Java_Programming_Coursera/src/Location.java at master · HVoltBb/Java_Programming_Coursera · GitHub

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* Licensed under the Apache License, Version 2.0 (the "License");

* you may not use this file except in compliance with the License.

* You may obtain a copy of the License at

* http://www.apache.org/licenses/LICENSE-2.0

* Unless required by applicable law or agreed to in writing, software

* distributed under the License is distributed on an "AS IS" BASIS,

* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

* See the License for the specific language governing permissions and

* limitations under the License.

* (same license as above)

* Revised on November 8, 2015 for use by Team Duke Software

* and hereby released with the same Apache 2.0 license

* Adoption consisting of removing all methods and fields that

* are Android specific so that the file compiles and can be used

* outside of Android. Also added constructor with Latitude and Longitude.

import java.text.DecimalFormat;

import java.util.StringTokenizer;

/**

* A data class representing a geographic location.

* A location can consist of a latitude, longitude, timestamp,

* and other information such as bearing, altitude and velocity.

* All locations generated by the {@link LocationManager} are

* guaranteed to have a valid latitude, longitude, and timestamp

* (both UTC time and elapsed real-time since boot), all other

* parameters are optional.

public class Location {

/**

* Constant used to specify formatting of a latitude or longitude

* in the form "[+-]DDD.DDDDD where D indicates degrees.

public static final int FORMAT_DEGREES = 0;

/**

* Constant used to specify formatting of a latitude or longitude

* in the form "[+-]DDD:MM.MMMMM" where D indicates degrees and

* M indicates minutes of arc (1 minute = 1/60th of a degree).

public static final int FORMAT_MINUTES = 1;

/**

* Constant used to specify formatting of a latitude or longitude

* in the form "DDD:MM:SS.SSSSS" where D indicates degrees, M

* indicates minutes of arc, and S indicates seconds of arc (1

* minute = 1/60th of a degree, 1 second = 1/3600th of a degree).

public static final int FORMAT_SECONDS = 2;

/**

* Bundle key for a version of the location that has been fed through

* LocationFudger. Allows location providers to flag locations as being

* safe for use with ACCESS_COARSE_LOCATION permission.

* @hide

public static final String EXTRA_COARSE_LOCATION = "coarseLocation";

/**

* Bundle key for a version of the location containing no GPS data.

* Allows location providers to flag locations as being safe to

* feed to LocationFudger.

* @hide

public static final String EXTRA_NO_GPS_LOCATION = "noGPSLocation";

private String mProvider;

private long mTime = 0;

private long mElapsedRealtimeNanos = 0;

private double mLatitude = 0.0;

private double mLongitude = 0.0;

private boolean mHasAltitude = false;

private double mAltitude = 0.0f;

private boolean mHasSpeed = false;

private float mSpeed = 0.0f;

private boolean mHasBearing = false;

private float mBearing = 0.0f;

private boolean mHasAccuracy = false;

private float mAccuracy = 0.0f;

private boolean mIsFromMockProvider = false;

// Cache the inputs and outputs of computeDistanceAndBearing

// so calls to distanceTo() and bearingTo() can share work

private double mLat1 = 0.0;

private double mLon1 = 0.0;

private double mLat2 = 0.0;

private double mLon2 = 0.0;

private float mDistance = 0.0f;

private float mInitialBearing = 0.0f;

// Scratchpad

private final float[] mResults = new float[2];

/**

* Construct a new Location with a named provider.

* By default time, latitude and longitude are 0, and the location

* has no bearing, altitude, speed, accuracy or extras.

* @param provider the name of the provider that generated this location

public Location(String provider) {

mProvider = provider;

}

/**

* Construct a new Location object that is copied from an existing one.

public Location(Location l) {

set(l);

}

public Location(double latitude, double longitude){

mLatitude = latitude;

mLongitude = longitude;

}

/**

* Sets the contents of the location to the values from the given location.

public void set(Location l) {

mProvider = l.mProvider;

mTime = l.mTime;

mElapsedRealtimeNanos = l.mElapsedRealtimeNanos;

mLatitude = l.mLatitude;

mLongitude = l.mLongitude;

mHasAltitude = l.mHasAltitude;

mAltitude = l.mAltitude;

mHasSpeed = l.mHasSpeed;

mSpeed = l.mSpeed;

mHasBearing = l.mHasBearing;

mBearing = l.mBearing;

mHasAccuracy = l.mHasAccuracy;

mAccuracy = l.mAccuracy;

mIsFromMockProvider = l.mIsFromMockProvider;

}

/**

* Clears the contents of the location.

public void reset() {

mProvider = null;

mTime = 0;

mElapsedRealtimeNanos = 0;

mLatitude = 0;

mLongitude = 0;

mHasAltitude = false;

mAltitude = 0;

mHasSpeed = false;

mSpeed = 0;

mHasBearing = false;

mBearing = 0;

mHasAccuracy = false;

mAccuracy = 0;

mIsFromMockProvider = false;

}

/**

* Converts a coordinate to a String representation. The outputType

* may be one of FORMAT_DEGREES, FORMAT_MINUTES, or FORMAT_SECONDS.

