Alpha channel in linear and radial gradients

MauriceMeilleur

I've been using DrawBot to generate diagrams—specifically, Boolean diagrams of categories with fuzzy boundaries—and I would love to see both linear and radial gradients incorporate an alpha channel.

frederik

continue here: https://github.com/typemytype/drawbot/issues/355

frederik

what does work:

im = ImageObject()

im.linearGradient((300, 300), (50, 0), (300, 0), color0=(1, 0, 0, 1), color1=(0, 1, 0, .3))

fontSize(100)
text("Hello World", (0, 30))

image(im, (0, 0))

This creates a image with a gradient with opacity. But it will be a lot slower...

Screen Shot 2020-01-27 at 12.10.47.png

MauriceMeilleur

@frederik Thanks (and thanks for opening this over in the GitHub repo). I'll give it a try later today. Speed isn't a factor in this case because I'm generating static diagrams.