org.squigle.layers
Class PointLayer

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

public class PointLayer

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

PointLayer(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 PointLayer

Method Summary

void	addPoint(float[] point, java.lang.String[] metaData) Add a point element to a writable PointLayer
void	free()
java.awt.Color	gradiant(java.awt.Color a, java.awt.Color b, double balance)
void	paint(java.awt.Graphics g) A PointLayer 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 point 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 PointLayer to a random access file handle

Methods inherited from class org.squigle.layers.Layer

boundsCollision

Methods inherited from class java.lang.Object

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

Constructor Detail

PointLayer

public PointLayer(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 PointLayer

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

Method Detail

addPoint

public void addPoint(float[] point,
                     java.lang.String[] metaData)

Add a point element to a writable PointLayer

Parameters:

point - the lat, lon, height values for the point being added

metaData - the point's metaData table record

sort

public int sort(int maxWeight,
                int maxDepth)

The sort function processes the point 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

gradiant

public java.awt.Color gradiant(java.awt.Color a,
                               java.awt.Color b,
                               double balance)

free

public void free()

Overrides:

free in class Layer

paint

public void paint(java.awt.Graphics g)

A PointLayer 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 PointLayer 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