/*
 * ARTS 102 - Aesthetics of the Algorithmic Image
 * Johannes Goerz (johannes.goerz@gmail.com)
 * 2005-12-04
 */
 
Tentacle[] t;
int maxtentacles, framecounter, life;
int[][] startpoints;
Vector target;
boolean showcenter;

void setup() {
  // general procesing parameters
  size(400,600);
  smooth();
  background(0);
  framerate(25);
  noStroke();

  // animation parameters
  maxtentacles = 6;
  life = 25;
  
  // setup starting positions;  
  startpoints = new int[2][2];
  startpoints[0][0] = width/2;
  startpoints[0][1] = 80;
  startpoints[1][0] = width/2;
  startpoints[1][1] = height-80;

  // create tentacles
  t = new Tentacle[maxtentacles];
  for(int i = 0; i < maxtentacles; i++) {
    createNewTentacle( i );
  }
  
}

void draw() {
  noStroke();
  // fade background every 5 frames
  if(framecounter%5==0) {
    fill(0,15);
    rect(0,0,width,height);
  }
  framecounter++;

  // move tentacles
  target = new Vector();
  float z = 2*PI * (framecounter%100) / 100;
  float x = width/2 + sin(z) * width/3;
  float y = height/2;
  fill(255,0,0,100);
  ellipse(x,y,5,5);
  target.init(x,y);

  for(int i = 0; i < t.length; i++) {
    t[i].move( target );
  }
}

void createNewTentacle( int id ) {
  int _point = int(random(0,startpoints.length));
  if (_point > startpoints.length -1 ) {
      _point = startpoints.length - 1;
  }
  t[id] = new Tentacle(   startpoints[_point][0] + int( random(-20,20) ), startpoints[_point][1] + int( random(-20,20) ));
  t[id].initialize( id, color(255,100), int(life + random(life)), false);
}

void mousePressed() { 
  noLoop();
} 

void mouseReleased() {
  loop();
}