An analog clock, using the D3 radial axis to render the frame.
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April 20, 2017 19:20
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Analog Clock
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license: mit |
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<head> | |
<script src="//cdnjs.cloudflare.com/ajax/libs/babel-standalone/6.23.1/babel.min.js"></script> | |
<script src="//cdnjs.cloudflare.com/ajax/libs/d3/4.6.0/d3.min.js"></script> | |
<script src="//unpkg.com/d3-radial-axis@1.5/dist/d3-radial-axis.min.js"></script> | |
<link rel="stylesheet" href="style.css"> | |
</head> | |
<body> | |
<svg id="canvas"></svg> | |
<script type="text/babel" src="index.js"></script> | |
</body> |
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const r = Math.min(window.innerWidth, window.innerHeight) / 2, | |
secMinScale = d3.scaleLinear().domain([0, 60]).range([0, 360]), | |
hourScale = d3.scaleLinear().domain([0, 12]).range([0, 360]) | |
const pointersRelDimensions = [ | |
{ class: 'hour', width: 0.05, height: 0.55 }, | |
{ class: 'min', width: 0.05, height: 0.85 }, | |
{ class: 'sec', width: 0.02, height: 0.85 } | |
] | |
// Size canvas | |
const svg = d3.select('#canvas') | |
.attr('width', r * 2) | |
.attr('height', r * 2) | |
.attr('viewBox', `${-r} ${-r} ${r*2} ${r*2}`) | |
// Add background | |
svg.append('circle').classed('background', true) | |
.attr('cx', 0) | |
.attr('cy', 0) | |
.attr('r', r) | |
// Add axis | |
svg.append('g').classed('axis', true) | |
.call(d3.axisRadialInner( | |
hourScale.copy().range([0, 2 * Math.PI]), | |
r - 1 | |
) | |
.ticks(12) | |
.tickSize(12) | |
) | |
svg.append('g').classed('minor-ticks', true) | |
.call(d3.axisRadialInner( | |
secMinScale.copy().range([0, 2 * Math.PI]), | |
r - 1 | |
) | |
.ticks(60) | |
.tickSize(6) | |
) | |
// Add pointers | |
svg.append('g').classed('pointers', true) | |
.attr('transform', `scale(${r})`) | |
.selectAll('rect') | |
.data(pointersRelDimensions) | |
.enter() | |
.append('rect') | |
.attr('class', d=> d.class) | |
.attr('x', d => -d.width/2) | |
.attr('y', d => -d.height + d.width/2) | |
.attr('width', d => d.width) | |
.attr('height', d => d.height) | |
.attr('rx', 0.02) | |
.attr('ry', 0.03) | |
// Add center | |
svg.select('.pointers') | |
.append('circle').classed('center', true) | |
.attr('cx', 0) | |
.attr('cy', 0) | |
.attr('r', 0.02) | |
// Kick-off clock | |
framed() | |
function framed() { | |
const dt = new Date() | |
const ms = dt.getMilliseconds(), | |
secs = dt.getSeconds() + ms/1000, | |
mins = dt.getMinutes() + secs/60, | |
hours = dt.getHours()%12 + mins/60 | |
d3.select('.pointers .hour').attr('transform', `rotate(${hourScale(hours)})`) | |
d3.select('.pointers .min').attr('transform', `rotate(${secMinScale(mins)})`) | |
d3.select('.pointers .sec').attr('transform', `rotate(${secMinScale(secs)})`) | |
requestAnimationFrame(framed) | |
} |
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body { | |
text-align: center; | |
font-family: Sans-serif; | |
margin: 0; | |
} | |
.background { | |
stroke-width: 0; | |
fill: Lavender; | |
fill-opacity: 0.3; | |
} | |
.axis .domain, .axis .tick line { | |
stroke-width: 2px; | |
stroke: DarkSlateGrey; | |
} | |
.axis .tick:first-of-type { | |
display: none; // hide 0 tick | |
} | |
.axis .tick text { | |
font-size: 16px; | |
} | |
.minor-ticks text, .minor-ticks path { | |
display: none; // Hide all but ticks | |
} | |
.pointers rect { | |
fill-opacity: 0.7; | |
} | |
.pointers .hour, .pointers .min { | |
fill: green; | |
} | |
.pointers .sec { | |
fill: red; | |
} | |
.pointers .center { | |
fill: darkgrey; | |
} |
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