Divergent Lines
This demo shows how an XYChart can combine several smoothed LineSeries to depict projections using divergent lines. Divergent lines refer to a set of lines that originate from a common point and gradually spread or move apart from each other as they extend further. These lines exhibit a diverging pattern, creating increasing space or distance between them.
Implementation details
We created 4 smoothed line series here: 1 for the observed value range (solid line) and 3 for the projections (dashed). As projection series start where the observed series ends, we gete a continuous looks we are after.
Related tutorials
Demo source
<!-- Styles -->
<style>
#chartdiv {
width: 100%;
height: 400px;
}
</style>
<!-- Resources -->
<script src="https://cdn.amcharts.com/lib/5/index.js"></script>
<script src="https://cdn.amcharts.com/lib/5/xy.js"></script>
<script src="https://cdn.amcharts.com/lib/5/themes/Animated.js"></script>
<!-- Chart code -->
<script>
am5.ready(function() {
// Create root element
// https://www.amcharts.com/docs/v5/getting-started/#Root_element
var root = am5.Root.new("chartdiv");
// Set themes
// https://www.amcharts.com/docs/v5/concepts/themes/
root.setThemes([
am5themes_Animated.new(root)
]);
// Create chart
// https://www.amcharts.com/docs/v5/charts/xy-chart/
var chart = root.container.children.push(am5xy.XYChart.new(root, {
panX: true,
panY: true,
wheelX: "panX",
wheelY: "zoomX",
layout: root.verticalLayout,
pinchZoomX:true
}));
chart.get("colors").set("step", 3);
// Data
var data = [{
"date": new Date(2020, 0, 1).getTime(),
"observed": 0
}, {
"date": new Date(2020, 1, 1).getTime(),
"observed": 4000
}, {
"date": new Date(2020, 2, 1).getTime(),
"observed": 55000
}, {
"date": new Date(2020, 3, 1).getTime(),
"observed": 220000
}, {
"date": new Date(2020, 4, 1).getTime(),
"observed": 390000
}, {
"date": new Date(2020, 5, 1).getTime(),
"observed": 550000
}, {
"date": new Date(2020, 6, 1).getTime(),
"observed": 720000,
"easing": 720000,
"projection": 720000,
"stricter": 720000
}, {
"date": new Date(2020, 7, 1).getTime(),
"easing": 900000,
"projection": 900000,
"stricter": 900000
}, {
"date": new Date(2020, 8, 1).getTime(),
"easing": 1053000,
"projection": 1053000,
"stricter": 1053000
}, {
"date": new Date(2020, 9, 1).getTime(),
"easing": 1252000,
"projection": 1249000,
"stricter": 1232000
}, {
"date": new Date(2020, 10, 1).getTime(),
"easing": 1674000,
"projection": 1604000,
"stricter": 1415000
}, {
"date": new Date(2020, 11, 1).getTime(),
"easing": 3212000,
"projection": 2342000,
"stricter": 1751000
}];
// Add cursor
// https://www.amcharts.com/docs/v5/charts/xy-chart/cursor/
var cursor = chart.set("cursor", am5xy.XYCursor.new(root, {}));
cursor.lineY.set("visible", false);
// Create axes
// https://www.amcharts.com/docs/v5/charts/xy-chart/axes/
var xAxis = chart.xAxes.push(am5xy.DateAxis.new(root, {
maxDeviation: 0.3,
baseInterval: {
timeUnit: "month",
count: 1
},
renderer: am5xy.AxisRendererX.new(root, {
minorGridEnabled: true,
minGridDistance: 60
}),
tooltip: am5.Tooltip.new(root, {})
}));
var yAxis = chart.yAxes.push(am5xy.ValueAxis.new(root, {
maxDeviation: 0.3,
renderer: am5xy.AxisRendererY.new(root, {})
}));
// Add series
// https://www.amcharts.com/docs/v5/charts/xy-chart/series/
function createSeries(field, name, color, dashed) {
var series = chart.series.push(am5xy.SmoothedXLineSeries.new(root, {
name: name,
xAxis: xAxis,
yAxis: yAxis,
valueYField: field,
valueXField: "date",
stroke: color,
tooltip: am5.Tooltip.new(root, {
pointerOrientation: "horizontal",
getFillFromSprite: false,
labelText: "[bold]{name}[/]\n{valueX}: [bold]{valueY}[/]"
})
}));
series.get("tooltip").get("background").setAll({
fillOpacity: 0.7,
fill: color,
pointerBaseWidth: 0
});
series.strokes.template.setAll({
strokeWidth: 2
});
if (dashed) {
series.strokes.template.set("strokeDasharray", [5, 3]);
}
series.data.setAll(data);
series.appear(1000);
return series;
}
createSeries("observed", "Observed", am5.color(0xB1B106));
createSeries("easing", "Easing rules", am5.color(0xD68C45), true);
createSeries("stricter", "Stricter rules", am5.color(0x2C6E49), true);
createSeries("projection", "Projection", am5.color(0xB1B106), true);
// Set date fields
// https://www.amcharts.com/docs/v5/concepts/data/#Parsing_dates
root.dateFormatter.setAll({
dateFormat: "yyyy-MM-dd",
dateFields: ["valueX"]
});
// Add legend
// https://www.amcharts.com/docs/v5/charts/xy-chart/legend-xy-series/
var legend = chart.children.push(
am5.Legend.new(root, {
centerX: am5.p50,
x: am5.p50
})
);
legend.data.setAll(chart.series.values);
// Make stuff animate on load
// https://www.amcharts.com/docs/v5/concepts/animations/
chart.appear(1000, 100);
}); // end am5.ready()
</script>
<!-- HTML -->
<div id="chartdiv"></div>