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D3 Gauge Chart
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <title>D3 Gauge Chart</title> | |
| <style type="text/css"> | |
| svg { | |
| display: block; | |
| border: 1px solid #000; | |
| width: 500px; height: 350px; | |
| background-color: #0C2030; | |
| } | |
| .axis text { | |
| font-size: 14px; | |
| fill: #f1f1f1; | |
| } | |
| .axis .domain, .axis .tick line { | |
| stroke-width: 2px; | |
| stroke: #157FFB; | |
| } | |
| .label{ | |
| fill: #fff; | |
| stroke: #f00; | |
| stroke-width: 1px; | |
| font-size: 24px; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/5.5.0/d3.js"></script> | |
| <script src="https://unpkg.com/d3-radial-axis@1.5/dist/d3-radial-axis.min.js"></script> | |
| <script> | |
| function deg2rad(deg) { return deg * Math.PI / 180; } | |
| var r = 130, | |
| exAngle = 55, | |
| whRatio = 2 / (Math.sin(deg2rad(exAngle)) + 1.1), | |
| angleScale = d3.scaleLinear() | |
| .domain([0, 100]) | |
| .range([(90 + exAngle) * -1, 90 + exAngle]); | |
| var svg = d3.select('body').append('svg') | |
| .attr('viewBox', -r*0.9 + " " + -r*1.11 + " " + r*2 + " " + r*2*whRatio); | |
| var axis = d3.axisRadialInner( angleScale.copy().range(angleScale.range().map( d => deg2rad(d) )), r).tickPadding(15); | |
| // 軸線 | |
| svg.append('g').classed('axis', true) | |
| .call(axis); | |
| // 指針 | |
| var pointer = svg.append('g') | |
| .attr('transform', 'scale('+ r * 0.85 + ')') | |
| .append('path') | |
| .attr('fill', 'red') | |
| .attr('d', ['M0 -1', 'L0.03 0', 'A 0.03 0.03 0 0 1 -0.03 0', 'Z'].join(' ')) | |
| .attr('transform', `rotate(${angleScale(0)})`) | |
| // 目前數值 | |
| var label = svg.append('text') | |
| .classed('label', true) | |
| .attr('x', 0) | |
| .attr('y', r * 0.6) | |
| .attr('text-anchor', 'middle') | |
| .text('0'); | |
| setInterval(() => { | |
| var newVal = Math.round(Math.random() * 100); | |
| label.transition() | |
| .duration(800) | |
| .attrTween("d", function() { | |
| var v = label.text(); | |
| return function (n) { | |
| var i = d3.interpolateNumber( +v, +newVal); | |
| label.text( parseInt( i(n) ) ); | |
| }; | |
| }); | |
| pointer.transition() | |
| .duration(1200) | |
| .ease(d3.easeElastic) | |
| .attr('transform', `rotate(${angleScale(newVal)})`); | |
| }, 3300); | |
| </script> | |
| </body> | |
| </html> |
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