import java.io.Reader;
import java.io.Writer;

/**
 * Implementat ion of 
 * interface for specifying per-agent information neccessary to
 * perform formation morphing to morph to a rectangle with a 
 * "comb" topology.  Rect width is specified at construction time.
 * @author     Michael Schuresko
 * @version    %I%, %G%
 * @since      1.0 
 */
public class MorphSpecCardioid implements IMorphSpec 
{
    
    double m_lfDist;

    /**
     * defaults for the first demo
     */
    public MorphSpecCardioid() {
	m_lfDist = 0.2;
	
    }

    public MorphSpecCardioid(double lfSpacing) {
	m_lfDist = lfSpacing;
	
    }

    public double [] getFinalUv(int nAgentId)
    {
	double [] arrLfUv = new double[2];
	
	if(nAgentId == 0) {
	    arrLfUv[0] = arrLfUv[1] = 0.0;
	} else if(nAgentId <= 8) {
		double lfscaleDist = m_lfDist*(nAgentId);
	    arrLfUv[1] = lfscaleDist*Math.cos(0.25*(8-nAgentId)*0.125);
	    arrLfUv[0] = lfscaleDist*Math.sin(0.25*(8-nAgentId)*0.125);
	}
	else {
		double lfscaleDist = m_lfDist*(nAgentId-8);
	    arrLfUv[1] = lfscaleDist*Math.cos(0.25*(16-nAgentId)*0.125);
	    arrLfUv[0] = lfscaleDist*Math.sin(-0.25*(16-nAgentId)*0.125);
	}
	return arrLfUv;
    }

    public int getNumChildren(int nAgentId)
    {
	if(nAgentId == 0) {
	    return 2;
	}
	return 1;
    }

    public int getTopoLastVisit(int nAgentId)
    {
	if(nAgentId == 0) {
	    return 33;
	}
	if(nAgentId <= 8) {
	    return nAgentId + 2*(8-nAgentId)+1;
	}
	return 16+(nAgentId-8)+2*(8-(nAgentId-8))+1;
    }
    
    public int getTopoFirstVisit(int nAgentId)
    {
	if(nAgentId <= 8) {
	    return nAgentId;
	}
	return 16+nAgentId;
    }

    public int getTopoDepth(int nAgentId)
    {
	if(nAgentId <= 8) {
	    return nAgentId;
	}
	return (nAgentId-8);

    }
    
    /*
     * 8 is just a guess here
     * (non-Javadoc)
     * @see IMorphSpec#getMaxDepth()
     */
    public int getMaxDepth() { return 8; }
    
    /**
     * Make this more then a stub later
     */
    public void dump(Writer writeTo) {}
    /**
     * Make this more then a stub later
     */
    public void load(Reader readFrom) {}
}