Added sources.

ds.c

@@ -0,0 +1,209 @@
+#ifndef __cplusplus
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+#include <float.h>
+#include <math.h>
+#include <string.h>
+
+#else
+
+#include <cstdio>
+#include <cstdlib>
+#include <ctime>
+#include <cfloat>
+#include <cmath>
+#include <cstring>
+
+#endif
+
+#include "ds.h"
+
+static const float SEED = 1000.0;
+
+static float randomFloat ();
+
+/**
+ * Port of the java implementation outlined here http://stackoverflow.com/a/2773032
+ */
+void ds ( float *** map, const unsigned int DATA_SIZE ) {
+  float    avg, r, h = SEED / 2.0;
+  int       sideLength, halfSide, x, y;
+
+  srand( time( NULL ) );
+
+  ( * map )[ 0 ][ 0 ] = ( * map )[ 0 ][ DATA_SIZE - 1 ] = ( * map )[ DATA_SIZE - 1 ][ 0 ] = ( * map )[ DATA_SIZE - 1 ][ DATA_SIZE - 1 ] = h;
+
+  for ( sideLength = DATA_SIZE - 1; sideLength >= 2; sideLength /= 2, h /= 2.0 ) {
+    halfSide = sideLength / 2;
+
+    for ( x = 0; x < DATA_SIZE -1; x += sideLength ) {
+      for ( y = 0; y < DATA_SIZE - 1; y += sideLength ) {
+	avg = ( * map )[ x ][ y ] +
+	  ( * map )[ x + sideLength ][ y ] +
+	  ( * map )[ x ][ y + sideLength ] +
+	  ( * map )[ x + sideLength ][ y + sideLength ];
+	avg /= 4.0;
+
+	r = randomFloat();
+
+	( * map )[ x + halfSide ][ y + halfSide ] = avg + ( r * 2.0 * h ) - h;
+      }
+    }
+
+    for ( x = 0; x < DATA_SIZE - 1; x += halfSide ) {
+      for ( y =  ( x + halfSide ) % sideLength; y < DATA_SIZE - 1; y += sideLength ) {
+	avg = ( * map )[ ( x - halfSide + DATA_SIZE ) % DATA_SIZE ][ y ] +
+	  ( * map )[ ( x + halfSide ) % DATA_SIZE ][ y ] +
+	  ( * map )[ x ][ ( y + halfSide ) % DATA_SIZE ] +
+	  ( * map )[ x ][ ( y - halfSide + DATA_SIZE ) % DATA_SIZE ];
+	avg /= 4.0;
+
+	r = randomFloat();
+
+	avg = avg + ( r * 2.0 * h ) - h;
+
+	( * map )[ x ][ y ] = avg;
+
+	if ( x == 0 ) ( * map )[ DATA_SIZE - 1 ][ y ] = avg;
+	if ( y == 0 ) ( * map )[ x ][ DATA_SIZE - 1 ] = avg;
+      }
+    }
+  }
+}
+
+void island ( int ***imap, unsigned int MAP_SIZE ) {
+  const int part = ( MAP_SIZE * 3000 ) / 513;
+  const int life = ( MAP_SIZE * 5000 ) / 513;
+  int x, y, dx, dy, i, c, n, nx, ny, l;
+
+  srand( time( NULL ) );
+
+  for ( i = 0; i < part; ++i ) {
+    x = ( MAP_SIZE / 4 ) + ( random() % ( MAP_SIZE / 2 ) );
+    y = ( MAP_SIZE / 4 ) + ( random() % ( MAP_SIZE / 2 ) );
+
+    for ( l = life; l >= 0; l-- ) {
+      dx = ( random() % 3 ) - 1;
+      dy = ( random() % 3 ) - 1;
+
+      ( * imap )[ x ][ y ] += 1;
+
+      c = ( * imap )[ x ][ y ];
+
+      nx = ( x + dx );
+      ny = ( y + dy );
+    
+      if ( nx < 0 || nx >= MAP_SIZE || ny < 0 || ny >= MAP_SIZE ) {
+	l--;
+	continue;
+      }
+
+      if ( ( * imap )[ nx ][ ny ] <= c ) {
+	  ( * imap )[ nx ][ ny ] += 1;
+      }
+
+      x = nx;
+      y = ny;
+    }
+  }
+}
+
+void norm ( float *** fmap, unsigned int MAP_SIZE ) {