* The coordinate must be a valid double between -180.0 and 180.0.

* @throws IllegalArgumentException if coordinate is less than

* -180.0, greater than 180.0, or is not a number.

* @throws IllegalArgumentException if outputType is not one of

* FORMAT_DEGREES, FORMAT_MINUTES, or FORMAT_SECONDS.

public static String convert(double coordinate, int outputType) {

if (coordinate < -180.0 || coordinate > 180.0 ||

Double.isNaN(coordinate)) {

throw new IllegalArgumentException("coordinate=" + coordinate);

}

if ((outputType != FORMAT_DEGREES) &&

(outputType != FORMAT_MINUTES) &&

(outputType != FORMAT_SECONDS)) {

throw new IllegalArgumentException("outputType=" + outputType);

}

StringBuilder sb = new StringBuilder();

// Handle negative values

if (coordinate < 0) {

sb.append('-');

coordinate = -coordinate;

}

DecimalFormat df = new DecimalFormat("###.#####");

if (outputType == FORMAT_MINUTES || outputType == FORMAT_SECONDS) {

int degrees = (int) Math.floor(coordinate);

sb.append(degrees);

sb.append(':');

coordinate -= degrees;

coordinate *= 60.0;

if (outputType == FORMAT_SECONDS) {

int minutes = (int) Math.floor(coordinate);

sb.append(minutes);

sb.append(':');

coordinate -= minutes;

coordinate *= 60.0;

}

sb.append(df.format(coordinate));

return sb.toString();

}

/**

* Converts a String in one of the formats described by

* FORMAT_DEGREES, FORMAT_MINUTES, or FORMAT_SECONDS into a

* double.

* @throws NullPointerException if coordinate is null

* @throws IllegalArgumentException if the coordinate is not

* in one of the valid formats.

public static double convert(String coordinate) {

// IllegalArgumentException if bad syntax

if (coordinate == null) {

throw new NullPointerException("coordinate");

}

boolean negative = false;

if (coordinate.charAt(0) == '-') {

coordinate = coordinate.substring(1);

negative = true;

}

StringTokenizer st = new StringTokenizer(coordinate, ":");

int tokens = st.countTokens();

if (tokens < 1) {

throw new IllegalArgumentException("coordinate=" + coordinate);

}

try {

String degrees = st.nextToken();

double val;

if (tokens == 1) {

val = Double.parseDouble(degrees);

return negative ? -val : val;

}

String minutes = st.nextToken();

int deg = Integer.parseInt(degrees);

double min;

double sec = 0.0;

if (st.hasMoreTokens()) {

min = Integer.parseInt(minutes);

String seconds = st.nextToken();

sec = Double.parseDouble(seconds);

} else {

min = Double.parseDouble(minutes);

}

boolean isNegative180 = negative && (deg == 180) &&

(min == 0) && (sec == 0);

// deg must be in [0, 179] except for the case of -180 degrees

if ((deg < 0.0) || (deg > 179 && !isNegative180)) {

throw new IllegalArgumentException("coordinate=" + coordinate);

}

if (min < 0 || min > 59) {

throw new IllegalArgumentException("coordinate=" +

coordinate);

}

if (sec < 0 || sec > 59) {

throw new IllegalArgumentException("coordinate=" +

coordinate);

}

val = deg*3600.0 + min*60.0 + sec;

val /= 3600.0;

return negative ? -val : val;

} catch (NumberFormatException nfe) {

throw new IllegalArgumentException("coordinate=" + coordinate);

}

private static void computeDistanceAndBearing(double lat1, double lon1,

double lat2, double lon2, float[] results) {

// Based on http://www.ngs.noaa.gov/PUBS_LIB/inverse.pdf

// using the "Inverse Formula" (section 4)

int MAXITERS = 20;

