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Revisions

  1. Peter Beshai revised this gist Mar 17, 2017. 1 changed file with 1 addition and 1 deletion.
    2 changes: 1 addition & 1 deletion README.md
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    Using D3 and d3-transition works great when animating hundreds of points with SVG, but performance breaks down when you need to animate more than a thousand. This block demonstrates a simple approach to animating thousands of points between different layouts using canvas, d3-timer, and d3-ease.

    See the blog post for more details. (TBD).
    See the [blog post](https://bocoup.com/blog/smoothly-animate-thousands-of-points-with-html5-canvas-and-d3) for more details.
  2. pbeshai revised this gist Mar 11, 2017. 3 changed files with 1 addition and 8 deletions.
    1 change: 0 additions & 1 deletion dist.css
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    .bar rect{fill:#4682b4}.bar text{fill:#fff;font:10px sans-serif}
    2 changes: 1 addition & 1 deletion index.html
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    <meta name='viewport' content='width=device-width, initial-scale=1'>
    <meta charset='UTF-8'>
    <script src="https://d3js.org/d3.v4.min.js"></script>
    <title>Canvas Particles</title>
    <title>Animate thousands of points with canvas and D3</title>
    <style>
    html, body {
    padding: 0;
    6 changes: 0 additions & 6 deletions style.styl
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    .bar rect
    fill steelblue

    .bar text
    fill #fff
    font 10px sans-serif
  3. pbeshai revised this gist Mar 11, 2017. 10 changed files with 331 additions and 0 deletions.
    5 changes: 5 additions & 0 deletions README.md
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    ### Animate thousands of points with canvas and D3

    Using D3 and d3-transition works great when animating hundreds of points with SVG, but performance breaks down when you need to animate more than a thousand. This block demonstrates a simple approach to animating thousands of points between different layouts using canvas, d3-timer, and d3-ease.

    See the blog post for more details. (TBD).
    150 changes: 150 additions & 0 deletions common.js
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    /**
    * Given a set of points, lay them out in a phyllotaxis layout.
    * Mutates the `points` passed in by updating the x and y values.
    *
    * @param {Object[]} points The array of points to update. Will get `x` and `y` set.
    * @param {Number} pointWidth The size in pixels of the point's width. Should also include margin.
    * @param {Number} xOffset The x offset to apply to all points
    * @param {Number} yOffset The y offset to apply to all points
    *
    * @return {Object[]} points with modified x and y
    */
    function phyllotaxisLayout(points, pointWidth, xOffset = 0, yOffset = 0, iOffset = 0) {
    // theta determines the spiral of the layout
    const theta = Math.PI * (3 - Math.sqrt(5));

    const pointRadius = pointWidth / 2;

    points.forEach((point, i) => {
    const index = (i + iOffset) % points.length;
    const phylloX = pointRadius * Math.sqrt(index) * Math.cos(index * theta);
    const phylloY = pointRadius * Math.sqrt(index) * Math.sin(index * theta);

    point.x = xOffset + phylloX - pointRadius;
    point.y = yOffset + phylloY - pointRadius;
    });

    return points;
    }

    /**
    * Given a set of points, lay them out in a grid.
    * Mutates the `points` passed in by updating the x and y values.
    *
    * @param {Object[]} points The array of points to update. Will get `x` and `y` set.
    * @param {Number} pointWidth The size in pixels of the point's width. Should also include margin.
    * @param {Number} gridWidth The width of the grid of points
    *
    * @return {Object[]} points with modified x and y
    */
    function gridLayout(points, pointWidth, gridWidth) {
    const pointHeight = pointWidth;
    const pointsPerRow = Math.floor(gridWidth / pointWidth);
    const numRows = points.length / pointsPerRow;

    points.forEach((point, i) => {
    point.x = pointWidth * (i % pointsPerRow);
    point.y = pointHeight * Math.floor(i / pointsPerRow);
    });

    return points;
    }

    /**
    * Given a set of points, lay them out randomly.
    * Mutates the `points` passed in by updating the x and y values.
    *
    * @param {Object[]} points The array of points to update. Will get `x` and `y` set.
    * @param {Number} pointWidth The size in pixels of the point's width. Should also include margin.
    * @param {Number} width The width of the area to place them in
    * @param {Number} height The height of the area to place them in
    *
    * @return {Object[]} points with modified x and y
    */
    function randomLayout(points, pointWidth, width, height) {
    points.forEach((point, i) => {
    point.x = Math.random() * (width - pointWidth);
    point.y = Math.random() * (height - pointWidth);
    });

