Perlin-Noise/index.html at main · cdLab996/Perlin-Noise · GitHub

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<!DOCTYPE html>
<html>

<head>
  <meta charset="utf-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
  <title>Perlin Noise</title>

  <!-- <script type="text/javascript" src="https://cdn.jsdelivr.net/npm/p5@0.5.14/lib/p5.min.js"></script> -->
  <script type="text/javascript" src="https://cdn.jsdelivr.net/npm/p5@latest/lib/p5.min.js"></script>
  <style type="text/css">
    * {
      margin: 0;
      padding: 0;
    }
  </style>
</head>

<body>
  <main></main>
  <script type="text/javascript">
    var type;
    var options = {
      Background: '#0a0a0a',
      Color1: '#ffffff',
      Color2: '#0799f2',
      Color3: '#45217c',
      Length: 10,
      Nums: 400,
      Size: 2,
      noiseScale: 800,
      ColorMode: 'Normal',
      Random: function () {
        var Length = random(1, 50);
        LengthControl.setValue(Length);

        var Nums = random(200, 1000);
        NumsControl.setValue(Nums);

        var noiseScale = random(200, 4000);
        noiseControl.setValue(noiseScale);

        var Size = random(1, 4);
        SizeControl.setValue(Size);

        var Cmode = random(['Normal', 'Linera Gradient', 'Splice']);
        ColorControl.setValue(Cmode);

        setup();
      },

      Save: function () {
        saveFrames("Perlin-Noise", "png", 1, 1);
      },
    }

    var particles = [];
    var maxLife;

    function setup() {
      console.log('Setup');
      backgroundColor = color(options.Background);
      createCanvas(windowWidth, windowHeight);
      background(options.Background);
      for (var i = 0; i < 2500; i++) {
        particles[i] = new Particle();
      }
    }

    function draw() {
      console.log('Draw');
      noStroke();
      smooth();

      maxLife = options.Length;
      for (var i = 1; i < options.Nums; i++) {
        var iterations = map(i, 0, options.Nums, 5, 1);
        var radius = options.Size;

        particles[i].move(iterations);
        particles[i].checkEdge();

        var alpha = 255;
        var particleColor;
        var fadeRatio;
        fadeRatio = min(particles[i].life * 5 / maxLife, 1);
        fadeRatio = min((maxLife - particles[i].life) * 5 / maxLife, fadeRatio);
        var lifeRatioGrayscale = min(255, (255 * particles[i].life / maxLife) + red(backgroundColor));
        if (options.ColorMode == 'Normal') {
          if (i % 3 == 0) particleColor = options.Color1;
          if (i % 3 == 1) particleColor = options.Color2;
          if (i % 3 == 2) particleColor = options.Color3;
        }

        if (options.ColorMode == 'Linera Gradient') {
          var percent1 = norm(particles[i].pos.x, 0, width / 2);
          var percent2 = norm(particles[i].pos.x, width / 2, width);
          from = color(options.Color1);
          middle = color(options.Color2);
          to = color(options.Color3);
          between1 = lerpColor(from, middle, percent1);
          between2 = lerpColor(middle, to, percent2);
          if (particles[i].pos.x > 0 && particles[i].pos.x < width / 2) {
            particleColor = between1;
          } else {
            particleColor = between2;
          }
        }

        if (options.ColorMode == 'Radial Gradient') {
          var distance = dist(particles[i].pos.x, particles[i].pos.y, width / 2, height / 2);
          var percent1 = norm(distance, 0, 400);
          var percent2 = norm(distance, 400, width / 2);
          from = color(options.Color1);
          middle = color(options.Color2);
          to = color(options.Color3);
          between1 = lerpColor(from, middle, percent1);
          between2 = lerpColor(middle, to, percent2);
          if (distance < 400) {
            particleColor = between1;
          } else {
            particleColor = between2;
          }
        }

        if (options.ColorMode == 'Splice') {
          if (particles[i].pos.x >= width / 3 && particles[i].pos.x <= width / 3 * 2) {
            if (i % 3 == 0) particleColor = options.Color1;
            if (i % 3 == 1) particleColor = options.Color2;
            if (i % 3 == 2) particleColor = options.Color3;
          } else if (particles[i].pos.x < width / 3) {
            if (i % 3 == 0) particleColor = 20;
            if (i % 3 == 1) particleColor = 100;
            if (i % 3 == 2) particleColor = 220;
          } else if (particles[i].pos.x > width / 3 * 2) {
            if (i % 3 == 0) particleColor = color(255 - red(options.Color1), 255 - green(options.Color1), 255 - blue(options.Color1));
            if (i % 3 == 1) particleColor = color(255 - red(options.Color2), 255 - green(options.Color2), 255 - blue(options.Color2));
            if (i % 3 == 2) particleColor = color(255 - red(options.Color3), 255 - green(options.Color3), 255 - blue(options.Color3));
          }
        }

        fill(red(particleColor), green(particleColor), blue(particleColor), alpha * fadeRatio);
        particles[i].display(radius);
      }
    }

    function Particle() {
      this.vel = createVector(0, 0);
      this.pos = createVector(random(-50, width + 50), random(-50, height + 50));
      this.life = random(0, maxLife);
      this.move = function (iterations) {
        if ((this.life -= 0.01666) < 0) this.respawn();
        while (iterations > 0) {
          var angle = noise(this.pos.x / options.noiseScale, this.pos.y / options.noiseScale) * TWO_PI * options.noiseScale;
          this.vel.x = cos(angle);
          this.vel.y = sin(angle);
          this.vel.mult(0.2);
          this.pos.add(this.vel);
          --iterations;
        }
      }

      this.checkEdge = function () {
        if (this.pos.x > width || this.pos.x < 0 || this.pos.y > height || this.pos.y < 0) {
          this.respawn();
        }
      }

      this.respawn = function () {
        this.pos.x = random(-50, width + 50);
        this.pos.y = random(-50, height + 50);
        this.life = maxLife;
      }

      this.display = function (r) {
        ellipse(this.pos.x, this.pos.y, r, r);
      }
    }

    function touchStarted() {
      background(options.Background);
      for (var i = 0; i < options.Nums; i++) {
        particles[i].respawn();
        particles[i].life = random(0, maxLife);
      }
    }
  </script>
</body>

</html>