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
|
package org.bukkit.util.noise;
/**
* Base class for all noise generators
*/
public abstract class NoiseGenerator {
protected final int perm[] = new int[512];
protected double offsetX;
protected double offsetY;
protected double offsetZ;
/**
* Speedy floor, faster than (int)Math.floor(x)
*
* @param x Value to floor
* @return Floored value
*/
public static int floor(double x) {
return x >= 0 ? (int) x : (int) x - 1;
}
protected static double fade(double x) {
return x * x * x * (x * (x * 6 - 15) + 10);
}
protected static double lerp(double x, double y, double z) {
return y + x * (z - y);
}
protected static double grad(int hash, double x, double y, double z) {
hash &= 15;
double u = hash < 8 ? x : y;
double v = hash < 4 ? y : hash == 12 || hash == 14 ? x : z;
return ((hash & 1) == 0 ? u : -u) + ((hash & 2) == 0 ? v : -v);
}
/**
* Computes and returns the 1D noise for the given coordinate in 1D space
*
* @param x X coordinate
* @return Noise at given location, from range -1 to 1
*/
public double noise(double x) {
return noise(x, 0, 0);
}
/**
* Computes and returns the 2D noise for the given coordinates in 2D space
*
* @param x X coordinate
* @param y Y coordinate
* @return Noise at given location, from range -1 to 1
*/
public double noise(double x, double y) {
return noise(x, y, 0);
}
/**
* Computes and returns the 3D noise for the given coordinates in 3D space
*
* @param x X coordinate
* @param y Y coordinate
* @param z Z coordinate
* @return Noise at given location, from range -1 to 1
*/
public abstract double noise(double x, double y, double z);
/**
* Generates noise for the 1D coordinates using the specified number of
* octaves and parameters
*
* @param x X-coordinate
* @param octaves Number of octaves to use
* @param frequency How much to alter the frequency by each octave
* @param amplitude How much to alter the amplitude by each octave
* @return Resulting noise
*/
public double noise(double x, int octaves, double frequency, double amplitude) {
return noise(x, 0, 0, octaves, frequency, amplitude);
}
/**
* Generates noise for the 1D coordinates using the specified number of
* octaves and parameters
*
* @param x X-coordinate
* @param octaves Number of octaves to use
* @param frequency How much to alter the frequency by each octave
* @param amplitude How much to alter the amplitude by each octave
* @param normalized If true, normalize the value to [-1, 1]
* @return Resulting noise
*/
public double noise(double x, int octaves, double frequency, double amplitude, boolean normalized) {
return noise(x, 0, 0, octaves, frequency, amplitude, normalized);
}
/**
* Generates noise for the 2D coordinates using the specified number of
* octaves and parameters
*
* @param x X-coordinate
* @param y Y-coordinate
* @param octaves Number of octaves to use
* @param frequency How much to alter the frequency by each octave
* @param amplitude How much to alter the amplitude by each octave
* @return Resulting noise
*/
public double noise(double x, double y, int octaves, double frequency, double amplitude) {
return noise(x, y, 0, octaves, frequency, amplitude);
}
/**
* Generates noise for the 2D coordinates using the specified number of
* octaves and parameters
*
* @param x X-coordinate
* @param y Y-coordinate
* @param octaves Number of octaves to use
* @param frequency How much to alter the frequency by each octave
* @param amplitude How much to alter the amplitude by each octave
* @param normalized If true, normalize the value to [-1, 1]
* @return Resulting noise
*/
public double noise(double x, double y, int octaves, double frequency, double amplitude, boolean normalized) {
return noise(x, y, 0, octaves, frequency, amplitude, normalized);
}
/**
* Generates noise for the 3D coordinates using the specified number of
* octaves and parameters
*
* @param x X-coordinate
* @param y Y-coordinate
* @param z Z-coordinate
* @param octaves Number of octaves to use
* @param frequency How much to alter the frequency by each octave
* @param amplitude How much to alter the amplitude by each octave
* @return Resulting noise
*/
public double noise(double x, double y, double z, int octaves, double frequency, double amplitude) {
return noise(x, y, z, octaves, frequency, amplitude, false);
}
/**
* Generates noise for the 3D coordinates using the specified number of
* octaves and parameters
*
* @param x X-coordinate
* @param y Y-coordinate
* @param z Z-coordinate
* @param octaves Number of octaves to use
* @param frequency How much to alter the frequency by each octave
* @param amplitude How much to alter the amplitude by each octave
* @param normalized If true, normalize the value to [-1, 1]
* @return Resulting noise
*/
public double noise(double x, double y, double z, int octaves, double frequency, double amplitude, boolean normalized) {
double result = 0;
double amp = 1;
double freq = 1;
double max = 0;
for (int i = 0; i < octaves; i++) {
result += noise(x * freq, y * freq, z * freq) * amp;
max += amp;
freq *= frequency;
amp *= amplitude;
}
if (normalized) {
result /= max;
}
return result;
}
}
|
