// **********************************************************************
//
// <copyright>
//
// BBN Technologies
// 10 Moulton Street
// Cambridge, MA 02138
// (617) 873-8000
//
// Copyright (C) BBNT Solutions LLC. All rights reserved.
//
// </copyright>
// **********************************************************************
//
// $Source: /cvs/distapps/openmap/src/openmap/com/bbn/openmap/layer/link/LinkBoundingPoly.java,v $
// $RCSfile: LinkBoundingPoly.java,v $
// $Revision: 1.3.2.1 $
// $Date: 2004/10/14 18:27:07 $
// $Author: dietrick $
//
// **********************************************************************
package com.bbn.openmap.layer.link;
import com.bbn.openmap.LatLonPoint;
import com.bbn.openmap.util.Debug;
import java.io.IOException;
import java.io.DataOutput;
import java.io.DataInput;
/**
* LinkBoundingPoly objects are used to describe simple polygons that
* cover a certain area. If the area described is in coordinates, the
* polygon should not be sued for areas covering a pole or straddling
* the dateline. More than one LinkBoundingPolys should be used for
* areas like that.
*/
public class LinkBoundingPoly {
public float maxX;
public float maxY;
public float minX;
public float minY;
protected float[] points;
/**
* The constructor to use when reading the bounding polygon off an
* input stream.
*
* @param dis DataInputStream to read from.
*/
public LinkBoundingPoly(DataInput dis) throws IOException {
read(dis);
}
/**
* The constructor to use to create a LinkBoundingPoly to write to
* an output stream.
*
* @param poly a series of alternating x, y points describing a
* polygon.
*/
public LinkBoundingPoly(float[] poly) {
points = poly;
}
/**
* Create a LinkBoundingPoly out of minimum and max x, y, values.
*
* @param minX minimum X value.
* @param minY minimum Y value.
* @param maxX maximum X value.
* @param maxY maximum Y value.
*/
public LinkBoundingPoly(float minX, float minY, float maxX, float maxY) {
points = new float[10];
Debug.message("link",
"LinkBoundingPoly: Creating link bounding poly with " + minX
+ ", " + minY + ", " + maxX + ", " + maxY);
points[0] = minY;
points[1] = minX;
points[2] = maxY;
points[3] = minX;
points[4] = maxY;
points[5] = maxX;
points[6] = minY;
points[7] = maxX;
points[8] = minY;
points[9] = minX;
}
/**
* Write the polygon on the output stream. If the number of points
* is an odd number, the last number will be left off.
*
* @param dos the DataOutput to write to.
*/
public void write(DataOutput dos) throws IOException {
// round down to a multiple of two.
int length = (points.length / 2) * 2;
dos.writeInt(length);
for (int i = 0; i < length; i++) {
dos.writeFloat(points[i]);
}
}
/**
* Read the bounding polygon off the input stream.
*
* @param dis DataInputStream to read from.
*/
public void read(DataInput dis) throws IOException {
Debug.message("link", "LinkBoundingPoly: read()");
int polyLength = dis.readInt();
points = new float[polyLength];
float x, y;
for (int i = 0; i < points.length; i += 2) {
y = dis.readFloat();
x = dis.readFloat();
if (i == 0) {
minX = x;
minY = y;
maxX = x;
maxY = y;
}
points[i] = y;
points[i + 1] = x;
if (x < minX)
minX = x;
if (x > maxX)
maxX = x;
if (y < minY)
minY = y;
if (y > maxY)
maxY = y;
}
}
/**
* Return the polygon points, as a series of alternating x and y
* values.
*
* @return float[] of alternating x, y, points.
*/
public float[] getPoints() {
return points;
}
/**
* Convert the points to Lat/Lon points. There is no guarantee
* that the points really translate into latitude and longitude
* points.
*
* @return LatLonPoints
*/
public LatLonPoint[] getLatLonPoints() {
LatLonPoint[] boundingPoly = new LatLonPoint[points.length / 2];
float lat, lon;
for (int i = 0; i < points.length; i += 2) {
lat = points[i];
lon = points[i + 1];
boundingPoly[i] = new LatLonPoint(lat, lon);
}
return boundingPoly;
}
public String toString() {
StringBuffer s = new StringBuffer();
s.append(" LinkBoundingPoly has " + points.length / 2 + " points.");
for (int i = 0; i < points.length; i += 2) {
s.append("\n |Lat = " + points[i] + ", Lon = " + points[i + 1]
+ "|");
}
return s.toString();
}
}