Gradient Color for Patch(es) Glyph

Is it possible to fill patches with gradient color? I’ve looked around the documentation and can’t find details on gradient, and the closest I found in SO is gradient background for plot here - it is not supported. Just want to confirm.

The reason I’m asking is that I’m creating sort of a flow diagram where the color will change from one end of the patch to the other.

Thank you

Maybe? Bokeh recently added support for hatching fill patterns. In addition to those built in line patterns, you can also specify an arbitrary custom image texture to tile. So you could potentially use a gradient image as a fill pattern now. The issue I think that may make a gradient challenging is that there is no way to scale the image based on anything, so if the patch grows or shrinks (either because of zooming, or from a responsive plot sizing mode) then it will move “around” the gradient. However, if you have control over the sizes of things, you can probably make something work.

As an aside if you can point to the SO question, it would be good to update it with this information.

Thank you for your reply, I just updated the question with SO link. Also, I managed to experiment with fill pattern:

57%20PM1360×720 71.6 KB

If in the future there is somehow a way to specify color to each point in the patch (so gradient is auto created, then it’ll be nice (maybe))

Sorry @Bryan can you help to check if hatch pattern can be applied to Patches too?
My code works for Patch but not Patches (I received bad column name error for custom image texture). If I specify hatch_pattern=“dot”, it works fine for Patches.

ERROR:bokeh.core.validation.check:E-1001 (BAD_COLUMN_NAME): Glyph refers to nonexistent column name. This could either be due to a misspelling or typo, or due to an expected column being missing. : key “hatch_pattern” value “image” [renderer: GlyphRenderer(id=‘5675’, …)]

I’m honestly not sure if hatch patterns with custom images can be “vectorized”. The linked example, for instance, plots a separate vbar for each. If you post a complete minimal test script I can try to experiment but it may not be possible.