// Convert lat/long to radians

lat1 *= Math.PI / 180.0;

lat2 *= Math.PI / 180.0;

lon1 *= Math.PI / 180.0;

lon2 *= Math.PI / 180.0;

double a = 6378137.0; // WGS84 major axis

double b = 6356752.3142; // WGS84 semi-major axis

double f = (a - b) / a;

double aSqMinusBSqOverBSq = (a * a - b * b) / (b * b);

double L = lon2 - lon1;

double A = 0.0;

double U1 = Math.atan((1.0 - f) * Math.tan(lat1));

double U2 = Math.atan((1.0 - f) * Math.tan(lat2));

double cosU1 = Math.cos(U1);

double cosU2 = Math.cos(U2);

double sinU1 = Math.sin(U1);

double sinU2 = Math.sin(U2);

double cosU1cosU2 = cosU1 * cosU2;

double sinU1sinU2 = sinU1 * sinU2;

double sigma = 0.0;

double deltaSigma = 0.0;

double cosSqAlpha = 0.0;

double cos2SM = 0.0;

double cosSigma = 0.0;

double sinSigma = 0.0;

double cosLambda = 0.0;

double sinLambda = 0.0;

double lambda = L; // initial guess

for (int iter = 0; iter < MAXITERS; iter++) {

double lambdaOrig = lambda;

cosLambda = Math.cos(lambda);

sinLambda = Math.sin(lambda);

double t1 = cosU2 * sinLambda;

double t2 = cosU1 * sinU2 - sinU1 * cosU2 * cosLambda;

double sinSqSigma = t1 * t1 + t2 * t2; // (14)

sinSigma = Math.sqrt(sinSqSigma);

cosSigma = sinU1sinU2 + cosU1cosU2 * cosLambda; // (15)

sigma = Math.atan2(sinSigma, cosSigma); // (16)

double sinAlpha = (sinSigma == 0) ? 0.0 :

cosU1cosU2 * sinLambda / sinSigma; // (17)

cosSqAlpha = 1.0 - sinAlpha * sinAlpha;

cos2SM = (cosSqAlpha == 0) ? 0.0 :

cosSigma - 2.0 * sinU1sinU2 / cosSqAlpha; // (18)

double uSquared = cosSqAlpha * aSqMinusBSqOverBSq; // defn

A = 1 + (uSquared / 16384.0) * // (3)

(4096.0 + uSquared *

(-768 + uSquared * (320.0 - 175.0 * uSquared)));

double B = (uSquared / 1024.0) * // (4)

(256.0 + uSquared *

(-128.0 + uSquared * (74.0 - 47.0 * uSquared)));

double C = (f / 16.0) *

cosSqAlpha *

(4.0 + f * (4.0 - 3.0 * cosSqAlpha)); // (10)

double cos2SMSq = cos2SM * cos2SM;

deltaSigma = B * sinSigma * // (6)

(cos2SM + (B / 4.0) *

(cosSigma * (-1.0 + 2.0 * cos2SMSq) -

(B / 6.0) * cos2SM *

(-3.0 + 4.0 * sinSigma * sinSigma) *

(-3.0 + 4.0 * cos2SMSq)));

lambda = L +

(1.0 - C) * f * sinAlpha *

(sigma + C * sinSigma *

(cos2SM + C * cosSigma *

(-1.0 + 2.0 * cos2SM * cos2SM))); // (11)

double delta = (lambda - lambdaOrig) / lambda;

if (Math.abs(delta) < 1.0e-12) {

break;

}

float distance = (float) (b * A * (sigma - deltaSigma));

results[0] = distance;

if (results.length > 1) {

float initialBearing = (float) Math.atan2(cosU2 * sinLambda,

cosU1 * sinU2 - sinU1 * cosU2 * cosLambda);

initialBearing *= 180.0 / Math.PI;

results[1] = initialBearing;

if (results.length > 2) {

float finalBearing = (float) Math.atan2(cosU1 * sinLambda,

-sinU1 * cosU2 + cosU1 * sinU2 * cosLambda);

finalBearing *= 180.0 / Math.PI;

results[2] = finalBearing;

}

/**

* Computes the approximate distance in meters between two

* locations, and optionally the initial and final bearings of the

* shortest path between them. Distance and bearing are defined using the

* WGS84 ellipsoid.

* The computed distance is stored in results[0]. If results has length

* 2 or greater, the initial bearing is stored in results[1]. If results has

* length 3 or greater, the final bearing is stored in results[2].

* @param startLatitude the starting latitude

* @param startLongitude the starting longitude

* @param endLatitude the ending latitude

* @param endLongitude the ending longitude

* @param results an array of floats to hold the results

* @throws IllegalArgumentException if results is null or has length < 1

public static void distanceBetween(double startLatitude, double startLongitude,

double endLatitude, double endLongitude, float[] results) {

if (results == null || results.length < 1) {

throw new IllegalArgumentException("results is null or has length < 1");

}

computeDistanceAndBearing(startLatitude, startLongitude,

endLatitude, endLongitude, results);

}

/**

* Returns the approximate distance in meters between this

* location and the given location. Distance is defined using

* the WGS84 ellipsoid.

