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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>Animation</title>
<script src="lib/stats.js"></script>
<script src="https://d3js.org/d3.v4.min.js"></script>
</head>
<body style="margin:0px;">
<canvas id="main" width="600" height="600"></canvas>
<script type="text/javascript">
function setParam(cleanList, newVal) {
var params = location.search.split('&');
for (var i = params.length - 1; i >= 0; i--) {
for (var j = 0; j < cleanList.length; j++) {
if (params[i] === cleanList[j]) {
params.splice(i, 1);
}
}
}
newVal && params.push(newVal);
params.sort();
location.search = params.join('&');
}
function hasParam(val) {
var params = location.search.split('&');
for (var i = params.length - 1; i >= 0; i--) {
if (params[i] === val) {
return true;
}
}
return false;
}
var withText = hasParam('with-text');
var renderMode = hasParam('svg') ? 'svg' : 'canvas';
var ctx = document.getElementById('main').getContext('2d');
var width = ctx.canvas.width;
var height = ctx.canvas.height;
ctx.canvas.width *= window.devicePixelRatio;
ctx.canvas.height *= window.devicePixelRatio;
ctx.canvas.style.width = width + 'px';
ctx.canvas.style.height = height + 'px';
ctx.scale(window.devicePixelRatio, window.devicePixelRatio);
var stats = new Stats();
document.body.appendChild(stats.dom);
/**
* 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
var theta = Math.PI * (3 - Math.sqrt(5));
var pointRadius = pointWidth / 2;
points.forEach((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;
}
/**
* 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) {
var pointHeight = pointWidth;
var pointsPerRow = Math.floor(gridWidth / pointWidth);
var 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) {
var amplitude = 0.3 * (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((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) {
var amplitude = 0.3 * (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((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) {
var colorScale = d3.scaleSequential(d3.interpolateViridis)
.domain([numPoints - 1, 0]);
var points = d3.range(numPoints).map(id => ({
id,
color: colorScale(id),
}));
return randomLayout(points, pointWidth, width, height);
}
// point settings
var numPoints = withText ? 2000 : 10000;
var pointWidth = 3;
var pointMargin = 3;
// animation settings
var duration = 1500;
var ease = d3.easeCubic;
var timer;
var currLayout = 0;
// create set of points
var points = createPoints(numPoints, pointWidth, width, height);
// wrap layout helpers so they only take points as an argument
var toGrid = (points) => gridLayout(points,
pointWidth + pointMargin, width);
var toSine = (points) => sineLayout(points,
pointWidth + pointMargin, width, height);
var toSpiral = (points) => spiralLayout(points,
pointWidth + pointMargin, width, height);
var toPhyllotaxis = (points) => phyllotaxisLayout(points,
pointWidth + pointMargin, width / 2, height / 2);
// store the layouts in an array to sequence through
var layouts = [toSine, toPhyllotaxis, toSpiral, toPhyllotaxis, toGrid];
// animate the points to a given layout
function animate(rects, 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) => {
stats.begin();
// compute how far through the animation we are (0 to 1)
var 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
ctx.clearRect(0, 0, width, height);
for (let i = 0; i < rects.length; i++) {
var rect = rects[i];
rect.shape.x = rect.point.x;
rect.shape.y = rect.point.y;
}
for (let i = 0; i < rects.length;) {
ctx.fillStyle = rects[i].style.fill;
ctx.beginPath();
for (let k = 0; k < 20; k++) {
var rect = rects[i++];
// ctx.fillRect(rect.shape.x, rect.shape.y, rect.shape.width, rect.shape.height);
ctx.rect(
rect.shape.x,
rect.shape.y,
rect.shape.width,
rect.shape.height
);
}
ctx.fill();
}
// 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(rects, layouts[currLayout]);
}
stats.end();
});
}
console.time('init');
var rects = [];
for (var i = 0; i < points.length; i++) {
var pt = points[i];
var rect = {
shape: {
width: pointWidth,
height: pointWidth
},
style: {
fill: pt.color
},
silent: true,
point: pt
};
rects.push(rect);
}
console.timeEnd('init');
// start off as a grid
toGrid(points);
rects.forEach(function(rect, idx) {
rect.shape.x = rect.point.x;
rect.shape.y = rect.point.y;
});
setTimeout(function () {
// start the animation
animate(rects, layouts[currLayout]);
}, 1000);
</script>
</body>
</html>
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