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Added Knots <-> MMperSec conversions to AC35UnitConverter.

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Removed redundant/unused conversions.
Documented all of the conversions, and renamed them to pack/unpackX, to match the API spec.
Updated/added some tests in AC35UnitConverterTest.
RaceStatus now contains a Bearing instead of a packed int bearing.
RaceStatus now contains wind speed in knots, instead of MMperSec packed.
This means that only RaceStatus decoder/encoder need to care about the bits-over-wire packed values.
issue #35 #36
#story[1095]
This commit is contained in:
fjc40
2017-08-06 14:57:51 +12:00
parent a0f98eadaa
commit ff262a6227
9 changed files with 177 additions and 83 deletions
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racevisionGame/src/main/java/network/MessageDecoders/RaceStatusDecoder.java
+7 -3
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@@ -5,6 +5,8 @@ import network.Messages.BoatStatus;
import network.Messages.Enums.RaceStatusEnum;
import network.Messages.Enums.RaceTypeEnum;
import network.Messages.RaceStatus;
import network.Utils.AC35UnitConverter;
import shared.model.Bearing;
import java.util.ArrayList;
import java.util.Arrays;
@@ -65,10 +67,12 @@ public class RaceStatusDecoder {
long expectedStart = bytesToLong(expectedStartBytes);
byte[] windDirectionBytes = Arrays.copyOfRange(encodedMessage, 18, 20);
int windDirection = bytesToInt(windDirectionBytes);
int windDirectionInt = bytesToInt(windDirectionBytes);
Bearing windDirection = Bearing.fromDegrees(AC35UnitConverter.unpackHeading(windDirectionInt));
byte[] windSpeedBytes = Arrays.copyOfRange(encodedMessage, 20, 22);
short windSpeed = bytesToShort(windSpeedBytes);
int windSpeedInt = bytesToInt(windSpeedBytes);
double windSpeedKnots = AC35UnitConverter.unpackMMperSecToKnots(windSpeedInt);
byte[] numberOfBoatsBytes = Arrays.copyOfRange(encodedMessage, 22, 23);
int numberOfBoats = bytesToInt(numberOfBoatsBytes);
@@ -99,7 +103,7 @@ public class RaceStatusDecoder {
raceStatus,
expectedStart,
windDirection,
windSpeed,
windSpeedKnots,
raceType,
boatStatuses );
}
racevisionGame/src/main/java/network/MessageEncoders/RaceStatusEncoder.java
+7 -2
View File
@@ -4,10 +4,13 @@ package network.MessageEncoders;
import network.Messages.AC35Data;
import network.Messages.BoatStatus;
import network.Messages.RaceStatus;
import network.Utils.AC35UnitConverter;
import shared.model.Bearing;
import java.nio.ByteBuffer;
import java.util.List;
import static network.Utils.ByteConverter.bytesToInt;
import static network.Utils.ByteConverter.intToBytes;
import static network.Utils.ByteConverter.longToBytes;
@@ -52,10 +55,12 @@ public class RaceStatusEncoder implements MessageEncoder {
byte[] expectedStart = longToBytes(raceStatus.getExpectedStartTime(), 6);
//North = 0x0000 East = 0x4000 South = 0x8000.
byte[] raceWind = intToBytes(raceStatus.getWindDirection(), 2);
int windDirectionInt = AC35UnitConverter.packHeading(raceStatus.getWindDirection().degrees());
byte[] raceWind = intToBytes(windDirectionInt, 2);
//mm/sec
byte[] windSpeed = intToBytes(raceStatus.getWindSpeed(), 2);
int windSpeedInt = AC35UnitConverter.packKnotsToMMperSec(raceStatus.getWindSpeed());
byte[] windSpeed = intToBytes(windSpeedInt, 2);
byte[] numBoats = intToBytes(boatStatuses.size(), 1);
racevisionGame/src/main/java/network/Messages/BoatLocation.java
+8 -8
View File
@@ -5,8 +5,8 @@ import network.Messages.Enums.MessageType;
import network.Utils.AC35UnitConverter;
import shared.model.Constants;
import static network.Utils.AC35UnitConverter.convertGPS;
import static network.Utils.AC35UnitConverter.convertGPSToInt;
import static network.Utils.AC35UnitConverter.unpackGPS;
import static network.Utils.AC35UnitConverter.packGPS;
/**
* Represents the information in a boat location message (AC streaming spec: 4.9).
