d3 gauge

forked from msqr's block: d3 gauge

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
	<meta name="viewport" content="width=320" />
	<meta name="apple-mobile-web-app-capable" content="yes" />
	<title>Gauge</title>
<script src="https://d3js.org/d3.v4.min.js"></script>
	<style>
	body {
		font-family:  Helvetica, Arial, sans-serif;
		margin: 32px;
	}

#power-gauge g.arc {
		fill: steelblue;
	}

#power-gauge g.pointer {
		fill: #e85116;
		stroke: #b64011;
	}
	
	#power-gauge g.label text {
		text-anchor: middle;
		font-size: 14px;
		font-weight: bold;
		fill: #666;
	}
	</style>
</head>
<body>
<div id="power-gauge"></div>
	
<script>
var gauge = function(container, configuration) {
	var that = {};
	var config = {
		size						: 200,
		clipWidth					: 200,
		clipHeight					: 110,
		ringInset					: 20,
		ringWidth					: 20,
		
		pointerWidth				: 10,
		pointerTailLength			: 5,
		pointerHeadLengthPercent	: 0.9,
		
		minValue					: 0,
		maxValue					: 10,
		
		minAngle					: -90,
		maxAngle					: 90,
		
		transitionMs				: 750,
		
		majorTicks					: 5,
		labelFormat					: d3.format(',g'),
		labelInset					: 10,
		
		arcColorFn					: d3.interpolateHsl(d3.rgb('#e8e2ca'), d3.rgb('#3e6c0a'))
	};
	var range = undefined;
	var r = undefined;
	var pointerHeadLength = undefined;
	var value = 0;
	
	var svg = undefined;
	var arc = undefined;
	var scale = undefined;
	var ticks = undefined;
	var tickData = undefined;
	var pointer = undefined;

// a linear scale that maps domain values to a percent from 0..1
		scale = d3.scaleLinear()
			.range([0,1])
			.domain([config.minValue, config.maxValue]);
			
		ticks = scale.ticks(config.majorTicks);
		tickData = d3.range(config.majorTicks).map(function() {return 1/config.majorTicks;});
		
		arc = d3.arc()
			.innerRadius(r - config.ringWidth - config.ringInset)
			.outerRadius(r - config.ringInset)
			.startAngle(function(d, i) {
				var ratio = d * i;
				return deg2rad(config.minAngle + (ratio * range));
			})
			.endAngle(function(d, i) {
				var ratio = d * (i+1);
				return deg2rad(config.minAngle + (ratio * range));
			});
	}
	that.configure = configure;
	
	function centerTranslation() {
		return 'translate('+r +','+ r +')';
	}
	
	function isRendered() {
		return (svg !== undefined);
	}
	that.isRendered = isRendered;
	
	function render(newValue) {
		svg = d3.select(container)
			.append('svg:svg')
				.attr('class', 'gauge')
				.attr('width', config.clipWidth)
				.attr('height', config.clipHeight);
		
		var centerTx = centerTranslation();
		
		var arcs = svg.append('g')
				.attr('class', 'arc')
				.attr('transform', centerTx);
		
		arcs.selectAll('path')
				.data(tickData)
			.enter().append('path')
				.attr('fill', function(d, i) {
					return config.arcColorFn(d * i);
				})
				.attr('d', arc);
		
		var lg = svg.append('g')
				.attr('class', 'label')
				.attr('transform', centerTx);
		lg.selectAll('text')
				.data(ticks)
			.enter().append('text')
				.attr('transform', function(d) {
					var ratio = scale(d);
					var newAngle = config.minAngle + (ratio * range);
					return 'rotate(' +newAngle +') translate(0,' +(config.labelInset - r) +')';
				})
				.text(config.labelFormat);

configure(configuration);
	
	return that;
};
</script>

if ( !window.isLoaded ) {
	window.addEventListener("load", function() {
		onDocumentReady();
	}, false);
} else {
	onDocumentReady();
}
</script>
</body>
</html>

https://d3js.org/d3.v4.min.js