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Percentage Calculation

Events are signals that let you execute specific actions—such as sending data to the server, and so on—using JavaScript, in response to any interactions/updates for a chart. FusionCharts Suite XT includes advanced features that let you add more context to your chart and make data visualization simpler. These features include chart updates, percentage calculation, and events.

This article focuses on how you can calculate the percentage of a data plot with respect to all the data plots using ember-fusioncharts component.

A chart configured to calculate the percent, is shown below:

FusionCharts will load here..
{
    "chart": {
        "caption": "Countries With Most Oil Reserves [2017-18]",
        "subCaption": "In MMbbl = One Million barrels",
        "xAxisName": "Country",
        "yAxisName": "Reserves (MMbbl)",
        "numberSuffix": "K",
        "theme": "fusion"
    },
    "data": [
        {
            "label": "Venezuela",
            "value": "290"
        },
        {
            "label": "Saudi",
            "value": "260"
        },
        {
            "label": "Canada",
            "value": "180"
        },
        {
            "label": "Iran",
            "value": "140"
        },
        {
            "label": "Russia",
            "value": "115"
        },
        {
            "label": "UAE",
            "value": "100"
        },
        {
            "label": "US",
            "value": "30"
        },
        {
            "label": "China",
            "value": "30"
        }
    ]
}

Setup ember-cli-build.js

In this step we will include all the necessary files and add the dependency to create the Column 2D chart. The code is given below:

/* eslint-env node */
'use strict';

const EmberAddon = require('ember-cli/lib/broccoli/ember-addon');

module.exports = function (defaults) {
    let app = new EmberAddon(defaults, {
        // Add options here
    });

    // Import FusionCharts library
    app.import('bower_components/fusioncharts/fusioncharts.js');
    app.import('bower_components/fusioncharts/fusioncharts.charts.js');        
    app.import('bower_components/fusioncharts/themes/fusioncharts.theme.fusion.js');    

    return app.toTree();
};

In the above code, include the necessary libraries and components using import. For example, ember-fusioncharts, fusioncharts, etc.

If you need to use different assets in different environments, specify an object as the first parameter. That object's keys should be the environment name and the values should be the asset to use in that environment.

Add chart data to chart-viewer.js

Add the following code to chart-viewer.js:

import Component from '@ember/component';

var total = dataSource.data.reduce((p,c) => p + Number(c.value), 0);

export default Component.extend({    
    width: 700,
    height: 400,
    type: 'column2d',
    dataFormat: 'json',
    dataSource: {
        "chart": {
            "caption": "Countries With Most Oil Reserves [2017-18]",
            "subCaption": "In MMbbl = One Million barrels",
            "xAxisName": "Country",
            "yAxisName": "Reserves (MMbbl)",
            "numberSuffix": "K",
            "theme": "fusion"
        },
        "data": [{
            "label": "Venezuela",
            "value": "290"
        }, {
            "label": "Saudi",
            "value": "260"
        }, {
            "label": "Canada",
            "value": "180"
        }, {
            "label": "Iran",
            "value": "140"
        }, {
            "label": "Russia",
            "value": "115"
        }, {
            "label": "UAE",
            "value": "100"
        }, {
            "label": "US",
            "value": "30"
        }, {
            "label": "China",
            "value": "30"
        }]
    },    
    events: null,
    message: 'Hover on the plot to see the percentage along with the label',

    init() {
        this._super(...arguments);
        const self = this;
        this.set('events', {
            dataplotRollOver: function (eventObj, dataObj) {
                var value = (dataObj.value / total * 100).toFixed(2);
                self.set('message', dataObj.categoryLabel + ' is ' + value +'% of top 8 oil reserve countries');
            },
            dataplotRollOut: function (eventObj, dataObj) {
                self.set('message', 'Hover on the plot to see the percentage along with the label');
            }
        });
    }    
});

In the above code:

  1. Create a chart component to render the chart.

  2. Store the chart configuration in a JSON object. In the JSON object:

    • Set the chart type as column2d. Find the complete list of chart types with their respective alias here.
    • Set the width and height of the chart in pixels.
    • Set the dataFormat as JSON.
    • Embed the json data as the value of dataSource.

  3. Set the message which gets displayed with the rendering of the chart.

  4. Call the init() funtion where:

    • dataplotrollover event shows the percentage of the hovered plot.
    • dataplotrollout event resets the default message.

Add data to chart-viewer.hbs

Add the following code to chart-viewer.hbs:

{{fusioncharts-xt
    width=width
    height=height
    type=type
    dataFormat=dataFormat
    dataSource=dataSource
    events=events}}

<p>{{ message }}</p>

In the above code:

  1. Add the fusioncharts component to render the chart.

  2. Display the message using <p>.