Ok, the latest trunk (0.48+devel+12780+44~ubuntu13.04.1) renders objectBoundingBox gradients correctly.
However, as su_v pointed out, Inkscape doesn't really support these when editing. As soon as I edit the gradient on-canvas, or move the object associated with the gradient, the gradient immediately reverts to userSpaceOnUse. This is pretty annoying, because it takes a little while to set up the coordinates by hand, only to have Inkscape destroy them on the slightest interaction.
I guess this is a "feature not a bug", in that I'm using Inkscape in a slightly unusual way. However, I'd be keen to (have someone) add a feature to allow this usage. Could anyone give me some pointers on where to start looking in the code, how big a job this might be, and perhaps if there is someone else out there who might be keen to implement the feature?
- Bryan
On Thu, Oct 31, 2013 at 11:12 PM, su_v <suv-sf@...58...> wrote:
On 2013-10-31 04:20 +0200, Bryan Hoyt | Brush Technology wrote:
If I create a gradient in Inkscape, the default coordinate space is userSpaceOnUse, as opposed to objectBoundingBox (see
https://developer.mozilla.org/en-US/docs/Web/SVG/Attribute/gradientUnits).
This is ok, but if I edit a gradient manually (via a text editor or the XML editor) to change it to objectBoundingBox coordinates, I would like it to stay that way.
objectBoundingBox gradients are very useful if you want to animate or otherwise interact with the SVG using javascript in a browser -- the gradient will move relative to the object, and you don't have to write extra complicated code to try and keep it lined up.
Currently, *a)* Inkscape initially renders the gradient nodes in the correct position, but does not render the gradient colours themselves. So the object has a flat colour.
Please attach a sample SVG file - based on your other email I guess this refers to Inkscape trunk, too: which revision of trunk are you currently using?
Note: there had been regressions wrt to rendering gradients which use 'objectBoundingBox' in trunk (rev >= 12528), but AFAIK those have been fixed again (rev >= 12646).
*b) *As soon as I drag one of the endpoints, it reverts to userSpaceOnUse coordinates.
Inkscape only supports 'userSpaceOnUse' when writing gradient definitions.
Which means that it becomes quite difficult to edit my SVG file in Inkscape ever after! Ideally, the object would be coloured correctly, and if I move a node or endpoint, it would remain in objectBoundingBox coordinates.
Better yet, there would be a way to switch to objectBoundingBox coordinates from within the GUI, to avoid having to calculate the conversion maths in the XML editor.