I know how to program the two-color one-dimensional Cellular Automata. I put the code of the two-color below.

Can anyone help me to write a program that implements three-color totalistic one-dimensional CA?

Thanks

The code of the two-color is:

int y;

int rule=129;

void setup()

{

  size(256,256,P3D);

  background(0);

  set(width/2,0,~0);

}

void draw()

{

  for(int x=1; x<width-1; x++)

  {

    int pix1= (get(x-1,y)&1)<<2;

    int pix2= (get(x,y)&1)<<1;

    int pix3=  get(x+1,y)&1;

    int bits=pix1+pix2+pix3;

    if((rule&(1<<(bits)))>0)    //test pattern in rule

      set(x,y+1,~0);

  }

  if(++y>height)

  exit();

}