org.rosuda.ibase
Class MapSegmentEntry

java.lang.Object
  org.rosuda.ibase.MapSegmentEntry

public class MapSegmentEntry
extends Object

MapSegmentEntry encapsulates individual polygons in a map segment. They are specified by the coordinates of the points along the path. Each map segment may consist of multiple segment entries.

Field Summary

boolean	hasBorder flag specifying whether this polygon has a border
boolean	isLake flag specifying whether this polygon is a "lake"
double	maxX extents of the polygon (bounding box)
double	maxY extents of the polygon (bounding box)
double	minX extents of the polygon (bounding box)
double	minY extents of the polygon (bounding box)
double[]	xp coordinates of the polygon points
double[]	yp coordinates of the polygon points

Constructor Summary

MapSegmentEntry()
create a new, empty map segment entry.

MapSegmentEntry(double[] xpt, double[] ypt, boolean lake, boolean border)
designated constructor of a map segment entry.

MapSegmentEntry(double[] xpt, double[] ypt, int offset, int length, boolean lake, boolean border)
constructor of a map segment entry, allowing the use of a part of an array. length is shrunk to reflect xpt.length where necessary and where relevant xpt.length>ypt.length causes ypt to be padded with zeros.

Method Summary

void	fixBoundingBox() re-calculate bounding box.

Methods inherited from class java.lang.Object

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

Field Detail

xp

public double[] xp

coordinates of the polygon points

yp

public double[] yp

coordinates of the polygon points

isLake

public boolean isLake

flag specifying whether this polygon is a "lake"

hasBorder

public boolean hasBorder

flag specifying whether this polygon has a border

minX

public double minX

extents of the polygon (bounding box)

maxX

public double maxX

extents of the polygon (bounding box)

minY

public double minY

extents of the polygon (bounding box)

maxY

public double maxY

extents of the polygon (bounding box)

Constructor Detail

MapSegmentEntry

public MapSegmentEntry()

create a new, empty map segment entry.

MapSegmentEntry

public MapSegmentEntry(double[] xpt,
                       double[] ypt,
                       boolean lake,
                       boolean border)

designated constructor of a map segment entry. Note that xpt.length specifies the number of points used. If xpt.length>ypt.length then ypt is padded with zeros.

Parameters:

xpt - x-coordinates of the points (length of this array specifies the number of points of this entry)

ypt - y-coordinates of the points (padded with 0 if too short)

lake - flag specifying whether this polygon is a lake

border - border flag of this segment entry

MapSegmentEntry

public MapSegmentEntry(double[] xpt,
                       double[] ypt,
                       int offset,
                       int length,
                       boolean lake,
                       boolean border)

constructor of a map segment entry, allowing the use of a part of an array. length is shrunk to reflect xpt.length where necessary and where relevant xpt.length>ypt.length causes ypt to be padded with zeros.

Parameters:

xpt - x-coordinates of the points

ypt - y-coordinates of the points (padded with 0 if too short)

offset - offset at which to start

length - number of entries to use (will be reduced if offset+length is larger that the xpt array)

lake - flag specifying whether this polygon is a lake

border - border flag of this segment entry

Method Detail

fixBoundingBox

public void fixBoundingBox()

re-calculate bounding box. Call this method after modifying the xp or yp arrays.