@@ -159,8 +159,8 @@ public class BoatLocation extends AC35Data {
this.sourceID = sourceID;
this.sequenceNumber = sequenceNumber;
this.deviceType = 1;
this.latitude = convertGPSToInt(lat);
this.longitude = convertGPSToInt(lon);
this.latitude = packGPS(lat);
this.longitude = packGPS(lon);
this.altitude = 0;
this.heading = convertHeadingDoubleToInt(heading);
this.pitch = 0;
@@ -340,11 +340,11 @@ public class BoatLocation extends AC35Data {
}
public double getLatitudeDouble(){
return convertGPS(this.latitude);
return unpackGPS(this.latitude);
}
public double getLongitudeDouble(){
return convertGPS(this.longitude);
return unpackGPS(this.longitude);
}
public void setLongitude(int longitude) {
@@ -474,11 +474,11 @@ public class BoatLocation extends AC35Data {
}
public double getHeadingDegrees(){
return AC35UnitConverter.convertHeading(getHeading());
return AC35UnitConverter.unpackHeading(getHeading());
}
public double getTrueWindAngleDegrees(){
return AC35UnitConverter.convertTrueWindAngle(getTrueWindAngle());
return AC35UnitConverter.unpackTrueWindAngle(getTrueWindAngle());
}
@Override
racevisionGame/src/main/java/network/Messages/RaceStatus.java
+12 -20
View File
@@ -5,6 +5,7 @@ import network.Messages.Enums.MessageType;
import network.Messages.Enums.RaceStatusEnum;
import network.Messages.Enums.RaceTypeEnum;
import network.Utils.AC35UnitConverter;
import shared.model.Bearing;
import shared.model.Constants;
import java.util.List;
@@ -51,12 +52,13 @@ public class RaceStatus extends AC35Data {
/**
* The wind direction of the course.
*/
private int windDirection;
private Bearing windDirection;
/**
* The wind speed of the course.
* Knots.
*/
private int windSpeed;
private double windSpeed;
/**
* The type of race this is.
@@ -78,11 +80,12 @@ public class RaceStatus extends AC35Data {
* @param raceStatus The status of the race.
* @param expectedStartTime The expected start time of the race.
* @param windDirection The current wind direction in the race.
* @param windSpeed The current wind speed in the race.
* @param windSpeed The current wind speed in the race, in knots.
* @param raceType The type of race this is.
* @param boatStatuses A list of BoatStatuses. One for each boat.
*/
public RaceStatus(byte messageVersionNumber, long currentTime, int raceID, RaceStatusEnum raceStatus, long expectedStartTime, int windDirection, int windSpeed, RaceTypeEnum raceType, List<BoatStatus> boatStatuses) {
public RaceStatus(byte messageVersionNumber, long currentTime, int raceID, RaceStatusEnum raceStatus, long expectedStartTime, Bearing windDirection, double windSpeed, RaceTypeEnum raceType, List<BoatStatus> boatStatuses) {
super(MessageType.RACESTATUS);
this.messageVersionNumber = messageVersionNumber;
this.currentTime = currentTime;
@@ -96,6 +99,7 @@ public class RaceStatus extends AC35Data {
}
/**
* Returns the version number of this message.
* @return The version number of the message.
@@ -144,16 +148,16 @@ public class RaceStatus extends AC35Data {
* Returns the current direction of the wind in the race.
* @return Current wind direction.
*/
public int getWindDirection()
public Bearing getWindDirection()
{
return windDirection;
}
/**
* Returns the wind speed for this race status, in millimeters per second.
* @return Wind speed in millimeters per second.
