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June 26, 2020 13:02
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| <!doctype html> | |
| <head> | |
| <title>Chart.JS zoom test</title> | |
| <script src="https://cdn.jsdelivr.net/npm/chart.js@2.9.3"></script> | |
| <script src="https://cdn.jsdelivr.net/npm/hammerjs@2.0.8"></script> | |
| <script src="https://cdn.jsdelivr.net/npm/chartjs-plugin-zoom@0.7.7"></script> | |
| </head> | |
| <body> | |
| <input type="number" id="last_ticks" name="last_ticks" min="1" value="1"/> | |
| <div style="width:75%;"> | |
| <canvas id="myChart"></canvas> | |
| </div> | |
| <script> | |
| function numberRoundDecimal(v, n) { | |
| return Math.round((v + Number.EPSILON) * Math.pow(10, n)) / Math.pow(10, n) | |
| } | |
| Chart.defaults.LineWithLine = Chart.defaults.line; | |
| Chart.controllers.LineWithLine = Chart.controllers.line.extend({ | |
| draw: function(ease) { | |
| Chart.controllers.line.prototype.draw.call(this, ease); | |
| if (this.chart.tooltip._active && this.chart.tooltip._active.length) { | |
| var activePoint = this.chart.tooltip._active[0], | |
| ctx = this.chart.ctx, | |
| prev_ticks = document.getElementById("last_ticks").value || 1, | |
| widthChart = this.chart.scales['x-axis-0'].right - this.chart.scales['x-axis-0'].left, | |
| pieces = this.chart.config.data.labels.length - 1, | |
| widthPiece = widthChart / pieces, | |
| x = activePoint.tooltipPosition().x, | |
| topY = this.chart.scales['y-axis-1'].top, | |
| bottomY = this.chart.scales['y-axis-1'].bottom; | |
| if(x - widthPiece * prev_ticks < this.chart.scales['x-axis-0'].left) { | |
| x = this.chart.scales['x-axis-0'].left; | |
| } | |
| else { | |
| x -= widthPiece * prev_ticks; | |
| } | |
| // draw line | |
| ctx.save(); | |
| ctx.beginPath(); | |
| ctx.moveTo(x, topY); | |
| ctx.lineTo(x, bottomY); | |
| ctx.lineWidth = 2; | |
| ctx.strokeStyle = '#07C'; | |
| ctx.stroke(); | |
| ctx.restore(); | |
| } | |
| } | |
| }); | |
| var ctx = document.getElementById('myChart').getContext('2d'); | |
| var chart = new Chart(ctx, { | |
| // The type of chart we want to create | |
| // type: 'line', | |
| type: 'LineWithLine', | |
| // The data for our dataset | |
| data: { | |
| labels: [1591394407, 1591398007, 1591401606, 1591405207, 1591408806, 1591412406, 1591416006,1591394407, 1591398007, 1591401606, 1591405207, 1591408806, 1591412406, 1591416006,1591394407, 1591398007, 1591401606, 1591405207, 1591408806, 1591412406, 1591416006,1591394407, 1591398007, 1591401606, 1591405207, 1591408806, 1591412406, 1591416006,1591394407, 1591398007, 1591401606, 1591405207, 1591408806, 1591412406, 1591416006,1591394407, 1591398007, 1591401606, 1591405207, 1591408806, 1591412406, 1591416006], | |
| datasets: [{ | |
| label: 'Set-1', | |
| backgroundColor: 'rgb(255, 99, 132)', | |
| borderColor: 'rgb(255, 99, 132)', | |
| fill: false, | |
| data: [0, 10, 5, 2, 20, 30, 45,0, 10, 5, 2, 20, 30, 45,0, 10, 5, 2, 20, 30, 45,0, 10, 5, 2, 20, 30, 45,0, 10, 5, 2, 20, 30, 45,0, 10, 5, 2, 20, 30, 45], | |
| yAxisID: 'y-axis-1' | |
| }, | |
| { | |
| label: 'Set-2', | |
| backgroundColor: 'rgb(122, 0, 132)', | |
| borderColor: 'rgb(122, 0, 132)', | |
| fill: false, | |
| data: [100, 105, 102, 120, 130, 145, 110,100, 105, 102, 120, 130, 145, 110,100, 105, 102, 120, 130, 145, 110,100, 105, 102, 120, 130, 145, 110,100, 105, 102, 120, 130, 145, 110,100, 105, 102, 120, 130, 145, 110], | |
| yAxisID: 'y-axis-2' | |
| }, | |
| { | |
| label: 'Set-3', | |
| backgroundColor: 'rgb(255, 99, 0)', | |
| borderColor: 'rgb(255, 99, 0)', | |
| fill: false, | |
| data: [1002, 10020, 10030, 10045, 1000, 1010, 1005,1002, 10020, 10030, 10045, 1000, 1010, 1005,1002, 10020, 10030, 10045, 1000, 1010, 1005,1002, 10020, 10030, 10045, 1000, 1010, 1005,1002, 10020, 10030, 10045, 1000, 1010, 1005,1002, 10020, 10030, 10045, 1000, 1010, 1005], | |
| yAxisID: 'y-axis-3' | |
| }] | |
| }, | |
| // Configuration options go here | |
| options: { | |
| responsive: true, | |
| tooltips: { | |
| axis: 'x', | |
| mode: 'index', | |
| intersect: false, | |
| callbacks: { | |
| title: function(tooltipItem, data) { | |
| var title = data.labels[tooltipItem[0].index] || ''; | |
| if (title) { | |
| title = new Date(title * 1000).toLocaleString("en"); | |
| } | |
| return title; | |
| }, | |
| label: function(tooltipItem, data) { | |
| var label = data.datasets[tooltipItem.datasetIndex].data[tooltipItem.index]; | |
| var prev; | |
| var prev_ticks = document.getElementById("last_ticks").value || 1; | |
| if(tooltipItem.index - prev_ticks < 0){ | |
| prev = data.datasets[tooltipItem.datasetIndex].data[0]; | |
| } | |
| else { | |
| prev = data.datasets[tooltipItem.datasetIndex].data[tooltipItem.index-prev_ticks]; | |
| } | |
| percentage = numberRoundDecimal(label*100/prev-100, 3); | |
| label += ` (${ percentage }%)`; | |
