Cornu and CoreImage

Love the CoreImage library!

But I've been trying to use draw a Cornu path into a layer and it doesn't seem to work. It seems to get drawn directly to the screen ignoring the canvas.

I tried this:

l = canvas.layer(cornu.drawpath(path,tweaks=10, points=False),foreground=color(1))

and for the redord I also tried canvas.layer_path!

Hi Brendan,

Yes, the cornu.drawpath() command draws directly to the screen. However, it's very easy to fix this. I'll upload a new version of the Cornu library next week so you can use Cornu curves as a layer.

That's great Tom and thanks once again for creating an incredibly powerful library.

Brendan, there is an update of the Cornu library online. It has a new path() command that returns a path object instead of drawing to the screen. The returned object can be used as input for a Core Image layer.

Here's some example code that draws an S-like Cornu shape as a pixel layer:

size(400,400)
 
coreimage = ximport("coreimage")
cornu = ximport("cornu")
 
c = coreimage.canvas(WIDTH, HEIGHT)
c.layer_fill(coreimage.color(0))
 
pts = [(0.5, 0.5), (0.3, 0.1),
       (0.1, 0.3), (0.1, 0.1)]
 
p = cornu.path(pts, close=False)
l = c.layer_path(p, foreground=coreimage.transparent(), stroke=color(1), strokewidth=10)
 
l.rotate(90)
c.draw()

wow! Fantastic - cheers