1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
|
/*
* Copyright (c) Contributors, http://opensimulator.org/
* See CONTRIBUTORS.TXT for a full list of copyright holders.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the OpenSim Project nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
using System;
using System.Collections.Generic;
namespace libTerrain
{
partial class Channel
{
/// <summary>
/// Generates a Voronoi diagram (sort of a stained glass effect) which will fill the entire channel
/// </summary>
/// <remarks>3-Clause BSD Licensed</remarks>
/// <param name="pointsPerBlock">The number of generator points in each block</param>
/// <param name="blockSize">A multiple of the channel width and height which will have voronoi points generated in it.
/// <para>This is to ensure a more even distribution of the points than pure random allocation.</para></param>
/// <param name="c">The Voronoi diagram type. Usually an array with values consisting of [-1,1]. Experiment with the chain, you can have as many values as you like.</param>
public void VoronoiDiagram(int pointsPerBlock, int blockSize, double[] c)
{
SetDiff();
List<Point2D> points = new List<Point2D>();
Random generator = new Random(seed);
// Generate the emitter points
int x, y, i;
for (x = -blockSize; x < w + blockSize; x += blockSize)
{
for (y = -blockSize; y < h + blockSize; y += blockSize)
{
for (i = 0; i < pointsPerBlock; i++)
{
double pX = x + (generator.NextDouble()*(double) blockSize);
double pY = y + (generator.NextDouble()*(double) blockSize);
points.Add(new Point2D(pX, pY));
}
}
}
double[] distances = new double[points.Count];
// Calculate the distance each pixel is from an emitter
for (x = 0; x < w; x++)
{
for (y = 0; y < h; y++)
{
for (i = 0; i < points.Count; i++)
{
double dx, dy;
dx = Math.Abs((double) x - points[i].x);
dy = Math.Abs((double) y - points[i].y);
distances[i] = (dx*dx + dy*dy);
}
Array.Sort(distances);
double f = 0.0;
// Multiply the distances with their 'c' counterpart
// ordering the distances descending
for (i = 0; i < c.Length; i++)
{
if (i >= points.Count)
break;
f += c[i]*distances[i];
}
map[x, y] = f;
}
}
// Normalise the result
Normalise();
}
public void VoronoiDiagram(List<Point2D> points, double[] c)
{
SetDiff();
int x, y, i;
double[] distances = new double[points.Count];
// Calculate the distance each pixel is from an emitter
for (x = 0; x < w; x++)
{
for (y = 0; y < h; y++)
{
for (i = 0; i < points.Count; i++)
{
double dx, dy;
dx = Math.Abs((double) x - points[i].x);
dy = Math.Abs((double) y - points[i].y);
distances[i] = (dx*dx + dy*dy);
}
Array.Sort(distances);
double f = 0.0;
// Multiply the distances with their 'c' counterpart
// ordering the distances descending
for (i = 0; i < c.Length; i++)
{
if (i >= points.Count)
break;
f += c[i]*distances[i];
}
map[x, y] = f;
}
}
// Normalise the result
Normalise();
}
public void VoroflatDiagram(int pointsPerBlock, int blockSize)
{
SetDiff();
List<Point2D> points = new List<Point2D>();
Random generator = new Random(seed);
// Generate the emitter points
int x, y, i;
for (x = -blockSize; x < w + blockSize; x += blockSize)
{
for (y = -blockSize; y < h + blockSize; y += blockSize)
{
for (i = 0; i < pointsPerBlock; i++)
{
double pX = x + (generator.NextDouble()*(double) blockSize);
double pY = y + (generator.NextDouble()*(double) blockSize);
points.Add(new Point2D(pX, pY));
}
}
}
double[] distances = new double[points.Count];
// Calculate the distance each pixel is from an emitter
for (x = 0; x < w; x++)
{
for (y = 0; y < h; y++)
{
for (i = 0; i < points.Count; i++)
{
double dx, dy;
dx = Math.Abs((double) x - points[i].x);
dy = Math.Abs((double) y - points[i].y);
distances[i] = (dx*dx + dy*dy);
}
//Array.Sort(distances);
double f = 0.0;
double min = double.MaxValue;
for (int j = 0; j < distances.Length; j++)
{
if (distances[j] < min)
{
min = distances[j];
f = j;
}
}
// Multiply the distances with their 'c' counterpart
// ordering the distances descending
map[x, y] = f;
}
}
// Normalise the result
Normalise();
}
}
}
|