dc.js Class: geoChoroplethChart (original) (raw)

dc. geoChoroplethChart

new geoChoroplethChart(parent [, chartGroup])

Parameters:

Name	Type	Argument	Description
parent	String\|node	d3.selection
chartGroup	String		The name of the chart group this chart instance should be placed in. Interaction with a chart will only trigger events and redraws within the chart's group.

Mixes In:

Source:

geo-choropleth-chart.js,line 1

Returns:

Type

dc.geoChoroplethChart

Example

// create a choropleth chart under '#us-chart' element using the default global chart group var chart1 = dc.geoChoroplethChart('#us-chart'); // create a choropleth chart under '#us-chart2' element using chart group A var chart2 = dc.compositeChart('#us-chart2', 'chartGroupA');

Methods

geoJsons()

Returns all GeoJson layers currently registered with this chart. The returned array is a reference to this chart's internal data structure, so any modification to this array will also modify this chart's internal registration.

Source:

geo-choropleth-chart.js,line 251

Returns:

Type

Array.<{name:String, data: Object, accessor: function()}>

geoPath()

Returns the d3.geoPath object used to render the projection and features. Can be useful for figuring out the bounding box of the feature set and thus a way to calculate scale and translation for the projection.

Source:

geo-choropleth-chart.js,line 264

See:

d3.geoPath

Returns:

Type

d3.geoPath

overlayGeoJson(json, name, keyAccessor)

mandatory

Use this function to insert a new GeoJson map layer. This function can be invoked multiple times if you have multiple GeoJson data layers to render on top of each other. If you overlay multiple layers with the same name the new overlay will override the existing one.

Parameters:

Name	Type	Description
json	geoJson	a geojson feed
name	String	name of the layer
keyAccessor	function	accessor function used to extract 'key' from the GeoJson data. The key extracted by this function should match the keys returned by the crossfilter groups.