float forceStep = 0.01;
float gravity = 0.0;
SliderV xSlid;
SliderH ySlid;
Button scene1, scene2, scene3, scene0, scene4;
PhysicsObject objects;
PFont font;

//-----------------------
void setup(){

  size(400,400,P3D);
  framerate(30);
  sphereDetail(8);
  font = loadFont("sansserif-9.vlw");
  xSlid = new SliderV(10,10,10,height-20,-HALF_PI,HALF_PI, 0);
  ySlid = new SliderH(30,height-20,width-90,10,-PI,PI, 0);
  scene0 = new Button(width-50,width-25,40,15,font,"scene 0");
  scene1 = new Button(width-50,width-50,40,15,font,"scene 1");
  scene2 = new Button(width-50,width-75,40,15,font,"scene 2");
  scene3 = new Button(width-50,width-100,40,15,font,"scene 3");
  scene4 = new Button(width-50,width-125,40,15,font,"scene 4");
  scene0.setStateCount(2);
  scene1.setStateCount(2);
  scene2.setStateCount(2);
  scene3.setStateCount(2);
  scene4.setStateCount(2);
  color q = color(0), w = color(255,128), e = color(128);
  color a = color(128,128), s = color(0);
  scene0.makeState(0, "scene0", null, q, w, e);
  scene1.makeState(0, "scene1", null, q, w, e);
  scene2.makeState(0, "scene2", null, q, w, e);
  scene3.makeState(0, "scene3", null, q, w, e);
  scene4.makeState(0, "scene4", null, q, w, e);
  scene0.makeState(1, "scene0", null, q, a, s);
  scene1.makeState(1, "scene1", null, q, a, s);
  scene2.makeState(1, "scene2", null, q, a, s);
  scene3.makeState(1, "scene3", null, q, a, s);
  scene4.makeState(1, "scene4", null, q, a, s);

  scene0();
}
//-----------------------
void scene0(){
  objects = new Ball(30f,0f,30f,0f);
  objects.add( new Ball(30f,0f,-30f,0f));
  objects.add( new Ball(30f,0f,-90f,0f));
  objects.add( new Ball(30f,0f,-150f,0f));
  objects.add( new Ball(30f,0f,-210f,0f));

  objects.add( new Ball(60f,80f,-60f,80f));
  objects.add( new Ball(20f,50f,-350f,50f));
  objects.add( new Surface(60f) );
  objects.add( new Gravity(0.1) );
}
//-----------------------
void draw(){
  background(255);
  lights();

  pushMatrix();
  translate(width/2,height/2,0);
  rotateX(-xSlid.value);
  rotateY(ySlid.value);
  objects.simulate();
  objects.update();
  objects.visualize();
  popMatrix();

  if(mousePressed){
    xSlid.mouseInput(mouseX,mouseY);
    ySlid.mouseInput(mouseX,mouseY);
  }

  xSlid.visualize();
  ySlid.visualize();
  scene0.visualize();
  scene1.visualize();
  scene2.visualize();
  scene3.visualize();
  scene4.visualize();
}
//------------------------------------------------
void mouseReleased() {
  xSlid.mouseInput(mouseX,mouseY);
  ySlid.mouseInput(mouseX,mouseY);
  if(scene0.mouseInput(mouseX,mouseY)){
    scene0();
    scene1.setState(0);
    scene2.setState(0);
    scene3.setState(0);
    scene4.setState(0);
  }
  if(scene1.mouseInput(mouseX,mouseY)){
    objects = new Cloth(200f,10,-50f,-60f,-50f);
    objects.add( new Ball(50f,0f,4f,0f) );
    objects.add( new Ball(30f,-30f,-1000f,-40f) );
    objects.add( new Ball(40f,-60f,-600f,-80f) );
    objects.add( new Surface(50f) );
    objects.add( new Gravity(0.1) );
    objects.add( new Friction(0.96) );
    scene0.setState(0);
    scene2.setState(0);
    scene3.setState(0);
    scene4.setState(0);
  }
  if(scene2.mouseInput(mouseX,mouseY)){
    objects = new Cloth(150f,15,-75f,-60f,-50f);
    objects.add( new Ball(50f,0f,4f,0f) );
    objects.add( new Ball(30f,10f,-2000f,30f) );
    objects.add( new Ball(40f,-20f,-600f,-20f) );
    objects.add( new Surface(50f) );
    objects.add( new Gravity(0.1) );
    objects.add( new Friction(0.96) );
    scene1.setState(0);
    scene0.setState(0);
    scene3.setState(0);
    scene4.setState(0);
  }
  if(scene3.mouseInput(mouseX,mouseY)){
    objects = new Cloth(300f,20,-150f,-110f,-150f);
    objects.add( new Ball(50f,50f,-40f,50f) );
    objects.add( new Ball(50f,50f,-40f,-50f) );
    objects.add( new Ball(50f,-50f,-40f,50f) );
    objects.add( new Ball(50f,-50f,-40f,-50f) );
    objects.add( new Ball(100f,0f,-2000f,0f) );
    objects.add( new Surface(50f) );
    objects.add( new Gravity(0.1) );
    objects.add( new Friction(0.95) );
    scene1.setState(0);
    scene2.setState(0);
    scene0.setState(0);
    scene4.setState(0);
  }
  if(scene4.mouseInput(mouseX,mouseY)){
    objects = new Cloth(200f,15,-100f,-100f,-100f);
    objects.add( new Ball(50f,0f,0f,0f) );
    objects.add( new Surface(45f) );
    objects.add( new Gravity(0.5) );
    objects.add( new Friction(0.98) );
    scene1.setState(0);
    scene2.setState(0);
    scene3.setState(0);
    scene0.setState(0);
  }
}
//-----------------------