Connected particles - OpenProcessing

sketch210983
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Particle[] ps;
void setup(){
  size(500, 500);
  ps = new Particle[49];
  /*for(int i=0; i<ps.length; i++){
    ps[i] = new Particle();
  }*/
  for(int i=0; i<7; i++){
     for(int j=0; j<7; j++){
        ps[i+7*j] = new Particle(i*70 + 45, j*70 + 45); 
     }
  }
  
}
​
void draw(){
  fill(255, 10);
  rect(0, 0, width, height);
  for(int i=0; i<ps.length; i++){
    ps[i].exist();
    ps[i].interact(ps);
    ps[i].constrainedMovement();
  }
}
​
class Particle {
  float x, y;
  float initX, initY;
  float velX, velY;
​
  Particle() {
    x = random(width);
    y = random(height);
    velX = (random(1)<0.5)?random(0, 1):random(-1, 0);
    velY = (random(1)<0.5)?random(0, 1):random(-1, 0);
  }
  
  Particle(float x_, float y_) {
    x = x_;
    y = y_;
    initX = x;
    initY = y;
    velX = (random(1)<0.5)?random(0, 1):random(-1, 0);
    velY = (random(1)<0.5)?random(0, 1):random(-1, 0);
  }
​
  void move() {
    x+= velX;
    y+=velY;
  }
​
  void display() {
    fill(200);
    noStroke();
    ellipse(x, y, 5, 5);
  }
​
  void edges() {
    if (x>width || x<0) velX*=-1;
    if (y>height || y<0) velY*=-1;
  }
​
  void interact(Particle[] ps) {
    stroke(150);
    for (int i=0; i<ps.length; i++) {
      if (this.x!=ps[i].x && this.y !=ps[i].y) {
        if (dist(this.x, this.y, ps[i].x, ps[i].y)<110) {
          line(this.x, this.y, ps[i].x, ps[i].y);
        }
      }
    }
  }
  
  void constrainedMovement(){
     if(abs(x-initX)>70) velX*=-1;
     if(abs(y-initY)>70) velY*=-1;
  }
​
  void exist() {
    move();
    display();
    edges();
  }
}