Generic Code Sample for Creating a Map

Programming with JViews Maps > Creating a Map Application Using the API > Generic Code Sample for Creating a Map

Generic Code Sample for Creating a Map

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This section steps you through the creation of a basic map using a generic code sample.

The complete source code for this example can be found in the following file:

<installdir>/jviews-maps81/codefragments/readers/src/GenericReader.java

Instantiate the reader. In this example, you are using the IlvShapeReader.

try 
{
    featureIterator = new IlvShapeFileReader(shapeFileName, dbfFileName);
} 
catch (IOException e) 
{
   System.err.println("IOError while instantiating reader");
}

Retrieve the feature renderer from the reader.dted.

IlvFeatureRenderer renderer =
featureIterator.getDefaultFeatureRenderer();

Create coordinate transformation.

IlvCoordinateTransformation identity = 
IlvCoordinateTransformation.CreateTransformation(null, null);

Retrieve the first map feature.

IlvMapFeature feature = null;
try 
{
    feature = featureIterator.getNextFeature();
} 
catch (IOException io) 
{
    System.err.println("IOExeption while getting next feature"
                       +io.getMessage());
}
// Loop on all the available map features.
while (feature != null) 
{
  try {

Create the graphic object representing the map feature.

IlvGraphic graphic = renderer.makeGraphic(feature, identity);

Add the graphic object to the manager.

manager.addObject(graphic, layerIndex, false);

Handle exceptions.

} catch (IlvMapRenderException e) 
{
// Should not occur: renderer provided by the feature iterator.
System.out.println("Rendering Exception " + e.getMessage());
} catch (IlvCoordinateTransformationException cte) {
System.err.println("Coordinate transformation exeception " + 
cte.getMessage());
}
}

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