//// Arrays of objects.


int nb=16;
Ball[] b=  new Ball[nb];         // Array of Ball objects.

Button b1,b2,b3,b0;
Paragraph p1;
String title= " Projet 4";
String help= "'r' key to reset, 'q to quit. \n 'w' to remove wall. /n click any ball to reset it.";
String news= help;
String author= "Dymon Harris";

float up, right, down, left;
float center;
float mright, mleft;
float surface;
float horizon;

boolean wall=true;

//// SETUP:  create arrays, initialize, ec.
void setup() {
  size( 800,700 );
  horizon=  height/4;
  right= width-100;
  left=  95;
  up=  165;
  down= height-130;
  center= left + (right-left) / 2;
  mleft= 410;
  mright= 340;
  
  // Create cue and 15 balls.
  b[0]=  new Ball( 0, 255, 255, 255 );
  b[0].x=  200;
  b[0].y=  200;
  for (int i=1; i<nb; i++) {
    b[i]=  new Ball( 0, 255, 255, 255 );
  }
  
 b1= new Button(); 
  b1.r=170;
  b1.g=200;
  b1.b=255;
  b1.name= "Reset";
  //
  /*b2= new Button();
  b2.r=170;
  b2.g=200;
  b2.b=255;
  b2.name= "Color"; */
  //
  b3= new Button(); 
  b3.r=170;
  b3.g=200;
  b3.b=255;
  b3.name="Wall";
  //
  b0= new Button(); 
  b0.r=170;
  b0.g=200;
  b0.b=255;
  b0.name="Quit";
  //
  p1= new Paragraph();
  p1.r=150;
  p1.g=200;
  p1.b=250;
  p1.name="Project 3 \n \n 'r' key to reset, 'q to quit. \n 'w' to remove wall.\n click any ball to reset it.";
  //
}

void reset() {
  b[0].x= left + (right-left) / 4;
  b[0].y= up + (down-up) / 2;
  b[0].dx=0; b[0].dy=0;

  mleft= 410;
  mright= 340;
  wall = true;


  //// Random positions on right half (& ran speeds).
  for (int i=1; i<nb; i++) {
    b[i].x= random( mleft+60, right-60);
    b[i].y= random(up+60, down-60);
    b[i].dx= random( -2, 2 );
    b[i].dy= random( -2, 2 );
  }

  
//  reset();
  
}
//// NEXT:  Draw ball, after moving and colliding.
void draw() {
  /* background( 100,150,250 ); */
  background ( 150,200,250 );
  rectMode(CENTER);
  table ( left, up, right, down );
  show();
  action();
  messages();
}

//// Table, buttons, etc.
void table( float left, float up, float right, float down ) {
  fill( 0,150,100 );
  strokeWeight(15);
  stroke( 200,200,200 );
  rect( 395,370,645,445 );
  stroke(0);
  strokeWeight(8);


  if (!wall) {
    float center= left + (right-left) / 2;    
    line( 0,0,0,0 );
  }
  
  if (wall) {
    float center= left + (right-left) / 2;    
     line( 395,575,395,165 );
  }
}

//// ACTION:  move, collide, etc.
void action() {
  for( int i=0; i<nb-1; i++) {
    for( int j=i+1; j<nb; j++) {    
      collide( b[i], b[j] );
    }
  }
  //// Move all balls.
  for( int i=0; i<nb; i++) {
    b[i].move();
  }
}
//// Elastic collisions -- swap dx,dy
void collide( Ball p, Ball q ) {
  if ( p.hit( q.x,q.y ) ) {
    float tmp; float r,g,b;
    tmp=p.dx;  p.dx=q.dx;  q.dx=tmp;      // Swap the velocities.
    tmp=p.dy;  p.dy=q.dy;  q.dy=tmp;
    p.move();  p.move();   p.move();
    q.move();  q.move();   q.move();
  }
  if ( p.hit( q.x,q.y ) ) {
    p.r= (p.r+128) % 256;
    q.r= (q.b+128) % 256;
  }
  //++++
}

