public class GPS {


private String strLat;//標準的緯度
private String strLon;//標準的經度

private double dDFLat;//緯度。單位：度分
private double dDFLon;//經度。單位：度分

private double dFLat;//緯度。單位：分
private double dFLon;//經度。單位：分

private double dDLat;//緯度。單位：度
private double dDLon;//經度。單位：度


private int iNetLat;//緯度的網格座標
private int iNetLon;//經度的網格座標

private boolean isValid;//GPS是否有效
private boolean isNetValid;//網格座標是否有效

public boolean isValid() {
return isValid;
}

public boolean isNetValid() {
return isNetValid;
}

public String getGpsCode()
{
return strLat + "," + strLon;
}


public GPS() {
this.strLat = "";
this.strLon = "";

this.dDFLat = 0.0;
this.dDFLon = 0.0;

this.dFLat  = 0.0;
this.dFLon  = 0.0;

this.dDLat  = 0.0;
this.dDLon  = 0.0;


this.iNetLat = 0;
this.iNetLon = 0;

this.isValid = false;
this.isNetValid = false;
}

public boolean setByGpsCode(String gpsCode) {
if(null == gpsCode)
{
return false;
}

String[] temp = gpsCode.split(",");
if(temp.length < 2)
{
return false;
}
if(this.setByStandardGps(temp[0], temp[1]))
{
isValid = true;
return true;
}


return false;
}

public boolean setByStandardGps(String strLat, String strLon) {
this.strLat  = strLat;
this.strLon = strLon;

if(this.setStandardToDFCoordinate()
&& this.setFCoordinateWithDFCoordinate() 
&& this.calcDCoordinate())
{
this.isValid = true;
return true;
}

return false;
}


public String getStrLat() {
return strLat;
}

public String getStrLon() {
return strLon;
}

public double getDFLat() {
return dDFLat;
}

public double getDFLon() {
return dDFLon;
}

public double getFLat() {
return dFLat;
}

public double getFLon() {
return dFLon;
}

/**
* 
* @return 緯度。單位：度
*/
public double getDLat() {
return dDLat;
}

/**
* 
* @return 經度。單位：度
*/
public double getDLon() {
return dDLon;
}

public int getNetLat() {
return iNetLat;
}

public int getNetLon() {
return iNetLon;
}




/**
* 標準 轉 度分
* 
*/
private boolean setStandardToDFCoordinate() 
{
if(strLat.length() != 10 || strLon.length() != 11)
{
return false;
}

try
{
String temp = strLat.substring(1);
if (strLat.startsWith("N")) 
{
this.dDFLat = Double.parseDouble(temp);
} 
else if (strLat.startsWith("S")) 
{
this.dDFLat = -Double.parseDouble(temp);
}
else
{
return false;
}


temp = strLon.substring(1);
if (strLon.startsWith("E")) 
{
this.dDFLon = Double.parseDouble(temp);
} 
else if (strLon.startsWith("W")) 
{
this.dDFLon = -Double.parseDouble(temp);
}
else
{
return false;
}
}
catch(NumberFormatException e)
{
return false;
}

return true;
}


/**
* 度分 轉 分
* 
*/
private boolean setFCoordinateWithDFCoordinate() 
{
int iDLat = (int)(dDFLat/100);
int iDLon = (int)(dDFLon/100);

this.dFLat = iDLat*60+(dDFLat-iDLat*100);
this.dFLon = iDLon*60+(dDFLon-iDLon*100);

if(this.dFLat > 5400.0 || this.dFLat < -5400.0
|| this.dFLon > 10800.0 || this.dFLon < -10800.0)
{
return false;
}


return true;
}

/**
* 計算以度為單位的GPS格式
*/
public boolean calcDCoordinate()
{
int iDLat = (int)(dDFLat/100);
int iDLon = (int)(dDFLon/100);

this.dDLat = (dDFLat-iDLat*100)/60 + iDLat;
this.dDLon = (dDFLon-iDLon*100)/60 + iDLon;
 
return true;
}

/**
* 計算網格座標
* @param referGPS 參照站點的GPS
*/
public boolean calcNetCoordinate(GPS referGPS) 
{
if(!this.isValid)
{
return false;
}

double minLat = referGPS.getFLat()-30;
double minLon = referGPS.getFLon()-30;
this.iNetLat = (int)((dFLat-minLat)/0.0058);
this.iNetLon = (int)((dFLon-minLon)/0.0053);
isNetValid = true;

return true;
}


  /**
     * 判斷車輛是否在定點範圍內
     * @param busLat 車輛緯度（例：N2312.1230）
     * @param busLon 車輛經度（例：E11223.1230）
     * @param siteLat 定點緯度（例：N2312.1230）
     * @param siteLon 定點經度（例：E11223.1230）
     * @param radius 定點半徑
     * @return true-是，false-否
*例子isInSiteRange("N2312.1230", "E11223.1230", "N2312.1230", "E11223.1230", 10);
     */
public static boolean isInSiteRange(String busLat, String busLon, String siteLat, String siteLon, int radius)
{
GPS busGps = new GPS();
busGps.setByStandardGps(busLat, busLon);
GPS siteGps = new GPS();
siteGps.setByStandardGps(siteLat, siteLon);

busGps.calcNetCoordinate(siteGps);
siteGps.calcNetCoordinate(siteGps);
//網格座標計算失敗
if(!busGps.isNetValid() || !busGps.isNetValid())
{
return false;
}

int x1 = busGps.getNetLon();
int y1 = busGps.getNetLat();
int x2 = siteGps.getNetLon();
int y2 = siteGps.getNetLat();
int distance = (int)(Math.sqrt(Math.abs((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2)))*10);

return distance <= radius ? true : false;
}




}