ZDoom

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function int abs(int x)
{
  if (x>=0) return x;
  return -x;
}

function int min(int x, int y)
{
    if (x<y) return x;
    else return y;
}

function int AproxDistance(int dx, int dy)
{
	int dx = abs(dx);
	int dy = abs(dy);
	return dx+dy-(min(dx,dy)>>1);
}

function void GetDistance(int tid)
{
    int x=abs(GetActorX(tid)-GetActorX(activatortid()));
    int y=abs(GetActorY(tid)-GetActorY(activatortid()));
    int z=abs(GetActorZ(tid)-GetActorZ(activatortid()));

    return AproxDistance(AproxDistance(x,y), z);
}