    return points;
    }

    /**
    * Given a set of points, lay them out in a sine wave.
    * Mutates the `points` passed in by updating the x and y values.
    *
    * @param {Object[]} points The array of points to update. Will get `x` and `y` set.
    * @param {Number} pointWidth The size in pixels of the point's width. Should also include margin.
    * @param {Number} width The width of the area to place them in
    * @param {Number} height The height of the area to place them in
    *
    * @return {Object[]} points with modified x and y
    */
    function sineLayout(points, pointWidth, width, height) {
    const amplitude = 0.3 * (height / 2);
    const yOffset = height / 2;
    const periods = 3;
    const yScale = d3.scaleLinear()
    .domain([0, points.length - 1])
    .range([0, periods * 2 * Math.PI]);

    points.forEach((point, i) => {
    point.x = (i / points.length) * (width - pointWidth);
    point.y = amplitude * Math.sin(yScale(i)) + yOffset;
    });

    return points;
    }

    /**
    * Given a set of points, lay them out in a spiral.
    * Mutates the `points` passed in by updating the x and y values.
    *
    * @param {Object[]} points The array of points to update. Will get `x` and `y` set.
    * @param {Number} pointWidth The size in pixels of the point's width. Should also include margin.
    * @param {Number} width The width of the area to place them in
    * @param {Number} height The height of the area to place them in
    *
    * @return {Object[]} points with modified x and y
    */
    function spiralLayout(points, pointWidth, width, height) {
    const amplitude = 0.3 * (height / 2);
    const xOffset = width / 2;
    const yOffset = height / 2;
    const periods = 20;

    const rScale = d3.scaleLinear()
    .domain([0, points.length -1])
    .range([0, Math.min(width / 2, height / 2) - pointWidth]);

    const thetaScale = d3.scaleLinear()
    .domain([0, points.length - 1])
    .range([0, periods * 2 * Math.PI]);

    points.forEach((point, i) => {
    point.x = rScale(i) * Math.cos(thetaScale(i)) + xOffset
    point.y = rScale(i) * Math.sin(thetaScale(i)) + yOffset;
    });

    return points;
    }




    /**
    * Generate an object array of `numPoints` length with unique IDs
    * and assigned colors
    */
    function createPoints(numPoints, pointWidth, width, height) {
    const colorScale = d3.scaleSequential(d3.interpolateViridis)
    .domain([numPoints - 1, 0]);

    const points = d3.range(numPoints).map(id => ({
    id,
    color: colorScale(id),
    }));

