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  1. class Ball {
  2.   PVector pos;
  3.   PVector vel;
  4.   float r;
  5.   float d;
  6.   color col;
  7.   float mass;
  8.   boolean isDead = false;
  9.   ArrayList<Ball> others;
  10.  
  11.   Ball(float r, float x, float y, PVector vel, color col, ArrayList<Ball> others) {
  12.     this.r = r;
  13.     this.d = 2*r;
  14.     this.mass = 10*sqrt(r * r);//r*r//3.21
  15.     this.pos = new PVector(x, y);
  16.     this.vel = vel;
  17.     this.col = col;
  18.     this.others = others;
  19.   }
  20.   void move() {
  21.     vel.mult(reduction);
  22.     pos.add(vel);
  23.     vel.y += gravity;
  24.   }
  25.  
  26.   void bound() {
  27.     if (pos.y + r > height) {
  28.       vel.y = -vel.y;
  29.       pos.y = height - r;
  30.     }
  31.     if (pos.y - r < 0) {
  32.       vel.y = -vel.y;
  33.       pos.y = r;
  34.     }
  35.     if (pos.x + r > width) {
  36.       vel.x = -vel.x;
  37.       pos.x = width - r;
  38.     }
  39.     if (pos.x - r < 0) {
  40.       vel.x = -vel.x;
  41.       pos.x = r;
  42.     }
  43.   }
  44.   float x() {
  45.     return pos.x;
  46.   }
  47.   float y() {
  48.     return pos.y;
  49.   }
  50.   float d() {
  51.     return d;
  52.   }
  53.   float r() {
  54.     return r;
  55.   }
  56.   void display() {
  57.     noStroke();
  58.     fill(col);
  59.     ellipse(x(), y(), d(), d());
  60.   }
  61.   void accelaration(PVector delta, float force) {
  62.     PVector accel = new PVector(delta.x, delta.y);
  63.     accel.mult(force/mass);
  64.     vel.add(accel);
  65.   }
  66.   void deadSmaller(Ball other) {
  67.     if (this.d() < other.d()) {
  68.       this.dead();
  69.     } else if (other.d() < this.d()) {
  70.       other.dead();
  71.     }
  72.   }
  73.   void collide() {
  74.     for (Ball other : others) {
  75.       if (other.isDead())continue;
  76.       if (this == other)continue;
  77.  
  78.       PVector delta = new PVector(other.x()-x(), other.y()-y());
  79.       float rr = other.r() + r();
  80.  
  81.       if (delta.mag() < rr) {
  82.         float force = spring * (rr - delta.mag());
  83.         delta.normalize();
  84.         this.accelaration(delta, -force);
  85.         other.accelaration(delta, force);
  86.         deadSmaller(other);
  87.       }
  88.     }
  89.   }
  90.   void dead() {
  91.     isDead = true;
  92.   }
  93.   boolean isDead() {
  94.     return isDead;
  95.   }
  96.   boolean isAlive() {
  97.     return !isDead();
  98.   }
  99. }
  100.  
  101.  
  102.  
  103. int maxBall = 50;
  104. ArrayList<Ball> balls;
  105.  
  106. float spring = 100; 
  107. float reduction = 0.9991; 
  108. float gravity = 0.01; 
  109.  
  110. void setup() {
  111.   size(480, 640);
  112.   colorMode(HSB, 360, 100, 100, 100);
  113.   smooth();
  114.   frameRate(30);
  115.  
  116.   balls = new ArrayList<Ball>();
  117.   for (int i = 0; i < maxBall; i++) {
  118.     addBall();
  119.   }
  120. }
  121. void addBall() {
  122.   float r = random(8, 12);////2, 4
  123.   float x = random(r, width-r);
  124.   float y = random(r, height-r);
  125.   PVector vel = new PVector(1, 0);
  126.   vel.mult(random(5, 10));
  127.   vel.rotate(random(TWO_PI));
  128.   color c = color(random(360), 100, 100);
  129.   balls.add(new Ball(r, x, y, vel, c, balls));
  130. }
  131. void draw() {
  132.   background(0, 0, 100);
  133.  
  134.   //fill(0, 0, 100, 40);
  135.   //rect(0, 0, width, height);
  136.  
  137.   for (Ball ball : balls) {
  138.     ball.display();
  139.     ball.move();
  140.     ball.bound();
  141.     ball.collide();
  142.   }
  143.  
  144.   for (int i=balls.size()-1; i>=0; i--) {
  145.     if (balls.get(i).isDead()) {
  146.       balls.remove(i);
  147.     }
  148.   }
  149. }
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https://ideone.com/UzqyWD
language:
Text (text 6.10)
created:
2 years ago
visibility:
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