+  int i, j;
+  float max = -FLT_MAX;
+
+  for ( i = 0; i < MAP_SIZE; ++i ) {
+    for ( j = 0; j < MAP_SIZE; ++j ) {
+      max = abs( ( * fmap )[ i ][ j ] ) > max ? abs ( ( * fmap )[ i ][ j ] ) : max;
+    }
+  }
+
+  for ( i = 0; i < MAP_SIZE; ++i ) {
+    for ( j = 0; j < MAP_SIZE; ++j ) {
+      ( * fmap )[ i ][ j ] += max;
+    }
+  }
+
+  for ( i = 0; i < MAP_SIZE; ++i ) {
+    for ( j = 0; j < MAP_SIZE; ++j ) {
+      max = abs( ( * fmap )[ i ][ j ] ) > max ? abs ( ( * fmap )[ i ][ j ] ) : max;
+    }
+    }
+
+  for ( i = 0; i < MAP_SIZE; ++i ) {
+    for ( j = 0; j < MAP_SIZE; ++j ) {
+      ( * fmap )[ i ][ j ] /= max;
+    }
+  }
+}
+
+void normInt ( int *** map, unsigned int MAP_SIZE ) {
+  int i, j, max = -1;
+
+  for ( i = 0; i < MAP_SIZE; ++i ) {
+    for ( j = 0; j < MAP_SIZE; ++j ) {
+      max = max < ( * map )[ i ][ j ] ? ( * map )[ i ][ j ] : max;
+    }
+  }
+
+  for ( i = 0; i < MAP_SIZE; ++i ) {
+    for ( j = 0; j < MAP_SIZE; ++j ) {
+      ( * map )[ i ][ j ] = ( int ) ( ( ( float ) ( * map )[ i ][ j ] / ( float ) max ) * 255.0 );
+    }
+  }
+}
+
+extern void mult ( float *** fmap, int *** imap, unsigned int MAP_SIZE ) {
+  int i, j;
+  
+  for ( i = 0; i < MAP_SIZE; ++i ) {
+    for ( j = 0; j < MAP_SIZE; ++j ) {
+      /*fprintf ( stderr, "%f %d\n", ( * fmap )[ i ][ j ], ( * imap )[ i ][ j ] );*/
+      ( * imap )[ i ][ j ] = ( int )( ( ( * fmap )[ i ][ j ] * ( ( float ) ( * imap )[ i ][ j ] / 255.0f ) ) * 250.0f );
+    }
+  }
+
+}
+
+void smooth ( int *** map, unsigned int MAP_SIZE) {
+  int i, j, avg, **temp;
+  
+  temp = ( int ** ) malloc ( sizeof ( int * ) * MAP_SIZE );
+  for ( i = 0; i < MAP_SIZE; ++i ){
+    temp[ i ] = ( int * ) malloc ( sizeof ( int ) * MAP_SIZE );
+  }
+
+  for ( i = 0; i < MAP_SIZE; ++i ) {
+    for ( j = 0; j < MAP_SIZE; ++j ) {
+      avg = 0;
+
+      avg += ( * map )[ i ][ j ];
+      avg += ( * map )[ ( i + 1 ) % MAP_SIZE ][ j ];
+      avg += ( * map )[ ( i - 1 ) < 0 ? MAP_SIZE - 1 : i - 1 ][ j ];
+      avg += ( * map )[ i ][ ( j + 1 ) % MAP_SIZE ];
+      avg += ( * map )[ i ][ ( j  - 1 ) < 0 ? MAP_SIZE - 1 : j - 1 ];
+      avg += ( * map )[ ( i + 1 ) % MAP_SIZE ][ ( j + 1 ) % MAP_SIZE ];
+      avg += ( * map )[ ( i + 1 ) % MAP_SIZE ][ ( j  - 1 ) < 0 ? MAP_SIZE - 1 : j - 1 ];
+      avg += ( * map )[ ( i - 1 ) < 0 ? MAP_SIZE - 1 : i - 1 ][ ( j + 1 ) % MAP_SIZE ];
+      avg += ( * map )[ ( i - 1 ) < 0 ? MAP_SIZE - 1 : i - 1 ][ ( j  - 1 ) < 0 ? MAP_SIZE - 1 : j - 1 ];
+
+      avg /= 9;
+
+      temp[ i ][ j ] = avg;
+    }
+  }
+
+  for ( i = 0; i < MAP_SIZE; ++i ){
+    memcpy ( ( * map )[ i ], temp[ i ], MAP_SIZE * sizeof ( int ) );
+  }
+
+  free ( temp );
+}
+
+static float randomFloat() {
+  float r =  ( float ) random() / ( float ) RAND_MAX;
+  r = ( r * 2.0 ) - 1.0;
+  return r;
+}