The DrillDown Renderer

Developing with the SDK > Using and Adding Renderers > Predefined Renderers > The DrillDown Renderer

The DrillDown Renderer

The DrillDown renderer allows you to display more and more objects as you zoom in the view. The objects are dispatched to different manager layers with visibility filters, which are configured according to the object property DrillDownZoom. All the objects with the same drill-down zoom are placed in a manager layer that is visible only when the view's zoom level is greater than the drill-down zoom.

The following code extract illustrates how to enable the DrillDown renderer:

SDM {
  DrilDown: "true";
}

Code Sample 4.15 Enabling the DrillDown Renderer

Table 4.8lists the global properties of the DrillDown renderer.

Table 4.8 Global Properties of the Drill Down Renderer

Property	Type	Default	Description
showingIndicator	boolean	false	Specifies whether an icon should be displayed in the top-left corner of the view to alert the user that some objects are not visible at the current zoom level. The indicator disappears when the user zooms in enough to make all objects visible.

The following code extract shows how to configure the DrillDown renderer global property:

DrillDown {
  showingIndicator: "true";
}

Code Sample 4.16 Configuring the DrillDown Renderer

Table 4.9 lists the per-object properties of the DrillDown renderer.

Table 4.9 Per-Object Properties of the DrillDown Renderer

Property	Type	Default	Description
DrillDownZoom	double	0	Specifies the zoom level above which the objects become visible.

The following code extract illustrates how to specify the drill down zoom level for objects based on data model properties. In this scenario, links become visible according to the data model property distance:

link[distance>="1000"] {
  DrillDownZoom : "0";
}
link[distance<"1000"] {
  DrillDownZoom : "2";
}
link[distance<"100"] {
  DrillDownZoom : "4";
}
link[distance<"10"] {
  DrillDownZoom : "8";
}

Code Sample 4.17 Specifying Drill Down Zoom Levels

See the class ilog.views.sdm.renderer.IlvDrillDownRenderer for more details.

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