dev4/psychlops/core/math/util.cs

   1 using System;\r
   2 \r
   3 namespace Psychlops\r
   4 {\r
   5 \r
   6         public static class Math\r
   7         {\r
   8                 public static readonly double PI = 3.14159265, E = 2.718281828459045, LOG2E = 1.44269504088896340736;\r
   9                 public static Random random_generator;\r
  10                 static Math()\r
  11                 {\r
  12                         random_generator = new Random();\r
  13                 }\r
  14 \r
  15                 public static double max(double val1, double val2)\r
  16                 {\r
  17                         return val1 > val2 ? val1 : val2;\r
  18                 }\r
  19                 public static double min(double val1, double val2)\r
  20                 {\r
  21                         return val1 < val2 ? val1 : val2;\r
  22                 }\r
  23                 public static void shuffle<X>(X[] array, int n)\r
  24                 {\r
  25                         int a;\r
  26                         X tmp;\r
  27                         for(int i = 1; i < n; i++){\r
  28                                 a = random(i + 1);\r
  29                                 tmp = array[i];\r
  30                                 array[i] = array[a];\r
  31                                 array[a] = tmp;\r
  32                         }\r
  33                 }\r
  34 \r
  35 \r
  36                 public static double mod(double lhs, double rhs)\r
  37                 {\r
  38                         return lhs - System.Math.Floor(lhs/rhs)*rhs;\r
  39                 }\r
  40                 public static double abs(double x)\r
  41                 {\r
  42                         return System.Math.Abs(x);\r
  43                 }\r
  44                 public static double sin(double x)\r
  45                 {\r
  46                         return System.Math.Sin(x);\r
  47                 }\r
  48                 public static double cos(double x)\r
  49                 {\r
  50                         return System.Math.Cos(x);\r
  51                 }\r
  52                 public static double tan(double x)\r
  53                 {\r
  54                         return System.Math.Tan(x);\r
  55                 }\r
  56                 public static double sqrt(double x)\r
  57                 {\r
  58                         return System.Math.Sqrt(x);\r
  59                 }\r
  60                 public static double exp(double x)\r
  61                 {\r
  62                         return System.Math.Exp(x);\r
  63                 }\r
  64                 public static double log(double x)\r
  65                 {\r
  66                         return System.Math.Log(x);\r
  67                 }\r
  68                 public static double log2(double val)\r
  69                 {\r
  70                         return log(val) * LOG2E;\r
  71                 }\r
  72                 /*public static int round(double val)\r
  73                 {\r
  74                         double integer_part, particle = modf(val, &integer_part);\r
  75                         return ((particle < 0.5 | (particle == 0.5 && (int)integer_part % 2 == 0)) ? (int)integer_part : (int)integer_part + 1);\r
  76                 }*/\r
  77 \r
  78                 public static double radius(double x, double y)\r
  79                 {\r
  80                         return System.Math.Sqrt(x * x + y * y);\r
  81                 }\r
  82 \r
  83                 public static double random()\r
  84                 {\r
  85                         return (random_generator.NextDouble());\r
  86                 }\r
  87                 public static int random(int x)\r
  88                 {\r
  89                         return (int)((random_generator.NextDouble()) * x);\r
  90                 }\r
  91                 public static double random(double x)\r
  92                 {\r
  93                         return (random_generator.NextDouble()) * x;\r
  94                 }\r
  95                 public static double random(double x, double y)\r
  96                 {\r
  97                         return (random_generator.NextDouble()) * (y-x) + x;\r
  98                 }\r
  99 \r
 100 \r
 101                 public static double gaussian(double x, double sigma)\r
 102                 {\r
 103                         return exp(- (x*x) / (2*sigma*sigma));\r
 104                 }\r
 105         }\r
 106 \r
 107 }