buttons Buttons= new buttons();

class button {
  int x=0, y=0; String name = "valeur"; float V=1.234, Vmin=-10, Vdefault = 0, Vmax=10, Vincrement=0.1, VfastIncrement=1; 
  int d=18, i=4;
  button() {};
  button(String _name, float _Vmin, float _Vdefault, float _Vmax, float _Vincrement, float _VfastIncrement) {
         name=_name; Vmin=_Vmin; Vdefault= _Vdefault; Vmax= _Vmax; Vincrement= _Vincrement; VfastIncrement= _VfastIncrement; V=Vdefault; };
  void putAt(int _x, int _y) {x=_x; y=_y;};
  float v() {return(V);}
  void show() {
     stroke(dgreen); fill(20, 60, 120); rect(x+i,y,d,d); rect(x+i+d+i,y,d,d); rect(x+i+2*(d+i),y,d,d); rect(x+i+3*(d+i),y,d,d); rect(x+i+4*(d+i),y,d,d);
     fill(black); noStroke(); text(" |<  -  .  +  >| "+Format(V,4,4)+" = "+name,x,y+14); noFill();
    };
  boolean click() {
    if ( (x+i<mouseX)&&(mouseX<x+5*(d+i)) && (y<mouseY)&&(mouseY<y+d) ) {
      if ( (x+i<mouseX) && (mouseX<x+i+d) ) V=max(Vmin,V-VfastIncrement);
      if ( (x+i+d+i<mouseX) && (mouseX<x+i+d+d+i) ) V=max(Vmin,V-Vincrement);
      if ( (x+i+2*(d+i)<mouseX) && (mouseX<x+i+d+2*(d+i)) ) V=Vdefault;
      if ( (x+i+3*(d+i)<mouseX) && (mouseX<x+i+d+3*(d+i)) ) V=min(Vmax,V+Vincrement);
      if ( (x+i+4*(d+i)<mouseX) && (mouseX<x+i+d+4*(d+i)) ) V=min(Vmax,V+VfastIncrement);
      return(true);
      };
    return(false); 
    } 
  }

class buttons {
  int d=18, i=4;
  button [] B = new button [30];
  int nb = 0;
  buttons () {};
  void add(button b){B[nb]=b; B[nb].putAt(width-300,nb*(d+i)); nb++;};
  void setButtonTo(int i, button b) { B[i]=b; B[i].putAt(width-300,i*(d+i));};
  void reset(){ nb=0;};
  void show() { fill(60, 60, 120); noStroke(); rect(width-300,0,300,height); for (int i=0; i<nb; i++) B[i].show(); }
  float v (int i) {return(B[i].v());}
  void setValue(int i, float v) {B[i].V=v;};
  int click () {int k=-1; for (int i=0; i<nb; i++) if (B[i].click()) {k=i; println(i+": "+B[k].name+" = "+this.v(k)); }; return(k); }
  }

toggles Toggles= new toggles();

class toggles {
  int d=18, i=4;
  toggle [] B = new toggle [30];
  int nb = 0;
  toggles () {};
  void add(toggle b){B[nb]=b; B[nb].putAt(width-300,height-(nb+1)*(d+i)); nb++;};
  void setToggleTo(int i, toggle b) { B[i]=b; B[i].putAt(width-300,height-(i+1)*(d+i));};
  void reset(){ nb=0;};
  void show() { noStroke(); for (int i=0; i<nb; i++) B[i].show(); }
  boolean v (int i) {return(B[i].v());}
  void setValue(int i, boolean v) {B[i].V=v;};
  int click () {int k=-1; for (int i=0; i<nb; i++) if (B[i].click()) {k=i; println(i+": "+B[k].name+" = "+this.v(k)); }; return(k); }
  }
  
class toggle {
  int x=0, y=0; String name = "valeur"; boolean V=false; 
  int d=18, w=200, i=4;
  toggle() {};
  toggle(String _name, boolean _V) {name=_name; V=_V; };
  void putAt(int _x, int _y) {x=_x; y=_y;};
  boolean v() {return(V);}
  void show() {stroke(dgreen); if(V) fill(40,60,120); else fill(10,60,120); rect(x+i,y,w,d); 
     fill(black); noStroke(); text(name,x+5,y+14); noFill(); };
  boolean click() {if ( (x+i<mouseX)&&(mouseX<x+i+w) && (y<mouseY)&&(mouseY<y+d) ) {V=!V; return(true); }; return(false); } 
  }

  String  Format(int v, int n) {String s=str(v); String spaces = "                               ";
   int L = max(0,n-s.length());
   String front = spaces.substring(0, L);
   return(front+s);
  };

String  Format(String s, int n) {String spaces = "                                 ";
    int L = max(0,n-s.length());
    String back = spaces.substring(0, L);
    return(s+back);
  };

