Heat map with Legend
Heat map (also known as Heatmap, Heat table, Shading matrix) represents data in a rectangular matrix where individual values are differentiated by color.
Heat rules
Heat rules allow modifying element’s properties based on its related value in data, like for instance, color of the columns on this charts.
Heat legend
A perfect companion for any color-based heat maps, a head legend can show the spectrum of values and their relation to colors.
Furthermore, utilizing chart events, it’s possible to further enhance UX by showing exact position of hovered element in the whole spectrum.
Demo source
<!-- Styles -->
<style>
#chartdiv {
width: 100%;
height: 500px;
}
</style>
<!-- Resources -->
<script src="https://cdn.amcharts.com/lib/4/core.js"></script>
<script src="https://cdn.amcharts.com/lib/4/charts.js"></script>
<script src="https://cdn.amcharts.com/lib/4/themes/animated.js"></script>
<!-- Chart code -->
<script>
am4core.ready(function() {
// Themes begin
am4core.useTheme(am4themes_animated);
// Themes end
var chart = am4core.create("chartdiv", am4charts.XYChart);
chart.maskBullets = false;
var xAxis = chart.xAxes.push(new am4charts.CategoryAxis());
var yAxis = chart.yAxes.push(new am4charts.CategoryAxis());
xAxis.dataFields.category = "weekday";
yAxis.dataFields.category = "hour";
xAxis.renderer.grid.template.disabled = true;
xAxis.renderer.minGridDistance = 40;
yAxis.renderer.grid.template.disabled = true;
yAxis.renderer.inversed = true;
yAxis.renderer.minGridDistance = 30;
var series = chart.series.push(new am4charts.ColumnSeries());
series.dataFields.categoryX = "weekday";
series.dataFields.categoryY = "hour";
series.dataFields.value = "value";
series.sequencedInterpolation = true;
series.defaultState.transitionDuration = 3000;
var bgColor = new am4core.InterfaceColorSet().getFor("background");
var columnTemplate = series.columns.template;
columnTemplate.strokeWidth = 1;
columnTemplate.strokeOpacity = 0.2;
columnTemplate.stroke = bgColor;
columnTemplate.tooltipText = "{weekday}, {hour}: {value.workingValue.formatNumber('#.')}";
columnTemplate.width = am4core.percent(100);
columnTemplate.height = am4core.percent(100);
series.heatRules.push({
target: columnTemplate,
property: "fill",
min: am4core.color(bgColor),
max: chart.colors.getIndex(0)
});
// heat legend
var heatLegend = chart.bottomAxesContainer.createChild(am4charts.HeatLegend);
heatLegend.width = am4core.percent(100);
heatLegend.series = series;
heatLegend.valueAxis.renderer.labels.template.fontSize = 9;
heatLegend.valueAxis.renderer.minGridDistance = 30;
// heat legend behavior
series.columns.template.events.on("over", function(event) {
handleHover(event.target);
})
series.columns.template.events.on("hit", function(event) {
handleHover(event.target);
})
function handleHover(column) {
if (!isNaN(column.dataItem.value)) {
heatLegend.valueAxis.showTooltipAt(column.dataItem.value)
}
else {
heatLegend.valueAxis.hideTooltip();
}
}
