Propagator.ulam

/**
\color #060
\symbol Pr
\symmetries normal
*/

element Propagator : Propagate
{
    ARGB baseCol;

    ARGB getColor(Unsigned selector)
    {
        ARGB col;
        ColorValue div = 30;
        col[1] = (ColorValue)(baseCol[1]*ip/div);
        col[2] = (ColorValue)(baseCol[2]*ip/div);
        col[3] = (ColorValue)(baseCol[3]*ip/div);
        return col;
    }

    Void emptySpace(Neighbour i)
    {
        ew[i] = ew[0];
        Atom other = ew[i];
        if(other as Propagator)
        {
            if(i < 5)
                other.ip += 2;
            else
                other.ip += 3;
            ew[i] = other;
        }
    }

    Void captureSpace(Neighbour i)
    {
        Atom other = ew[i];
        if(other as Propagator)
        { 
            // check for consuming neighbour
            InvPressure c = 100;
            // lateralneighbours have more pressure
            if(i < 5)
                c = 2;
            // diagonal neighbours have less pressure
            //  (approx. 3:2)
            else
                c = 3;
            if(other.ip > ip + c)
            {
                other = (Propagator)ew[0];
                if(other.ip + c < 256)
                    other.ip += c;
                ew[i] = other;
            }
        }
    }
}