| return label; | |
| }, | |
| labelTextColor: function(tooltipItem, chart) { | |
| var label = chart.config.data.datasets[tooltipItem.datasetIndex].data[tooltipItem.index]; | |
| var prev; | |
| var prev_ticks = document.getElementById("last_ticks").value || 1; | |
| if(tooltipItem.index - prev_ticks < 0){ | |
| prev = chart.config.data.datasets[tooltipItem.datasetIndex].data[0]; | |
| } | |
| else { | |
| prev = chart.config.data.datasets[tooltipItem.datasetIndex].data[tooltipItem.index-prev_ticks]; | |
| } | |
| if(prev < label){ | |
| return "green"; | |
| } | |
| if(prev > label){ | |
| return "red"; | |
| } | |
| return "white"; | |
| } | |
| } | |
| }, | |
| hover: { | |
| mode: 'nearest', | |
| intersect: true | |
| }, | |
| stacked: true, | |
| title: { | |
| display: false, | |
| text: 'Chart.js Line Chart - Multi Axis' | |
| }, | |
| scales: { | |
| xAxes: [{ | |
| display: true, | |
| ticks: { | |
| callback: function(value, index, values) { | |
| return new Date(value * 1000).toLocaleString("en"); | |
| } | |
| } | |
| }], | |
| yAxes: [{ | |
| type: 'linear', // only linear but allow scale type registration. This allows extensions to exist solely for log scale for instance | |
| display: true, | |
| position: 'left', | |
| id: 'y-axis-1', | |
| ticks: { | |
| min: 0.01 | |
| } | |
| }, { | |
| type: 'linear', // only linear but allow scale type registration. This allows extensions to exist solely for log scale for instance | |
| display: true, | |
| position: 'left', | |
| id: 'y-axis-2', | |
| // grid line settings | |
| gridLines: { | |
| drawOnChartArea: false, // only want the grid lines for one axis to show up | |
| }, | |
| }, { | |
| type: 'linear', // only linear but allow scale type registration. This allows extensions to exist solely for log scale for instance | |
| display: true, | |
| position: 'right', | |
| id: 'y-axis-3', | |
| // grid line settings | |
| gridLines: { | |
| drawOnChartArea: false, // only want the grid lines for one axis to show up | |
| }, | |
| }], | |
| }, | |
| plugins: { | |
| zoom: { | |
| // Container for pan options | |
| pan: { | |
| // Boolean to enable panning | |
| enabled: false, | |
| // Panning directions. Remove the appropriate direction to disable | |
| // Eg. 'y' would only allow panning in the y direction | |
| // A function that is called as the user is panning and returns the | |
| // available directions can also be used: | |
| // mode: function({ chart }) { | |
| // return 'xy'; | |
| // }, | |
| mode: 'x', | |
| // rangeMin: { | |
| // // Format of min pan range depends on scale type | |
| // // x: null, | |
| // // y: null | |
| // }, | |
| // rangeMax: { | |
| // // Format of max pan range depends on scale type | |
| // // x: null, | |
| // // y: null | |
| // }, | |
| // On category scale, factor of pan velocity | |
| speed: 20, | |
| // Minimal pan distance required before actually applying pan | |
| threshold: 100, | |
| // Function called while the user is panning | |
| onPan: function({chart}) { console.log(`I'm panning!!!`); }, | |
| // Function called once panning is completed | |
| onPanComplete: function({chart}) { console.log(`I was panned!!!`); } | |
| }, | |
| // Container for zoom options | |
| zoom: { | |
| // Boolean to enable zooming | |
| enabled: true, | |
| // Enable drag-to-zoom behavior | |
| drag: true, | |
| // Drag-to-zoom effect can be customized | |
| // drag: { | |
| // borderColor: 'rgba(225,225,225,0.3)' | |
| // borderWidth: 5, | |
| // backgroundColor: 'rgb(225,225,225)', | |
| // animationDuration: 0 | |
| // }, | |
| // Zooming directions. Remove the appropriate direction to disable | |
| // Eg. 'y' would only allow zooming in the y direction | |
| // A function that is called as the user is zooming and returns the | |
| // available directions can also be used: | |
| // mode: function({ chart }) { | |
| // return 'xy'; | |
| // }, | |
| mode: 'x', | |
| rangeMin: { | |
| // Format of min zoom range depends on scale type | |
| // x: null, | |
| // y: null | |
| }, | |
| rangeMax: { | |
| // Format of max zoom range depends on scale type | |
| // x: null, | |
| // y: null | |
| }, | |
| // Speed of zoom via mouse wheel | |
| // (percentage of zoom on a wheel event) | |
| speed: 1, | |
| // Minimal zoom distance required before actually applying zoom | |
| threshold: 2, | |
| // On category scale, minimal zoom level before actually applying zoom | |
| // sensitivity: 3, | |
| // Function called while the user is zooming | |
| onZoom: function({chart}) { console.log(`I'm zooming!!!`); }, | |
| // Function called once zooming is completed | |
| onZoomComplete: function({chart}) { console.log(`I was zoomed!!!`); } | |
| } | |
| } | |
| } | |
| } | |
| }); | |
| </script> | |
| </body> |
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