series.columns.template.events.on("out", function(event) {
heatLegend.valueAxis.hideTooltip();
})
chart.data = [
{
"hour": "12pm",
"weekday": "Sun",
"value": 2990
},
{
"hour": "1am",
"weekday": "Sun",
"value": 2520
},
{
"hour": "2am",
"weekday": "Sun",
"value": 2334
},
{
"hour": "3am",
"weekday": "Sun",
"value": 2230
},
{
"hour": "4am",
"weekday": "Sun",
"value": 2325
},
{
"hour": "5am",
"weekday": "Sun",
"value": 2019
},
{
"hour": "6am",
"weekday": "Sun",
"value": 2128
},
{
"hour": "7am",
"weekday": "Sun",
"value": 2246
},
{
"hour": "8am",
"weekday": "Sun",
"value": 2421
},
{
"hour": "9am",
"weekday": "Sun",
"value": 2788
},
{
"hour": "10am",
"weekday": "Sun",
"value": 2959
},
{
"hour": "11am",
"weekday": "Sun",
"value": 3018
},
{
"hour": "12am",
"weekday": "Sun",
"value": 3154
},
{
"hour": "1pm",
"weekday": "Sun",
"value": 3172
},
{
"hour": "2pm",
"weekday": "Sun",
"value": 3368
},
{
"hour": "3pm",
"weekday": "Sun",
"value": 3464
},
{
"hour": "4pm",
"weekday": "Sun",
"value": 3746
},
{
"hour": "5pm",
"weekday": "Sun",
"value": 3656
},
{
"hour": "6pm",
"weekday": "Sun",
"value": 3336
},
{
"hour": "7pm",
"weekday": "Sun",
"value": 3292
},
{
"hour": "8pm",
"weekday": "Sun",
"value": 3269
},
{
"hour": "9pm",
"weekday": "Sun",
"value": 3300
},
{
"hour": "10pm",
"weekday": "Sun",
"value": 3403
},
{
"hour": "11pm",
"weekday": "Sun",
"value": 3323
},
{
"hour": "12pm",
"weekday": "Mon",
"value": 3346
},
{
"hour": "1am",
"weekday": "Mon",
"value": 2725
},
{
"hour": "2am",
"weekday": "Mon",
"value": 3052
},
{
"hour": "3am",
"weekday": "Mon",
"value": 3876
},
{
"hour": "4am",
"weekday": "Mon",
"value": 4453
},
{
"hour": "5am",
"weekday": "Mon",
"value": 3972
},
{
"hour": "6am",
"weekday": "Mon",
"value": 4644
},
{
"hour": "7am",
"weekday": "Mon",
"value": 5715
},
{
"hour": "8am",
"weekday": "Mon",
"value": 7080
},
{
"hour": "9am",
"weekday": "Mon",
"value": 8022
},
{
"hour": "10am",
"weekday": "Mon",
"value": 8446
},
{
"hour": "11am",
"weekday": "Mon",
"value": 9313
},
{
"hour": "12am",
"weekday": "Mon",
"value": 9011
},
{
"hour": "1pm",
"weekday": "Mon",
"value": 8508
},
{
"hour": "2pm",
"weekday": "Mon",
"value": 8515
},
{
"hour": "3pm",
"weekday": "Mon",
"value": 8399
},
{
"hour": "4pm",
"weekday": "Mon",
"value": 8649
},
{
"hour": "5pm",
"weekday": "Mon",
"value": 7869
},
{
"hour": "6pm",
"weekday": "Mon",
"value": 6933
},
{
"hour": "7pm",
"weekday": "Mon",
"value": 5969
},
{
"hour": "8pm",
"weekday": "Mon",
"value": 5552
},
{
"hour": "9pm",
"weekday": "Mon",
"value": 5434
},
{
"hour": "10pm",
"weekday": "Mon",
"value": 5070
},
{
"hour": "11pm",
"weekday": "Mon",
"value": 4851
},
{
"hour": "12pm",
"weekday": "Tue",
"value": 4468
},
{
"hour": "1am",
"weekday": "Tue",
"value": 3306
},
{
"hour": "2am",
"weekday": "Tue",
"value": 3906
},
{
"hour": "3am",
"weekday": "Tue",
"value": 4413
},
{
"hour": "4am",
"weekday": "Tue",
"value": 4726
},
{
"hour": "5am",
"weekday": "Tue",
"value": 4584
},
{
"hour": "6am",
"weekday": "Tue",
"value": 5717
},
{
"hour": "7am",
