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76 lines
3.0 KiB
76 lines
3.0 KiB
package seng302.Model;
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import org.geotools.referencing.GeodeticCalculator;
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import seng302.Constants;
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import seng302.Controllers.RaceController;
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import seng302.GPSCoordinate;
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import java.awt.geom.Point2D;
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import java.util.ArrayList;
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/**
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* Created by cbt24 on 6/03/17.
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*/
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public class ConstantVelocityRace extends Race {
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/**
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* Initialiser for a constant velocity race
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*
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* @param startingBoats in race
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* @param legs in race
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* @param controller of race
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* @param scaleFactor of race
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*/
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public ConstantVelocityRace(BoatInRace[] startingBoats, ArrayList<Leg> legs, RaceController controller, int scaleFactor) {
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super(startingBoats, legs, controller, scaleFactor);
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}
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/**
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* Calculates the distance a boat has travelled and updates its current position according to this value.
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*
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* @param boat to be updated
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* @param millisecondsElapsed since last update
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*/
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protected void updatePosition(BoatInRace boat, int millisecondsElapsed) {
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//distanceTravelled = velocity (nm p hr) * time taken to update loop
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double distanceTravelled = (boat.getScaledVelocity() * millisecondsElapsed) / 3600000;
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double totalDistanceTravelled = distanceTravelled + boat.getDistanceTravelledInLeg();
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boolean finish = boat.getCurrentLeg().getName().equals("Finish");
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if (!finish) {
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//update boat's distance travelled
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boat.setDistanceTravelledInLeg(totalDistanceTravelled);
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//Calculate boat's new position by adding the distance travelled onto the start point of the leg
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boat.setCurrentPosition(calculatePosition(boat.getCurrentLeg().getStartMarker().getAverageGPSCoordinate(),
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totalDistanceTravelled, boat.calculateAzimuth()));
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}
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}
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/**
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* Calculates the boats next GPS position based on its distance travelled and heading
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*
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* @param oldCoordinates GPS coordinates of the boat's starting position
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* @param distanceTravelled distance in nautical miles
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* @param azimuth boat's current direction. Value between -180 and 180
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* @return The boat's new coordinate
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*/
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public static GPSCoordinate calculatePosition(GPSCoordinate oldCoordinates, double distanceTravelled, double azimuth) {
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//Find new coordinate using current heading and distance
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GeodeticCalculator geodeticCalculator = new GeodeticCalculator();
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//Load start point into calculator
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Point2D startPoint = new Point2D.Double(oldCoordinates.getLongitude(), oldCoordinates.getLatitude());
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geodeticCalculator.setStartingGeographicPoint(startPoint);
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//load direction and distance tranvelled into calculator
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geodeticCalculator.setDirection(azimuth, distanceTravelled * Constants.NMToMetersConversion);
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//get new point
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Point2D endPoint = geodeticCalculator.getDestinationGeographicPoint();
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return new GPSCoordinate(endPoint.getY(), endPoint.getX());
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}
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} |