TerrainGen coverage

terraingen/
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sources/synthetic_terrain.cpp
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1 #include "terraingen/sources/synthetic_terrain.h"
2
3 #include "terraingen/util/checks.h"
4 #include "terraingen/util/log.h"
5
6 #include <cmath>
7 #include <stdexcept>
8 #include <string>
9
10 namespace terraingen {
11
12 349 void ValidateSyntheticTerrain(const SyntheticTerrainParams& params) {
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 349 if (params.layers.empty() || params.layers.size() > kMaxNoiseLayers) {
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 12 throw std::invalid_argument("A synthetic terrain needs between 1 and " +
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 18 std::to_string(kMaxNoiseLayers) + " layers");
16 }
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 746 for (std::size_t i = 0; i < params.layers.size(); ++i) {
18 try {
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 405 ValidateNoiseLayer(params.layers[i]);
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 2 } catch (const std::invalid_argument& error) {
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 2 throw std::invalid_argument("Layer " + std::to_string(i + 1) + ": " + error.what());
22 2 }
23 }
24 341 }
25
26 34 void FillSyntheticTerrain(Raster<float>& raster, const SyntheticTerrainParams& params) {
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 34 ValidateSyntheticTerrain(params);
28 33 const Stopwatch stopwatch;
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 601 for (std::size_t row = 0; row < raster.Height(); ++row) {
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 19848 for (std::size_t col = 0; col < raster.Width(); ++col) {
31 19280 const Vec2d centre = raster.CellCenter(col, row);
32 19280 raster(col, row) =
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 19280 EvaluateNoiseLayers(static_cast<float>(centre.x), static_cast<float>(centre.y),
34 params.layers.data(), params.layers.size());
35 }
36 }
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 33 LogInfo("sources", "Filled ", raster.Width(), "x", raster.Height(), " synthetic terrain (",
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 33 params.layers.size(), params.layers.size() == 1 ? " layer" : " layers", ") in ",
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 66 FormatDuration(stopwatch.Milliseconds()));
40 33 }
41
42 18 Raster<float> GenerateSyntheticTerrain(std::size_t width, std::size_t height, double pixelSize,
43 const SyntheticTerrainParams& params) {
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 18 if (width == 0 || height == 0) {
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 3 throw std::invalid_argument("Raster width and height must be at least 1");
46 }
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 15 RequirePositive(pixelSize, "Pixel size");
48 13 ValidateSyntheticTerrain(params);
49
50 12 Raster<float> raster(width, height);
51 12 raster.SetTransform(GeoTransform::NorthUp(-0.5 * static_cast<double>(width) * pixelSize,
52 12 0.5 * static_cast<double>(height) * pixelSize,
53 pixelSize));
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 12 FillSyntheticTerrain(raster, params);
55 12 return raster;
56 }
57
58 } // namespace terraingen
59