    return randomLayout(points, pointWidth, width, height);
    }
    1 change: 1 addition & 0 deletions dist.css
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    .bar rect{fill:#4682b4}.bar text{fill:#fff;font:10px sans-serif}
    2 changes: 2 additions & 0 deletions dist.js
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    function draw(){var t=canvas.node().getContext("2d");t.save(),t.clearRect(0,0,width,height);for(var i=0;i<points.length;++i){var n=points[i];t.fillStyle=n.color,t.fillRect(n.x,n.y,pointWidth,pointWidth)}t.restore()}function animate(t){points.forEach(function(t){t.sx=t.x,t.sy=t.y}),t(points),points.forEach(function(t){t.tx=t.x,t.ty=t.y}),timer=d3.timer(function(t){var i=Math.min(1,ease(t/duration));points.forEach(function(t){t.x=t.sx*(1-i)+t.tx*i,t.y=t.sy*(1-i)+t.ty*i}),draw(),1===i&&(timer.stop(),currLayout=(currLayout+1)%layouts.length,animate(layouts[currLayout]))})}var width=600,height=600,numPoints=7e3,pointWidth=4,pointMargin=3,duration=1500,ease=d3.easeCubic,timer,currLayout=0,points=createPoints(numPoints,pointWidth,width,height),toGrid=function(t){return gridLayout(t,pointWidth+pointMargin,width)},toSine=function(t){return sineLayout(t,pointWidth+pointMargin,width,height)},toSpiral=function(t){return spiralLayout(t,pointWidth+pointMargin,width,height)},toPhyllotaxis=function(t){return phyllotaxisLayout(t,pointWidth+pointMargin,width/2,height/2)},layouts=[toSine,toPhyllotaxis,toSpiral,toPhyllotaxis,toGrid],screenScale=window.devicePixelRatio||1,canvas=d3.select("body").append("canvas").attr("width",width*screenScale).attr("height",height*screenScale).style("width",width+"px").style("height",height+"px").on("click",function(){d3.select(".play-control").style("display",""),timer.stop()});canvas.node().getContext("2d").scale(screenScale,screenScale),toGrid(points),draw(),d3.select("body").append("div").attr("class","play-control").text("PLAY").on("click",function(){animate(layouts[currLayout]),d3.select(this).style("display","none")});
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    function phyllotaxisLayout(points,pointWidth,xOffset,yOffset,iOffset){if(xOffset===void 0)xOffset=0;if(yOffset===void 0)yOffset=0;if(iOffset===void 0)iOffset=0;var theta=Math.PI*(3-Math.sqrt(5));var pointRadius=pointWidth/2;points.forEach(function(point,i){var index=(i+iOffset)%points.length;var phylloX=pointRadius*Math.sqrt(index)*Math.cos(index*theta);var phylloY=pointRadius*Math.sqrt(index)*Math.sin(index*theta);point.x=xOffset+phylloX-pointRadius;point.y=yOffset+phylloY-pointRadius});return points}function gridLayout(points,pointWidth,gridWidth){var pointHeight=pointWidth;var pointsPerRow=Math.floor(gridWidth/pointWidth);var numRows=points.length/pointsPerRow;points.forEach(function(point,i){point.x=pointWidth*(i%pointsPerRow);point.y=pointHeight*Math.floor(i/pointsPerRow)});return points}function randomLayout(points,pointWidth,width,height){points.forEach(function(point,i){point.x=Math.random()*(width-pointWidth);point.y=Math.random()*(height-pointWidth)});return points}function sineLayout(points,pointWidth,width,height){var amplitude=.3*(height/2);var yOffset=height/2;var periods=3;var yScale=d3.scaleLinear().domain([0,points.length-1]).range([0,periods*2*Math.PI]);points.forEach(function(point,i){point.x=i/points.length*(width-pointWidth);point.y=amplitude*Math.sin(yScale(i))+yOffset});return points}function spiralLayout(points,pointWidth,width,height){var amplitude=.3*(height/2);var xOffset=width/2;var yOffset=height/2;var periods=20;var rScale=d3.scaleLinear().domain([0,points.length-1]).range([0,Math.min(width/2,height/2)-pointWidth]);var thetaScale=d3.scaleLinear().domain([0,points.length-1]).range([0,periods*2*Math.PI]);points.forEach(function(point,i){point.x=rScale(i)*Math.cos(thetaScale(i))+xOffset;point.y=rScale(i)*Math.sin(thetaScale(i))+yOffset});return points}function createPoints(numPoints,pointWidth,width,height){var colorScale=d3.scaleSequential(d3.interpolateViridis).domain([numPoints-1,0]);var points=d3.range(numPoints).map(function(id){return{id:id,color:colorScale(id)}});return randomLayout(points,pointWidth,width,height)}
