<dvt:mapPieGraphTheme>

mapPieGraphTheme map pie graph theme

The Pie Graph Theme tag provides the ability to show statistics related to given locations on a map. This theme displays a pie graph at points to represent data values associated with those locations. For example, this tag might be used to display a pie graph at store locations to show sales values for a number of products at each store.

When a Pie Graph Theme is created, default colors are assigned to the slices in the graph. These colors can be customized with built-in styles or by using the mapPieSliceSet and the mapPieSliceItem tags.

Only one Graph Theme (Bar or Pie) can be visible in a map at a given time

Model

The Pie Graph Theme uses an underlying model to abstract the data that gets displayed in the theme. The specific model class is oracle.adf.view.faces.bi.model.GeoMapDataModel. The GeoMapDataModel contains information about the location and data associated with each pie graph. The model can be set through the value attribute of the mapPieGraphTheme tag.

Pie Graph Styles

Styles can be applied to the Pie Graph Theme to customize the color scheme of the pie slices. This is done with the styleName attribute. This attribute can be set to either the name of one of the predefined styles or the path of a custom XML file that defines the desired style. To set the color of each pie slice individually, use the mapPieSliceSet and mapPieSliceItem tags.

In the example below, the Pie Graph Theme uses the predefined "Autumn" style

    <dvt:map ...map attributes...>
      <dvt:mapPieGraphTheme id="mapPieGraphTheme1"
                          themename="MAP_STATES_NAME"
                          locationColumn="POLYGON_NAME"
                          value="#{backingBean.geoMapModel}"
                          stylename="Autumn"/>
    </dvt:map>
    

Connection to Base Map Themes

The base map theme on which this Pie Graph Theme layer is based is specified by the themeName attribute. This base map theme must come from the same data source as the base map.

If you are using Oracle's hosted eLocation services to configure the Map component, the themeName attribute for this tag should be set to one of the following five choices:

• MAP_CONTINENTS_NAME
• MAP_COUNTIES_NAME
• MAP_COUNTRIES_NAME
• MAP_STATES_NAME
• MAP_STATES_ABBRV

Depending on the base map theme you choose your data model should have the corresponding polygon names. If you choose MAP_STATES_ABBRV then your data model must have state abbreviations for matching the rows with the appropriate polygons.

Legend Customization

By default, the ID of the mapPieGraphTheme is used as the label when that theme is displayed in the legend or in the Theme Selection dialog. However, each mapPieGraphTheme tag has the following attributes that serve as optional labels for the theme:

• shortLabel: Specifies a label for the theme when displayed in the map legend
• menuLabel: Specifies a label for the theme in the Theme Selection dialog

The labels for each slice color in the legend are determined by the labels that were used to create the GeoMapDataModel for this theme.

Selection

The Pie Graph Theme supports the ability to select one or more pie graphs on the map using the mapToolbar's rectangle/circle/polygon/point selection tools. When the user defines a selected area on the map, any of the pie graphs that fall within the selected area will be highlighted and the selectionListener will be fired.

Supported Child tags

• <dvt:numberFormat>
• <dvt:mapPieSliceSet>

Events

Attributes

public void processSelection(MapSelectionEvent mapSelectionEvent) {
    Iterator iterator = mapSelectionEvent.getIterator();
        
    while (iterator.hasNext())
    {
        DataContent dt = (DataContent)iterator.next();    
        String selectedLocation = dt.getLocationName();
        System.out.println (selectedLocation);
    }                        
}                
        

public void processMouseClick(MapClickActionEvent mapClickActionEvent) {
    if (mapClickActionEvent.getDataContent() != null)
    {
        DataContent dt = mapClickActionEvent.getDataContent();
        System.out.println ("Location Name: " + dt.getLocationName());
    }
        
    System.out.println("MouseX " + mapClickActionEvent.getMouseX()); 
    System.out.println("MouseY " + mapClickActionEvent.getMouseY());         
}