topic Re: Define scale of gradient fill in Libraries & objects

Define scale of gradient fill

derekjackson — Tue, 20 Jul 2010 08:19:43 GMT

Hi,
I can't seem to find a way of defining the extent of a radial gradient fill.

My code is:

	DEFINE RADIAL_GRADIENT_FILL "treetop"

	FILL "treetop"

	poly2_b{2} 2,2,fill_pen_col,back_pen, 0,0,180,
	0,0,901,
	1.5,360,4001

Although poly2_b{2} lets me define the origin and angle, there's nothing to say how far the gradient reaches. What I'm after is a radial gradient in the circle that starts in the centre and finishes at the radius of the circle - currently, it just seems to stop about halfway.

Should this be defined in the RADIAL_GRADIENT_FILL definition, or in the poly2_b{2} command?

Thanks,

Derek

Re: Define scale of gradient fill

ztaskai — Tue, 20 Jul 2010 14:06:51 GMT

Hi,

The solution is in the POLY2_B{4} and {5} variants. POLY2_B{2} is older than the gradient fill, consequently it cannot control the gradient length.

Regs,

Re: Define scale of gradient fill

derekjackson — Tue, 20 Jul 2010 14:11:38 GMT

Could you give me an example of POLY2_B{5} in use, or a link to an online reference? I can't find it in the manual...

Thanks!

Re: Define scale of gradient fill

ztaskai — Tue, 20 Jul 2010 15:39:37 GMT

v14 GDL manual: http://download.graphisoft.com/ftp/gdl/manual/14

POLY2_B{5} in v14 GDL manual: http://download.graphisoft.com/ftp/gdl/manual/14/wwhelp/wwhimpl/common/html/wwhelp.htm?context=AC14_GDL_Help&file=05_GDL.5.12.html

As far as I can remember, the length of the direction vector sets the transition length for linear gradients.

Regs,

Re: Define scale of gradient fill

derekjackson — Wed, 21 Jul 2010 12:35:30 GMT

Thanks Zsolt. We're still using AC12 - can I still use POLY2_B{5}?

It keeps giving me a "Bad (unimplemented) command version" warning...

Re: Define scale of gradient fill

ztaskai — Thu, 22 Jul 2010 07:18:40 GMT

poly2_b{5} was added in AC13 😞

Experiment a bit with the fill distortion matrix in the {4} poly2_b version. I never did that but I think it has the same way for controlling the transient length.

Sorry, I'm of this little help...

Regs,

Re: Define scale of gradient fill

derekjackson — Thu, 22 Jul 2010 07:54:04 GMT

Cheers.

I've managed to fully control the linear gradient using POLY2_B{4}, but no luck as yet on the radial.

Changing the mxx, mxy, myx, myy values seems to let me double the extent of the radial gradient, but no more - can't yet get it to reach to the full extent of the object. If anyone has managed it in AC12, please let me know how...

Thanks,

Derek