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Point.java
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158 lines (122 loc) · 4.7 KB
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package javaxt.geospatial.geometry;
//******************************************************************************
//** Point Class - By Peter Borissow
//******************************************************************************
/**
* Basic structure for Points
*
******************************************************************************/
public class Point implements Geometry {
public double y = 0;
public double x = 0;
public double z = 0;
public String srs = "EPSG:4326";
//**************************************************************************
//** Creates a new instance of Line
//**************************************************************************
/**
* @param x Longitude (sometimes referred to as Northing or x)
* specified in Decimal Degrees
*
* @param y Latitude (sometimes referred to as Easting or y)
* specified in Decimal Degrees
*
***************************************************************************/
public Point(double x, double y){
this.x = x;
this.y = y;
}
//**************************************************************************
//** getSRS
//**************************************************************************
//** Sets the srs attribute for this Geometry. */
public void setSRS(String srsName){
if (srsName==null) srs = "";
else srs = srsName.trim();
}
//**************************************************************************
//** getSRS
//**************************************************************************
//** Returns the srs name of this Geometry. */
public String getSRS(){
return srs;
}
//**************************************************************************
//** getName
//**************************************************************************
//** Returns the name of this Geometry. */
public String getName(){
return new Geometry.Name(this).toString();
}
public double getLatitude(){
return y;
}
public double getLongitude(){
return x;
}
public boolean equals(Object obj){
if (obj!=null){
return obj.hashCode()==this.hashCode();
}
else{
return false;
}
}
/*
public boolean equals(Point point){
return equals(point.x, point.y);
}
public boolean equals(double x, double y){
if ((this.x == x) && (this.y == y)){
return true;
}
else{
return false;
}
}
*/
//**************************************************************************
//** toString
//**************************************************************************
/** Used to return a Well-known Text (WKT) representation of the point. */
public String toString(){
return "POINT(" + x + " " + y + ")";
}
//**************************************************************************
//** toString
//**************************************************************************
/** Used to return a Well-known Text (WKT) representation of the point. */
public String toString(String CoordinateSeparator){
return x + CoordinateSeparator + y;
}
//**************************************************************************
//** toGML
//**************************************************************************
/** Used to convert a Point to GML (xml fragment) */
public String toGML(){
String srsName = " srsName=\"" + srs + "\"";
if (srs.length()==0) srsName = "";
StringBuffer Coordinates = new StringBuffer();
Coordinates.append("<gml:Point" + srsName + ">");
Coordinates.append("<gml:coordinates>");
Coordinates.append(toString(","));
Coordinates.append("</gml:coordinates>");
Coordinates.append("</gml:Point>");
return Coordinates.toString().trim();
}
public int hashCode() {
//Algorithm from Effective Java by Joshua Bloch [Jon Aquino]
int result = 17;
result = 37 * result + hashCode(x);
result = 37 * result + hashCode(y);
return result;
}
/**
* Returns a hash code for a double value, using the algorithm from
* Joshua Bloch's book <i>Effective Java"</i>
*/
private static int hashCode(double x) {
long f = Double.doubleToLongBits(x);
return (int)(f^(f>>>32));
}
}