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 */
32package com.jme3.scene.debug;
33
34import com.jme3.bounding.BoundingSphere;
35import com.jme3.math.FastMath;
36import com.jme3.scene.Mesh;
37import com.jme3.scene.Mesh.Mode;
38import com.jme3.scene.VertexBuffer;
39import com.jme3.scene.VertexBuffer.Format;
40import com.jme3.scene.VertexBuffer.Type;
41import com.jme3.scene.VertexBuffer.Usage;
42import com.jme3.util.BufferUtils;
43import java.nio.FloatBuffer;
44import java.nio.ShortBuffer;
45
46public class WireSphere extends Mesh {
47
48    private static final int samples = 30;
49    private static final int zSamples = 10;
50
51    public WireSphere() {
52        this(1);
53    }
54
55    public WireSphere(float radius) {
56        updatePositions(radius);
57        ShortBuffer ib = BufferUtils.createShortBuffer(samples * 2 * 2 + zSamples * samples * 2 /*+ 3 * 2*/);
58        setBuffer(Type.Index, 2, ib);
59
60//        ib.put(new byte[]{
61//            (byte) 0, (byte) 1,
62//            (byte) 2, (byte) 3,
63//            (byte) 4, (byte) 5,
64//        });
65
66//        int curNum = 3 * 2;
67        int curNum = 0;
68        for (int j = 0; j < 2 + zSamples; j++) {
69            for (int i = curNum; i < curNum + samples - 1; i++) {
70                ib.put((short) i).put((short) (i + 1));
71            }
72            ib.put((short) (curNum + samples - 1)).put((short) curNum);
73            curNum += samples;
74        }
75
76        setMode(Mode.Lines);
77
78        updateBound();
79        updateCounts();
80    }
81
82    public void updatePositions(float radius) {
83        VertexBuffer pvb = getBuffer(Type.Position);
84        FloatBuffer pb;
85
86        if (pvb == null) {
87            pvb = new VertexBuffer(Type.Position);
88            pb = BufferUtils.createVector3Buffer(samples * 2 + samples * zSamples /*+ 6 * 3*/);
89            pvb.setupData(Usage.Dynamic, 3, Format.Float, pb);
90            setBuffer(pvb);
91        } else {
92            pb = (FloatBuffer) pvb.getData();
93        }
94
95        pb.rewind();
96
97        // X axis
98//        pb.put(radius).put(0).put(0);
99//        pb.put(-radius).put(0).put(0);
100//
101//        // Y axis
102//        pb.put(0).put(radius).put(0);
103//        pb.put(0).put(-radius).put(0);
104//
105//        // Z axis
106//        pb.put(0).put(0).put(radius);
107//        pb.put(0).put(0).put(-radius);
108
109        float rate = FastMath.TWO_PI / (float) samples;
110        float angle = 0;
111        for (int i = 0; i < samples; i++) {
112            float x = radius * FastMath.cos(angle);
113            float y = radius * FastMath.sin(angle);
114            pb.put(x).put(y).put(0);
115            angle += rate;
116        }
117
118        angle = 0;
119        for (int i = 0; i < samples; i++) {
120            float x = radius * FastMath.cos(angle);
121            float y = radius * FastMath.sin(angle);
122            pb.put(0).put(x).put(y);
123            angle += rate;
124        }
125
126        float zRate = (radius * 2) / (float) (zSamples);
127        float zHeight = -radius + (zRate / 2f);
128
129
130        float rb = 1f / zSamples;
131        float b = rb / 2f;
132
133        for (int k = 0; k < zSamples; k++) {
134            angle = 0;
135            float scale = FastMath.sin(b * FastMath.PI);
136            for (int i = 0; i < samples; i++) {
137                float x = radius * FastMath.cos(angle);
138                float y = radius * FastMath.sin(angle);
139
140                pb.put(x * scale).put(zHeight).put(y * scale);
141
142                angle += rate;
143            }
144            zHeight += zRate;
145            b += rb;
146        }
147    }
148
149    /**
150     * Create a WireSphere from a BoundingSphere
151     *
152     * @param bsph
153     *     BoundingSphere used to create the WireSphere
154     *
155     */
156    public void fromBoundingSphere(BoundingSphere bsph) {
157        updatePositions(bsph.getRadius());
158    }
159}
160