CODEWITHSUNDEEP
javascriptchartsplotly
Marko Kevac
Marko Kevac

Reputation: 2982

How do I make stacked area chart in plotly.js with correct values?

There is an example of a stacked area chart:

var stacksDiv = document.getElementById("myDiv");
var traces = [
    {x: [1,2,3], y: [2,1,4], fill: 'tozeroy'},
    {x: [1,2,3], y: [1,1,2], fill: 'tonexty'},
    {x: [1,2,3], y: [3,0,2], fill: 'tonexty'}
];
function stackedArea(traces) {
    for(var i=1; i<traces.length; i++) {
        for(var j=0; j<(Math.min(traces[i]['y'].length, traces[i-1]['y'].length)); j++) {
            traces[i]['y'][j] += traces[i-1]['y'][j];
        }
    }
    return traces;
}

Plotly.newPlot(stacksDiv, stackedArea(traces), {title: 'stacked and filled line chart'});

But stacking is done manually, so values are not correct:

enter image description here

When you mouse over the first vertical line, you see values 2, 3 and 6. But if you look in the source code, correct values are 2, 1 and 3.

Is there a way to get stacking for area charts with correct values?

Upvotes: 1

Views: 2827

Answers (1)

emackey
emackey

Reputation: 12418

The original values can be used as text labels for the hover info, prior to the values being summed for the stacked chart.

var stacksDiv = document.getElementById("myDiv");
var traces = [
    {x: [1,2,3], y: [2,1,4], fill: 'tozeroy'},
    {x: [1,2,3], y: [1,1,2], fill: 'tonexty'},
    {x: [1,2,3], y: [3,0,2], fill: 'tonexty'}
];
function stackedArea(traces) {
    var i, j;
    for(i=0; i<traces.length; i++) {
        traces[i].text = [];
        traces[i].hoverinfo = 'text';
        for(j=0; j<(traces[i]['y'].length); j++) {
            traces[i].text.push(traces[i]['y'][j].toFixed(0));
        }
    }
    for(i=1; i<traces.length; i++) {
        for(j=0; j<(Math.min(traces[i]['y'].length, traces[i-1]['y'].length)); j++) {
            traces[i]['y'][j] += traces[i-1]['y'][j];
        }
    }
    return traces;
}

Plotly.newPlot(stacksDiv, stackedArea(traces), {title: 'stacked and filled line chart'});
<script src="https://cdn.plot.ly/plotly-1.2.1.min.js"></script>
<div id="myDiv" style="width: 480px; height: 400px;"></div>

Upvotes: 3

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