Turned into a lib.

.gitignore

@@ -16,7 +16,7 @@
 *.exe
 *.out
 *.app
-ds
+island
 
 # Emacs backups
 *~

Makefile

@@ -1,16 +1,24 @@
-LDLIBS = -lm
+CC := gcc
+CFLAGS := -I./ -ansi -pedantic
+LDFLAGS := -L./
+LDLIBS := -lm -lisland
 
-all: CFLAGS = -O3 -ansi -pedantic
+all: CFLAGS += -O3
-all: ds
+all: lib island
 
-debug: CFLAGS = -g -ansi -pedantic
+debug: CFLAGS += -g
-debug: ds
+debug: lib island
 
-ds: main.o ds.o
+lib: libisland.a
 
-main.o: main.c ds.h
+libisland.a: island.o
+	ar rcs libisland.a island.o
 
-ds.o: ds.c ds.h
+island: main.o
+
+main.o: main.c island.h
+
+island.o: island.c island.h
 
 clean:
-	$(RM) *.o ds
+	$(RM) *.o *.a island

island.c

@@ -18,7 +18,7 @@
 
 #endif
 
-#include "ds.h"
+#include "island.h"
 
 static const float SEED = 1000.0;
 
@@ -160,7 +160,6 @@ extern void mult ( float *** fmap, int *** imap, unsigned int MAP_SIZE ) {
   
   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 );
     }
   }
@@ -212,3 +211,25 @@ static float randomFloat() {
   r = ( r * 2.0 ) - 1.0;
   return r;
 }
+
+terrain_t terrainType( int h ) {
+  if ( h < 30 ) {
+    if ( h < 15 ) {
+      return DEEP_WATER;
+    } else {
+      return SHALLOW_WATER;
+    }
+  } else {
+    if ( h < 40 ) {
+      return SAND;
+    } else if ( h >= 40 && h < 100 ) {
+      return GRASS;
+    } else if ( h >= 100 && h < 150 ) {
+      return FOREST;
+    } else if ( h >= 180 ) {
+      return MOUNTAIN;
+    } else {
+      return HILL;
+    }
+  }
+}

island.h

@@ -1,10 +1,19 @@
-#ifndef DS_H
+#ifndef ISLAND_H
-#define DS_H
+#define ISLAND_H
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
+typedef enum TERRAIN_TYPE { DEEP_WATER,
+                            SHALLOW_WATER,
+                            SAND,
+                            GRASS,
+                            FOREST,
+                            HILL,
+                            MOUNTAIN
+                          } terrain_t;
+
   /**
    * Generate a diamond-square fractal map.
    */
@@ -36,6 +45,12 @@ extern "C" {
    */
   extern void mult ( float ***, int ***, unsigned int );
 
+  /**
+   * Given a sample from a heightmap, return the terrain
+   * type that correspond it.
+   */
+  terrain_t terrainType( int );
+
 #ifdef __cplusplus
 }
 #endif

main.c

@@ -8,7 +8,7 @@
 #include <float.h>
 #include <string.h>
 
-#include "ds.h"
+#include "island.h"
 
 struct COLOR {
   unsigned char r;