Is there a script to create concentric circle and polygon, even better on transparent bg ? (or as path ?)

I would like use as filling for lineart they can make very dramatic BG ( just try to overlay 2 circolar concetric pattrern with a bit of offset use as BG place on top the character or a important detail so it cover the centers of the pattern ...
and voila you will draw the reader attention there.

Ok i will resurrect the scanner to post some example of pratical use...

anyway the idea is simple a render script to create concentric circles (most important) squares or polygons (more optional) as paths or at least on transparent BG, with option for the number of circles,

Is this script available PC?

If available i didn't find yet

Oh, sorry, I thought this meant there was already a script available

"there is a script to create concentric circle and polygon, even better on transparent bg ? (or as path ?)"

@PhotoComix

As a starter you could try mathmap

There is a zoom function that never seems to work properly for me but this expression does.

filter time_zoom (image in)
zoom = sin(t*pi/2);
in(xy * exp(scale(zoom, 0, 1, 4, 0)))
end

screen shot http://i.imgur.com/5VHxH.jpg - its worth playing with

And if I can throw something into the pot the coders out there
the step-resize script would be perfect *if* it saved the intermediate steps to new layers instead of scrapping them.

edit: forgot to mention, used the parametic shapes script for the polygon (and I know it is not a pentagon LOL)

The Shape Paths script (http://registry.gimp.org/node/59) can create a wide variety of shapes:

You can create concentric circles and polygons by creating a series of circles/polygons with a common center and increasing radius.

I frequently use these scripts and they work quite well.

Mahvin has written a very good tutorial for this script: http://www.mahvin.com/?p=1994

Attached is a script I wrote several years ago that can set up one of four paths:
- a path consisting of shaped lines following an initial selection
- a path consisting of concentric circles filling the image
- a path made of horizontal lines
- a path made of vertical lines
using a specified spacing for the path lines.

It shows up under "Filters>Artistic>Mosaic Tile Helper"

The scipt will (optionally) stroke the path with the current pen, but this has limited value, as the tiles will all be one colour. It is best used be having it leave the path then using the stroke path command after setting up the active paintbrush to use the rotating tile set I provided earlier in the post, along with the "use gradient" colour option in the paintbrush.

Here are some samples (brush spacing increased so you see the dot of each brush):


I made this script to help with creating "fake mosaics", hence its name:


-Rob A>

That is kewl RobA, thank you

Crazy wonderful cool Rob. Going to give this one a try later. Thanks.

I just realized what you are going after PC. G'MIC has a cool preset called Edges Offset that you might be able to use for your needs.

Awesome script, Rob! Thanks again.

BTW, can I host your collection of GIMP scripts on my site as an alternate download location?

So much replies while i was fighting with the cables and driver of my old scanner, thank to everybody !

@Rich

I didn't thought about mathmap, that may be a cool idea

@BKH
i forgot about that script i even have installed.
Sure it can work and thank to remind me that path suite will anyway come handy

@RobA

that seems perfect.
From the description you give there is nothing to tweak it already does what i was looking for and much more.
And your examples are really exciting, i am going to try at soon i finish the reply

@Ljleyk

I know that Gmic filter since i requested,there the idea was a bit different
= fill a selection or anyway outlines (clearly marked as in line art) with concentric shapes the closest identical to selection or outlines shapes the innermost rounded if needed.

I believe that if would have worked could be a killer filter for decorations and a lot of special effect
BUT ...doesn't work well:
too often many of the concentric lines get broken ,disjointed .and that really spoil the intended effect

I did try to ask David to fix, but with no any luck

It sort of work only with most simple shapes (as your rectangle ) and even than with not all combination of thickness and numbers of concentric lines (and no way to guess which combination will work and which will result in series of disjointed lines )
Really a pity because in a framework as GMIC (Preview, possibility of multiple input/output, and with a bit of fiddling to animate the filters ) would be perfect

That's cool PC; RobA's Script is pretty cool. Did this one using it (filled in the voids with the Voronoi command line program).

ref: http://www.fontplay.com/freephotos/sixt ... 06-001.jpg

Lyle, that is fabulous. Beautiful.

I did a kind of sloppy try with RobA's script. I intend to work more with it to see what I can do though.

One can generate concentric squares and circles using the Blend Tool set to create "Square" or "Radial" gradients respectively, and to repeat with "Triangular wave". If the "Hard-edged Gradient" is available, use that; otherwise you will want to use the default gradient (and FG/BG colors) and perform a "Colors->Threshold" after creating your gradient. (The Blend Tool can also be used similarly to create spirals.)

To create these designs as a path, generate them on the Quickmask and they will become a selection when you exit Quickmask mode. You can then perform a "Select->To Path".

Thanks O; like your colorful try too. I see Saul posted too and now realized that I forgot to mentioned that I used Saul's mean fill script-fu to get the filled colors.

I know several members here have helpful websites. Is there a location here on gimpchat with links to all these sites? It would be great if there was, with maybe a quick explanation of what can be found on that site. Just an idea.

That's exactly what my script does! Then I select by colour and then convert the selection to a path.

-Rob A>

RobA

something weird happened (there are the concetric circles but with reddish filling ) but maybe because i did something wrong,

Well i will try again now (btw i used the script with gimp 2.7.4 ) just a quick question i wish the circle on transparent BG did the script remove alpha ? Or use red as default stroking color ?

Not sure. In 2.6 it just displays the path (purple) is that what you see?

-Rob A>