import processing.opengl.*;
import anar.*;





/*
 * Example for Anar library by Guillaume LaBelle + Julien Nembrini
 * http://anar.ch
 */


Obj myObj;

Param a, b, c, h, w;


void setup(){
    size(800,400,OPENGL);
  Anar.init(this);
  Anar.drawAxis();

  a = new Param(10,0,40,"a");
  b = new Param(28,0,100,"b");
  c = new Param(8/3f,0,10,"c");
  h = new Param(0.02f,0,0.1f,"h");
  w = new Param(0.5f,0,1,"w");

  Anar.sliders(a);
  Anar.sliders(b);
  Anar.sliders(c);
  Anar.sliders(h);
  Anar.sliders(w);

  initForm();
}


void initForm(){
  myObj = new Obj();
  Pts curveCtrl = new Pts();

  // Create a first point
  Pt base = Anar.Pt(0.1f,0,0);
  curveCtrl.add(base);

  // This equation is not not linear, we have to calculate every points
  for (int i = 0; i<1000; i++){
    float x1 = base.x()+h.get()*a.get()* (base.y()-base.x());
    float y1 = base.y()+h.get()* (base.x()* (b.get()-base.z())-base.y());
    float z1 = base.z()+h.get()* (base.x()*base.y()-c.get()*base.z());

    base = Anar.Pt(x1,y1,z1);
    curveCtrl.add(base);
  }

  // Create a curve based on all the points
  CSpline curve = new CSpline(curveCtrl);
  myObj.add(curve);
  Anar.camTarget(myObj);

  // Snap a point on the Curve
  Pt ptOnCurve = new PtCurve(curve,w);
  myObj.add(ptOnCurve);
}


void draw(){
  background(155);
  myObj.draw();
}


void keyPressed(){
  if(key==' ')
    initForm();
}