103 lines
2.9 KiB
C#
103 lines
2.9 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Text;
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namespace OpenSim.Terrain.BasicTerrain
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{
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static class Normalise
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{
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/// <summary>
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/// Converts the heightmap to values ranging from 0..1
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/// </summary>
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/// <param name="map">The heightmap to be normalised</param>
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public static void normalise(float[,] map)
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{
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double max = findMax(map);
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double min = findMin(map);
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int w = map.GetLength(0);
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int h = map.GetLength(1);
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int x, y;
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for (x = 0; x < w; x++)
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{
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for (y = 0; y < h; y++)
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{
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map[x, y] = (float)((map[x, y] - min) * (1.0 / (max - min)));
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}
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}
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}
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/// <summary>
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/// Converts the heightmap to values ranging from 0..<newmax>
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/// </summary>
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/// <param name="map">The heightmap to be normalised</param>
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/// <param name="newmax">The new maximum height value of the map</param>
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public static void normalise(float[,] map, double newmax)
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{
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double max = findMax(map);
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double min = findMin(map);
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int w = map.GetLength(0);
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int h = map.GetLength(1);
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int x, y;
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for (x = 0; x < w; x++)
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{
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for (y = 0; y < h; y++)
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{
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map[x, y] = (float)((map[x, y] - min) * (1.0 / (max - min)) * newmax);
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}
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}
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}
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/// <summary>
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/// Finds the largest value in the heightmap
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/// </summary>
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/// <param name="map">The heightmap</param>
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/// <returns>The highest value</returns>
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public static double findMax(float[,] map)
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{
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int x, y;
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int w = map.GetLength(0);
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int h = map.GetLength(1);
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double max = double.MinValue;
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for (x = 0; x < w; x++)
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{
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for (y = 0; y < h; y++)
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{
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if (map[x, y] > max)
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max = map[x, y];
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}
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}
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return max;
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}
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/// <summary>
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/// Finds the lowest value in a heightmap
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/// </summary>
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/// <param name="map">The heightmap</param>
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/// <returns>The minimum value</returns>
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public static double findMin(float[,] map)
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{
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int x, y;
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int w = map.GetLength(0);
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int h = map.GetLength(1);
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double min = double.MaxValue;
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for (x = 0; x < w; x++)
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{
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for (y = 0; y < h; y++)
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{
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if (map[x, y] < min)
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min = map[x, y];
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}
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}
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return min;
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}
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}
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}
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