/*
cut'n'pasting from traer examples...

wwww.pixelorchestra.com

*/

import traer.physics.*;

ParticleSystem physics;
Particle[] particles;
Particle mouse;

int attoCount=0;
void setup()
{
PFont fontA = loadFont("bodoni.vlw");
textFont(fontA, 14);
textAlign(CENTER);
   

  size( 400, 400 );
  smooth();
  fill( 255 );
  stroke(255);
  frameRate( 24 );
  ellipseMode( CENTER );
        
      
  physics = new ParticleSystem( 0.0, 0.15 );
  
  particles = new Particle[10];

  

  particles[0] = physics.makeParticle( 5.0, width/2, height/2, 0 );
  //particles[0].makeFixed(); 
  
  for ( int i = 1; i < particles.length; ++i )
  {
    particles[i] = physics.makeParticle( 1.0, width/2, height/2+i, 0 );
    physics.makeSpring( particles[i-1],  particles[i], 4.0, .1, 1.01 );
  }
  
  particles[particles.length-1].setMass( 1.0 );
  
  mouse = physics.makeParticle( 5.0, width/2, height/2, 0);
mouse.makeFixed();
 physics.makeAttraction( mouse,  particles[0], 10000, 10 );
 // physics.makeAttraction( mouse, particles[particles.length-1], 10000, 10 );
  physics.makeAttraction( particles[0],particles[particles.length-1], -10000, 5 );


  
  
}

void draw()
{
    background( 63,151,181 );
  
  physics.advanceTime( .51 );

 if(frameCount<500) text("preludio",width/2, height/2-180);

if((frameCount)%500==0){
  attoCount++;

mouse.moveTo( random(0,500), random(0,500), 0 );

}
  
 if(frameCount>500)  text(attoCount+"¡ "+"atto",width/2, height/2-180);
  
  
  
      fill( 255);
  ellipse( mouse.position().x(), mouse.position().y(), 8, 8 );

    /*
  if ( mousePressed )
  {
    particles[particles.length-1].moveTo( mouseX, mouseY, 0 );
   // particles[particles.length-1].velocity().clear();
  }
    */

  
  beginShape( );
  noFill();
  
  curveVertex( particles[0].position().x(), particles[0].position().y() );
  for ( int i = 0; i < particles.length; ++i )
  {
    curveVertex( particles[i].position().x(), particles[i].position().y() );
  }
  curveVertex( particles[particles.length-1].position().x(), particles[particles.length-1].position().y() );
  endShape();
  fill(255);
  ellipse( particles[0].position().x(), particles[0].position().y(), 2, 2 );
  //ellipse( particles[particles.length-1].position().x(), particles[particles.length-1].position().y(), 1, 1 );
  
  handleBoundaryCollisions( particles[0] );
  handleBoundaryCollisions( particles[particles.length-1] );

}
/*
void mouseReleased()
{
  particles[particles.length-1].setVelocity( (mouseX - pmouseX), (mouseY - pmouseY), 0 );
}
*/

void handleBoundaryCollisions( Particle p )
{
  if ( p.position().x() < 0 || p.position().x() > width )
    p.setVelocity( -0.9*p.velocity().x(), p.velocity().y(), 0 );
  if ( p.position().y() < 0 || p.position().y() > height )
    p.setVelocity( p.velocity().x(), -0.9*p.velocity().y(), 0 );
  p.moveTo( constrain( p.position().x(), 0, width ), constrain( p.position().y(), 0, height ), 0 ); 
}