Galaxy

ArrayList < Star > galaxy = new ArrayList < Star > ();

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float tick;

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int colourpick;

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void setup() {

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  fullScreen();

  background(0, 0, 0);

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  for (int i; i < 5000; i++) {

    galaxy.add(0, new Star());

  }

}

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void draw() {

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  fill(0, 50);

  rect(0, 0, width, height);

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  for (Star staryu: galaxy) {

    staryu.render();

  }

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  tick += 0.025;

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}

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class Star {

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  float xPos, yPos, size, dist, speed, ofAng;

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  Star() {

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    dist = random(width / 2);

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    ofAng = radians(random(360));

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    speed = dist / 100000;

    size = dist / 25 + random(-2, 2);

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  }

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  void render() {

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    noStroke();

    fill(241, 124, 224);

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    xPos = width / 2 + cos(ofAng) * dist;

    yPos = width / 2 + sin(ofAng) * dist;

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    ellipse(xPos + (width / 2 + cos(tick) * 50 - width / 2) / (dist / 50), sin(tick) * 100 + yPos + (width / 2 + sin(tick) * 50 - height / 2) / (dist / 50), size, size);

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    ofAng += speed;

  }

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}