A recreation of a lovely GIF by Dave Whyte. As the Exploratorium explains, “Wave motion at the surface of water is made up of small circular motions of parcels of water.”
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Wave Motion
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| canvas { | |
| position: absolute; | |
| } | |
| </style> | |
| <canvas id="canvas-back" width="960" height="500"></canvas> | |
| <canvas id="canvas-front" width="960" height="500"></canvas> | |
| <script> | |
| /* https://github.com/d3/d3-timer Copyright 2015 Mike Bostock */ | |
| !function(t,e){"object"==typeof exports&&"undefined"!=typeof module?e(exports):"function"==typeof define&&define.amd?define("d3-timer",["exports"],e):e(t.d3_timer={})}(this,function(t){"use strict";function e(t,e,n){this.id=++c,this.restart(t,e,n)}function n(t,n,i){return new e(t,n,i)}function i(t){t=null==t?Date.now():+t,++l;try{for(var e,n=a;n;)t>=n.time&&(e=n.callback)(t-n.time,t),n=n.next}finally{--l}}function o(){l=f=0;try{i()}finally{for(var t,e=a,n=1/0;e;)e.callback?(n>e.time&&(n=e.time),e=(t=e).next):e=t?t.next=e.next:a=e.next;u=t,r(n)}}function r(t){if(!l){f&&(f=clearTimeout(f));var e=t-Date.now();e>24?1/0>t&&(f=setTimeout(o,e)):(l=1,s(o))}}var a,u,l=0,f=0,c=0,m={},s="undefined"!=typeof window&&(window.requestAnimationFrame||window.msRequestAnimationFrame||window.mozRequestAnimationFrame||window.webkitRequestAnimationFrame||window.oRequestAnimationFrame)||function(t){return setTimeout(t,17)};e.prototype=n.prototype={restart:function(t,e,n){if("function"!=typeof t)throw new TypeError("callback is not a function");n=(null==n?Date.now():+n)+(null==e?0:+e);var i=this.id,o=m[i];o?(o.callback=t,o.time=n):(o={next:null,callback:t,time:n},u?u.next=o:a=o,m[i]=u=o),r()},stop:function(){var t=this.id,e=m[t];e&&(e.callback=null,e.time=1/0,delete m[t],r())}};var d="0.0.6";t.version=d,t.timer=n,t.timerFlush=i}); | |
| var canvasBack = document.getElementById("canvas-back"), | |
| canvasFront = document.getElementById("canvas-front"); | |
| var width = canvasBack.width, | |
| height = canvasBack.height, | |
| ringRadius = 24, | |
| ringSeparation = 1.1 * ringRadius, | |
| dotRadius = 3.5, | |
| n = (width + ringRadius) / ringSeparation, | |
| m = (height + ringRadius) / ringSeparation; | |
| var contextBack, | |
| contextFront, | |
| scale = window.devicePixelRatio; | |
| if (scale > 1) { | |
| canvasFront.style.width = canvasBack.style.width = width + "px"; | |
| canvasFront.style.height = canvasBack.style.height = height + "px"; | |
| canvasFront.width = canvasBack.width = width * scale; | |
| canvasFront.height = canvasBack.height = height * scale; | |
| contextBack = canvasBack.getContext("2d"); | |
| contextFront = canvasFront.getContext("2d"); | |
| contextBack.scale(scale, scale); | |
| contextFront.scale(scale, scale); | |
| } else { | |
| contextBack = canvasBack.getContext("2d"); | |
| contextFront = canvasFront.getContext("2d"); | |
| } | |
| contextBack.strokeStyle = "#EEE"; | |
| for (var i = -1; i < n; ++i) { | |
| for (var j = -1; j < m; ++j) { | |
| contextBack.beginPath(); | |
| contextBack.arc(i * ringSeparation, j * ringSeparation, ringRadius, 0, 2 * Math.PI); | |
| contextBack.stroke(); | |
| } | |
| } | |
| colorcenter = 128; | |
| colorwidth = 127; | |
| frequency = n + m; | |
| phase = 0; | |
| d3_timer.timer(function(elapsed) { | |
| contextFront.clearRect(0, 0, width, height); | |
| for (var i = -1; i < n; ++i) { | |
| for (var j = -1; j < m; ++j) { | |
| // contextFront.fillStyle = 'rgb(' + | |
| // Math.floor(255-(255/n)*i) + ',' + | |
| // Math.floor(255-(255/m)*j) + ',' + | |
| // Math.floor(255-(255/elapsed) ) + ')'; | |
| phase = elapsed / 255; | |
| // colorcenter = Math.sin( phase ) | |
| var red = Math.sin(frequency*(i + j)+2+phase) * colorwidth + colorcenter; | |
| var green = Math.sin(frequency*(i + j)+0+phase) * colorwidth + colorcenter; | |
| var blue = Math.sin(frequency*(i + j)+4+phase) * colorwidth + colorcenter; | |
| var color = ((i + j) / 6 + elapsed / 42.5) % ( 255 ); | |
| // contextFront.fillStyle = 'rgb(' + | |
| // Math.floor( 255-(255/n)*i )+ ',' + | |
| // Math.floor( color )+ ',' + | |
| // Math.floor( 255-(255/m)*j )+ ')'; | |
| contextFront.fillStyle = 'rgb(' + | |
| Math.floor(red) + ',' + | |
| Math.floor(green) + ',' + | |
| Math.floor(blue) + ')'; | |
| contextFront.save(); | |
| contextFront.beginPath(); | |
| contextFront.translate(i * ringSeparation, j * ringSeparation); | |
| contextFront.rotate((i + j) / 6 + elapsed / 200); | |
| contextFront.arc(ringRadius, 0, dotRadius, 0, 2 * Math.PI); | |
| contextFront.fill(); | |
| contextFront.restore(); | |
| } | |
| } | |
| }); | |
| </script> |
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