package class3_1_InheritanceVehicles_start;

public class Vehicle {
    public static final int DEFAULT_NORTH_METERS_PER_SEC = 4;

    /** The car's position */
    private double northMeters;

    /** The car's speed */
    private double northMetersPerSec;

    /** Create a car at the specied position with the specified initial velocity
     *
     * @param northMeters position north of game center of vehicle's center of mass
     * @param northMetersPerSec velocity north of game center of vehicle's
     *                          center of mass, in m/s.
     */
    public Vehicle(double northMeters, double northMetersPerSec) {
        System.out.println("Vehicle(double,double): Constructing a vehicle at "
                +northMeters+ " m N going " + northMetersPerSec + " m/s");
        this.northMeters = northMeters;
        this.northMetersPerSec = northMetersPerSec;
    }

    /**
     * Create a car at the specified position.
     * The vehicle will be moving north by default at about 10mph
     * @param northMeters position north of game center of vehicle's center of mass
     */
    public Vehicle(double northMeters) {
        this(northMeters, DEFAULT_NORTH_METERS_PER_SEC);
        System.out.println("Vehicle(double): Constructing a vehicle at "
                +northMeters+ " m N");
    }

    public double getNorthMeters() {
        return northMeters;
    }

    /**
     * Step forward the simulation by one second.
     */
    public void step() {
        northMeters += northMetersPerSec;
    }

    @Override
    public String toString() {
        return "A vehicle at "+northMeters+ " meters north";
    }
}