Using d3.timer() to animate a bouncing ball
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June 3, 2017 20:05
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Animating with d3.timer()
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| license: MIT | |
| border: no |
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <script src="http://d3js.org/d3.v4.min.js"></script> | |
| <link rel="stylesheet" href="style.css"> | |
| <title>Animation with D3</title> | |
| </head> | |
| <body> | |
| <div id="vis"></div> | |
| <script src="script.js"></script> | |
| </body> | |
| </html> |
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| var width = 500; | |
| var height = 500; | |
| var margin = { | |
| top: 20, | |
| left: 20, | |
| bottom: 20, | |
| right: 20 | |
| }; | |
| var radius = 5; | |
| var svg = d3.select('#vis') | |
| .append('svg') | |
| .attr('width', width) | |
| .attr('height', height) | |
| .append('g') | |
| .attr('transform', 'translate(' + margin.left + ',' + margin.right + ')'); | |
| width = width - margin.left - margin.right; | |
| height = height - margin.top - margin.bottom; | |
| var circle_data = [{ | |
| x: Math.random() * width, | |
| y: Math.random() * height, | |
| x_diff: Math.random() < 0.5 ? 1 : -1, | |
| y_diff: Math.random() < 0.5 ? 1 : -1, | |
| speed: Math.random() * 5, | |
| }]; | |
| var circles = svg.selectAll('.circle') | |
| .data(circle_data) | |
| .enter() | |
| .append('circle') | |
| .attr('class', 'circle') | |
| .attr('r', radius) | |
| .attr('fill', 'blue') | |
| .attr('cx', function(d) { | |
| return d.x; | |
| }) | |
| .attr('cy', function(d) { | |
| return d.y; | |
| }); | |
| d3.timer(animate); | |
| function animate(elapsed) { | |
| circles | |
| .attr('cx', function(d) { | |
| d.x = d.x + (d.speed * d.x_diff); | |
| if (d.x <= 0 || d.x >= width) { | |
| d.x_diff = d.x_diff * -1; | |
| } | |
| return d.x; | |
| }) | |
| .attr('cy', function(d) { | |
| d.y = d.y + (d.speed * d.y_diff); | |
| if (d.y <= 0 || d.y >= height) { | |
| d.y_diff = d.y_diff * -1; | |
| } | |
| return d.y; | |
| }); | |
| } |
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| html, body, #vis { | |
| height: 100%; | |
| margin: 0; | |
| } |
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