must" requirements for butts. (Nothing else 
> defines precisely how lines are to be rendered, so this isn't just a 
> statement of a consequence of a specified line-drawing algorithm, so it 
> should say "must" here else there won't be any testable requirements for 
> lineCap=butt.)

It is intended to be a consequence of the lack of any capping. I've 
clarified this, but I haven't added a must -- I don't know what the must 
would be. Is line rendering really not testable?

> "The miter limit ratio is the maximum allowed ratio of the length of the 
> two continuation lines to the line width" is wrong - it's the maximum 
> allowed ratio of the miter length to half the line width (e.g. when 
> mitering a right angle the critical point is miterLimit=sqrt(2)).

Um, ok. I'm taking your word on this! Please check that the spec is now 

> "If the miter length would be exceeded" - s/length/limit ratio/

Fixed, ish. Please check that what I wrote made sense.

> In the definition of 'miter': s/abuting/abutting/

Already fixed.

Ian Hickson               U+1047E                )\._.,--....,'``.    fL
http://ln.hixie.ch/       U+263A                /,   _.. \   _\  ;`._ ,.
Things that are impossible just take longer.   `._.-(,_..'--(,_..'`-.;.'
Received on Friday, 13 June 2008 08:50:55 UTC

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