Highcharts 热点图
本章节我们将为大家介绍 Highcharts 的热点图。
我们在前面的章节已经了解了 Highcharts 配置语法。接下来让我们来看下 Highcharts 的其他配置。
热点图
chart 配置
配置 chart 的 type 为 'heatmap' 。chart.type 描述了图表类型。默认值为 "line"。
var chart = {
type: 'heatmap'
};
实例
文件名：highcharts_heat_map.htm
<html>
<head>
<title>Highcharts 教程 | 码农教程(runcodex.com)</title>
<script src="http://apps.bdimg.com/libs/jquery/2.1.4/jquery.min.js"></script>
<script src="/try/demo_source/highcharts.js"></script>
<script src="/try/demo_source/highcharts-more.js"></script>
<script src="http://code.highcharts.com/modules/heatmap.js"></script>
</head>
<body>
<div id="container" style="width: 550px; height: 400px; margin: 0 auto"></div>
<script language="JavaScript">
$(document).ready(function() {
var chart = {
type: 'heatmap',
marginTop: 40,
marginBottom: 80
};
var title = {
text: '每星期每个员工的销售量'
};
var xAxis = {
categories: ['Alexander', 'Marie', 'Maximilian', 'Sophia', 'Lukas', 'Maria', 'Leon', 'Anna', 'Tim', 'Laura']
};
var yAxis = {
categories: ['Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday'],
title: null
};
var colorAxis = {
min: 0,
minColor: '#FFFFFF',
maxColor: Highcharts.getOptions().colors[0]
};
var legend = {
align: 'right',
layout: 'vertical',
margin: 0,
verticalAlign: 'top',
y: 25,
symbolHeight: 280
};
var tooltip = {
formatter: function () {
return '<b>' + this.series.xAxis.categories[this.point.x] + '</b> sold <br><b>' +
this.point.value + '</b> items on <br><b>' + this.series.yAxis.categories[this.point.y] + '</b>';
}
};
var series= [{
name: 'Sales per employee',
borderWidth: 1,
data: [[0, 0, 10], [0, 1, 19], [0, 2, 8], [0, 3, 24], [0, 4, 67], [1, 0, 92], [1, 1, 58], [1, 2, 78], [1, 3, 117], [1, 4, 48], [2, 0, 35], [2, 1, 15], [2, 2, 123], [2, 3, 64], [2, 4, 52], [3, 0, 72], [3, 1, 132], [3, 2, 114], [3, 3, 19], [3, 4, 16], [4, 0, 38], [4, 1, 5], [4, 2, 8], [4, 3, 117], [4, 4, 115], [5, 0, 88], [5, 1, 32], [5, 2, 12], [5, 3, 6], [5, 4, 120], [6, 0, 13], [6, 1, 44], [6, 2, 88], [6, 3, 98], [6, 4, 96], [7, 0, 31], [7, 1, 1], [7, 2, 82], [7, 3, 32], [7, 4, 30], [8, 0, 85], [8, 1, 97], [8, 2, 123], [8, 3, 64], [8, 4, 84], [9, 0, 47], [9, 1, 114], [9, 2, 31], [9, 3, 48], [9, 4, 91]],
dataLabels: {
enabled: true,
color: '#000000'
}
}];
var json = {};
json.chart = chart;
json.title = title;
json.xAxis = xAxis;
json.yAxis = yAxis;
json.colorAxis = colorAxis;
json.legend = legend;
json.tooltip = tooltip;
json.series = series;
$('#container').highcharts(json);
});
</script>
</body>
</html>
以上实例输出结果为：
大数据量热点图
实例
文件名：highcharts_heat_largemap.htm（完整源码请点击实例查看）
<html>
<head>
<title>Highcharts 教程 | 码农教程(runcodex.com)</title>
<script src="http://apps.bdimg.com/libs/jquery/2.1.4/jquery.min.js"></script>
<script src="/try/demo_source/highcharts.js"></script>
<script src="http://code.highcharts.com/modules/data.js"></script>
<script src="http://code.highcharts.com/modules/heatmap.js"></script>
</head>
<body>
<div id="container" style="width: 550px; height: 400px; margin: 0 auto"></div>
<!-- 省略数据开始，详情请点击“尝试一下” -->
……
……
……
<!-- 省略数据结束，详情请点击“尝试一下” -->
<script language="JavaScript">
$(document).ready(function() {
/**
* This plugin extends Highcharts in two ways:
* - Use HTML5 canvas instead of SVG for rendering of the heatmap squares. Canvas
* outperforms SVG when it comes to thousands of single shapes.
