picturelements.github.io/anvakaGraph.html at master · PicturElements/picturelements.github.io · GitHub

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<!DOCTYPE html>
<meta name="robots" content="noindex">
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <link rel="icon" href="pelement.png">
  <meta name="description" content="HSL pixel separator graph maker - original by anvaka">
  <meta name=author content="Andrei Kashcha">
  <title>Gaussian Distribution</title>
  <style>
    body {
      display: flex;
      margin: 0;
      flex-direction: column;
      height: 100vh;
      font-family: monospace;
    }

    #content {
      display: flex;
      align-items: center;
      justify-content: center;
      flex-grow: 1;
      background: #222;
    }

    #controls {
      padding: 10px;
      border-top: 1px dashed #555;
      background: #333;
      color: #eee;
    }

    .question {
      color: #aaa;
      cursor: help;
    }

    input {
      background: #222;
      border: 1px solid #555;
      padding: 5px 10px;
      color: white;
      font: inherit;
      outline: none;
    }

    input:first-of-type {
      width: 50%;
    }

    button {
      background: #222;
      border: 1px solid #555;
      padding: 5px 10px;
      font: inherit;
      color: white;
      cursor: pointer;
      outline: none;
    }

    input:focus, button:focus {
      border-color: #888;
    }

    #credit {
      float: right;
      line-height: 25px;
      margin-right: 10px;
    }

    a {
      color: #8a8aff;
      text-decoration: none;
      font-weight: bold;
      font-size: 120%;
      vertical-align: bottom;
    }
  </style>
</head>
<body>
<div id="content">
  <canvas id="canv"></canvas>
</div>
<div id="controls">
  <input id="src-inp" spellcheck="false" placeholder="image URL">
  <button onclick="requestStart()">Play</button>
  | max size <span class="question" title="OPTIONAL. Sets the maximum size (width or height) of the image. If the input image is bigger in any direction it will be resized to specification, making the animation run smoother on the smaller data set. Leave blank or 0 for full size.">(?)</span>:
  <input id="max-size" placeholder="max size (optional)" value="500">
  <span id="credit" style="float: right">Original code by <a href="https://github.com/anvaka" target="_blank" rel="noopener noreferrer">anvaka</a></span>
</div>

<script src="https://cdnjs.cloudflare.com/ajax/libs/chroma-js/1.3.5/chroma.min.js"></script>
<script id="jsbin-javascript">
  var colorSet = new Map(); // maps color value to pixel info
  var img = document.createElement('img');
  var canvas = document.getElementById('canv');
  var ctx;
  // I use state to determine whether it should expand or collapse
  var currentStage = 1;
  // This is to properly scale the height of the chart
  var maxColorsInBin = 0;
  // Width and height of the working image
  var width, height;

  // Meta info, max size data
  var running = false,
      requestFlow = 0,  //0: do nothing, 1: restart, 2: break
      maxSize = null;

  // Make sure image has CORS setup, otherwise we will not have access
  // to it
  img.crossOrigin = 'Anonymous';

  function start() {
    width = img.width;
    height = img.height;
    var maxS=Math.max(width,height);
    if (maxSize !== null && maxS > maxSize){
      var scale=maxSize/maxS;
      width = Math.round(width*scale);
      height = Math.round(height*scale);
    }

    canvas.width = width;
    canvas.height = height;

    ctx = canvas.getContext('2d');
    ctx.drawImage(img, 0, 0, width, height);
    var imgData = ctx.getImageData(0, 0, width, height);
    var pixels = imgData.data;
    // We are going to collect pixel values first
    for (var x = 0; x < width; ++x) {
      for (var y = 0; y < height; ++y) {
        var i = (x + y * width) * 4;
        var r = pixels[i + 0];
        var g = pixels[i + 1];
        var b = pixels[i + 2];
        var a = pixels[i + 3];
        var color = chroma(r, g, b)
        var colorKey = color.get('hsl.l')
        var pixelInfo = colorSet.get(colorKey);
        if (!pixelInfo) {
          pixelInfo = {
            points: [],
          };
          colorSet.set(colorKey, pixelInfo);
        }
        pixelInfo.points.push({
          // original position of a pixel
          x: x,
          y: y,
          // Randomly assign animation lifespan
          timeSpan: Math.round(Math.random() * 120) + 30,
          // current frame number, used for interpolation
          frame: 0,
          // Where this pixel should go? Will be computed by computeDestinations()
          destX: 0,
          destY: 0,
          // Current color
          color: color
        });
        // We need to know the highest point of a chart, to properly scale it inside
        // available canvas
        if (pixelInfo.points.length > maxColorsInBin) maxColorsInBin = pixelInfo.points.length;
      }
    }
    // Now that we have all pixels collected, lets figure out.
    computeDestinations();
    // I did a small pause before initial animation, to set the stage