String  Format(float f, int n, int z) {
   String sign = "-"; if (f>=0) sign="+";
   String spaces = "                                ";
   String s=nf(abs(f),n,z); 
   while (s.indexOf("0")==0) {s=s.substring(1,s.length());};
   int b=s.indexOf("."); int a=max(0,n-b); int c=s.length()-b-1;  int d=0;
   if (c>z) {s=s.substring(0,b+1+z); c=z;} else { d=z-c;};
   String front = spaces.substring(0, a);
   String back = spaces.substring(0, d);
   return(front+sign+s+back);
  };

void loadButtons() {                          // define buttons that control numeric values here
   Buttons.add(new button("recursions",0,rec,7,1,7));         // defines Label and values (min, current, max, increment, fast increment)
   Buttons.add(new button("button 2",0,3,7,1,7));        // replace this with your button and add more if  desired
   Buttons.add(new button("button 3",0,3,7,1,7));        // replace this with your button and add more if  desired
   }
   
void loadToggles() {                         // define toggles that control boolean values here
   Toggles.add(new toggle(" ",true));         // toggle 0 (bottom)
   Toggles.add(new toggle(" ",true));         // toggle 0 (bottom)
   Toggles.add(new toggle(" ",true));         // toggle 0 (bottom)
   Toggles.add(new toggle(" ",true));         // toggle 0 (bottom)
   Toggles.add(new toggle(" ",true));         // toggle 0 (bottom)
   Toggles.add(new toggle(" ",true));         // toggle 0 (bottom)
   Toggles.add(new toggle(" ",true));         // toggle 0 (bottom)
   Toggles.add(new toggle(" ",true));         // toggle 0 (bottom)
   Toggles.add(new toggle(" ",true));         // toggle 0 (bottom)
   Toggles.add(new toggle(" ",true));         // toggle 0 (bottom)
   Toggles.add(new toggle(" ",true));         // toggle 0 (bottom)
   Toggles.add(new toggle(" ",true));         // toggle 0 (bottom)
   Toggles.add(new toggle(" ",true));         // toggle 0 (bottom)
   Toggles.add(new toggle("Show Frame",showFrame));         // toggle 1 (bottom)
   Toggles.add(new toggle("Show Ghosts",showGhostFrame));   // toggle 2
   Toggles.add(new toggle("Reset",false));                  // toggle 3
   Toggles.add(new toggle("Animate",animate));         // toggle 1 (bottom)
   Toggles.add(new toggle("Show subdivision",showSubdivision));         // toggle 1 (bottom)
   Toggles.add(new toggle("Show curve",showCurve));         // toggle 1 (bottom)
   Toggles.add(new toggle("Show construction",showConstruction));         // toggle 1 (bottom)
    }

void mousePressed() {
  int k= Buttons.click();  int m=-1;         // bind value-buttons to actions here (same order as definition above)
  if(k== ++m) {rec=int(Buttons.v(m));};      // actions for button 1
  if(k== ++m) { };                           //  actions for button 2
  if(k== ++m) ;

 // Can reset the value of any button with Buttons.setValue(button,value);
 
 
  k= Toggles.click();   m=-1; // bind boolean-toggles to actions here (same order as definition above)
  m=12;
  if(k==++m) showFrame=Toggles.v(m);       // actions for toggle 1
  if(k==++m) showGhostFrame=Toggles.v(m);       // actions for toggle 2
  if(k==++m) {Toggles.B[m].V=false; reset(); };    // actions for toggle 3 always resets it to false
  if(k==++m) {animate=Toggles.v(m); if(animate) tt=acos(t*2-1); else t=(cos(tt)+1)/2;}      // toggles animation and resets time
  if(k==++m) showSubdivision=Toggles.v(m);       // actions for toggle 2
  if(k==++m) showCurve=Toggles.v(m);       // actions for toggle 2
  if(k==++m) showConstruction=Toggles.v(m);       // actions for toggle 2

// ***** pick: find index p of point closest to the mouse when clicked

  if (mouse().isInWindow()) {
     if (!keyPressed) {
        p=0; 
        float d=PP[0].disToMouse(); 
        for (int i=1; i<PP.length; i++) if (PP[i].disToMouse()<d) {d=PP[i].disToMouse(); p=i;} 
         }
     else {
          if (key=='?') printIt=true; // to print something once
          if (key=='d') ;
          }  
     }  
  } 
  
void mouseReleased() {    };                                    // do this when mouse released
  
void keyPressed() {  
  if (key==' ') showHelpText=!showHelpText ;   if (key=='M') showMenu=!showMenu;
  if (key=='X') {String S=" "+"-####.tif"; saveFrame(S);};   ;
  if (key=='-') rec--;   if (key=='+') rec++;
  if (key=='?') printIt=true;  // toggle debug mode
   };     
 
void keyReleased() {};