Rotating brushes

[stan calder]

Is it possible to rotate a brush? ........... or rotate a layer?

Thanks

[L7hope]

I don't know about a brush...But to rotate a layer just go to Layer -> Transform and then what ever you want.
Or you could use the Rotate tool.

[lamaz1928]

L7 is right. layers are easy. but what you can do to rotate a brush is somewhat simple. create a new layer, then paste your brush. rotate that one layer to your desired degree. u might have to create a new layer for each brush....but yeah

[L7hope]

Is there a way to rotate a brush without rotating the layer?
It would certainly make things faster!

[lamaz1928]

yeah.....

[Siddharth]

@lamaz u copied my words

[lamaz1928]

haha. sorray

[Gimper]

unfortunately GIMP dose not have a brush rotating feature. the only way it can be done is to rotate the layer.

[L7hope]

That's what I thought... Sucks... Oh well.

Do you think that it will be added in 2.5?

[Leo_in_NJ]

Here is a script (under Script-Fu/BrushUtil) that will rotate (and/or resize) any gbr brush. Copy the code below, paste it into a text editor (beware Notepad; it turns automatic line breaks into hard breaks, which "breaks" the script). Save it as resizebrush.scm in your scripts directory. Check the toolbox File menu/Preferences/Folders/Scripts if you don't know where it is. Restart GIMP.

I have translated the interface from Chinese to English.



;; resizebrush.scm -*-scheme-
;; resizes a (gbr)-brush
;; version 1.0 2005-11-13
;;
;; Copyright (C) 2005 by Michael Hoelzen <MichaelHoelzen@aol.com>
;; http://www.remoserv.de
;;
; This program is free software; you can redistribute it and/or modify
; it under the terms of the GNU General Public License as published by
; the Free Software Foundation; either version 2 of the License, or
; (at your option) any later version.
;
; This program is distributed in the hope that it will be useful,
; but WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
; GNU General Public License for more details.
;
; version 1.1
; the #resiZed.gbr will now be saved in the gimp-directory instead of
; the gimp-data-directory which is write-protected in unix
;
; version 1.2
; changed \\brushes\\ to /brushes/ for unix-confirmity
;
; version 1.3 Modify by James Hwang
; 加入灰階選項，讓縮放之後的筆刷也能改變顏色
;
; version 1.4 Modify by James Hwang
; 加入旋轉
;
; version 2.4 fixed for Gimp 2.4 by James Hwang
; 加入鏡射
(define (script-fu-resize-brush image drawable resFactor angSel mirror bgray?)
(define brushnameResi "#resiZed")
(define filesave (string-append "" gimp-directory "/brushes/" brushnameResi ".gbr"))
(define brushnameIn (car (gimp-context-get-brush)))
(define (testIfresiZed a)
(let* (
(len1)
(len2)
(sstr)
)
(set! len1 (string-length a))
(set! len2 (string-length brushnameResi))
(if (>= len1 len2)
(begin
(set! sstr (substring a (- len1 len2) len1))
(if (string=? sstr brushnameResi)
(begin
(set! len1 (- len1 len2))
(substring a 0 len1)
)
a
)
)
a
)
; (if (not (null? (string-search brushnameResi a)))
; (substring a 0 (string-search brushnameResi a))
; a
; )
)
)
(let* (
(actualbrush)
(layer)
(scolor)
(bcolor)
(arrayToPaint)
)
(set! actualbrush (testIfresiZed brushnameIn))
;(set! actualbrush brushnameIn)
(gimp-context-set-brush actualbrush)
(let*
(
(brushnameOut (string-append actualbrush brushnameResi))
(spacing (car (gimp-brush-get-spacing actualbrush)))
(brushDimens (gimp-brush-get-info actualbrush))
(brushWidth (car brushDimens))
(brushHeight (cadr brushDimens))
(resiZedWidth (* brushWidth resFactor))
(resiZedHeight(* brushHeight resFactor))
(centerX (/ brushWidth 2))
(centerY (/ brushHeight 2))
(centerXpluseins(+ centerX 1))
(centerYpluseins(+ centerY 1))
(angle (* angSel (/ 3.14159 180)))
)

