# Leaflet.minichart

Leaflet.minichart is a leaflet plugin for adding to a leaflet map small animated bar charts, pie charts or polar area charts.

It can be used to visualize multiple variables associated to geographical coordinates and to look at the evolution of these variables.

## Usage

You need to include the `leaflet` CSS and javascript files and then the `leaflet.minichart` javascript file in the head section of your document:

    <link rel="stylesheet" href="https://unpkg.com/leaflet@1.0.2/dist/leaflet.css" media="screen" title="leaflet">
    <script src="https://unpkg.com/leaflet@1.0.2/dist/leaflet.js" charset="utf-8"></script>
    <script src="https://unpkg.com/leaflet.minichart@0.1.3/dist/leaflet.minichart.min.js" charset="utf-8"></script>

Once these files included, you can create charts with function `L.minichart()`. All parameters are described here.

## Example

Here is a sample code that initializes a map and adds to it a barchart that represents three random values. Then the code updates the value every two seconds and redraws the chart.

    var center = [48.861415, 2.349326];

    var mymap = L.map('map').setView(coord, 13);
    L.tileLayer('http://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png').addTo(mymap);

    // Let us generate fake data
    function fakeData() {
      return [Math.Random(), Math.random(), Math.random()];
    }

    // Create a barchart
    var myBarChart = L.minichart(center, {data: fakeData()});
    mymap.addLayer(myBarChart);

    // Update data every 2 seconds
    setInterval(function() {
      myBarChart.setOptions({data: fakeData()})
    }, 2000);

You can find more complete examples here:

- International comparison of PISA scores

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