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authorAdam Frisby2008-04-30 21:22:29 +0000
committerAdam Frisby2008-04-30 21:22:29 +0000
commit4a8c1e4393ac64c84b03aeb16bacb9ddd0a2fae6 (patch)
tree49dde0575502e89aeed428b4190c68306e929b69 /OpenSim/Region/Environment/Modules/World/Terrain/PaintBrushes/OlsenSphere.cs
parent* Previous commit managed to miss some files despite me hitting 'Select all'. (diff)
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* Commiting a bunch of missed files.
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diff --git a/OpenSim/Region/Environment/Modules/World/Terrain/PaintBrushes/OlsenSphere.cs b/OpenSim/Region/Environment/Modules/World/Terrain/PaintBrushes/OlsenSphere.cs
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1/*
2 * Copyright (c) Contributors, http://opensimulator.org/
3 * See CONTRIBUTORS.TXT for a full list of copyright holders.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 * * Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * * Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 * * Neither the name of the OpenSim Project nor the
13 * names of its contributors may be used to endorse or promote products
14 * derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
17 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
18 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
19 * DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
20 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
21 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
23 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
25 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28using System;
29using OpenSim.Region.Environment.Interfaces;
30
31namespace OpenSim.Region.Environment.Modules.World.Terrain.PaintBrushes
32{
33 /// <summary>
34 /// Speed-Optimised Hybrid Erosion Brush
35 ///
36 /// As per Jacob Olsen's Paper
37 /// http://www.oddlabs.com/download/terrain_generation.pdf
38 /// </summary>
39 public class OlsenSphere : ITerrainPaintableEffect
40 {
41 private double nConst = 1024.0;
42 private NeighbourSystem type = NeighbourSystem.Moore; // Parameter
43
44 #region Supporting Functions
45
46 private int[] Neighbours(NeighbourSystem type, int index)
47 {
48 int[] coord = new int[2];
49
50 index++;
51
52 switch (type)
53 {
54 case NeighbourSystem.Moore:
55 switch (index)
56 {
57 case 1:
58 coord[0] = -1;
59 coord[1] = -1;
60 break;
61
62 case 2:
63 coord[0] = -0;
64 coord[1] = -1;
65 break;
66
67 case 3:
68 coord[0] = +1;
69 coord[1] = -1;
70 break;
71
72 case 4:
73 coord[0] = -1;
74 coord[1] = -0;
75 break;
76
77 case 5:
78 coord[0] = -0;
79 coord[1] = -0;
80 break;
81
82 case 6:
83 coord[0] = +1;
84 coord[1] = -0;
85 break;
86
87 case 7:
88 coord[0] = -1;
89 coord[1] = +1;
90 break;
91
92 case 8:
93 coord[0] = -0;
94 coord[1] = +1;
95 break;
96
97 case 9:
98 coord[0] = +1;
99 coord[1] = +1;
100 break;
101
102 default:
103 break;
104 }
105 break;
106
107 case NeighbourSystem.VonNeumann:
108 switch (index)
109 {
110 case 1:
111 coord[0] = 0;
112 coord[1] = -1;
113 break;
114
115 case 2:
116 coord[0] = -1;
117 coord[1] = 0;
118 break;
119
120 case 3:
121 coord[0] = +1;
122 coord[1] = 0;
123 break;
124
125 case 4:
126 coord[0] = 0;
127 coord[1] = +1;
128 break;
129
130 case 5:
131 coord[0] = -0;
132 coord[1] = -0;
133 break;
134
135 default:
136 break;
137 }
138 break;
139 }
140
141 return coord;
142 }
143
144 private double SphericalFactor(double x, double y, double rx, double ry, double size)
145 {
146 double z = size * size - ((x - rx) * (x - rx) + (y - ry) * (y - ry));
147 return z;
148 }
149
150 private enum NeighbourSystem
151 {
152 Moore,
153 VonNeumann
154 } ;
155
156 #endregion
157
158 #region ITerrainPaintableEffect Members
159
160 public void PaintEffect(ITerrainChannel map, double rx, double ry, double strength, double duration)
161 {
162 strength = TerrainUtil.MetersToSphericalStrength(strength);
163
164 int x, y;
165
166 for (x = 0; x < map.Width; x++)
167 {
168 for (y = 0; y < map.Height; y++)
169 {
170 double z = SphericalFactor(x, y, rx, ry, strength);
171
172 if (z > 0) // add in non-zero amount
173 {
174 int NEIGHBOUR_ME = 4;
175 int NEIGHBOUR_MAX = type == NeighbourSystem.Moore ? 9 : 5;
176
177 double max = Double.MinValue;
178 int loc = 0;
179 double cellmax = 0;
180
181
182 for (int j = 0; j < NEIGHBOUR_MAX; j++)
183 {
184 if (j != NEIGHBOUR_ME)
185 {
186 int[] coords = Neighbours(type, j);
187
188 coords[0] += x;
189 coords[1] += y;
190
191 if (coords[0] > map.Width - 1)
192 continue;
193 if (coords[1] > map.Height - 1)
194 continue;
195 if (coords[0] < 0)
196 continue;
197 if (coords[1] < 0)
198 continue;
199
200 cellmax = map[x, y] - map[coords[0], coords[1]];
201 if (cellmax > max)
202 {
203 max = cellmax;
204 loc = j;
205 }
206 }
207 }
208
209 double T = nConst / ((map.Width + map.Height) / 2);
210 // Apply results
211 if (0 < max && max <= T)
212 {
213 int[] maxCoords = Neighbours(type, loc);
214 double heightDelta = 0.5 * max * z * duration;
215 map[x, y] -= heightDelta;
216 map[x + maxCoords[0], y + maxCoords[1]] += heightDelta;
217 }
218 }
219 }
220 }
221 }
222
223 #endregion
224 }
225} \ No newline at end of file
generated by cgit v1.1 at 2024-07-05 15:51:49 +0000