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From Andreas Neumann <neum...@karto.baug.ethz.ch>
Subject Re: Question about stroke-dashing
Date Mon, 12 Jun 2006 09:54:25 GMT
Thank you for your additional input. I will take it into account when 
rewriting this section. I will send you a revised version for review.

The vector effects is a good example where the directionality matters.

Thanks again,

>   This is a little like asking, why do we use positive numbers instead
>of negative numbers.  If you just negate everything it works, right?
>   From a mathematical point of view I think it is very odd to specify
>your basic shapes such that they have negative area.  This also means
>that the winding count for the interior of the basic shapes is negative 
>rather than positive.
>   If the whole world buys into this system then there are probably no 
>problems but when you consider things like vector effects where basic 
>shapes can now be used/combined with other shapes I think you are 
>likely to generate confusion among users.  Like for boolean operations 
>if you intersected a primitive rect with another 'properly defined' 
>shape you would likely end up with the portion of the shape outside 
>of the rect (it might be possible so force implementations to 
>'normalize' shapes according to winding rule before boolean 
>    This also could lead to missing or extra holes when paths are 
>combined because folks are likely to be surprised that the primitive 
>shapes decrement winding count rather than increment.
>   In the end I suspect it will be viewed as short sighted to go 
>"against the math" just because people would rather have shapes 
>go clockwise.
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Andreas Neumann
Institute of Cartography
ETH Zurich
Wolfgang-Paulistrasse 15
CH-8093  Zurich, Switzerland

Phone: ++41-44-633 3031, Fax: ++41-44-633 1153
e-mail: neumann@karto.baug.ethz.ch
www: http://www.carto.net/neumann/
SVG.Open: http://www.svgopen.org/
Carto.net: http://www.carto.net/

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