de::psi::telco::sumoplayer::util::GeoCalc Class Reference

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Detailed Description

Definition at line 4 of file GeoCalc.java.

Static Public Member Functions
static double	distance (Point p, Line l)
static double	distance (Point a, Point b)
static double	geoDistanceKm (Point a, Point b)
static double	geoDistanceM (Point a, Point b)
static double	getLatOffset (double lon, double lat, int meters)
static double	getLonOffset (double lon, double lat, int meters)
Static Public Attributes
static final int	EARTH_RADIUS_KM = 6371
static double	KM_PER_LAT = 111.12
static final double	LATITUDE_PER_KM = 1.0/111.12

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Member Function Documentation

static double de::psi::telco::sumoplayer::util::GeoCalc::distance	(	Point	p,
		Line	l
	)			[inline, static]

This function returns the minimum distance from Poit p to Line l. It uses SUNs implementation which uses a scalarproduct projection length to determin the minimal distance.

Parameters:

	p
	l

Returns:

Definition at line 30 of file GeoCalc.java.

References de::psi::telco::sumoplayer::util::Line::getA(), de::psi::telco::sumoplayer::util::Line::getB(), de::psi::telco::sumoplayer::util::Point::getX(), and de::psi::telco::sumoplayer::util::Point::getY().

                                                   {
        double x1 = l.getA().getX();
        double x2 = l.getB().getX();
        double y1 = l.getA().getY();
        double y2 = l.getB().getY();
        double px = p.getX();
        double py = p.getX();
        
        // Adjust vectors relative to x1,y1
        // x2,y2 becomes relative vector from x1,y1 to end of segment
        x2 -= x1;
        y2 -= y1;
        // px,py becomes relative vector from x1,y1 to test point
        px -= x1;
        py -= y1;
        double dotprod = px * x2 + py * y2;
        // dotprod is the length of the px,py vector
        // projected on the x1,y1=>x2,y2 vector times the
        // length of the x1,y1=>x2,y2 vector
        double projlenSq = dotprod * dotprod / (x2 * x2 + y2 * y2);
        // Distance to line is now the length of the relative point
        // vector minus the length of its projection onto the line
        double lenSq = px * px + py * py - projlenSq;
        if (lenSq < 0) {
            lenSq = 0;
        }
        return Math.sqrt(lenSq);
    }

static double de::psi::telco::sumoplayer::util::GeoCalc::distance	(	Point	a,
		Point	b
	)			[inline, static]

Definition at line 10 of file GeoCalc.java.

References de::psi::telco::sumoplayer::util::Point::getX(), and de::psi::telco::sumoplayer::util::Point::getY().

                                                   {
        return Math.sqrt( Math.pow(Math.abs(a.getX()-b.getX()),2) + Math.pow(Math.abs(a.getY()-b.getY()),2) );
    }

static double de::psi::telco::sumoplayer::util::GeoCalc::geoDistanceKm	(	Point	a,
		Point	b
	)			[inline, static]

Definition at line 13 of file GeoCalc.java.

References EARTH_RADIUS_KM, de::psi::telco::sumoplayer::util::Point::getX(), and de::psi::telco::sumoplayer::util::Point::getY().

Referenced by geoDistanceM().

                                                        {
        return Math.acos(Math.sin(Math.toRadians(a.getY()))*Math.sin(Math.toRadians(b.getY())) + 
                Math.cos(Math.toRadians(a.getY()))*Math.cos(Math.toRadians(b.getY())) *
                Math.cos(Math.toRadians(b.getX())-Math.toRadians(a.getX()))) * (double)EARTH_RADIUS_KM;
    }

static double de::psi::telco::sumoplayer::util::GeoCalc::geoDistanceM	(	Point	a,
		Point	b
	)			[inline, static]

Definition at line 18 of file GeoCalc.java.

References geoDistanceKm().

                                                       {
        return (geoDistanceKm(a, b)*1000);
    }

static double de::psi::telco::sumoplayer::util::GeoCalc::getLatOffset	(	double	lon,
		double	lat,
		int	meters
	)			[inline, static]

Definition at line 65 of file GeoCalc.java.

References KM_PER_LAT.

                                                                         {
        return (1.0/(KM_PER_LAT*1000))*meters;
    }

static double de::psi::telco::sumoplayer::util::GeoCalc::getLonOffset	(	double	lon,
		double	lat,
		int	meters
	)			[inline, static]

Definition at line 59 of file GeoCalc.java.

References KM_PER_LAT.

                                                                         {
        double latDelta = (1.0/(KM_PER_LAT*1000))*meters;
        double lonFact = Math.cos(Math.toRadians(lat));
        return latDelta*lonFact;
    }

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Field Documentation

final int de::psi::telco::sumoplayer::util::GeoCalc::EARTH_RADIUS_KM = 6371 [static]

Definition at line 8 of file GeoCalc.java.

Referenced by geoDistanceKm().

double de::psi::telco::sumoplayer::util::GeoCalc::KM_PER_LAT = 111.12 [static]

Definition at line 6 of file GeoCalc.java.

Referenced by getLatOffset(), and getLonOffset().

final double de::psi::telco::sumoplayer::util::GeoCalc::LATITUDE_PER_KM = 1.0/111.12 [static]

Definition at line 7 of file GeoCalc.java.

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The documentation for this class was generated from the following file:

• GeoCalc.java