Writing a Data Source

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A data source is a class that connects an IlvMapReusableFeatureIterator, an IlvFeatureRenderer and an IlvMapLayer. It uses the iterator to get global data information, such as the coordinate system and bounding box, and the list of IlvMapFeature to parse. Then it uses the renderer to create graphic objects. Finally it uses the layer to manage the order and style of those objects. This section describes:

• Renderer Management
• Layer Management
• Data Tiling
• Feature Management

The source code for the Map Builder demonstration, which contains all of the code described in this section, can be found at <installdir>/jviews-maps81/samples/mapbuilder/index.html