let income = [0, 0, 0, 1000, 1000, 2000, 5000, 9000, 12000, 12000, 12000, 5000, 4000, 10000]
let outcome = [0, 0, 7000, 0, 7000, 7000, 7000, 12000, 9000, 9000, 9000, 5000, 5000, 5000]
//create a function to find where lines intersect, to color them correctly
function intersect(x1, x2, y1, y2, y3, y4) {
return ((x2 * y1 - x1 * y2) - (x2 * y3 - x1 * y4))/((y4 - y3) - (y2 - y1));
}
var ranges = []; //stores all the data for the graph like so [x, y1, y2]
var incomeZones = []; //stores the different zones based on where the lines intersect
var incomeBiggerBool = true; //used for keeping track of what current color is
//loop through all values in income and outcome array (assumes they are same length). Fill the ranges array and create color zones.
//Zones color up to a given point, therefore we need to push a color at the end, before it intersects
for (i = 0; i < income.length; i++) {
ranges.push([i, income[i], outcome[i]]); //push to range array
if (income[i] < outcome[i] && incomeBiggerBool) {
incomeZones.push({
value: intersect(i - 1, i, income[i - 1], income[i], outcome[i - 1], outcome[i]),
fillColor: '#C0D890', // green
}); //push to zone array
incomeBiggerBool = false;
} else if (income[i] > outcome[i] && !incomeBiggerBool) {
incomeZones.push({
value: intersect(i - 1, i, income[i - 1], income[i], outcome[i - 1], outcome[i]),
fillColor: '#ED4337' // red
}); //push to zone array
incomeBiggerBool = true;
}
}
//zones color up to a given point, therefore we need to push a color at the end as well:
if (incomeBiggerBool) {
incomeZones.push({
value: income.length,
fillColor: '#C0D890' // green
})
} else {
incomeZones.push({
value: income.length,
fillColor: '#ED4337' // red
})
}
var chart = Highcharts.stockChart('container', {
chart: {
type: 'arearange'
},
credits: {
enabled: false
},
exporting: {
enabled: false
},
rangeSelector: {
enabled: false
},
scrollbar: {
enabled: false
},
navigator: {
enabled: false
},
xAxis: {
visible: false
},
title: {
text: 'Example'
},
plotOptions: {},
tooltip: {
//Prettier tooltip:
pointFormatter: function() {
return 'Income: <b>' + this.low + '</b> - Expenditures: <b>' + this.high + '</b>'
}
},
series: [{
name: 'Income',
data: ranges,
zoneAxis: 'x',
zones: incomeZones
}]
});
<script src="https://code.jquery.com/jquery-3.1.1.min.js"></script>
<script src="https://code.highcharts.com/stock/highstock.js"></script>
<script src="https://code.highcharts.com/stock/highcharts-more.js"></script>
<script src="https://code.highcharts.com/stock/modules/exporting.js"></script>
<div id="container" style="min-width: 310px; height: 400px; margin: 0 auto"></div>