TerrainGen coverage

terraingen/
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random/value_distribution.cpp
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1 #include "terraingen/random/value_distribution.h"
2
3 #include <algorithm>
4 #include <cmath>
5 #include <numbers>
6 #include <stdexcept>
7
8 namespace terraingen {
9
10 1035847 double StandardNormal(double u1, double u2) {
11 1035847 return std::sqrt(-2.0 * std::log1p(-u1)) * std::cos(2.0 * std::numbers::pi * u2);
12 }
13
14 61778477 double ValueDistribution::Sample(double u1, double u2) const {
15 61778477 double value = a;
16
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 61778477 switch (kind) {
17 60589429 case Kind::Constant:
18 60589429 break;
19 545708 case Kind::Uniform:
20 545708 value = a + (b - a) * u1;
21 545708 break;
22 64107 case Kind::Normal:
23 64107 value = a + b * StandardNormal(u1, u2);
24 64107 break;
25 579233 case Kind::LogNormal:
26 579233 value = a * std::exp(b * StandardNormal(u1, u2));
27 579233 break;
28 }
29
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 123556954 return std::clamp(value, min, max);
30 }
31
32 992208 double ValueDistribution::Lowest() const {
33
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 992208 switch (kind) {
34 990016 case Kind::Constant:
35 case Kind::Uniform:
36 990016 return std::clamp(a, min, max);
37 1276 case Kind::Normal:
38 1276 return min;
39 916 case Kind::LogNormal:
40 916 return std::fmax(0.0, min);
41 }
42 ✗ return min;
43 }
44
45 763115 double ValueDistribution::Highest() const {
46
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 763115 switch (kind) {
47 15277 case Kind::Constant:
48 15277 return std::clamp(a, min, max);
49 745256 case Kind::Uniform:
50 745256 return std::clamp(b, min, max);
51 2582 case Kind::Normal:
52 case Kind::LogNormal:
53 2582 return max;
54 }
55 ✗ return max;
56 }
57
58 1239418 void ValidateValueDistribution(const ValueDistribution& d) {
59
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 2478835 if (!(std::isfinite(d.a) && std::isfinite(d.b)) || std::isnan(d.min) || std::isnan(d.max) ||
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 1239417 d.min > d.max) {
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 2 throw std::invalid_argument("Distribution parameters must be finite with min <= max");
62 }
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 1239416 if (d.kind == ValueDistribution::Kind::Uniform && d.b < d.a) {
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 3 throw std::invalid_argument("A uniform distribution needs b >= a");
65 }
66 3716952 if ((d.kind == ValueDistribution::Kind::Normal ||
67
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 1241625 d.kind == ValueDistribution::Kind::LogNormal) &&
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 2212 (d.b < 0.0 || !std::isfinite(d.max))) {
69 throw std::invalid_argument(
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 11 "Normal and log-normal distributions need a non-negative spread and a finite max");
71 }
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 1239402 if (d.kind == ValueDistribution::Kind::LogNormal && !(d.a > 0.0)) {
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 1 throw std::invalid_argument("A log-normal distribution needs a positive median");
74 }
75 1239401 }
76
77 } // namespace terraingen
78