A simple gauge chart using d3 Inspired by Jake Trent's Codepen snippet
To move the pointer needle, type in following code in you javascript console
needle.moveTo(.25)
Created
February 22, 2014 08:41
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D3 Gauge
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| var needle; | |
| (function(){ | |
| var arc, arcEndRad, arcStartRad, barWidth, chart, chartInset, degToRad, | |
| endPadRad, height, margin, numSections, padRad, percToDeg, percToRad, | |
| percent, radius, sectionIndx, sectionPerc, startPadRad, svg, totalPercent, width, _i; | |
| percent = .65; | |
| numSections = 1; | |
| sectionPerc = 1 / numSections / 2; | |
| padRad = 0.05; | |
| chartInset = 10; | |
| // Orientation of gauge: | |
| totalPercent = .75; | |
| el = d3.select('.chart-gauge'); | |
| margin = { | |
| top: 20, | |
| right: 20, | |
| bottom: 30, | |
| left: 20 | |
| }; | |
| width = el[0][0].offsetWidth - margin.left - margin.right; | |
| height = width; | |
| radius = Math.min(width, height) / 2; | |
| barWidth = 40 * width / 300; | |
| /* | |
| Utility methods | |
| */ | |
| percToDeg = function(perc) { | |
| return perc * 360; | |
| }; | |
| percToRad = function(perc) { | |
| return degToRad(percToDeg(perc)); | |
| }; | |
| degToRad = function(deg) { | |
| return deg * Math.PI / 180; | |
| }; | |
| // Create SVG element | |
| svg = el.append('svg').attr('width', width + margin.left + margin.right).attr('height', height + margin.top + margin.bottom); | |
| // Add layer for the panel | |
| chart = svg.append('g').attr('transform', "translate(" + ((width + margin.left) / 2) + ", " + ((height + margin.top) / 2) + ")"); | |
| for (sectionIndx = _i = 1; _i <= numSections; ++_i) { | |
| sectionIndx = _i; | |
| arcStartRad = percToRad(totalPercent); | |
| arcEndRad = arcStartRad + percToRad(sectionPerc); | |
| totalPercent += sectionPerc; | |
| // Leave margin for intermediate sections | |
| startPadRad = sectionIndx === 0 ? 0 : padRad / 2; | |
| endPadRad = sectionIndx === numSections ? 0 : padRad / 2; | |
| arc = d3.svg.arc().outerRadius(radius - chartInset).innerRadius(radius - chartInset - barWidth) | |
| .startAngle(arcStartRad + startPadRad).endAngle(arcEndRad - endPadRad); | |
| chart.append('path').attr('class', "arc chart-color" + sectionIndx).attr('d', arc); | |
| } | |
| var Needle = (function() { | |
| /** | |
| * Helper function that returns the `d` value | |
| * for moving the needle | |
| **/ | |
| var recalcPointerPos = function(perc) { | |
| var centerX, centerY, leftX, leftY, rightX, rightY, thetaRad, topX, topY; | |
| thetaRad = percToRad(perc / 2); | |
| centerX = 0; | |
| centerY = 0; | |
| topX = centerX - this.len * Math.cos(thetaRad); | |
| topY = centerY - this.len * Math.sin(thetaRad); | |
| leftX = centerX - this.radius * Math.cos(thetaRad - Math.PI / 2); | |
| leftY = centerY - this.radius * Math.sin(thetaRad - Math.PI / 2); | |
| rightX = centerX - this.radius * Math.cos(thetaRad + Math.PI / 2); | |
| rightY = centerY - this.radius * Math.sin(thetaRad + Math.PI / 2); | |
| return "M " + leftX + " " + leftY + " L " + topX + " " + topY + " L " + rightX + " " + rightY; | |
| }; | |
| function Needle(el) { | |
| this.el = el; | |
| this.len = width / 3; | |
| this.radius = this.len / 6; | |
| } | |
| Needle.prototype.render = function(perc) { | |
| this.el.append('circle').attr('class', 'needle-center').attr('cx', 0).attr('cy', 0).attr('r', this.radius); | |
| return this.el.append('path').attr('class', 'needle').attr('d', recalcPointerPos.call(this, perc)); | |
| }; | |
| Needle.prototype.moveTo = function(perc) { | |
| var self; | |
| self = this; | |
| return this.el.transition().delay(500).ease('elastic').duration(3000).selectAll('.needle').tween('progress', function() { | |
| return function(percentOfPercent) { | |
| var progress = percentOfPercent * perc; | |
| return d3.select(this).attr('d', recalcPointerPos.call(self, progress)); | |
| }; | |
| }); | |
| }; | |
| return Needle; | |
| })(); | |
| needle = new Needle(chart); | |
| needle.render(0); | |
| needle.moveTo(percent); | |
| })(); |
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <style type="text/css"> | |
| .chart-gauge | |
| { | |
| width: 400px; | |
| margin: 100px auto | |
| } | |
| .chart-color1 | |
| { | |
| fill: steelblue; | |
| } | |
| .chart-color2 | |
| { | |
| fill: #DEA82C; | |
| } | |
| .chart-color3 | |
| { | |
| fill: #E9621A; | |
| } | |
| .chart-color4 | |
| { | |
| fill: ##e92213; | |
| } | |
| .needle, .needle-center | |
| { | |
| fill: #464A4F; | |
| } | |
| svg { | |
| font: 10px sans-serif; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <div id="foo"></div> | |
| <div class="chart-gauge"></div> | |
| <script src="http://d3js.org/d3.v3.min.js" charset="utf-8"></script> | |
| <script type="text/javascript" src="d3_gauge.js"></script> | |
| </body> | |
| </html> |
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