https://krishanrana.github.io/js/Particles.js

1class Particles {
2
3  constructor(x,y){
4    this.loc = createVector(x,y);
5    this.vel = createVector(random(-0.1,0.1), random(-0.1,0.1));
6    this.offsetX = random(0,500);
7    this.offsetY = random(0,500);
8  }
9  
10  show(){
11    fill(255);
12    circle(this.loc.x, this.loc.y, 10);
13  }
14  
15  update(){
16    
17    //check that it is in bounds
18    if (this.loc.x < 0 || this.loc.x > width) {
19      this.vel.x = -this.vel.x;
20    }
21    //check that it is in bounds
22    if (this.loc.y < 0 || this.loc.y > height) {
23      this.vel.y = -this.vel.y;
24    }
25    this.loc.add(this.vel);
26  }
27}
28