* Returns the wind speed for this race status, in knots.
* @return Wind speed in knots.
*/
public int getWindSpeed()
public double getWindSpeed()
{
return windSpeed;
}
@@ -221,16 +225,4 @@ public class RaceStatus extends AC35Data {
return raceStatus == RaceStatusEnum.PRESTART;
}
public double getScaledWindDirection() {
return AC35UnitConverter.convertHeading(windDirection);
}
/**
* Returns the wind speed for this race status, in knots.
* @return Wind speed in knots.
*/
public double getWindSpeedKnots() {
return (windSpeed / Constants.KnotsToMMPerSecond);
}
}
racevisionGame/src/main/java/network/Utils/AC35UnitConverter.java
+66 -21
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@@ -1,43 +1,88 @@
package network.Utils;
import shared.model.Constants;
/**
* Created by fwy13 on 28/04/17.
* Contains various unit conversion for encoding/decoding messages.
* Our program uses the "unpacked" units, and the over-the-wire format uses "packed" units (e.g., degrees stored as ints).
*/
public class AC35UnitConverter {
public static double convertGPS(int value){
//converts latitude or longitue to angle
/**
* Converts a packed GPSCoordinate (latitude or longitude) into the unpacked unit.
* @param value Packed lat/long value.
* @return Unpacked lat/long angle, in degrees.
*/
public static double unpackGPS(int value) {
return (double) value * 180.0 / 2147483648.0;//2^31 = 2147483648
}
public static int convertGPSToInt(double value){
//converts latitude or longitue to angle
/**
* Converts a latitude or longitude angle into a packed unit.
* @param value The lat/long angle, in degrees, to convert.
* @return The packed value.
*/
public static int packGPS(double value) {
return (int) (value * 2147483648.0/180.0);//2^31 = 2147483648
}
public static double convertHeading(long value){
return (double) value * 360.0/65536.0;//2^15
/**
* Unpacks a heading from an int to an angle in degrees (this is a bearing).
* @param value The packed value to unpack.
* @return The unpacked value in degrees.
*/
public static double unpackHeading(int value) {
return (value * 360.0 / 65536.0);//2^15
}
public static double convertHeading(int value){
return (double) value * 360.0/65536.0;//2^15
}
public static double convertHeading(double value){
return value * 360.0/65536.0;//2^15
}
public static int encodeHeading(int value){
/**
* Packs a heading (this is a bearing), in degrees, to a packed int value.
* @param value The heading in degrees.
* @return The packed value.
*/
public static int packHeading(double value) {
return (int) (value / 360.0 * 65536.0);//2^15
}
public static int encodeHeading(double value){
return (int) (value / 360.0 * 65536.0);//2^15
/**
* Unpacks a true wind angle from a short to an angle in degrees (this is an azimuth).
* @param value The packed value to unpack.
* @return The unpacked value in degrees.
*/
public static double unpackTrueWindAngle(short value) {
return (value * 180.0 / 32768.0);//-2^15 to 2^15
}
public static double convertTrueWindAngle(long value){
return (double) value * 180.0/32768.0;//-2^15 to 2^15
/**
* Packs a true wind angle (this is an azimuth) from an angle in degrees to a packed short value.
* @param value The unpacked value in degrees.
* @return The packed value.
*/
public static short packTrueWindAngle(double value) {
return (short) (value / 180.0 * 32768.0);//-2^15 to 2^15
}
/**
* Unpacks a speed, in millimeters per second, to a double, in knots.
* @param millimetersPerSec Speed in millimeters per second.
* @return Speed in knots.
*/
public static double unpackMMperSecToKnots(int millimetersPerSec) {
return (millimetersPerSec / Constants.KnotsToMMPerSecond);
}
/**
* Packs a speed, in knots, into an int, in millimeters per second.
* @param speedKnots Speed in knots.
* @return Speed in millimeters per second.
*/
public static int packKnotsToMMperSec(double speedKnots) {
return (int) (speedKnots * Constants.KnotsToMMPerSecond);
}
}