MeshSection.java :  » Java-3D » shapes3d4processing » shapes3d » utils » Java Open Source

/*
  Part of the Shapes 3D library for Processing 
    http://www.lagers.org.uk

  Copyright (c) 2010 Peter Lager

  This library 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 library 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 library; if not, write to the
  Free Software Foundation, Inc., 59 Temple Place, Suite 330,
  Boston, MA  02111-1307  USA
 */

package shapes3d.utils;

import processing.core.PApplet;

/**
 * Utility class to specify which part of the mesh to be drawn. <br>
 * 
 * Only applies to classes that inherit from Mesh2DCore i.e. BezierShape, Ellipsoid,
 * Helix, Tube and Toroid.  
 * 
 * @author Peter Lager
 *
 */
public class MeshSection {

  private int ewSteps, nsSteps;
  public int sEW, eEW, sNS, eNS;
  
  @SuppressWarnings("unused")
  private MeshSection(){}
  
  /**
   * Create a mesh section based on number of steps.
   * @param ewSteps
   * @param nsSteps
   */
  public MeshSection(int ewSteps, int nsSteps) {
    this.ewSteps = ewSteps;
    this.nsSteps = nsSteps;
    sEW = sNS = 0;
    eEW = ewSteps;
    eNS = nsSteps;
  }
  
  /**
   * All parameters will be capped to the range >=0 and <= 1 and
   * where necessary swapped so start < end position
   * 
   * @param ewStart
   * @param ewEnd
   * @param nsStart
   * @param nsEnd
   */
  public void setRange(float ewStart, float ewEnd, float nsStart, float nsEnd){
    float temp = 0;
    
    ewStart = PApplet.constrain(ewStart , 0.0f, 0.999f);
    ewEnd = PApplet.constrain(ewEnd, 0.0f, 0.999f);
    nsStart = PApplet.constrain(nsStart, 0.0f, 0.999f);
    nsEnd = PApplet.constrain(nsEnd, 0.0f, 0.999f);

    if(ewStart > ewEnd){
      temp = ewStart; ewStart = ewEnd; ewEnd = temp;
    }      
    if(nsStart > nsEnd){
      temp = nsStart; nsStart = nsEnd; nsEnd = temp;
    }

    sEW = (int)(ewStart * (ewSteps));
    eEW = ewSteps - (int)((1-ewEnd) * (ewSteps));
    sNS = (int)(nsStart * (nsSteps));
    eNS = nsSteps - (int)((1-nsEnd) * (nsSteps));
  }

  /**
   * All parameters will be capped to the range >=0 and < ewPieces / nsPieces and
   * where necessary swapped so start < end position
   * 
   * @param ewStartPiece
   * @param ewEndPiece
   * @param nsStartPiece
   * @param nsEndPiece
   */
  public void setRange(int ewStartPiece, int ewEndPiece, int nsStartPiece, int nsEndPiece){
    int temp = 0;
    
    System.out.println("(a) "+ewStartPiece+" "+ewEndPiece+"    "+nsStartPiece+" "+nsEndPiece);  
    ewStartPiece = PApplet.constrain(ewStartPiece , 0, ewSteps - 2);
    ewEndPiece = PApplet.constrain(ewEndPiece, 0, ewSteps - 2);
    nsStartPiece = PApplet.constrain(nsStartPiece, 0, nsSteps - 2);
    nsEndPiece = PApplet.constrain(nsEndPiece, 0, nsSteps - 2);

    System.out.println("(b) "+ewStartPiece+" "+ewEndPiece+"    "+nsStartPiece+" "+nsEndPiece);  

    if(ewStartPiece > ewEndPiece){
      temp = ewStartPiece; ewStartPiece = ewEndPiece; ewEndPiece = temp;
    }
    if(nsStartPiece > nsEndPiece){
      temp = nsStartPiece; nsStartPiece = nsEndPiece; nsEndPiece = temp;
    }

    System.out.println("(c) "+ewStartPiece+" "+ewEndPiece+"    "+nsStartPiece+" "+nsEndPiece);  

    sEW = ewStartPiece;
    eEW = ewEndPiece + 2;
    sNS = nsStartPiece;
    eNS = nsEndPiece + 2;
//    System.out.println("(d) "+this);  
  }
  
  public String toString(){
    return "Section2D ["+sEW+" "+eEW+"]  ["+sNS+" "+eNS+"]";
  }
}