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Chart.js v2.0 time series line chart customization (legend, font size, labels, min/max, color, ...)
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| <!DOCTYPE html> | |
| <html lang="ja"> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.18.1/moment.min.js"></script> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.8.0/Chart.min.js"></script> | |
| <script src="https://unpkg.com/chartjs-plugin-colorschemes"></script> | |
| <title>Chart.js - Time series line chart</title> | |
| </head> | |
| <body> | |
| <canvas id="chart1"></canvas> | |
| </body> | |
| <script> | |
| function updateAxes(chart, label, t_min,t_max, y_min,y_max) { | |
| chart.options = { | |
| scales: { | |
| xAxes: [{ | |
| type: 'time', | |
| time: { | |
| min: t_min, | |
| max: t_max, | |
| displayFormats: { | |
| second: 'HH:mm:ss', | |
| minute: 'M/D HH:mm', | |
| hour: 'M/D HH:mm', | |
| day: 'M/D' | |
| } | |
| } | |
| }], | |
| yAxes: [{ | |
| scaleLabel: { | |
| display: true, | |
| fontStyle: 'bold', | |
| fontSize: 20, | |
| labelString: label | |
| }, | |
| ticks: { | |
| min: y_min, | |
| max: y_max | |
| } | |
| }] | |
| }, | |
| plugins: { | |
| colorschemes: { | |
| scheme: 'brewer.SetTwo8' | |
| } | |
| } | |
| }; | |
| chart.update(); | |
| }; | |
| function addData(chart, data, item) { | |
| if(!list.some(d => d.label == data)){ | |
| var newData = { | |
| label: data, | |
| lineTension: 0, | |
| pointStyle: `circle`, | |
| radius: 5, | |
| borderWidth: 2, | |
| fill: false, | |
| data: [] | |
| }; | |
| list.push(newData); | |
| } | |
| chart.data.datasets.forEach((d) => { | |
| if(d.label == data){ | |
| d.data.push(item); | |
| // Remove old data | |
| if(d.data[0].x < chart.options.scales.xAxes[0].time.min){ | |
| d.data.shift(); | |
| } | |
| } | |
| }); | |
| chart.update(); | |
| } | |
| // Setup chart | |
| let ctx = document.getElementById('chart1').getContext('2d'); | |
| let list = []; | |
| Chart.defaults.global.defaultFontSize = 16; | |
| var chart = new Chart(ctx, { | |
| type: 'line', | |
| data: { datasets: list }, | |
| options: { | |
| legend: { | |
| display: true, | |
| labels: { | |
| fontColor: 'rgb(64, 64, 64)' | |
| } | |
| }, | |
| } | |
| }); | |
| // Update chart data | |
| let a = 40.0; | |
| let b = 38.0; | |
| setInterval(function(){ | |
| const now = Date.now(); | |
| const old = new Date(now - (1000 * 60 * 1)); | |
| updateAxes(chart, 'Humidity (%RH)', old, now, 20,50); | |
| a += Math.random() - 0.5; | |
| b += Math.random() - 0.5; | |
| addData(chart, '80DCDD98', { x: Date.now(), y: a }); | |
| addData(chart, '2A824A09', { x: Date.now(), y: b }); | |
| addData(chart, '平均', { x: Date.now(), y: (a+b)/2 }); | |
| },3000); | |
| </script> | |
| </html> |
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