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authorworktycho <work.tycho@gmail.com>2013-12-09 18:51:12 +0100
committerworktycho <work.tycho@gmail.com>2013-12-09 18:51:12 +0100
commit843605d59ebc128be0a578dc6f45ef8c05da6e79 (patch)
tree3ffebc6ba27baf7a9e1d4bc51501ffeea9b14226 /src/VoronoiMap.cpp
parentmerged makefile changes (diff)
parentFix Undefined behavior at Bindings/LuaWindow line 32 (diff)
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Diffstat (limited to 'src/VoronoiMap.cpp')
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diff --git a/src/VoronoiMap.cpp b/src/VoronoiMap.cpp
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+++ b/src/VoronoiMap.cpp
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+
+// VoronoiMap.cpp
+
+// Implements the cVoronoiMap class that implements a Voronoi algorithm over a noise to produce a map
+
+#include "Globals.h"
+#include "VoronoiMap.h"
+
+
+
+
+
+cVoronoiMap::cVoronoiMap(int a_Seed, int a_CellSize) :
+ m_Noise(a_Seed),
+ m_CellSize(a_CellSize)
+{
+}
+
+
+
+
+
+void cVoronoiMap::SetCellSize(int a_CellSize)
+{
+ m_CellSize = a_CellSize;
+}
+
+
+
+
+
+int cVoronoiMap::GetValueAt(int a_X, int a_Y)
+{
+ int MinDist1, MinDist2;
+ return GetValueAt(a_X, a_Y, MinDist1, MinDist2);
+}
+
+
+
+
+
+int cVoronoiMap::GetValueAt(int a_X, int a_Y, int & a_MinDist)
+{
+ int MinDist2;
+ return GetValueAt(a_X, a_Y, a_MinDist, MinDist2);
+}
+
+
+
+
+
+int cVoronoiMap::GetValueAt(int a_X, int a_Y, int & a_MinDist1, int & a_MinDist2)
+{
+ // Note that due to historical reasons, the algorithm uses XZ coords, while the input uses XY coords.
+ // This is because the algorithm was first implemented directly in the biome generators which use MC coords.
+
+ int CellX = a_X / m_CellSize;
+ int CellZ = a_Y / m_CellSize;
+
+ // Get 5x5 neighboring cell seeds, compare distance to each. Return the value in the minumim-distance cell
+ int MinDist = m_CellSize * m_CellSize * 16; // There has to be a cell closer than this
+ int MinDist2 = MinDist;
+ int res = 0; // Will be overriden
+ for (int x = CellX - 2; x <= CellX + 2; x++)
+ {
+ int BaseX = x * m_CellSize;
+ for (int z = CellZ - 2; z < CellZ + 2; z++)
+ {
+ int OffsetX = (m_Noise.IntNoise3DInt(x, 16 * x + 32 * z, z) / 8) % m_CellSize;
+ int OffsetZ = (m_Noise.IntNoise3DInt(x, 32 * x - 16 * z, z) / 8) % m_CellSize;
+ int SeedX = BaseX + OffsetX;
+ int SeedZ = z * m_CellSize + OffsetZ;
+
+ int Dist = (SeedX - a_X) * (SeedX - a_X) + (SeedZ - a_Y) * (SeedZ - a_Y);
+ if (Dist < MinDist)
+ {
+ MinDist2 = MinDist;
+ MinDist = Dist;
+ res = m_Noise.IntNoise3DInt(x, x - z + 1000, z);
+ }
+ else if (Dist < MinDist2)
+ {
+ MinDist2 = Dist;
+ }
+ } // for z
+ } // for x
+
+ a_MinDist1 = MinDist;
+ a_MinDist2 = MinDist2;
+ return res;
+}
+
+
+
+