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|
*/
(function (H) {
var Series = H.Series,
each = H.each;
/**
* Create a hidden canvas to draw the graph on. The contents is later copied over
* to an SVG image element.
*/
Series.prototype.getContext = function () {
if (!this.canvas) {
this.canvas = document.createElement('canvas');
this.canvas.setAttribute('width', this.chart.chartWidth);
this.canvas.setAttribute('height', this.chart.chartHeight);
this.image = this.chart.renderer.image('', 0, 0, this.chart.chartWidth, this.chart.chartHeight).add(this.group);
this.ctx = this.canvas.getContext('2d');
}
return this.ctx;
};
/**
* Draw the canvas image inside an SVG image
*/
Series.prototype.canvasToSVG = function () {
this.image.attr({ href: this.canvas.toDataURL('image/png') });
};
/**
* 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 () {
var ctx = this.getContext();
if (ctx) {
// draw the columns
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);
}
});
this.canvasToSVG();
} 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.
// arguments[0].call(this);
}
});
H.seriesTypes.heatmap.prototype.directTouch = false; // Use k-d-tree
}(Highcharts));
var start;
$('#container').highcharts({
data: {
csv: document.getElementById('csv').innerHTML,
parsed: function () {
start = +new Date();
}
},
chart: {
type: 'heatmap',
margin: [60, 10, 80, 50]
},
title: {
text: 'Highcharts extended heat map',
align: 'left',
x: 40
},
subtitle: {
text: 'Temperature variation by day and hour through 2013',
align: 'left',
x: 40
},
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
},
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
},
colorAxis: {
stops: [
[0, '#3060cf'],
[0.5, '#fffbbc'],
[0.9, '#c4463a'],
[1, '#c4463a']
],
min: -15,
max: 25,
startOnTick: false,
endOnTick: false,
labels: {
format: '{value}℃'
}
},
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
}]
});
console.log('Rendered in ' + (new Date() - start) + ' ms'); // eslint-disable-line no-console
}); |
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