"weekday": "Tue",
"value": 6504
},
{
"hour": "8am",
"weekday": "Tue",
"value": 8104
},
{
"hour": "9am",
"weekday": "Tue",
"value": 8813
},
{
"hour": "10am",
"weekday": "Tue",
"value": 9278
},
{
"hour": "11am",
"weekday": "Tue",
"value": 10425
},
{
"hour": "12am",
"weekday": "Tue",
"value": 10137
},
{
"hour": "1pm",
"weekday": "Tue",
"value": 9290
},
{
"hour": "2pm",
"weekday": "Tue",
"value": 9255
},
{
"hour": "3pm",
"weekday": "Tue",
"value": 9614
},
{
"hour": "4pm",
"weekday": "Tue",
"value": 9713
},
{
"hour": "5pm",
"weekday": "Tue",
"value": 9667
},
{
"hour": "6pm",
"weekday": "Tue",
"value": 8774
},
{
"hour": "7pm",
"weekday": "Tue",
"value": 8649
},
{
"hour": "8pm",
"weekday": "Tue",
"value": 9937
},
{
"hour": "9pm",
"weekday": "Tue",
"value": 10286
},
{
"hour": "10pm",
"weekday": "Tue",
"value": 9175
},
{
"hour": "11pm",
"weekday": "Tue",
"value": 8581
},
{
"hour": "12pm",
"weekday": "Wed",
"value": 8145
},
{
"hour": "1am",
"weekday": "Wed",
"value": 7177
},
{
"hour": "2am",
"weekday": "Wed",
"value": 5657
},
{
"hour": "3am",
"weekday": "Wed",
"value": 6802
},
{
"hour": "4am",
"weekday": "Wed",
"value": 8159
},
{
"hour": "5am",
"weekday": "Wed",
"value": 8449
},
{
"hour": "6am",
"weekday": "Wed",
"value": 9453
},
{
"hour": "7am",
"weekday": "Wed",
"value": 9947
},
{
"hour": "8am",
"weekday": "Wed",
"value": 11471
},
{
"hour": "9am",
"weekday": "Wed",
"value": 12492
},
{
"hour": "10am",
"weekday": "Wed",
"value": 9388
},
{
"hour": "11am",
"weekday": "Wed",
"value": 9928
},
{
"hour": "12am",
"weekday": "Wed",
"value": 9644
},
{
"hour": "1pm",
"weekday": "Wed",
"value": 9034
},
{
"hour": "2pm",
"weekday": "Wed",
"value": 8964
},
{
"hour": "3pm",
"weekday": "Wed",
"value": 9069
},
{
"hour": "4pm",
"weekday": "Wed",
"value": 8898
},
{
"hour": "5pm",
"weekday": "Wed",
"value": 8322
},
{
"hour": "6pm",
"weekday": "Wed",
"value": 6909
},
{
"hour": "7pm",
"weekday": "Wed",
"value": 5810
},
{
"hour": "8pm",
"weekday": "Wed",
"value": 5151
},
{
"hour": "9pm",
"weekday": "Wed",
"value": 4911
},
{
"hour": "10pm",
"weekday": "Wed",
"value": 4487
},
{
"hour": "11pm",
"weekday": "Wed",
"value": 4118
},
{
"hour": "12pm",
"weekday": "Thu",
"value": 3689
},
{
"hour": "1am",
"weekday": "Thu",
"value": 3081
},
{
"hour": "2am",
"weekday": "Thu",
"value": 6525
},
{
"hour": "3am",
"weekday": "Thu",
"value": 6228
},
{
"hour": "4am",
"weekday": "Thu",
"value": 6917
},
{
"hour": "5am",
"weekday": "Thu",
"value": 6568
},
{
"hour": "6am",
"weekday": "Thu",
"value": 6405
},
{
"hour": "7am",
"weekday": "Thu",
"value": 8106
},
{
"hour": "8am",
"weekday": "Thu",
"value": 8542
},
{
"hour": "9am",
"weekday": "Thu",
"value": 8501
},
{
"hour": "10am",
"weekday": "Thu",
"value": 8802
},
{
"hour": "11am",
"weekday": "Thu",
"value": 9420
},
{
"hour": "12am",
"weekday": "Thu",
"value": 8966
},
{
"hour": "1pm",
"weekday": "Thu",
"value": 8135
},
{
"hour": "2pm",
"weekday": "Thu",
"value": 8224
},
{
"hour": "3pm",
"weekday": "Thu",
"value": 8387
},
{
"hour": "4pm",
