Hi Simon, sorry for my late reply.
As we added 3d graphs with surfaces, we indeed added a feature called "meshs",
which can be used to fill triangles with color gradients. (While there are
other mesh forms in Postscript and PDF as well, we only support triangular
meshs.)
Here is a simple example drawing a square with red, green, blue and yellow on
each of the corners (in RBG here):
from pyx import *
c = canvas.canvas()
c.insert(mesh.mesh([mesh.element([mesh.node([0, 0], color.rgb.red),
mesh.node([10, 0], color.rgb.green),
mesh.node([0, 10], color.rgb.blue)]),
mesh.element([mesh.node([10, 10], color.rgb(1, 1, 0)),
mesh.node([10, 0], color.rgb.green),
mesh.node([0, 10], color.rgb.blue)])]))
c.writePDFfile()
The mesh interpolates between the colors in the given color model linearly.
Meshs are available in Postscript and PDF, not in SVG.
Note that meshs are a "difficult" graphics feature. There are sometimes bugs in
the RIPs of printers or viewer applications. As ghostscript can rasterize those
meshs rather nicely, you can set the mesh_as_bitmap flag of the writer to
replace the mesh by a bitmap. Also note that meshs are not available in SVG.
There will always be a bitmap inserted in SVG instead of the original mesh.
(Note that in SVG there are simple gradients possible: linearly and circular
gradients similar to what you quoted from cairo in another reply in this
thread. But mesh-like color gradients on triangles are not available. Maybe
there are some tricks to "fake" this in SVG my two overlapping gradients and
using transparency, but I didn't look at it at all. The gradient features of
SVG are not available from within PyX at the moment.)
Best,
André
Am 23.01.2016 um 16:33 schrieb Simon Burton <[email protected]>:
>
> Hi Pyxers,
>
> is there a way to fill paths with a gradient, instead of a single colour?
>
> I am bravely attempting to render some stylized 3D objects and gradients sure
> would help with this.
>
> Ok, thanks.
>
> Simon.
>
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