* - Add a K-D-tree to find the nearest point on mouse move. Since we no longer have SVG shapes
* to capture mouseovers, we need another way of detecting hover points for the tooltip.
*/
(function (H) {
var wrap = H.wrap,
seriesTypes = H.seriesTypes;
/**
* Get the canvas context for a series
*/
H.Series.prototype.getContext = function () {
var canvas;
if (!this.ctx) {
canvas = document.createElement('canvas');
canvas.setAttribute('width', this.chart.plotWidth);
canvas.setAttribute('height', this.chart.plotHeight);
canvas.style.position = 'absolute';
canvas.style.left = this.group.translateX + 'px';
canvas.style.top = this.group.translateY + 'px';
canvas.style.zIndex = 0;
canvas.style.cursor = 'crosshair';
this.chart.container.appendChild(canvas);
if (canvas.getContext) {
this.ctx = canvas.getContext('2d');
}
}
return this.ctx;
}
/**
* Wrap the drawPoints method to draw the points in canvas instead of the slower SVG,
* that requires one shape each point.
*/
H.wrap(H.seriesTypes.heatmap.prototype, 'drawPoints', function (proceed) {
var ctx;
if (this.chart.renderer.forExport) {
// Run SVG shapes
proceed.call(this);
} else {
if (ctx = this.getContext()) {
// draw the columns
H.each(this.points, function (point) {
var plotY = point.plotY,
shapeArgs;
if (plotY !== undefined && !isNaN(plotY) && point.y !== null) {
shapeArgs = point.shapeArgs;
ctx.fillStyle = point.pointAttr[''].fill;
ctx.fillRect(shapeArgs.x, shapeArgs.y, shapeArgs.width, shapeArgs.height);
}
});
} else {
this.chart.showLoading("Your browser doesn't support HTML5 canvas, <br>please use a modern browser");
// Uncomment this to provide low-level (slow) support in oldIE. It will cause script errors on
// charts with more than a few thousand points.
//proceed.call(this);
}
}
});
}(Highcharts));
var data = {
csv: document.getElementById('csv').innerHTML,
parsed: function () {
start = +new Date();
}
};
var chart = {
type: 'heatmap',
margin: [60, 10, 80, 50]
};
var title = {
text: 'Highcharts extended heat map',
align: 'left',
x: 40
};
var subtitle = {
text: 'Temperature variation by day and hour through 2013',
align: 'left',
x: 40
};
var xAxis = {
type: 'datetime',
min: Date.UTC(2013, 0, 1),
max: Date.UTC(2014, 0, 1),
labels: {
align: 'left',
x: 5,
y: 14,
format: '{value:%B}' // long month
},
showLastLabel: false,
tickLength: 16
};
var yAxis = {
title: {
text: null
},
labels: {
format: '{value}:00'
},
minPadding: 0,
maxPadding: 0,
startOnTick: false,
endOnTick: false,
tickPositions: [0, 6, 12, 18, 24],
tickWidth: 1,
min: 0,
max: 23,
reversed: true
};
var colorAxis = {
stops: [
[0, '#3060cf'],
[0.5, '#fffbbc'],
[0.9, '#c4463a'],
[1, '#c4463a']
],
min: -15,
max: 25,
startOnTick: false,
endOnTick: false,
labels: {
format: '{value}?'
}
};
var series= [{
borderWidth: 0,
nullColor: '#EFEFEF',
colsize: 24 * 36e5, // one day
tooltip: {
headerFormat: 'Temperature<br/>',
pointFormat: '{point.x:%e %b, %Y} {point.y}:00: <b>{point.value} ?</b>'
},
turboThreshold: Number.MAX_VALUE // #3404, remove after 4.0.5 release
}];
var json = {};
json.chart = chart;
json.data = data;
json.title = title;
json.xAxis = xAxis;
json.yAxis = yAxis;
json.colorAxis = colorAxis;
json.series = series;
$('#container').highcharts(json);
});
</script>
</body>
</html>
以上实例输出结果为：
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