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# akkana/gimp-plugins

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 #!/usr/bin/env python # life.py: Play Conway's Game of Life on your image. # Copyright 2010 by Akkana Peck, http://www.shallowsky.com/software/ # You may use and distribute this plug-in under the terms of the GPL. # # Thanks to Joao Bueno for some excellent tips on speeding up # pixel ops in gimp-python! import math import time from gimpfu import * from array import array import sys # only needed for debugging # FACTOR should be 256. * 3. if you want to use only black and white. # Needs to be adjusted for colors, though. # And also for image type (currently assumes nchannels == 3). #FACTOR = 255 * 3. # Life rules, adjusted for RGB (each neighbor can contribute up to 255*3) NOTALIVE = 600 LONELY = 1230 NEWBORN = 1600 OVERCROWDED = 2295 NEWPXL = array("B", [ 180, 255, 180 ]) DYINGPXL = array("B", [ 80, 30, 30 ]) BLACK = array("B", [ 0, 0, 0 ]) def CA_rule(pixels, x, y, pos, width, height, nchannels=3) : oldval = pixels[pos : pos + nchannels] sumoldval = float(sum(oldval)) #print pos, sumoldval # Calculate new value based on Life rules neighbors = 0 for xx in range(x-1, x+2) : for yy in range(y-1, y+2) : if xx == x and yy == y : continue # don't include self in sum dpos = (xx + width * yy) * nchannels s = int(sum(pixels[dpos : dpos + nchannels]) + .5) neighbors += s #print "(%d, %d): [%-3d %-3d %-3d]=%-3d, neighbors %-4d" % \ # (x, y, oldval[0], oldval[1], oldval[2], sumoldval, neighbors) #sys.stdout.flush() if neighbors < LONELY or neighbors > OVERCROWDED : # Pixel dies if sumoldval > NOTALIVE : return DYINGPXL else : # It is so ridiculous that python arrays can't handle # mathematical ops like oldval / 2 return array("B", [ oldval[0]/2, oldval[1]/2, oldval[2]/2 ]) elif sumoldval < NOTALIVE and neighbors > NEWBORN : # New one born return NEWPXL else : # pixel stays the same return oldval def python_life_step(img, layer) : sys.stdout.flush() gimp.progress_init("Playing life ...") pdb.gimp_image_undo_group_start(img) width, height = layer.width, layer.height src_rgn = layer.get_pixel_rgn(0, 0, width, height, False, False) nchannels = len(src_rgn[0,0]) src_pixels = array("B", src_rgn[0:width, 0:height]) dst_rgn = layer.get_pixel_rgn(0, 0, width, height, True, True) dst_pixels = array("B", "\x00" * (width * height * nchannels)) # Loop over the region: for x in xrange(0, width - 1) : for y in xrange(0, height) : pos = (x + width * y) * nchannels dst_pixels[pos : pos + nchannels] = CA_rule(src_pixels, x, y, pos, width, height, nchannels) progress = float(x)/layer.width if (int(progress * 100) % 20 == 0) : gimp.progress_update(progress) # Copy the whole array back to the pixel region: dst_rgn[0:width, 0:height] = dst_pixels.tostring() layer.flush() layer.merge_shadow(True) layer.update(0, 0, width, height) pdb.gimp_image_undo_group_end(img) pdb.gimp_progress_end() pdb.gimp_displays_flush() import gtk class LifeWindow(gtk.Window): def __init__ (self, img, layer, *args): self.running = False self.img = img self.layer = layer win = gtk.Window.__init__(self, *args) self.set_border_width(10) # Obey the window manager quit signal: self.connect("destroy", gtk.main_quit) # Make the UI vbox = gtk.VBox(spacing=10, homogeneous=True) self.add(vbox) label = gtk.Label("Conway's Game of Life") vbox.add(label) label.show() hbox = gtk.HBox(spacing=20) btn = gtk.Button("Run") hbox.add(btn) btn.show() btn.connect("clicked", self.runstoplife) btn = gtk.Button("Single step") hbox.add(btn) btn.show() btn.connect("clicked", self.steplife) btn = gtk.Button("Cancel") hbox.add(btn) btn.show() btn.connect("clicked", gtk.main_quit) vbox.add(hbox) hbox.show() vbox.show() self.show() return win def steplife(self, widget) : python_life_step(self.img, self.layer) def runstoplife(self, widget) : if self.running : widget.set_label("Run") self.running = False return self.running = True widget.set_label("Stop") while self.running : python_life_step(self.img, self.layer) # Handle any button presses that have happened while we were busy while gtk.events_pending() : gtk.main_iteration() def python_life(img, layer) : l = LifeWindow(img, layer) gtk.main() register( "python_fu_life", "Conway's game of Life", "Conway's game of Life", "Akkana Peck", "Akkana Peck", "2010", "/Filters/Map/Life...", "RGB", # Adjust for other types when code is more flexible [ ], [], python_life) main()
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