(and (> resiZedWidth 1)(> resiZedHeight 1)
(begin
(set! arrayToPaint (cons-array 4 'double))
(aset arrayToPaint 0 centerX)
(aset arrayToPaint 1 centerY)
(aset arrayToPaint 2 centerXpluseins)
(aset arrayToPaint 3 centerYpluseins)
(set! image (car (gimp-image-new brushWidth brushHeight RGB)))
(set! layer (car (gimp-layer-new image brushWidth brushHeight 1 "layer 1" 100 0)))
(gimp-image-undo-disable image)
(gimp-image-add-layer image layer 0)
(gimp-drawable-fill layer 3)
(if (= bgray? TRUE)
(begin
(set! scolor (car (gimp-context-get-foreground)))
(set! bcolor (car (gimp-context-get-background)))
(gimp-context-set-foreground '(0 0 0))
(gimp-context-set-background '(255 255 255))
(gimp-paintbrush-default layer 4 arrayToPaint)
(gimp-image-scale image resiZedWidth resiZedHeight)
(if (not (= angle 0))
(begin
(gimp-drawable-transform-rotate-default layer angle 1 0 0 1 0)
(gimp-image-resize-to-layers image)
)
)
(cond
((= mirror 1)
(gimp-image-flip image ORIENTATION-HORIZONTAL))
((= mirror 2)
(gimp-image-flip image ORIENTATION-VERTICAL))
)
(gimp-image-convert-grayscale image)
(set! layer (car (gimp-image-flatten image)))
(gimp-context-set-foreground scolor)
(gimp-context-set-background bcolor)
)
(begin
(gimp-paintbrush-default layer 4 arrayToPaint)
(gimp-image-scale image resiZedWidth resiZedHeight)
(if (not (= angle 0))
(begin
(gimp-drawable-transform-rotate-default layer angle 1 0 0 1 0)
(gimp-image-resize-to-layers image)
)
)
(cond
((= mirror 1)
(gimp-image-flip image ORIENTATION-HORIZONTAL))
((= mirror 2)
(gimp-image-flip image ORIENTATION-VERTICAL))
)
)
)
(file-gbr-save 1 image layer filesave filesave spacing brushnameOut)
(gimp-image-undo-enable image)
(gimp-image-delete image)
(gimp-brushes-refresh)
(gimp-context-set-brush brushnameOut)))
)
)
)
;
(script-fu-register "script-fu-resize-brush"
_"_Resize Rotate Brush"
"Resize Rotate a brush, Base on resizebrush.scm by Michael Hoelzen"
"James Huang"
"James Huang"
"2008"
""
SF-IMAGE "Image" 0
SF-DRAWABLE "Drawable" 0
SF-ADJUSTMENT _"Scale Factor" '(1.0 0.1 3.0 0.1 1 1 0)
SF-ADJUSTMENT _"Rotate Degrees" '(0 -180 180 1 10 0 0)
SF-OPTION _"Transform" '("None" "Mirror" "Invert")
SF-TOGGLE "Grayscale" TRUE
;SF-ADJUSTMENT _"resFactor" '(1.0 0.1 3.0 0.1 1 1 0)
;SF-ADJUSTMENT _"Angle" '(0 0 359 1 10 0 0)
;SF-TOGGLE "Grayscale" TRUE
)
(script-fu-menu-register "script-fu-resize-brush"
_"<Image>/Script-Fu/BrushUtil")

[L7hope]

WOW! THIS IS AWESOME! (And yes I'm yelling )
Thank you so much! This is why I love open-source so much!

Oh, BTW, it also works for .abr brushes.

Thanks again!

[Leo_in_NJ]

Forgot to mention that the rotate/resize script uses the same file name every time, so if you want to save a brush permanently, you have to rename it.

[tripwire45]

This is deffo a time when this forum could use a "rep" system. Very good info, Leo. Kudos.

-Trip

[Ajit]

i haven't tested this but if it truly does work which i assume from the responses that it does, i think the code itself should be stickied. MODS?

[L7hope]

I agree with Ajit. It should also be in the gimp's add-on if it already isn't.