​

class Bullet {

  constructor({x = 0, y = 0, x_vel = 0, y_vel = 0}={}) {

    this.x = x;

    this.y = y;

    this.x_vel = x_vel;

    this.y_vel = y_vel;

    this.flag_destroy = false;

  }

  update() {

    this.x += this.x_vel;

    this.y += this.y_vel;

    if (this.x < -width/2-64 || this.x > width/2+64 || 

        this.y < -height/2-64 || this.y > height/2+64) {

      this.flag_destroy = true;

    }

  }

  show() {

    noStroke()

    fill([0, 0, 0])

    circle(this.x, this.y, 5);

    //fill([255, 0, 0])

    //circle(this.x, this.y, 24);

    //fill([255, 255, 255])

    //circle(this.x, this.y, 16);

  }

}

​

let bullets = [];

​

let shaderTest;

function preload() {

  shaderTest = loadShader("shaders/metaball.vert","shaders/metaball.frag");

}

​

function setup() {

  createCanvas(512, 480, WEBGL);

  noStroke();

  for (let i = 0; i < 10; i++) {

    bullets.push(new Bullet({

      x : random(width), y : random(height),

      x_vel : random(-2, 2), y_vel : random(-2, 2)

    }))

  }

}

​

let func_randomBulletCircle = (_posX, _posY) => {

  if (bullets.length < 1000) {

    let amount = floor(random(8, 16))

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

      let d = (2 * 3.141) * (i / amount);

      let xa = sin(d);

      let ya = cos(d);

​

      bullets.push(new Bullet({

          x : _posX, y : _posY,

          x_vel : xa, y_vel : ya

        }))

​

    }

  }

}

​

function mousePressed() {

  func_randomBulletCircle(mouseX - width/2, mouseY - height/2)

}

​

function draw() {

​

  if (!keyIsDown(32)) {

    if (random(1) < 0.02) {

      func_randomBulletCircle(random(-width/2, width/2), random(-height/2, height/2))

    }

    for (let b of bullets) {

      b.update()

      //b.show()

    }

  }

  for (let i = 0; i < bullets.length; i++) {

    let b = bullets[i]

    if (b.flag_destroy) {

      bullets.splice(i, 1)

      i--

    }

  }

  let ballPositions = []

  for (let b of bullets) {

    ballPositions.push((b.x/width)+0.5)

    ballPositions.push((b.y/height)+0.5)

  }

  while (ballPositions.length/2 < MAXIMUMBULLETS) {

    ballPositions.push(-69, -69)

  }

  shader(shaderTest);

  shaderTest.setUniform("iResolution", [width,height]);

  shaderTest.setUniform("iTime", second());

  shaderTest.setUniform("balls", ballPositions);

​

  rect(0,0,width,height);

  resetShader()

}