Using d3.timer() to animate a bouncing ball
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June 3, 2017 20:10
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Animating with d3.timer() - multiple circles
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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 = createRandomCircles(); | |
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; | |
}); | |
} | |
function createRandomCircles() { | |
var circle_data = []; | |
var numCircles = Math.floor(Math.random() * 10) + 1; | |
for (var i = 0; i < numCircles; i++) { | |
circle_data.push({ | |
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, | |
checked: false, | |
}) | |
} | |
return circle_data; | |
} |
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html, body, #vis { | |
height: 100%; | |
margin: 0; | |
} |
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