package class3_1_InheritanceVehicles_start;

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

    /** The vehicle's position */
    protected double northMeters;

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

    /** Create a vehicle 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) {
        this.northMeters = northMeters;
        this.northMetersPerSec = northMetersPerSec;
    }

    /**
     * Create a vehicle 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);
    }

    /**
     * Create a new vehicle located at the game center.
     * The vehicle will be moving north by default at about 10mph.
     */
    public Vehicle() {
        this(0);
    }

    public double getNorthMeters() {
        return northMeters;
    }

    void step() {
        northMeters += northMetersPerSec;
    }
}