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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 vue-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 $label is <b>$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"
        }
    ]
}

The code to render a chart is given below:

//Including Vue
import Vue from 'vue';

// Include the vue-fusioncharts component
import VueFusionCharts from 'vue-fusioncharts';

//Include the FusionCharts library
import FusionCharts from 'fusioncharts';

//Include the chart type
import Charts from 'fusioncharts/fusioncharts.charts';

//import the theme
import FusionTheme from 'fusioncharts/themes/fusioncharts.theme.fusion';

// Register VueFusionCharts component
Vue.use(VueFusionCharts);

// register VueFusionCharts component
Vue.use(VueFusionCharts, FusionCharts, Charts, FusionTheme)

var app = new Vue({
    el: '#app',
    data: {
        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"
            }]
        }
    }
});

Now, use the fusioncharts directive in a template. The HTML template is given below:

<div id="app">
    <fusioncharts
    :type="type"
    :width="width"
    :height="height"
    :dataFormat="dataFormat"
    :dataSource="dataSource"
    ></fusioncharts>
</div>

The above chart has been rendered using the following steps:

  1. Include the necessary libraries and components using import. For example, vue-fusioncharts, fusioncharts, etc.

  2. Register vue-fusioncharts component.

  3. 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.
    • Create an annotations object in the dataSource, to specify the cosmetics and functionalities of the annotation.

  4. Create a fusioncharts directive in a template.