* @param dest the destination location

* @return the approximate distance in meters

public float distanceTo(Location dest) {

// See if we already have the result

synchronized (mResults) {

if (mLatitude != mLat1 || mLongitude != mLon1 ||

dest.mLatitude != mLat2 || dest.mLongitude != mLon2) {

computeDistanceAndBearing(mLatitude, mLongitude,

dest.mLatitude, dest.mLongitude, mResults);

mLat1 = mLatitude;

mLon1 = mLongitude;

mLat2 = dest.mLatitude;

mLon2 = dest.mLongitude;

mDistance = mResults[0];

mInitialBearing = mResults[1];

}

return mDistance;

}

/**

* Returns the approximate initial bearing in degrees East of true

* North when traveling along the shortest path between this

* location and the given location. The shortest path is defined

* using the WGS84 ellipsoid. Locations that are (nearly)

* antipodal may produce meaningless results.

* @param dest the destination location

* @return the initial bearing in degrees

public float bearingTo(Location dest) {

synchronized (mResults) {

// See if we already have the result

if (mLatitude != mLat1 || mLongitude != mLon1 ||

dest.mLatitude != mLat2 || dest.mLongitude != mLon2) {

computeDistanceAndBearing(mLatitude, mLongitude,

dest.mLatitude, dest.mLongitude, mResults);

mLat1 = mLatitude;

mLon1 = mLongitude;

mLat2 = dest.mLatitude;

mLon2 = dest.mLongitude;

mDistance = mResults[0];

mInitialBearing = mResults[1];

}

return mInitialBearing;

}

/**

* Returns the name of the provider that generated this fix.

* @return the provider, or null if it has not been set

public String getProvider() {

return mProvider;

}

/**

* Sets the name of the provider that generated this fix.

public void setProvider(String provider) {

mProvider = provider;

}

/**

* Return the UTC time of this fix, in milliseconds since January 1, 1970.

* Note that the UTC time on a device is not monotonic: it

* can jump forwards or backwards unpredictably. So always use

* {@link #getElapsedRealtimeNanos} when calculating time deltas.

* On the other hand, {@link #getTime} is useful for presenting

* a human readable time to the user, or for carefully comparing

* location fixes across reboot or across devices.

* All locations generated by the {@link LocationManager}

* are guaranteed to have a valid UTC time, however remember that

* the system time may have changed since the location was generated.

* @return time of fix, in milliseconds since January 1, 1970.

public long getTime() {

return mTime;

}

/**

* Set the UTC time of this fix, in milliseconds since January 1,

* 1970.

* @param time UTC time of this fix, in milliseconds since January 1, 1970

public void setTime(long time) {

mTime = time;

}

/**

* Return the time of this fix, in elapsed real-time since system boot.

* This value can be reliably compared to

* {@link android.os.SystemClock#elapsedRealtimeNanos},

* to calculate the age of a fix and to compare Location fixes. This

* is reliable because elapsed real-time is guaranteed monotonic for

* each system boot and continues to increment even when the system

* is in deep sleep (unlike {@link #getTime}.

* All locations generated by the {@link LocationManager}

* are guaranteed to have a valid elapsed real-time.

* @return elapsed real-time of fix, in nanoseconds since system boot.

public long getElapsedRealtimeNanos() {

return mElapsedRealtimeNanos;

}

/**

* Set the time of this fix, in elapsed real-time since system boot.

* @param time elapsed real-time of fix, in nanoseconds since system boot.

public void setElapsedRealtimeNanos(long time) {

mElapsedRealtimeNanos = time;

}

/**

* Get the latitude, in degrees.

* All locations generated by the {@link LocationManager}

* will have a valid latitude.

public double getLatitude() {

return mLatitude;

}

/**

* Set the latitude, in degrees.

public void setLatitude(double latitude) {

mLatitude = latitude;

}

/**

* Get the longitude, in degrees.

* All locations generated by the {@link LocationManager}

* will have a valid longitude.

public double getLongitude() {

return mLongitude;

}

/**

* Set the longitude, in degrees.

public void setLongitude(double longitude) {

mLongitude = longitude;

}

/**

* True if this location has an altitude.

public boolean hasAltitude() {

return mHasAltitude;

}

/**

* Get the altitude if available, in meters above the WGS 84 reference

* ellipsoid.

