PieChart

The PieChart is a plot operator that computes a pie chart for a given vector dataset. Moreover, the operator considers all data in the given query rectangle.

There are multiple variants on how to compute the slices of the pie chart. In addition, it is possible to compute a donut chart instead of a standard pie chart.

Errors

The operator returns an error in the following cases.

• The attribute for the given columnName does not exist.
• The number of slices is too large: If the number of slices is greater than 32, the operator returns an error.

Notes

If the attribute has a Measurement of type Classification, the operator uses the class name instead of the raw value.

Parameters

Name	Type	Description	Examples
type	string		"count"
columnName	string	The names of the attribute to generate pies for.	"name" "class"
donut	boolean	Whether to render the chart as a donut.	false

Sources

Name	Type	Description
vector	VectorOperator	An operator that produces vector data.

Examples

{
    "type": "PieChart",
    "params": {
        "type": "count",
        "columnName": "class",
        "donut": false
    },
    "sources": {
        "vector": {
            "type": "OgrSource",
            "params": {
                "data": "land_use"
            }
        }
    }
}