Pie Chart on Google map

Question

I want to draw a pie charts on several locations in a Google Map. Is there a way to draw a google pie chart in a particular location in a Google Map to represent a data set (lik

Answer 1

If you're talking about a pie chart drawn with the Visualization API, you could use a custom HTML overlay like the one in this fiddle:

google.load( 'visualization', '1', { packages:['corechart'] });

function ChartMarker( options ) {
    this.setValues( options );

    this.$inner = $('<div>').css({
        position: 'relative',
        left: '-50%', top: '-50%',
        width: options.width,
        height: options.height,
        fontSize: '1px',
        lineHeight: '1px',
        border: '1px solid #888',
        padding: '2px',
        backgroundColor: 'white',
        cursor: 'default'
    });

    this.$div = $('<div>')
        .append( this.$inner )
        .css({
            position: 'absolute',
            display: 'none'
        });
};

ChartMarker.prototype = new google.maps.OverlayView;

ChartMarker.prototype.onAdd = function() {
    $( this.getPanes().overlayMouseTarget ).append( this.$div );
};

ChartMarker.prototype.onRemove = function() {
    this.$div.remove();
};

ChartMarker.prototype.draw = function() {
    var marker = this;
    var projection = this.getProjection();
    var position = projection.fromLatLngToDivPixel( this.get('position') );

    this.$div.css({
        left: position.x,
        top: position.y,
        display: 'block'
    })

    this.$inner
        .html( '<img src="' + this.get('image') + '"/>' )
        .click( function( event ) {
            var events = marker.get('events');
            events && events.click( event );
        });

    this.chart = new google.visualization.PieChart( this.$inner[0] );
    this.chart.draw( this.get('chartData'), this.get('chartOptions') );
};

function initialize() {
    var latLng = new google.maps.LatLng( 40.708762, -74.006731 );

    var map = new google.maps.Map( $('#map_canvas')[0], {
        zoom: 15,
        center: latLng,
        mapTypeId: google.maps.MapTypeId.ROADMAP
    });

    var data = google.visualization.arrayToDataTable([
        [ 'Task', 'Hours per Day' ],
        [ 'Work', 11 ],
        [ 'Eat', 2 ],
        [ 'Commute', 2 ],
        [ 'Watch TV', 2 ],
        [ 'Sleep', 7 ]
    ]);

    var options = {
        title: 'My Daily Activities',
        fontSize: 8
    };

    var marker = new ChartMarker({
        map: map,
        position: latLng,
        width: '250px',
        height: '100px',
        chartData: data,
        chartOptions: options,
        events: {
            click: function( event ) {
                alert( 'Clicked marker' );
            }
        }
    });
};

$( initialize );

Answer 2

Recently I had to implement pie-charts as markers for many locations on the map. Having many locations on the map app also required marker clustering... In my particular case displaying pie-chart as overlay didn't fit, that's why I built simple library. Maybe saying that it is library is too much because it's just one function for now that generates pie-char svg node. Github repository with example how to use function along with google-maps below
Repository