boolean pause = false;
boolean showneighborhood = false;
boolean showvelocity = true;
boolean showinfluence = true;
boolean showagent = true;
boolean avoidmouse = false;
boolean drawbackground = true;
boolean boidswalk = false;
boolean addboid = false;

void keyPressed() {
  switch (key) {

  case ' ':
    pause = !pause;
    break;
  
  case 'n':
  case 'N':
    showneighborhood = !showneighborhood;
    break;
  
  case 'v':
  case 'V':
    showvelocity = !showvelocity;
    break;
  
  case 'i':
  case 'I':
    showinfluence = !showinfluence;
    break;
  
  case 'm':
  case 'M':
    avoidmouse = !avoidmouse;
    break;
  
  case 'a':
  case 'A':
    showagent = !showagent;
    break;
  
  case 'b':
  case 'B':
    drawbackground = !drawbackground;
    break;

  case 'k':
  case 'K':
    initialNumberOfBoids = 0;
    boids.removeAll();
    break;
  
  case 's':
  case 'S':
    addboid = !addboid;
    break;

  case 'r':
  case 'R':
    noiseWeight = (noiseWeight > 0) ? 0.0 : 1.0;
    break;

  case 'w':
  case 'W':
    boidswalk = !boidswalk;
    break;

  case 'z':
  case 'Z':
    boids.setVelocity(new Vector(0,0));
    break;

  case '<':
    boidSize -= 1;
    boidSize = constrain(boidSize,0,100);
    updateNeighborhood();
    break;
  case '>':
    boidSize += 1;
    boidSize = constrain(boidSize,0,100);
    updateNeighborhood();
    break;
    
  case CODED:
    switch (keyCode) {
    case UP:
      boids.addInfluence(new Vector(0, -0.5));
      break;
    
    case DOWN:
      boids.addInfluence(new Vector(0, 0.5));
      break;
    
    case RIGHT:
      boids.addInfluence(new Vector(0.5, 0));
      break;
    
    case LEFT:
      boids.addInfluence(new Vector(-0.5, 0));
      break;

    default:
      println("Coded key pressed: <" + keyCode + "> ");
    }
    break;

  default:
    println("Key Pressed: <" + key + ">");
  }  
}