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Will get `x` and `y` set.\n * @param {Number} pointWidth The size in pixels of the point's width. Should also include margin.\n * @param {Number} xOffset The x offset to apply to all points\n * @param {Number} yOffset The y offset to apply to all points\n *\n * @return {Object[]} points with modified x and y\n */\nfunction phyllotaxisLayout(points, pointWidth, xOffset = 0, yOffset = 0, iOffset = 0) {\n  // theta determines the spiral of the layout\n  const theta = Math.PI * (3 - Math.sqrt(5));\n\n  const pointRadius = pointWidth / 2;\n\n  points.forEach((point, i) => {\n    const index = (i + iOffset) % points.length;\n    const phylloX = pointRadius * Math.sqrt(index) * Math.cos(index * theta);\n    const phylloY = pointRadius * Math.sqrt(index) * Math.sin(index * theta);\n\n    point.x = xOffset + phylloX - pointRadius;\n    point.y = yOffset + phylloY - pointRadius;\n  });\n\n  return points;\n}\n\n/**\n * Given a set of points, lay them out in a grid.\n * Mutates the `points` passed in by updating the x and y values.\n *\n * @param {Object[]} points The array of points to update. Will get `x` and `y` set.\n * @param {Number} pointWidth The size in pixels of the point's width. Should also include margin.\n * @param {Number} gridWidth The width of the grid of points\n *\n * @return {Object[]} points with modified x and y\n */\nfunction gridLayout(points, pointWidth, gridWidth) {\n  const pointHeight = pointWidth;\n  const pointsPerRow = Math.floor(gridWidth / pointWidth);\n  const numRows = points.length / pointsPerRow;\n\n  points.forEach((point, i) => {\n    point.x = pointWidth * (i % pointsPerRow);\n    point.y = pointHeight * Math.floor(i / pointsPerRow);\n  });\n\n  return points;\n}\n\n/**\n * Given a set of points, lay them out randomly.\n * Mutates the `points` passed in by updating the x and y values.\n *\n * @param {Object[]} points The array of points to update. Will get `x` and `y` set.\n * @param {Number} pointWidth The size in pixels of the point's width. Should also include margin.\n * @param {Number} width The width of the area to place them in\n * @param {Number} height The height of the area to place them in\n *\n * @return {Object[]} points with modified x and y\n */\nfunction randomLayout(points, pointWidth, width, height) {\n  points.forEach((point, i) => {\n    point.x = Math.random() * (width - pointWidth);\n    point.y = Math.random() * (height - pointWidth);\n  });\n\n  return points;\n}\n\n/**\n * Given a set of points, lay them out in a sine wave.\n * Mutates the `points` passed in by updating the x and y values.\n *\n * @param {Object[]} points The array of points to update. Will get `x` and `y` set.\n * @param {Number} pointWidth The size in pixels of the point's width. Should also include margin.\n * @param {Number} width The width of the area to place them in\n * @param {Number} height The height of the area to place them in\n *\n * @return {Object[]} points with modified x and y\n */\nfunction sineLayout(points, pointWidth, width, height) {\n  const amplitude = 0.3 * (height / 2);\n  const yOffset = height / 2;\n  const periods = 3;\n  const yScale = d3.scaleLinear()\n    .domain([0, points.length - 1])\n    .range([0, periods * 2 * Math.PI]);\n\n  points.forEach((point, i) => {\n    point.x = (i / points.length) * (width - pointWidth);\n    point.y = amplitude * Math.sin(yScale(i)) + yOffset;\n  });\n\n  return points;\n}\n\n/**\n * Given a set of points, lay them out in a spiral.\n * Mutates the `points` passed in by updating the x and y values.\n *\n * @param {Object[]} points The array of points to update. Will get `x` and `y` set.\n * @param {Number} pointWidth The size in pixels of the point's width. Should also include margin.\n * @param {Number} width The width of the area to place them in\n * @param {Number} height The height of the area to place them in\n *\n * @return {Object[]} points with modified x and y\n */\nfunction spiralLayout(points, pointWidth, width, height) {\n  const amplitude = 0.3 * (height / 2);\n  const xOffset = width / 2;\n  const yOffset = height / 2;\n  const periods = 20;\n\n  const rScale = d3.scaleLinear()\n    .domain([0, points.length -1])\n    .range([0, Math.min(width / 2, height / 2) - pointWidth]);\n\n  const thetaScale = d3.scaleLinear()\n    .domain([0, points.length - 1])\n    .range([0, periods * 2 * Math.PI]);\n\n  points.forEach((point, i) => {\n    point.x = rScale(i) * Math.cos(thetaScale(i)) + xOffset\n    point.y = rScale(i) * Math.sin(thetaScale(i)) + yOffset;\n  });\n\n  return points;\n}\n\n\n\n\n/**\n * Generate an object array of `numPoints` length with unique IDs\n * and assigned colors\n */\nfunction createPoints(numPoints, pointWidth, width, height) {\n  const colorScale = d3.scaleSequential(d3.interpolateViridis)\n    .domain([numPoints - 1, 0]);\n\n  const points = d3.range(numPoints).map(id => ({\n    id,\n    color: colorScale(id),\n  }));\n\n  return randomLayout(points, pointWidth, width, height);\n}\n"]}
    45 changes: 45 additions & 0 deletions index.html
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    <!DOCTYPE html>
    <html lang="en">
    <head>
    <meta name='viewport' content='width=device-width, initial-scale=1'>
    <meta charset='UTF-8'>
    <script src="https://d3js.org/d3.v4.min.js"></script>
    <title>Canvas Particles</title>
    <style>
    html, body {
    padding: 0;
    margin: 0;
    }
    canvas {
    cursor: pointer;
    }

