com.bbn.openmap.layer.vpf
Class AreaTable

java.lang.Object
  com.bbn.openmap.layer.vpf.DcwRecordFile
      com.bbn.openmap.layer.vpf.PrimitiveTable
          com.bbn.openmap.layer.vpf.AreaTable

public class AreaTable
extends PrimitiveTable

Read VPF format edge, face, and ring tables to generate filled polygon graphics for OpenMap.

Field Summary

Fields inherited from class com.bbn.openmap.layer.vpf.PrimitiveTable

covtable, idColumn, tile

Fields inherited from class com.bbn.openmap.layer.vpf.DcwRecordFile

byteorder, columnInfo, documentationFileName, filename, ID_COLUMN_NAME, inputFile, MSBFirst, recordLength, tableDescription, tablename, vli

Constructor Summary

AreaTable(CoverageTable cov, EdgeTable edg, TileDirectory tile)
Construct an AreaTable for a tile.

Method Summary

void	close() Close the files associated with this tile.
int	computeEdgePoints(java.util.List<java.lang.Object> facevec, java.util.List<CoordFloatString> allLLPoints) Computes the full set of points that determine the edge of the area.
OMGraphic	drawFeature(VPFFeatureWarehouse warehouse, double dpplat, double dpplon, LatLonPoint ll1, LatLonPoint ll2, java.util.List<java.lang.Object> area, java.lang.String featureType, int primID) Use the warehouse to create a graphic from a feature in the AreaTable.
void	drawTile(VPFGraphicWarehouse warehouse, double dpplat, double dpplon, LatLonPoint ll1, LatLonPoint ll2) Parse the area records for this tile, calling warehouse.createArea once for each record.

Methods inherited from class com.bbn.openmap.layer.vpf.PrimitiveTable

getCoverageTable, getID, getTileDirectory

Methods inherited from class com.bbn.openmap.layer.vpf.DcwRecordFile

finalize, finishInitialization, getColumnCount, getColumnInfo, getColumnName, getDescription, getDocumentationFilename, getRecordCount, getRecordLength, getRow, getRow, getTableFile, getTableName, getTilingAdapter, getTilingAdapter, getTilingAdapter, lookupSchema, lookupSchema, main, parseAllRowsAndPrintSome, parseRow, parseRow, parseSomeRowsAndPrint, printSchema, reopen, seekToRow, whatColumn

Methods inherited from class java.lang.Object

clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

AreaTable

public AreaTable(CoverageTable cov,
                 EdgeTable edg,
                 TileDirectory tile)
          throws FormatException

Construct an AreaTable for a tile.

Parameters:

cov - the coverage table that is our "parent"

edg - the edge table for the same tile as us (can be null)

tile - the tile to parse

Throws:

FormatException - if something goes wrong reading the area

Method Detail

close

public void close()

Close the files associated with this tile. If an edgetable was passed to the constructor, that table is NOT closed. If this instance created its own edgetable, it IS closed.

Overrides:

close in class DcwRecordFile

computeEdgePoints

public int computeEdgePoints(java.util.List<java.lang.Object> facevec,
                             java.util.List<CoordFloatString> allLLPoints)
                      throws FormatException

Computes the full set of points that determine the edge of the area.

Parameters:

facevec - a row from the VPF face table for this area

allLLPoints - a List that gets modified to contain CoordFloatString objects defining the area. CoordFloatString objects with a negative element count (e.g. -3) contain the absolute value of the count (e.g. 3), but must be traversed in reverse order.

Returns:

the total number of points that define the polygon

Throws:

FormatException - may throw FormatExceptions

drawTile

public void drawTile(VPFGraphicWarehouse warehouse,
                     double dpplat,
                     double dpplon,
                     LatLonPoint ll1,
                     LatLonPoint ll2)

Parse the area records for this tile, calling warehouse.createArea once for each record.

Specified by:

drawTile in class PrimitiveTable

Parameters:

warehouse - the warehouse used for createArea calls (must not be null)

dpplat - threshold for latitude thinning (passed to warehouse)

dpplon - threshold for longitude thinngin (passed to warehouse)

ll1 - upperleft of selection region (passed to warehouse)

ll2 - lowerright of selection region (passed to warehouse)

See Also:

VPFGraphicWarehouse.createArea(com.bbn.openmap.layer.vpf.CoverageTable, com.bbn.openmap.layer.vpf.AreaTable, java.util.List, com.bbn.openmap.proj.coords.LatLonPoint, com.bbn.openmap.proj.coords.LatLonPoint, double, double)

drawFeature

public OMGraphic drawFeature(VPFFeatureWarehouse warehouse,
                             double dpplat,
                             double dpplon,
                             LatLonPoint ll1,
                             LatLonPoint ll2,
                             java.util.List<java.lang.Object> area,
                             java.lang.String featureType,
                             int primID)

Use the warehouse to create a graphic from a feature in the AreaTable.

Specified by:

drawFeature in class PrimitiveTable

Parameters:

warehouse - the warehouse used for createArea calls (must not be null)

dpplat - threshold for latitude thinning (passed to warehouse)

dpplon - threshold for longitude thinning (passed to warehouse)

ll1 - upperleft of selection region (passed to warehouse)

ll2 - lowerright of selection region (passed to warehouse)

area - a List containing the AreaTable row contents.

featureType - the string representing the feature type, in case the warehouse wants to do some intelligent rendering.

primID - the primitive ID of the feature, in order to gather attributes if necessary.

See Also:

VPFGraphicWarehouse.createEdge(com.bbn.openmap.layer.vpf.CoverageTable, com.bbn.openmap.layer.vpf.EdgeTable, java.util.List, com.bbn.openmap.proj.coords.LatLonPoint, com.bbn.openmap.proj.coords.LatLonPoint, double, double, com.bbn.openmap.layer.vpf.CoordFloatString)