* If this location does not have an altitude then 0.0 is returned.

public double getAltitude() {

return mAltitude;

}

/**

* Set the altitude, in meters above the WGS 84 reference ellipsoid.

* Following this call {@link #hasAltitude} will return true.

public void setAltitude(double altitude) {

mAltitude = altitude;

mHasAltitude = true;

}

/**

* Remove the altitude from this location.

* Following this call {@link #hasAltitude} will return false,

* and {@link #getAltitude} will return 0.0.

public void removeAltitude() {

mAltitude = 0.0f;

mHasAltitude = false;

}

/**

* True if this location has a speed.

public boolean hasSpeed() {

return mHasSpeed;

}

/**

* Get the speed if it is available, in meters/second over ground.

* If this location does not have a speed then 0.0 is returned.

public float getSpeed() {

return mSpeed;

}

/**

* Set the speed, in meters/second over ground.

* Following this call {@link #hasSpeed} will return true.

public void setSpeed(float speed) {

mSpeed = speed;

mHasSpeed = true;

}

/**

* Remove the speed from this location.

* Following this call {@link #hasSpeed} will return false,

* and {@link #getSpeed} will return 0.0.

public void removeSpeed() {

mSpeed = 0.0f;

mHasSpeed = false;

}

/**

* True if this location has a bearing.

public boolean hasBearing() {

return mHasBearing;

}

/**

* Get the bearing, in degrees.

* Bearing is the horizontal direction of travel of this device,

* and is not related to the device orientation. It is guaranteed to

* be in the range (0.0, 360.0] if the device has a bearing.

* If this location does not have a bearing then 0.0 is returned.

public float getBearing() {

return mBearing;

}

/**

* Set the bearing, in degrees.

* Bearing is the horizontal direction of travel of this device,

* and is not related to the device orientation.

* The input will be wrapped into the range (0.0, 360.0].

public void setBearing(float bearing) {

while (bearing < 0.0f) {

bearing += 360.0f;

}

while (bearing >= 360.0f) {

bearing -= 360.0f;

}

mBearing = bearing;

mHasBearing = true;

}

/**

* Remove the bearing from this location.

* Following this call {@link #hasBearing} will return false,

* and {@link #getBearing} will return 0.0.

public void removeBearing() {

mBearing = 0.0f;

mHasBearing = false;

}

/**

* True if this location has an accuracy.

* All locations generated by the {@link LocationManager} have an

* accuracy.

public boolean hasAccuracy() {

return mHasAccuracy;

}

/**

* Get the estimated accuracy of this location, in meters.

* We define accuracy as the radius of 68% confidence. In other

* words, if you draw a circle centered at this location's

* latitude and longitude, and with a radius equal to the accuracy,

* then there is a 68% probability that the true location is inside

* the circle.

* In statistical terms, it is assumed that location errors

* are random with a normal distribution, so the 68% confidence circle

* represents one standard deviation. Note that in practice, location

* errors do not always follow such a simple distribution.

* This accuracy estimation is only concerned with horizontal

* accuracy, and does not indicate the accuracy of bearing,

* velocity or altitude if those are included in this Location.

* If this location does not have an accuracy, then 0.0 is returned.

* All locations generated by the {@link LocationManager} include

* an accuracy.

public float getAccuracy() {

return mAccuracy;

}

/**

* Set the estimated accuracy of this location, meters.

* See {@link #getAccuracy} for the definition of accuracy.

* Following this call {@link #hasAccuracy} will return true.

public void setAccuracy(float accuracy) {

mAccuracy = accuracy;

mHasAccuracy = true;

}

/**

* Remove the accuracy from this location.

* Following this call {@link #hasAccuracy} will return false, and

* {@link #getAccuracy} will return 0.0.

public void removeAccuracy() {

mAccuracy = 0.0f;

mHasAccuracy = false;

}

@Override

public String toString() {

StringBuilder s = new StringBuilder();

s.append("Location[");

s.append(mProvider);

s.append(String.format(" %.6f,%.6f", mLatitude, mLongitude));

if (mHasAccuracy) s.append(String.format(" acc=%.0f", mAccuracy));

else s.append(" acc=???");

if (mTime == 0) {

s.append(" t=?!?");

}

if (mHasAltitude) s.append(" alt=").append(mAltitude);

if (mHasSpeed) s.append(" vel=").append(mSpeed);

if (mHasBearing) s.append(" bear=").append(mBearing);

if (mIsFromMockProvider) s.append(" mock");

s.append(']');

return s.toString();

}

Java_Programming_Coursera/src/Location.java at master · HVoltBb/Java_Programming_Coursera · GitHub

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