WebCharter Example

From Fmepedia

The attached workspace shows an example use of the WebCharter transformer.

Click here to check another example of WebCharter and ImageFetcher use.

Workspace Screenshot

Above: WebCharter Example Workspace.

The workspace reads a set of park data (sampled for clarity) and calculates the area of each park. The features are aggregated together to produce a single feature with a list of attributes. The WebCharter turns the list into a URL suitable for the Google Charts API, which is subsequently sent off by the ImageFetcher. The results are returned as a raster feature which is converted into GeoTIFF.

In this example the URL formulated by the WebCharter is:

http://chart.apis.google.com/chart?cht=p3
&chd=e:dbPA..AzRNBUD7BX
&chs=750x350
&chtt=City+of Interopolis Park Area (Sq Feet)
&chl=East Destination|Big Walnut Creek|Morris Williams|T.A. Brown|Bartholomew|Pecan Springs|Dottie Jordan|Andrews
&chco=800000

Surprisingly all of the data that goes to make up the chart is stored as: &chd=e:dbPA..AzRNBUD7BX

Output

This output is a pie chart - it could just as easily be a line or bar chart.

Above: The output image as displayed in the FME Universal Viewer.