    .play-control {
    position: absolute;
    top: 0px;
    left: 0px;
    width: 600px;
    height: 600px;
    line-height: 600px;
    text-align: center;
    background-color: rgba(0, 0, 0, 0.1);
    color: #f4f4f4;
    text-shadow: rgba(0, 0, 0, 0.7) 3px 3px 0px;
    font-size: 100px;
    font-family: 'helvetica neue', calibri, sans-serif;
    font-weight: 100;
    cursor: pointer;
    }

    .play-control:hover {
    color: #fff;
    text-shadow: #000 3px 3px 0px;
    background-color: rgba(0, 0, 0, 0.04);
    }
    </style>
    </head>
    <body>
    <script src="dist_common.js"></script>
    <script src="dist.js"></script>
    </body>
    </html>
    Binary file added preview.png
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    120 changes: 120 additions & 0 deletions script.js
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    // canvas settings
    const width = 600;
    const height = 600;

    // point settings
    const numPoints = 7000;
    const pointWidth = 4;
    const pointMargin = 3;

    // animation settings
    const duration = 1500;
    const ease = d3.easeCubic;
    let timer;
    let currLayout = 0;

    // create set of points
    const points = createPoints(numPoints, pointWidth, width, height);

    // wrap layout helpers so they only take points as an argument
    const toGrid = (points) => gridLayout(points,
    pointWidth + pointMargin, width);
    const toSine = (points) => sineLayout(points,
    pointWidth + pointMargin, width, height);
    const toSpiral = (points) => spiralLayout(points,
    pointWidth + pointMargin, width, height);
    const toPhyllotaxis = (points) => phyllotaxisLayout(points,
    pointWidth + pointMargin, width / 2, height / 2);

    // store the layouts in an array to sequence through
    const layouts = [toSine, toPhyllotaxis, toSpiral, toPhyllotaxis, toGrid];

    // draw the points based on their current layout
    function draw() {
    const ctx = canvas.node().getContext('2d');
    ctx.save();

    // erase what is on the canvas currently
    ctx.clearRect(0, 0, width, height);

    // draw each point as a rectangle
    for (let i = 0; i < points.length; ++i) {
    const point = points[i];
    ctx.fillStyle = point.color;
    ctx.fillRect(point.x, point.y, pointWidth, pointWidth);
    }

    ctx.restore();
    }

    // animate the points to a given layout
    function animate(layout) {
    // store the source position
    points.forEach(point => {
    point.sx = point.x;
    point.sy = point.y;
    });

    // get destination x and y position on each point
    layout(points);

    // store the destination position
    points.forEach(point => {
    point.tx = point.x;
    point.ty = point.y;
    });

    timer = d3.timer((elapsed) => {
    // compute how far through the animation we are (0 to 1)
    const t = Math.min(1, ease(elapsed / duration));

    // update point positions (interpolate between source and target)
    points.forEach(point => {
    point.x = point.sx * (1 - t) + point.tx * t;
    point.y = point.sy * (1 - t) + point.ty * t;
    });

    // update what is drawn on screen
    draw();

    // if this animation is over
    if (t === 1) {
    // stop this timer for this layout and start a new one
    timer.stop();

    // update to use next layout
    currLayout = (currLayout + 1) % layouts.length;

    // start animation for next layout
    animate(layouts[currLayout]);
    }
    });
    }

    // create the canvas
    const screenScale = window.devicePixelRatio || 1;
    const canvas = d3.select('body').append('canvas')
    .attr('width', width * screenScale)
    .attr('height', height * screenScale)
    .style('width', `${width}px`)
    .style('height', `${height}px`)
    .on('click', function () {
    d3.select('.play-control').style('display', '');
    timer.stop();
    });
    canvas.node().getContext('2d').scale(screenScale, screenScale);

    // start off as a grid
    toGrid(points);
    draw();

    d3.select('body').append('div')
    .attr('class', 'play-control')
    .text('PLAY')
    .on('click', function () {
    // start the animation
    animate(layouts[currLayout]);

    // remove the play control
    d3.select(this).style('display', 'none');
    });
    6 changes: 6 additions & 0 deletions style.styl
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    .bar rect
    fill steelblue

    .bar text
    fill #fff
    font 10px sans-serif
    Binary file added thumbnail.png
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  4. Peter Beshai created this gist Mar 11, 2017.
    3 changes: 3 additions & 0 deletions .block
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    license: mit
    height: 620
    border: no