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      1 /*
      2  * Copyright (c) 2009-2010 jMonkeyEngine
      3  * All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions are
      7  * met:
      8  *
      9  * * Redistributions of source code must retain the above copyright
     10  *   notice, this list of conditions and the following disclaimer.
     11  *
     12  * * Redistributions in binary form must reproduce the above copyright
     13  *   notice, this list of conditions and the following disclaimer in the
     14  *   documentation and/or other materials provided with the distribution.
     15  *
     16  * * Neither the name of 'jMonkeyEngine' nor the names of its contributors
     17  *   may be used to endorse or promote products derived from this software
     18  *   without specific prior written permission.
     19  *
     20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     22  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     23  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
     24  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     25  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     26  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     27  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
     28  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
     29  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
     30  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     31  */
     32 
     33 package com.jme3.scene.debug;
     34 
     35 import com.jme3.scene.Mesh;
     36 import com.jme3.scene.Mesh.Mode;
     37 import com.jme3.scene.VertexBuffer.Type;
     38 import com.jme3.util.BufferUtils;
     39 import java.nio.FloatBuffer;
     40 import java.nio.ShortBuffer;
     41 
     42 /**
     43  * Simple grid shape.
     44  *
     45  * @author Kirill Vainer
     46  */
     47 public class Grid extends Mesh {
     48 
     49     /**
     50      * Creates a grid debug shape.
     51      * @param xLines
     52      * @param yLines
     53      * @param lineDist
     54      */
     55     public Grid(int xLines, int yLines, float lineDist){
     56         xLines -= 2;
     57         yLines -= 2;
     58         int lineCount = xLines + yLines + 4;
     59 
     60         FloatBuffer fpb = BufferUtils.createFloatBuffer(6 * lineCount);
     61         ShortBuffer sib = BufferUtils.createShortBuffer(2 * lineCount);
     62 
     63         float xLineLen = (yLines + 1) * lineDist;
     64         float yLineLen = (xLines + 1) * lineDist;
     65         int curIndex = 0;
     66 
     67         // add lines along X
     68         for (int i = 0; i < xLines + 2; i++){
     69             float y = (i) * lineDist;
     70 
     71             // positions
     72             fpb.put(0)       .put(0).put(y);
     73             fpb.put(xLineLen).put(0).put(y);
     74 
     75             // indices
     76             sib.put( (short) (curIndex++) );
     77             sib.put( (short) (curIndex++) );
     78         }
     79 
     80         // add lines along Y
     81         for (int i = 0; i < yLines + 2; i++){
     82             float x = (i) * lineDist;
     83 
     84             // positions
     85             fpb.put(x).put(0).put(0);
     86             fpb.put(x).put(0).put(yLineLen);
     87 
     88             // indices
     89             sib.put( (short) (curIndex++) );
     90             sib.put( (short) (curIndex++) );
     91         }
     92 
     93         fpb.flip();
     94         sib.flip();
     95 
     96         setBuffer(Type.Position, 3, fpb);
     97         setBuffer(Type.Index, 2, sib);
     98 
     99         setMode(Mode.Lines);
    100 
    101         updateBound();
    102         updateCounts();
    103     }
    104 
    105 }
    106