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
33package com.jme3.scene.debug;
34
35import com.jme3.scene.Mesh;
36import com.jme3.scene.Mesh.Mode;
37import com.jme3.scene.VertexBuffer.Type;
38import com.jme3.util.BufferUtils;
39import java.nio.FloatBuffer;
40import java.nio.ShortBuffer;
41
42/**
43 * Simple grid shape.
44 *
45 * @author Kirill Vainer
46 */
47public 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