/*
 * This code is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public 
 * License as published by the Free Software Foundation; either 
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public 
 * License along with this program; if not, write to the Free 
 * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, 
 * MA  02111-1307, USA.
 */
package no.geosoft.cc.geometry.spline;



/**
 * A spline factory instance.
 * 
 * @author <a href="mailto:jacob.dreyer@geosoft.no">Jacob Dreyer</a>
 */   
public class SplineFactory
{
  /**
   * Create a Bezier spline based on the given control points.
   * The generated curve starts in the first control point and ends
   * in the last control point.
   * 
   * @param controlPoints  Control points of spline (x0,y0,z0,x1,y1,z1,...).
   * @param nParts         Number of parts to divide each leg into.
   * @return               Spline (x0,y0,z0,x1,y1,z1,...).
   */
  public static double[] createBezier (double[] controlPoints, int nParts)
  {
    Spline spline = new BezierSpline (controlPoints, nParts);
    return spline.generate();
  }


  
  /**
   * Create a cubic spline based on the given control points.
   * The generated curve starts in the first control point and ends
   * in the last control point.
   * 
   * @param controlPoints  Control points of spline (x0,y0,z0,x1,y1,z1,...).
   * @param nParts         Number of parts to divide each leg into.
   * @return               Spline (x0,y0,z0,x1,y1,z1,...).
   */
  public static double[] createCubic (double[] controlPoints, int nParts)
  {
    Spline spline = new CubicSpline (controlPoints, nParts);
    return spline.generate();
  }


  
  /**
   * Create a Catmull-Rom spline based on the given control points.
   * The generated curve starts in the first control point and ends
   * in the last control point.
   * Im addition, the curve intersects all the control points.
   * 
   * @param controlPoints  Control points of spline (x0,y0,z0,x1,y1,z1,...).
   * @param nParts         Number of parts to divide each leg into.
   * @return               Spline (x0,y0,z0,x1,y1,z1,...).
   */
  public static double[] createCatmullRom (double[] controlPoints, int nParts)
  {
    Spline spline = new CatmullRomSpline (controlPoints, nParts);
    return spline.generate();
  }


  
  /**
   * Testing the spline package.
   * 
   * @param args  Not used.
   */
  public static void main (String[] args)
  {
    double[] c = new double[12];
    c[0]  =   0.0;  // x0
    c[1]  =   0.0;  // y0
    c[2]  =   0.0;  // z0      
    
    c[3]  =   1.0;  // x1
    c[4]  =   1.0;  // y1
    c[5]  =   0.0;  // z1      

    c[6]  =   2.0;  // x2
    c[7]  =  -1.0;  // y2
    c[8]  =   0.0;  // z2      

    c[9]  =  10.0;  // x3
    c[10] =   0.0;  // y3
    c[11] =   0.0;  // z3      

    double[] spline1 = SplineFactory.createBezier (c,     20);
    double[] spline2 = SplineFactory.createCubic (c,      20);
    double[] spline3 = SplineFactory.createCatmullRom (c, 20);        

    System.out.println ("-- Bezier");
    for (int i = 0; i < spline1.length; i+=3)
      System.out.println (spline1[i] + "," + spline1[i+1] + "," + spline1[i+2]);
    
    System.out.println ("-- Cubic");
    for (int i = 0; i < spline2.length; i+=3)
      System.out.println (spline2[i] + "," + spline2[i+1] + "," + spline2[i+2]);

    System.out.println ("-- Catmull-Rom");
    for (int i = 0; i < spline3.length; i+=3)
      System.out.println (spline3[i] + "," + spline3[i+1] + "," + spline3[i+2]);
  }
}