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Re: Fwd: Question on gradient userSpaceOnUse

From: Jeff Schiller <codedread@gmail.com>
Date: Tue, 5 Jan 2010 07:32:24 -0600
Message-ID: <da131fde1001050532qf35636ay93ef200ac26d3075@mail.gmail.com>
To: Erik Dahlstrom <ed@opera.com>
Cc: www-svg <www-svg@w3.org>, Alex Danilo <alex@abbra.com>
The fact that you moved the scale to a parent g with no differences is weird
to me.  Note that there is already a translate of 100,100 on a parent
element that has NO apparent effect on the rects user space

On Jan 5, 2010 4:08 AM, "Erik Dahlstrom" <ed@opera.com> wrote:

On Tue, 05 Jan 2010 09:18:17 +0100, Alex Danilo <alex@abbra.com> wrote: >
--Original Message--: >> ...

>> >> The spec says userSpaceOnUse "shall represent values in the coordinate
>> system that results...
Just to test for consistency I also verified that moving the transform
attribute from the rect in the example Jeff posted up to a surrounding g
element does the same thing. Basically confirming that the current user
space includes the transform on the element itself too. All viewers I tested
displayed the gradients it the same way as in Jeff's original example.

I also added a couple of lines to illustrate what the spec says the gradient
vector should be.

Modified example:

<?xml version="1.0"?> <svg xmlns="http://www.w3.org/2000/svg"

   <g transform="scale(0.25,1)">      <rect width="400" height="50"
fill="url(#g1)" />      <!-- sh...
     <line x1="0" y1="0" x2="400" y2="50" stroke="black"/>

   <rect y="100" width="100" height="50" fill="url(#g2)" />

   <!-- show the gradient vector in current user space -->
   <line x1="0" y1="100" x2="100" y2="150" stroke="black"/>


> There is clarification for the weird perpendicular behaviour of > the
gradients for 'objectBound...
I agree that it makes sense to make the gradient perpendicular to the
gradient vector for both 'objectBoundingBox' and 'userSpaceOnUse'.


/Erik -- Erik Dahlstrom, Core Technology Developer, Opera Software Co-Chair,
W3C SVG Working Grou...
Received on Tuesday, 5 January 2010 13:32:59 UTC

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