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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| .ball { | |
| fill: white; | |
| stroke: black; | |
| stroke-width: 2; | |
| } | |
| </style> | |
| <body> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| <script> | |
| var num_balls = 40, | |
| ball_max_y = 100, | |
| ball_radius = 9, | |
| ball_spacing = 20, | |
| margin = 10, | |
| width = ((num_balls - 1) * ball_spacing) + (2 * margin), | |
| height = (2 * ball_max_y) + (2 * margin), | |
| time = 0, | |
| colors = ['red','green','blue']; | |
| var svg = d3.select('body').append('svg') | |
| .attr('width', 960) | |
| .attr('height', 500) | |
| .append('g') | |
| .attr('transform', 'translate(' + ((960 - width) / 2) + ',' + | |
| ((500 - height) / 2) + ')'); | |
| var balls = svg.selectAll('circle.ball') | |
| .data(new Array(num_balls)).enter() | |
| .append('circle') | |
| .attr('class', 'ball') | |
| .attr('r', ball_radius); | |
| function get_y(ball_num, time) { | |
| return (ball_max_y + margin) + (ball_max_y * | |
| (Math.sin((time / 2 * (ball_num / 500 + 0.02)) % 2 * Math.PI))); | |
| } | |
| function update(time) { | |
| balls.attr('transform', function(d, i) { | |
| return 'translate(' + (i * ball_spacing + margin) + ',' + | |
| get_y(i, time) + ')'; | |
| }); | |
| } | |
| (function animationLoop(){ | |
| requestAnimationFrame(animationLoop); | |
| update(time++); | |
| })(); | |
| </script> | |
| </body> |
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