class Cell {

  boolean state;      // alive or dead
  boolean evolution;  // next state
  boolean fixed;      // static value for QR

  public Cell(boolean s, boolean f){
    state = s;
    fixed = f;
  }

  public void preProcess(int neighbours){
    // input is number of neighbours alive
    if (state){
      evolution = (neighbours==2)||(neighbours==3);
    } 
    else {
      evolution = (neighbours==3);
    }
  }

  public void process (){
    if (!fixed)
      state = evolution;
  }
  
  public boolean isAlive(){
    return state;
  }
  
  public boolean isFixed(){
    return fixed;
  }
  
  public void randomize(){
    if (!fixed)
      state = (random(0,1)>0.5);
  }
}