"weekday": "Thu",
"value": 8218
},
{
"hour": "5pm",
"weekday": "Thu",
"value": 7641
},
{
"hour": "6pm",
"weekday": "Thu",
"value": 6469
},
{
"hour": "7pm",
"weekday": "Thu",
"value": 5441
},
{
"hour": "8pm",
"weekday": "Thu",
"value": 4952
},
{
"hour": "9pm",
"weekday": "Thu",
"value": 4643
},
{
"hour": "10pm",
"weekday": "Thu",
"value": 4393
},
{
"hour": "11pm",
"weekday": "Thu",
"value": 4017
},
{
"hour": "12pm",
"weekday": "Fri",
"value": 4022
},
{
"hour": "1am",
"weekday": "Fri",
"value": 3063
},
{
"hour": "2am",
"weekday": "Fri",
"value": 3638
},
{
"hour": "3am",
"weekday": "Fri",
"value": 3968
},
{
"hour": "4am",
"weekday": "Fri",
"value": 4070
},
{
"hour": "5am",
"weekday": "Fri",
"value": 4019
},
{
"hour": "6am",
"weekday": "Fri",
"value": 4548
},
{
"hour": "7am",
"weekday": "Fri",
"value": 5465
},
{
"hour": "8am",
"weekday": "Fri",
"value": 6909
},
{
"hour": "9am",
"weekday": "Fri",
"value": 7706
},
{
"hour": "10am",
"weekday": "Fri",
"value": 7867
},
{
"hour": "11am",
"weekday": "Fri",
"value": 8615
},
{
"hour": "12am",
"weekday": "Fri",
"value": 8218
},
{
"hour": "1pm",
"weekday": "Fri",
"value": 7604
},
{
"hour": "2pm",
"weekday": "Fri",
"value": 7429
},
{
"hour": "3pm",
"weekday": "Fri",
"value": 7488
},
{
"hour": "4pm",
"weekday": "Fri",
"value": 7493
},
{
"hour": "5pm",
"weekday": "Fri",
"value": 6998
},
{
"hour": "6pm",
"weekday": "Fri",
"value": 5941
},
{
"hour": "7pm",
"weekday": "Fri",
"value": 5068
},
{
"hour": "8pm",
"weekday": "Fri",
"value": 4636
},
{
"hour": "9pm",
"weekday": "Fri",
"value": 4241
},
{
"hour": "10pm",
"weekday": "Fri",
"value": 3858
},
{
"hour": "11pm",
"weekday": "Fri",
"value": 3833
},
{
"hour": "12pm",
"weekday": "Sat",
"value": 3503
},
{
"hour": "1am",
"weekday": "Sat",
"value": 2842
},
{
"hour": "2am",
"weekday": "Sat",
"value": 2808
},
{
"hour": "3am",
"weekday": "Sat",
"value": 2399
},
{
"hour": "4am",
"weekday": "Sat",
"value": 2280
},
{
"hour": "5am",
"weekday": "Sat",
"value": 2139
},
{
"hour": "6am",
"weekday": "Sat",
"value": 2527
},
{
"hour": "7am",
"weekday": "Sat",
"value": 2940
},
{
"hour": "8am",
"weekday": "Sat",
"value": 3066
},
{
"hour": "9am",
"weekday": "Sat",
"value": 3494
},
{
"hour": "10am",
"weekday": "Sat",
"value": 3287
},
{
"hour": "11am",
"weekday": "Sat",
"value": 3416
},
{
"hour": "12am",
"weekday": "Sat",
"value": 3432
},
{
"hour": "1pm",
"weekday": "Sat",
"value": 3523
},
{
"hour": "2pm",
"weekday": "Sat",
"value": 3542
},
{
"hour": "3pm",
"weekday": "Sat",
"value": 3347
},
{
"hour": "4pm",
"weekday": "Sat",
"value": 3292
},
{
"hour": "5pm",
"weekday": "Sat",
"value": 3416
},
{
"hour": "6pm",
"weekday": "Sat",
"value": 3131
},
{
"hour": "7pm",
"weekday": "Sat",
"value": 3057
},
{
"hour": "8pm",
"weekday": "Sat",
"value": 3227
},
{
"hour": "9pm",
"weekday": "Sat",
"value": 3060
},
{
"hour": "10pm",
"weekday": "Sat",
"value": 2855
},
{
"hour": "11pm",
"weekday": "Sat",
"value": 2625
}
];
}); // end am4core.ready()
</script>
<!-- HTML -->
<div id="chartdiv"></div>