Variance indicators

A clever use of highly configurable clustered Column series and adapters allows automatically-calculated variance indicators.

by amcharts

HTML

<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>
<div id="chartdiv"></div>

CSS

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
}

#chartdiv {
  width: 100%;
  height: 350px;
}

JavaScript

/**
 * ---------------------------------------
 * This demo was created using amCharts 4.
 * 
 * For more information visit:
 * https://www.amcharts.com/
 * 
 * Documentation is available at:
 * https://www.amcharts.com/docs/v4/
 * ---------------------------------------
 */

// Themes begin
am4core.useTheme(am4themes_animated);
// Themes end

// Create chart instance
var chart = am4core.create("chartdiv", am4charts.XYChart);

// Add data
chart.data = [{
	"year": "2011",
	"value": 600000
}, {
	"year": "2012",
	"value": 900000
}, {
	"year": "2013",
	"value": 80000
}, {
	"year": "2014",
	"value": 600000
}, {
	"year": "2015",
	"value": 50000
}, {
	"year": "2016",
	"value": 600000
}, {
	"year": "2017",
	"value": 670000
}];

chart.maskBullets = false;

// Populate data
for (var i = 0; i < (chart.data.length - 1); i++) {
	chart.data[i].valueNext = chart.data[i + 1].value;
}

// Create axes
var categoryAxis = chart.xAxes.push(new am4charts.CategoryAxis());
categoryAxis.dataFields.category = "year";
categoryAxis.renderer.grid.template.location = 0;
categoryAxis.renderer.minGridDistance = 30;

var valueAxis = chart.yAxes.push(new am4charts.ValueAxis());
valueAxis.min = 0;

// Create series
var series = chart.series.push(new am4charts.ColumnSeries());
series.dataFields.valueY = "value";
series.dataFields.categoryX = "year";

// Add series for showing variance arrows
var series2 = chart.series.push(new am4charts.ColumnSeries());
series2.dataFields.valueY = "valueNext";
series2.dataFields.openValueY = "value";
series2.dataFields.categoryX = "year";
series2.columns.template.width = 1;
series2.fill = am4core.color("#555");
series2.stroke = am4core.color("#555");

// Add a triangle for arrow tip
var arrow = series2.bullets.push(new am4core.Triangle);
arrow.width = 10;
arrow.height = 10;
arrow.horizontalCenter = "middle";
arrow.verticalCenter = "top";
arrow.dy = -1;

// Set up a rotation adapter which would rotate the triangle if its a negative...