ArcGIS Engine Developer Guide

BUILDING A COMMAND-LINE JAVA APPLICATION
System.out.println(" - Calculating ... ");
Tin tin = new Tin(tinAdv);
3. Next, get the spatial reference of the Tin and send it as a parameter to a
createBasicFields() method that will be defined in the next section. In addition,
you need to send a geometry type point since your resulting feature class will
be a point feature class.
ISpatialReference tinSpatialRef = tin.getSpatialReference();
IFields fields = createBasicFields(esriGeometryType.esriGeometryPoint,
false, true, tinSpatialRef);
4. Now that the basic fields have been generated, the next step is to create an
output shapefile. WorkspaceFactory is used as a dispenser of workspaces to
create an instance of a ShapefileWorkspaceFactory class. The IFeatureWorkspace
interface is used to access and manage datasets. You will cross-cast to the
returned object that implements IWorkspace by creating an instance of the
IFeatureWorkspaceProxy class using its object constructor. Finally, your output
shapefile is generated using the createFeatureClass() method to create a
standalone feature class.
// Create output shapefile.
IWorkspaceFactory wkspFactory = new ShapefileWorkspaceFactory();
IFeatureWorkspace featureWksp = new IFeatureWorkspaceProxy(
wkspFactory.openFromFile(shapePath, 0));
IFeatureClass outFC = new IFeatureClassProxy(
featureWksp.createFeatureClass( shapeFile,
fields,
null,
null,
esriFeatureType.esriFTSimple,
"Shape",
""));
5. The final step in creating this method is to populate the newly created feature
class with the value of the nodes from your input TIN. The
makeNodeEnumerator() method returns enumerations of nodes based on an
extent and a criteria. The extent used is that of the input TIN dataset, and all
data inside the TIN is used as the criteria. Once an enumeration object is filled
with your TIN nodes, use a FeatureCursor as a data access object to iterate over
the set of rows in your newly created feature class and a FeatureBuffer object to
hold the state of the row. Next, create an instance of the Point class and
populate it with your TIN nodes by instantiating an ITinNode interface with
the objects returned by your enumeration. While your node is not null, loop
through them and populate your feature class.
// Get tin node enum.
IEnumTinNode nodeEnum = tin.makeNodeEnumerator(tin.getExtent(),
esriTinQualification.esriTinInsideDataArea, null);
//Store node to shapefile.
IFeatureCursor outCursor = outFC.IFeatureClass_insert(true);
IFeatureBuffer outBuffer = outFC.createFeatureBuffer();
IPoint point = new Point();
ITinNode node = nodeEnum.IEnumTinNode_next();
418 • ArcGIS Engine Developer Guide