More pond stuff

1 files changed, 38 insertions, 0 deletions

diff --git a/src/world.c b/src/world.c
index 87ca0d4..7b9abe4 100644
--- a/src/world.c
+++ b/src/world.c
@@ -395,11 +395,41 @@ Seed generateWorldItems(World* world, Seed seed, int start, int end)
 
 Seed generatePond(World* world, Color* heightmap, WorldUID id, Seed seed)
 {
+  // Create pond entity.
   Vector3 position = getRandomPositionFromCenter(world, &seed,
                                                  PLACE_POND_MIN_DISTANCE,
                                                  PLACE_POND_MAX_DISTANCE);
   Entity pond = createEntity(POND, position);
   world->entities[id] = pond;
+
+  // Get lowest height.
+  int height = 255;
+
+  Vector2 start = worldPositionToPixel(world, pond.box.min.x, pond.box.min.z);
+  Vector2 end = worldPositionToPixel(world, pond.box.max.x, pond.box.max.z);
+  
+  for (int y = start.y; y < end.y; ++y)
+  {
+    for (int x = start.x; x < end.x; ++x)
+    {
+      int pixelHeight = heightmap[y * WORLD_IMAGE_WIDTH + x].r;
+
+      if (pixelHeight < height)
+      {
+        height = pixelHeight;
+      }
+    }
+  }
+
+  // Set new height.
+  for (int y = start.y; y < end.y; ++y)
+  {
+    for (int x = start.x; x < end.x; ++x)
+    {
+      heightmap[y * WORLD_IMAGE_WIDTH + x] =
+        (Color){height, height, height, 255};
+    }
+  }
   
   return seed;
 }
@@ -540,6 +570,14 @@ void freeWorld(World world)
   freeWorldBVH(world.bvh);
 }
 
+Vector2 worldPositionToPixel(const World* world, float x, float y)
+{
+  return (Vector2){
+    roundf((float)WORLD_IMAGE_WIDTH / world->size.x * x),
+    roundf((float)WORLD_IMAGE_HEIGHT / world->size.z * y)
+  };
+}
+
 float getWorldHeightAtLocation(const World* world, float x, float y)
 {
   float mapX = (float)WORLD_IMAGE_WIDTH / world->size.x * x;