PImage MyImage; //define an image
int [][] memory; //use it as a copy of the image’s data
void setup(){
size(400,400);
MyImage = createImage(width, height, RGB);
for(int x=0; x<width; x++)
for(int y=0; y<height; y++){
if(random(1)>0.5) //create a random bitmap
set(x,y,color(0,0,0));
else
set(x,y,color(255,255,255));
}
memory = new int[width][height];
}
void draw(){
image(MyImage,0,0); //just draw the image in its new state
}
int gen = 0; //marks the number of generations
void keyPressed(){
for(int x=5; x<width-5; x++) //go through all pixels
for(int y=5; y<height-5; y++){
int k=0;
for(int i=-1; i<=1; i++) //go through all 8-neighbors
for(int j=-1; j<=1; j++){
if(i==0 && j==0)continue; //skip if the same one
color c = get(x+i,y+j); //if the neighbor is black
if(red(c)==0.)k++; //add it to the counter
}
if(k==3) //if all black neighbors are exactly 3
memory[x][y]=0; //become black
else if(k>=5) //if all black neighbors are greater or equal to
memory[x][y]=255; //become white
}
for(int x=0; x<width; x++)
for(int y=0; y<height; y++)
set(x,y,color(memory[x][y])); //copy memory[] to image
println(gen++);
}