org.squigle.layers
Class PolygonLayer

java.lang.Object
  |
  +--org.squigle.layers.Layer
        |
        +--org.squigle.layers.PolygonLayer

public class PolygonLayer

extends Layer

Field Summary

Fields inherited from class org.squigle.layers.Layer

height, max_threshold, min_threshold, screenDiag, vp_lat_1, vp_lat_2, vp_lon_1, vp_lon_2, width

Constructor Summary

PolygonLayer(java.nio.ByteBuffer geoData, int geoDataPointer, java.nio.ByteBuffer metaData, int metaDataHeaderPointer, org.squigle.layers.MetaDataHandler metaDataHandler)
Constructor for a readable layer

PolygonLayer(float lon_1, float lat_1, float lon_2, float lat_2, java.awt.Color renderColor, int renderWidth, java.lang.String[] metaDataHeaders, org.squigle.layers.MetaDataHandler metaDataHandler)
Constructor for writable PolygonLayer

Method Summary

void	addPolygon(float[][] polygon, java.lang.String[] metaData) Add a polygon element to a writable polygonLayer
void	paint(java.awt.Graphics g) A polygonLayer specific rendering function
java.lang.String[][]	query(float lon_1, float lat_1, float lon_2, float lat_2) Search a layer for metaData within the bounding coordinates
int	sort(int maxWeight, int maxDepth) The sort function processes the polygon elements from a writable layer, sorting them into a BSP tree with a depth no greater than maxDepth, and no more than maxWeight elements per node.
int	write(java.io.RandomAccessFile raf) Writes a readable PolygonLayer to a random access file handle

Methods inherited from class org.squigle.layers.Layer

boundsCollision, free

Methods inherited from class java.lang.Object

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

Constructor Detail

PolygonLayer

public PolygonLayer(float lon_1,
                    float lat_1,
                    float lon_2,
                    float lat_2,
                    java.awt.Color renderColor,
                    int renderWidth,
                    java.lang.String[] metaDataHeaders,
                    org.squigle.layers.MetaDataHandler metaDataHandler)

Constructor for writable PolygonLayer

Parameters:

lon_1 - the upper left longitude of layer

lat_1 - the upper left latitude of layer

lon_2 - the lower right longitude of layer

lat_2 - the lower right latitude of layer

renderColor - the color to render the layer as

renderWidth - the thickness of the elements rendered

metaDataHeaders - the column headers for the layers metadata

PolygonLayer

public PolygonLayer(java.nio.ByteBuffer geoData,
                    int geoDataPointer,
                    java.nio.ByteBuffer metaData,
                    int metaDataHeaderPointer,
                    org.squigle.layers.MetaDataHandler metaDataHandler)

Constructor for a readable layer

Parameters:

geoData - a refrence to a ByteBuffer that contains the layer data

geoDataPointer - a byte offset in the geoData ByteBuffer that points to the start of the geoData layer

metaData - a refrence to a ByteBuffer that containts the layer's metadata

metaDataHeaderPointer - a byte offset in the metaData ByteBuffer that points to the layers header definitions

Method Detail

addPolygon

public void addPolygon(float[][] polygon,
                       java.lang.String[] metaData)

Add a polygon element to a writable polygonLayer

Parameters:

metaData - the polygon's metaData table record

sort

public int sort(int maxWeight,
                int maxDepth)

The sort function processes the polygon elements from a writable layer, sorting them into a BSP tree with a depth no greater than maxDepth, and no more than maxWeight elements per node. Depth overrides weight in cases where the max depth is reached but the node has more elements than maxWeight. On completion, sort sets readable = true.

Specified by:

sort in class Layer

Parameters:

maxWeight - the maximum elements a node should hold before splitting

maxDepth - the maximum depth nodes are allowed to split

Returns:

the number of elements processed

paint

public void paint(java.awt.Graphics g)

A polygonLayer specific rendering function

Specified by:

paint in class Layer

Parameters:

g - the Graphics object the layer is rendered to

query

public java.lang.String[][] query(float lon_1,
                                  float lat_1,
                                  float lon_2,
                                  float lat_2)

Search a layer for metaData within the bounding coordinates

Specified by:

query in class Layer

Parameters:

lon_1 - the upper left longitude to search from

lat_1 - the upper left latitude to search from

lon_2 - the lower right longitude to search to

lat_2 - the lower right latitude to search to

Returns:

an array of metaData String[]'s

write

public int write(java.io.RandomAccessFile raf)
          throws java.io.IOException

Writes a readable PolygonLayer to a random access file handle

Specified by:

write in class Layer

Parameters:

raf - the random access file to write the layer to

Returns:

the filepointer to the root of the layer

java.io.IOException