firework

let num = 100; 

let vecLocation = []; 

let vecVelocity = []; 

​

function setup() {

createCanvas(windowWidth, windowHeight); 

frameRate(60); 

for (let i = 0; i < num; i++) {

vecLocation[i] = createVector(width / 2, height / 2);

vecVelocity[i] = createVector(random(-10, 10), random(-10, 10));

}

}

function draw() {

background(0);

noStroke(); 

fill(random(225),random(120),random(93),139);

  let diameter =random(45, 200);

  ellipse(random(width),random(height),diameter, diameter);

for (let i = 0; i < num; i++) {

vecLocation[i].add(vecVelocity[i]); 

ellipse(vecLocation[i].x, vecLocation[i].y, 20, 20); 

​

if (vecLocation[i].x < 0 || vecLocation[i].x > width) { 

vecVelocity[i].x = vecVelocity[i].x * -1; 

}

if (vecLocation[i].y < 0 || vecLocation[i].y > height) { 

vecVelocity[i].y = vecVelocity[i].y * -1; 

}

}

}

​