3 files changed, 21 insertions, 20 deletions
diff --git a/mcmap/chunk.go b/mcmap/chunk.go
index 3241d82..9cf2dc7 100644
--- a/mcmap/chunk.go
+++ b/mcmap/chunk.go
@@ -86,6 +86,17 @@ func (c *Chunk) Height(x, z int) int {
 	return int(c.heightMap[z*ChunkSizeXZ+x])
 }
 
+// Iter iterates ofer all blocks of this chunk and calls the function fx with the coords (x,y,z) and a pointer to the block.
+func (c *Chunk) Iter(fx func(int, int, int, *Block)) {
+	for x := 0; x < ChunkSizeXZ; x++ {
+		for y := 0; y < ChunkSizeY; y++ {
+			for z := 0; z < ChunkSizeXZ; z++ {
+				fx(x, y, z, &(c.blocks[calcBlockOffset(x, y, z)]))
+			}
+		}
+	}
+}
+
 // Biome gets the Biome at x,z.
 func (c *Chunk) Biome(x, z int) Biome { return c.biomes[x*ChunkSizeXZ+z] }
 
diff --git a/mcmap/examples/emeraldfinder/main.go b/mcmap/examples/emeraldfinder/main.go
index 3249a35..ea22624 100644
--- a/mcmap/examples/emeraldfinder/main.go
+++ b/mcmap/examples/emeraldfinder/main.go
@@ -36,17 +36,12 @@ chunkLoop:
 			os.Exit(1)
 		}
 
-		for y := 0; y < mcmap.ChunkSizeY; y++ {
-			for x := 0; x < mcmap.ChunkSizeXZ; x++ {
-				for z := 0; z < mcmap.ChunkSizeXZ; z++ {
-					blk := chunk.Block(x, y, z)
-					if blk.ID == mcmap.BlkEmeraldOre {
-						absx, absz := mcmap.ChunkToBlock(cx, cz, x, z)
-						fmt.Printf("%d, %d, %d\n", absx, y, absz)
-					}
-				}
+		chunk.Iter(func(x, y, z int, blk *mcmap.Block) {
+			if blk.ID == mcmap.BlkEmeraldOre {
+				absx, absz := mcmap.ChunkToBlock(cx, cz, x, z)
+				fmt.Printf("%d, %d, %d\n", absx, y, absz)
 			}
-		}
+		})
 
 		chunk.MarkUnused()
 	}
diff --git a/mcmap/examples/replace/main.go b/mcmap/examples/replace/main.go
index 87dd677..d289522 100644
--- a/mcmap/examples/replace/main.go
+++ b/mcmap/examples/replace/main.go
@@ -37,17 +37,12 @@ chunkLoop:
 		}
 
 		modified := false
-		for y := 0; y < mcmap.ChunkSizeY; y++ {
-			for x := 0; x < mcmap.ChunkSizeXZ; x++ {
-				for z := 0; z < mcmap.ChunkSizeXZ; z++ {
-					blk := chunk.Block(x, y, z)
-					if blk.ID == mcmap.BlkBlockOfIron {
-						blk.ID = mcmap.BlkBlockOfDiamond
-						modified = true
-					}
-				}
+		chunk.Iter(func(x, y, z int, blk *mcmap.Block) {
+			if blk.ID == mcmap.BlkBlockOfIron {
+				blk.ID = mcmap.BlkBlockOfDiamond
+				modified = true
 			}
-		}
+		})
 
 		if modified {
 			fmt.Printf("Modified chunk %d, %d.\n", cx, cz)