W3C home > Mailing lists > Public > www-svg@w3.org > April 2002

RE: rel and absolute.

From: <DPawson@rnib.org.uk>
Date: Tue, 9 Apr 2002 15:48:00 +0100
Message-ID: <9B66BBD37D5DD411B8CE00508B69700F024A7413@PBOROLOCAL>
To: tobiasreif@pinkjuice.com, www-svg@w3.org
Tobias wrote:
> ... so it's
> 
> <svg viewBox="0 0 100 100">
> <path
>   style='stroke:black;fill:none'
>        d="M 10 10 l 10,10  c 0,20   40,0  0,-20"/>
> <path d="M 10 10 L 20,20  C 20,40  60,20  20,0"
>   style="stroke: red; fill:none"/>
> </svg>

My reasoning goes something like:

The first and second control points are relative to the last
point (in this case a relative move provided by the l command),
so starting at 10 10, the line is to 20,20 (ref point for 
the bezier).
The control points for the curve are then relative to this point.



and I've just found out that successive cubic beziers
update the X,Y position after each triple ;-)

hence M 0,0 c cp1 cp2 ep cp3 cp4 ep

control point 3 (cp3)  is relative to ep (the end point of the first curve).
This rolls on until the next absolute position, or change of command!
  
Fun this :-)
HTH
Regards DaveP 

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Received on Tuesday, 9 April 2002 10:51:23 GMT

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