/**
 * Begijnhofpark: 
 * klik en schuif met de cursor de verschillende balmotieven doorheen het beeldvlak.</p><p> <a href="http://www.kortrijksetaferelen.net">Keer terug</a>
*/

PImage img;
 

int num = 7; 
Spring[] springs = new Spring[num]; 

void setup()
{
  size(1014,674);
  noStroke(); 
  smooth();
  springs[0] = new Spring(280, 580, 130, 0.98, 8.0, 1.0, springs,0); 
  springs[1] = new Spring(480, 550, 85, 0.95, 9.0, 1.0, springs,1); 
  springs[2] = new Spring(94, 568, 43, 0.90, 9.9, 0.9, springs,2);  
  springs[3] = new Spring(590, 560, 48, 0.95, 9.0, 0.9, springs,3);
  springs[4] = new Spring(400, 600, 43, 0.95, 9.0, 0.9, springs,4);
  springs[5] = new Spring(540, 620, 60, 0.95, 9.0, 0.9, springs,5); 
  springs[6] = new Spring(655, 600, 50, 0.95, 9.0, 0.9, springs,6); 
 
frameRate(30);

}
void draw() 
{
   background(0);
   
   tint(255,255);
   
   img = loadImage( "balpark3.jpg" );
   image(img,0,0);
   
   fill(0,102,102);
   stroke(255,51,51);
   ellipse(280,580,130,130);
   stroke(255,51,51);
   ellipse(280,580,126,126);
   
   fill(51,51,153);
   stroke(204,51,204);
   ellipse(480,550,85,85);
   stroke(204,51,204);
   ellipse(480,550,81,81);
   
   fill(153,153,255);
   stroke(0,51,102);
   ellipse(590,560,48,48);
   stroke(0,51,102);
   ellipse(590,560,44,44);
  
   fill(0,102,153);
   stroke(51,51,102);
   ellipse(400,600,43,43);
   stroke(51,51,102);
   ellipse(400,600,39,39);
   
   fill(102,204,204);
   stroke(0,102,153);
   ellipse(540,620,60,60);
   stroke(0,102,153);
   ellipse(540,620,54,54);
   
   fill(0,153,102);
   stroke(102,51,204);
   ellipse(655,600,50,50);
   stroke(102,51,204);
   ellipse(655,600,46,46);
  
 
  
  for (int i = 0; i < num; i++) { 
    springs[i].update(); 
    springs[i].display(); 
  }  
}

void mousePressed() 
{
  for (int i = 0; i < num; i++) { 
    springs[i].pressed(); 
  } 
}

void mouseReleased() 
{
  for (int i=0; i<num; i++) { 
    springs[i].released(); 
  } 
}

class Spring 
{ 
   
  float xpos, ypos;
  float tempxpos, tempypos; 
  int size = 20; 
  boolean over = false; 
  boolean move = false; 

  
  float mass;       
  float k = 0.2;     
  float damp;       
  float rest_posx;  
  float rest_posy;  

  
  
  float velx = 0.0;   
  float vely = 0.0;   
  float accel = 0;    
  float force = 0;    

  Spring[] friends;
  int me;
  
  // Constructor
  Spring(float x, float y, int s, float d, float m, 
         float k_in, Spring[] others, int id) 
  { 
    xpos = tempxpos = x; 
    ypos = tempypos = y;
    rest_posx = x;
    rest_posy = y;
    size = s;
    damp = d; 
    mass = m; 
    k = k_in;
    friends = others;
    me = id; 
  } 

  void update() 
  { 
    if (move) { 
      rest_posy = mouseY; 
      rest_posx = mouseX;
    } 

    force = -k * (tempypos - rest_posy);  
    accel = force / mass;                 
    vely = damp * (vely + accel);         
    tempypos = tempypos + vely;           

    force = -k * (tempxpos - rest_posx);  
    accel = force / mass;                 
    velx = damp * (velx + accel);         
    tempxpos = tempxpos + velx;           

    
    if ((over() || move) && !otherOver() ) { 
      over = true; 
    } else { 
      over = false; 
    } 
  } 
  
  
  boolean over() {
    float disX = tempxpos - mouseX;
    float disY = tempypos - mouseY;
    if (sqrt(sq(disX) + sq(disY)) < size/2 ) {
      return true;
    } else {
      return false;
    }
  }
  
 
  boolean otherOver() {
    for (int i=0; i<num; i++) {
      if (i != me) {
        if (friends[i].over == true) {
          return true;
        }
      }
    }
    return false;
  }

  void display() 
  { 
    if (over) { 
      stroke(0,51,102);
      fill(0,204,204);
     
    } else { 
      stroke(255,153,0);
      fill(0,51,102);
      
     } 
    ellipse(tempxpos, tempypos, size, size);
  } 

  void pressed() 
  { 
    if (over) { 
      move = true; 
    } else { 
      move = false; 
    }  
  } 

  void released() 
  { 
    move = false; 
    rest_posx = xpos;
    rest_posy = ypos;
  } 
}