Add Annotations

Annotations are graphical elements (different types of shapes, custom text, and so on) that you can render on your chart to make it more informative, while making it visually appealing.

In this article we'll create a Spline chart and add annotations using ember-fusioncharts component. A spline chart using annotations to highlight a particular anchor along with text is shown below:

FusionCharts will load here..
{ "chart": { "caption": "Average Monthly Temperature in Texas", "yAxisName": "Average Monthly Temperature", "anchorradius": "5", "plotToolText": "Average temperature in $label is $dataValue", "showHoverEffect": "1", "showvalues": "0", "numberSuffix": "°C", "theme": "fusion", "anchorBgColor": "#72D7B2", "paletteColors": "#72D7B2" }, "annotations": { "groups": [ { "id": "anchor-highlight", "items": [ { "id": "high-star", "type": "circle", "x": "$dataset.0.set.7.x", "y": "$dataset.0.set.7.y", "radius": "12", "color": "#cc0000", "border": "2", "borderColor": "#0075c2" }, { "id": "label", "type": "text", "text": "Hottest Month", "fillcolor": "#0075c2", "rotate": "90", "x": "$dataset.0.set.7.x+75", "y": "$dataset.0.set.7.y-2" } ] } ] }, "data": [ { "label": "Jan", "value": "1" }, { "label": "Feb", "value": "5" }, { "label": "Mar", "value": "10" }, { "label": "Apr", "value": "12" }, { "label": "May", "value": "14" }, { "label": "Jun", "value": "16" }, { "label": "Jul", "value": "20" }, { "label": "Aug", "value": "22" }, { "label": "Sep", "value": "20" }, { "label": "Oct", "value": "16" }, { "label": "Nov", "value": "7" }, { "label": "Dec", "value": "2" } ] } 
{
    "chart": {
        "caption": "Average Monthly Temperature in Texas",
        "yAxisName": "Average Monthly Temperature",
        "anchorradius": "5",
        "plotToolText": "Average temperature in $label is <b>$dataValue</b>",
        "showHoverEffect": "1",
        "showvalues": "0",
        "numberSuffix": "°C",
        "theme": "fusion",
        "anchorBgColor": "#72D7B2",
        "paletteColors": "#72D7B2"
    },
    "annotations": {
        "groups": [
            {
                "id": "anchor-highlight",
                "items": [
                    {
                        "id": "high-star",
                        "type": "circle",
                        "x": "$dataset.0.set.7.x",
                        "y": "$dataset.0.set.7.y",
                        "radius": "12",
                        "color": "#cc0000",
                        "border": "2",
                        "borderColor": "#0075c2"
                    },
                    {
                        "id": "label",
                        "type": "text",
                        "text": "Hottest Month",
                        "fillcolor": "#0075c2",
                        "rotate": "90",
                        "x": "$dataset.0.set.7.x+75",
                        "y": "$dataset.0.set.7.y-2"
                    }
                ]
            }
        ]
    },
    "data": [
        {
            "label": "Jan",
            "value": "1"
        },
        {
            "label": "Feb",
            "value": "5"
        },
        {
            "label": "Mar",
            "value": "10"
        },
        {
            "label": "Apr",
            "value": "12"
        },
        {
            "label": "May",
            "value": "14"
        },
        {
            "label": "Jun",
            "value": "16"
        },
        {
            "label": "Jul",
            "value": "20"
        },
        {
            "label": "Aug",
            "value": "22"
        },
        {
            "label": "Sep",
            "value": "20"
        },
        {
            "label": "Oct",
            "value": "16"
        },
        {
            "label": "Nov",
            "value": "7"
        },
        {
            "label": "Dec",
            "value": "2"
        }
    ]
}

Setup ember-cli-build.js

In this step we will include all the necessary files and add the dependency to create the Spline 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 necessary libraries and components have been included 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';

export default Component.extend({
    width: 700,
    height: 400,
    type: 'spline',
    dataFormat: 'json',
    dataSource: {
        "chart": {
            "caption": "Average Monthly Temperature in Texas",
            "yAxisName": "Average Monthly Temperature",
            "anchorradius": "5",
            "plotToolText": "Average temperature in $label is <b>$dataValue</b>",
            "showHoverEffect": "1",
            "showvalues": "0",
            "numberSuffix": "°C",
            "theme": "fusion",
            "anchorBgColor": "#72D7B2",
            "paletteColors": "#72D7B2"
        },
        "annotations": {
            "groups": [{
                "id": "anchor-highlight",
                "items": [{
                    "id": "high-star",
                    "type": "circle",
                    "x": "$dataset.0.set.7.x",
                    "y": "$dataset.0.set.7.y",
                    "radius": "12",
                    "color": "#cc0000",
                    "border": "2",
                    "borderColor": "#0075c2"
                }, {
                    "id": "label",
                    "type": "text",
                    "text": "Hottest Month",
                    "fillcolor": "#0075c2",
                    "rotate": "90",
                    "x": "$dataset.0.set.7.x+75",
                    "y": "$dataset.0.set.7.y-2"
                }]
            }]
        },
        "data": [{
            "label": "Jan",
            "value": "1"
        }, {
            "label": "Feb",
            "value": "5"
        }, {
            "label": "Mar",
            "value": "10"
        }, {
            "label": "Apr",
            "value": "12"
        }, {
            "label": "May",
            "value": "14"
        }, {
            "label": "Jun",
            "value": "16"
        }, {
            "label": "Jul",
            "value": "20"
        }, {
            "label": "Aug",
            "value": "22"
        }, {
            "label": "Sep",
            "value": "20"
        }, {
            "label": "Oct",
            "value": "16"
        }, {
            "label": "Nov",
            "value": "7"
        }, {
            "label": "Dec",
            "value": "2"
        }]
    }
});

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.
    • In the dataSource, create an annotations object to specify the cosmetics and functionalities of the annotation.

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
}}

In the above code add the fusioncharts component to chart-viewer.hbs template to render the chart.

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