/**
 * The Rib inner class encapsulates information about the ribs of the SweepShape.
 * @author rdb
 *
 */

import org.joml.*;

public class Rib 
{
	private Vector3f[] poly;      // 3D version of the polygon 
	private Vector3f   normal;    // outward normal of rib
	private Vector3f   location;  // location in the sweep shape
	private Matrix4f   planeRotation;  // rotation to get (0,0,1) along normal
	private float	   xScale;    // xScale before rotation/translation
	private float	   yScale;    // yScale before rotation/translation
	private float      zRotate;   // rotation about the z-axis 
	
	private Matrix4f   transform;         // composite transform for all poly pts
	
	/**
	 * Constructor
	 */
	public Rib( Vector3f[] basePoly, Vector3f loc, Vector2f xyS, float zRot )
	{
		poly = new Vector3f[ basePoly.length ];
		location = new Vector3f( loc );
		zRotate = zRot;
		xScale = xyS.x;
		yScale = xyS.y;
        //----------------------------------------------
        //-------- need to compute the normal !!
		normal = new Vector3f( 0, 0, 1 );
        //-------- need to compute the planeRotation!!
		planeRotation = new Matrix4f();  // identity
        //---------------------------------------------
		transform = new Matrix4f().translate( location ) // default transform
				.mul( planeRotation )
				.rotate( zRotate, 0, 0, 1 )
				.scale( xScale, yScale, 1 );
		for ( int i = 0; i < basePoly.length; i++ )
			poly[ i ] = transform.transformPosition( basePoly[ i ], new Vector3f() );
	}
    //------------------ toString() --------------------------------------
    /**
     *  Useful to have a conversion to String method.
     */
	public String toString()
	{
		StringBuffer buf = new StringBuffer( "Rib: " );
		for ( Vector3f v: poly )
			buf.append( v + "  " );
		return buf.toString();
	}
}