iPad-friendly. Drag the control points to modify the curve.
View it here.
This is a modification of Jason Davies work.
Last active
April 26, 2019 19:28
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Animated Bezier Curve
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <meta http-equiv="content-type" content="text/html; charset=UTF-8"> | |
| <meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=no"> | |
| <link href='http://fonts.googleapis.com/css?family=Yanone+Kaffeesatz:400' rel='stylesheet' type='text/css'> | |
| <style> | |
| svg { | |
| position: absolute; | |
| top: 0; | |
| left: 0; | |
| } | |
| .curve, .line { | |
| fill: none; | |
| stroke-width: 1px; | |
| } | |
| .curve { | |
| stroke: red; | |
| stroke-width: 3px; | |
| } | |
| .control { | |
| fill: #ccc; | |
| stroke: #000; | |
| stroke-width: .5px; | |
| } | |
| .t, .controltext { | |
| font-family: "Yanone Kaffeesatz"; | |
| font-weight: 400; | |
| font-size: 1em; | |
| } | |
| </style> | |
| <body> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| <script> | |
| var w = 700, | |
| h = 700, | |
| t = .5, | |
| delta = .01, | |
| padding = 10, | |
| points = [{x: 20, y: 250}, {x: 20, y: 30}, {x: 100, y: 20}, {x: 200, y: 250}, {x: | |
| 225, y: 125}], | |
| bezier = {}, | |
| line = d3.svg.line().x(x).y(y), | |
| n = 4, | |
| orders = d3.range(5, n + 2); | |
| var vis = d3.select("body").selectAll("svg") | |
| .data(orders) | |
| .enter().append("svg:svg") | |
| .attr("width", w + 2 * padding) | |
| .attr("height", h + 2 * padding) | |
| .append("svg:g") | |
| .attr("transform", "translate(" + padding + "," + padding + ")"); | |
| update(); | |
| vis.selectAll("circle.control") | |
| .data(function(d) { return points.slice(0, d) }) | |
| .enter().append("svg:circle") | |
| .attr("class", "control") | |
| .attr("r", 17) | |
| .attr("cx", x) | |
| .attr("cy", y) | |
| .call(d3.behavior.drag() | |
| .on("dragstart", function(d) { | |
| this.__origin__ = [d.x, d.y]; | |
| }) | |
| .on("drag", function(d) { | |
| d.x = Math.min(w, Math.max(0, this.__origin__[0] += d3.event.dx)); | |
| d.y = Math.min(h, Math.max(0, this.__origin__[1] += d3.event.dy)); | |
| bezier = {}; | |
| update(); | |
| vis.selectAll("circle.control") | |
| .attr("cx", x) | |
| .attr("cy", y); | |
| }) | |
| .on("dragend", function() { | |
| delete this.__origin__; | |
| })); | |
| vis.append("svg:text") | |
| .attr("class", "t") | |
| .attr("x", w / 2) | |
| .attr("y", h) | |
| .attr("text-anchor", "middle"); | |
| vis.selectAll("text.controltext") | |
| .data(function(d) { return points.slice(0, d); }) | |
| .enter().append("svg:text") | |
| .attr("class", "controltext") | |
| .attr("dx", "20px") | |
| .attr("dy", ".4em") | |
| .text(function(d, i) { return "P" + i }); | |
| var last = 0; | |
| d3.timer(function(elapsed) { | |
| t = (t + (elapsed - last) / 5000) % 1; | |
| last = elapsed; | |
| update(); | |
| }); | |
| function update() { | |
| var interpolation = vis.selectAll("g") | |
| .data(function(d) { return getLevels(d, t); }); | |
| interpolation.enter().append("svg:g") | |
| .style("fill", colour) | |
| .style("stroke", colour); | |
| var circle = interpolation.selectAll("circle") | |
| .data(Object); | |
| circle.enter().append("svg:circle") | |
| .attr("r", 3); | |
| circle | |
| .attr("cx", x) | |
| .attr("cy", y); | |
| var path = interpolation.selectAll("path") | |
| .data(function(d) { return [d]; }); | |
| path.enter().append("svg:path") | |
| .attr("class", "line") | |
| .attr("d", line); | |
| path.attr("d", line); | |
| var curve = vis.selectAll("path.curve") | |
| .data(getCurve); | |
| curve.enter().append("svg:path") | |
| .attr("class", "curve"); | |
| curve.attr("d", line); | |
| vis.selectAll("text.controltext") | |
| .attr("x", x) | |
| .attr("y", y); | |
| } | |
| function interpolate(d, p) { | |
| if (arguments.length < 2) p = t; | |
| var r = []; | |
| for (var i=1; i<d.length; i++) { | |
| var d0 = d[i-1], d1 = d[i]; | |
| r.push({x: d0.x + (d1.x - d0.x) * p, y: d0.y + (d1.y - d0.y) * p}); | |
| } | |
| return r; | |
| } | |
| function getLevels(d, t_) { | |
| if (arguments.length < 2) t_ = t; | |
| var x = [points.slice(0, d)]; | |
| for (var i=1; i<d; i++) { | |
| x.push(interpolate(x[x.length-1], t_)); | |
| } | |
| return x; | |
| } | |
| function getCurve(d) { | |
| var curve = bezier[d]; | |
| if (!curve) { | |
| curve = bezier[d] = []; | |
| for (var t_=0; t_<=1; t_+=delta) { | |
| var x = getLevels(d, t_); | |
| curve.push(x[x.length-1][0]); | |
| } | |
| } | |
| return [curve.slice(0, t / delta + 1)]; | |
| } | |
| function x(d) { return d.x; } | |
| function y(d) { return d.y; } | |
| function colour(d, i) { | |
| return d.length > 1 ? ["#ccc", "yellow", "blue", "green"][i] : "red"; | |
| } | |
| var static = function(event) { event.preventDefault(); } | |
| document.body.addEventListener('touchmove', static, false); | |
| </script> |
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