//// Display 
void show() {
  for( int i=0; i<nb; i++) {
    b[i].show();
  }
   b1.show();
 /* b2.show(); */
  b3.show();
  b0.show();
  //
  p1.show();
}

//// ????
void messages() {
}


/* void mousePressed() {
  
   if ( hit( mouseX,mouseY,  b[1].x,  b[1].y, 30,30  ) ) {  reset(); }
}
*/

void keyPressed() {
  if (key == 'q') { exit(); }
  if (key == 'r') { reset(); }
  if (key == 'w') { mleft = left; mright = right; wall = false; }
}

void mousePressed() {
  
   if ( hit( mouseX, mouseY, b1.x, b1.y, 80, 40 ) ) {
      reset();
   }
   /* if ( hit( mouseX, mouseY, b2.x, b2.y, 80, 40 ) ) {
       r= int( random(0,255) ); 
       g= int( random(0,200) ); 
       b= int( random(0,230) );
   } */
  
  if ( hit( mouseX, mouseY, b3.x, b3.y, 80, 40 ) ) {
  { mleft = left; mright = right; wall = false; }
  }
  
  if ( hit( mouseX, mouseY, b0.x, b0.y, 80, 40 ) ) {
      exit();
   }
   
}
//////// CLASSES ////////
class Ball {
  float x,y, dx,dy;
  float r,g,b;
  int number;
  //// CONSTRUCTORS:
  Ball( int n ) {
    number=  n;
    randomize();
  }
  Ball( int n, float r, float g, float b ) {
    number=  n;
    this.r=  r;
    this.g=  g;
    this.b=  b;
    randomize();
  }
  Ball( int n, float x, float y ) {
    number=  n;
    randomize();
  }
  void randomize() {
    r=  random( 50, 255 );
    g=  random( 150, 255 );
    b=  random( 50, 255 );
    x=  random( width/2, width-100 );
    y=  random( horizon+0, height-50 );
    dx=  random( -2, 2 );
    dy=  random( -2, 2 );
  }
  
  void reset() {
    x=  random( width/2, width-100 );
    y=  random( horizon+0, height-50 );
    dx=  random( -2, 2 );
    dy=  random( -2, 2 );
  }
  
  //// METHODS ////
  void move() {
    x=  x+dx;
    y=  y+dy;
    if (x<mleft || x>right) {  dx *=  -1; }
    if (y<up || y>down) {  dy *=  -1; }
  }
  void show() {
    //+++++
    strokeWeight(1);
    fill(r,g,b);
    ellipse( x, y, 30, 30 );
  }
  
  boolean hit( float x, float y ) {
    if (  dist( x,y, this.x,this.y ) < 30 ) return true;
    else return false;
  }
}


class Button {
  float x,y,w,h;
  int r,g,b;
  String name="s";
  String s ;
  
  void show() {
    fill(r,g,b);
    strokeWeight(1);
    rect( x,y, 80,40 );
    fill(0);
    text( name, x-5,y );
    
    b1.x=150; b1.y=40; b1.w=100; b1.h=100; 
    /* b2.x=600; b2.y=40;  b2.w=100; b2.h=100; */
    b3.x=450; b3.y=40; b3.w=100; b3.h=100;
    b0.x=28;  b0.y=100;  b0.w=100; b0.h=100;
  }
}

class Paragraph {
  float x,y,w,h;
  int r,g,b;
  String name="s";
  String s ;
  
  void show() {
    fill(r,g,b);
    strokeWeight(0);
    rect( x,y, 0,0 );
    fill(0);
    text( name, x-5,y );
    p1.x=230; p1.y=20; p1.w=0; p1.h=0;
  }
}

boolean hit( float x1, float y1, float x2, float y2, float w, float h ) {
  boolean result;

  // +++++ RETURNS TRUE when ????
  if ( abs(x1-x2) < w && abs(y1-y2)<h ) {
    result=  true;
  } else {
    result=false;
  }
  return result;
}