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package example.boids;


class AlignRule
    implements BoidRule, BoidsConstants
{
    private int totalVx;
    private int totalVy;
    private int count;
    private Boid currentBoid;
    private static final int ALIGN_FACTOR = (1 << FIXED_POINT_SHIFT) / 8;


    AlignRule()
    {
    }


    public void reset(Boid boid)
    {
        totalVx = 0;
        totalVy = 0;
        count = 0;
        currentBoid = boid;
    }


    public void applyTo(Boid boid)
    {
        totalVx += boid.getVx();
        totalVy += boid.getVy();
        count++;
    }


    public int getVx()
    {
        int vx = 0;
        if (count > 0)
        {
            vx = ((totalVx / count) * ALIGN_FACTOR) >> FIXED_POINT_SHIFT;
        }
        return vx;
    }


    public int getVy()
    {
        int vy = 0;
        if (count > 0)
        {
            vy = ((totalVy / count) * ALIGN_FACTOR) >> FIXED_POINT_SHIFT;
        }
        return vy;
    }
}