    setTimeout(() => {
      requestAnimationFrame(move);
    }, 1000);
  }
  function interploate(t) {
    // This is easeInOutQuad function. See more here https://gist.github.com/gre/1650294
    return t < 0.5 ? 2 * t * t : -1 + (4 - 2 * t) * t;
  }
  function lerp(a, b, t) {
    // simple linear interploation.
    return b * t + a * (1 - t);
  }
  // Main animation loop
  function move() {
    if (requestFlow > 0){
      if (requestFlow == 1)
        initAnvaka();
      requestFlow = 0;
      return;
    }

    // When all pixels cannot be moved anymore, we switch the mode.
    var hasMore = false;
    // Need to pick neutral background color to not blend with original colors
    ctx.fillStyle = '#676767';
    ctx.fillRect(0, 0, width, height);
    var imgData = ctx.getImageData(0, 0, width, height);
    var pixels = imgData.data;
    // Okay, let's move the pixels
    colorSet.forEach((pixelInfo, colorKey) => {
      pixelInfo.points.forEach((point) => {
        // given current frame, use easing to figure out offset of a pixel
        var t = interploate(point.frame/point.timeSpan);
        if (currentStage === 1 && point.frame < point.timeSpan) {
          point.frame += 1;
          // if at least one point was moved - keep trying on the next frame
          hasMore = true;
        }  else if (currentStage === 2 & point.frame > 0) {
          point.frame -= 1;
          hasMore = true;
          // I want to restore portrait faster than collapsing it:
          if (point.frame > 0) point.frame -= 1;
        }
        var x = Math.round(lerp(point.x, point.destX, t));
        var y = Math.round(lerp(point.y, point.destY, t));
        // Color has four components, thus multplying by 4
        var pixelIndex = (x + y * width) * 4;
        var color = point.color.rgba();
        pixels[pixelIndex + 0] = color[0];
        pixels[pixelIndex + 1] = color[1];
        pixels[pixelIndex + 2] = color[2];
        pixels[pixelIndex + 3] = color[3] * 255;
      });
    });
    // All pixels updated on this frame, lets draw them
    ctx.putImageData(imgData, 0, 0);

    if (!hasMore) {
      // 3 is just a trick. If current state can be only 1 or 2, then
      // assigning 3 - currentState guarantees that we flip only between
      // these two states.
      currentStage = 3 - currentStage;
      hasMore = true;
      // Start next loop after a little pause
      setTimeout(() => {
        requestAnimationFrame(move)
      }, 1000);
    } else {
      requestAnimationFrame(move);
    }
  }
  function computeDestinations() {
    // This function computes where the pixel should go, based on its value
    var binCount = 256;
    var binWidth = (width/binCount);
    colorSet.forEach((pixelInfo, colorKey) => {
      var pointBin = colorKey * binCount;
      var xOffset = pointBin * binWidth;
      var yOffset = 1/maxColorsInBin;
      pixelInfo.points.forEach((point, idx) => {
        point.destX = xOffset;
        // I add small coefficients to make a padding.
        point.destY = height * 0.85 - 0.80 * height * idx /maxColorsInBin;
      })
    });
  }

  function requestStart(){
    if (running)
      requestFlow = 1;
    else
      initAnvaka();
  }

  function initAnvaka(){
    //PE's stuff
    currentStage = 1;
    maxColorsInBin = 0;
    running = true;
    colorSet = new Map();
    maxSize = parseInt(document.getElementById("max-size").value) || null;

    // When image is loaded - run the code.
    img.onload =  start;
    img.onerror = function(){
      alert("There is something wrong with this image or URL.");
      document.getElementById("src-inp").select();
      running = false;
      requestFlow = 1;
    };

    // Trigger image load.
    img.src = document.getElementById("src-inp").value;
  }
</script>
</body>
</html>