Re: [Gegl-developer] params of gegl:transform operation

[beee <gdb_1986 163 com>]

Dear Michael,

Thanks for your kindly help. I have another question: How can I fill a region with gradient color using gegl?

Best Regards.
At 2013-09-29 21:55:00,"Michael Henning" <drawoc darkrefraction com> wrote:
> To use gegl:transform, you need to create the transformation matrix
> yourself. There are plenty of tutorials for learning how to create
> transformation matrices online.
>
> Then, do this to set the node's property:
>
> 1. When you create your matrix, place it in a GeglMatrix3 struct. It
> contains one member named coeff, which is a 3x3 array of doubles for
> the matrix values.
> 2. Turn the matrix into a string with gchar* gegl_matrix3_to_string
> (GeglMatrix3 *matrix);
> 3. Set this string as the property "transform" on your gegl:transform
> node with gegl_node_set.
> 4. Free the string from (2) with g_free
>
> Anyway, I hope this helps! Feel free to ask if you have any issues.
>
>  -- drawoc
>
> On Sun, Sep 29, 2013 at 6:06 AM, beee <gdb_1986 163 com> wrote:
> >  Hi,
> >
> > I want to apply perspective effects on an image. But I can't find an
> > operation for it. I thought maybe I can do it with gegl:transform. But I
> > don't know which parameters should use.
> >
> > Please help. Thanks!
> >
> > Regards.
> >
> >
> >
> >
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