Fixes #14. mtseeder and mtwebmapper now have command line flags -ymin=block and -ymax=block to limit the y range of mapping. Defaults to full range.

cmd/mtseeder/baselevel.go

@@ -35,16 +35,9 @@ func createTiles(
 	}
 }
 
-func order(a, b int) (int, int) {
-	if a < b {
-		return a, b
-	}
-	return b, a
-}
-
 func createBaseLevel(
 	address string,
-	xMin, zMin, xMax, zMax int,
+	xMin, yMin, zMin, xMax, yMax, zMax int,
 	transparent bool, transparentDim float32,
 	colorsFile, outDir string,
 	numWorkers int) (err error) {
@@ -71,11 +64,14 @@ func createBaseLevel(
 			return
 		}
 		done.Add(1)
-		btc := common.NewBaseTileCreator(client, colors, transparent, baseDir, false)
+		btc := common.NewBaseTileCreator(
+			client, colors,
+			int16(yMin), int16(yMax),
+			transparent, baseDir, false)
 		go createTiles(btc, jobs, &done)
 	}
 
-	zMin, zMax = order(zMin, zMax)
+	zMin, zMax = common.Order(zMin, zMax)
 
 	for x, i := int16(xMin), 0; x <= int16(xMax); x += 16 {
 		xDir := filepath.Join(baseDir, strconv.Itoa(i))

cmd/mtseeder/main.go

@@ -16,8 +16,8 @@ func main() {
 	var (
 		port             int
 		host             string
-		xMin, zMin     int
-		xMax, zMax     int
+		xMin, yMin, zMin int
+		xMax, yMax, zMax int
 		colorsFile       string
 		outDir           string
 		numWorkers       int
@@ -33,6 +33,8 @@ func main() {
 	flag.StringVar(&host, "host", "localhost", "host to mtredisalize server")
 	flag.IntVar(&xMin, "xmin", -1933, "x min of the area to tile")
 	flag.IntVar(&xMax, "xmax", 1932, "x max of the area to tile")
+	flag.IntVar(&yMin, "ymin", common.MinHeight, "Minimum y in blocks.")
+	flag.IntVar(&yMax, "ymax", common.MaxHeight, "Maximum y in blocks.")
 	flag.IntVar(&zMin, "zmin", -1933, "z min of the area to tile")
 	flag.IntVar(&zMax, "zmax", 1932, "z max of the area to tile")
 	flag.StringVar(&colorsFile, "colors", "colors.txt", "definition of colors")
@@ -65,7 +67,7 @@ func main() {
 		address := fmt.Sprintf("%s:%d", host, port)
 		if err := createBaseLevel(
 			address,
-			xMin, zMin, xMax, zMax,
+			xMin, yMin, zMin, xMax, yMax, zMax,
 			transparent, td,
 			colorsFile,
 			outDir,

cmd/mtwebmapper/main.go

@@ -32,6 +32,8 @@ func main() {
 		websockets     bool
 		playersFIFO    string
 		version        bool
+		yMin           int
+		yMax           int
 	)
 	flag.IntVar(&webPort, "web-port", 8808, "port of the web server")
 	flag.IntVar(&webPort, "p", 8808, "port of the web server (shorthand)")
@@ -64,6 +66,8 @@ func main() {
 	flag.BoolVar(&websockets, "ws", false, "Forward tile changes to clients via websockets (shorthand).")
 	flag.StringVar(&playersFIFO, "players", "", "Path to FIFO file to read active players from.")
 	flag.StringVar(&playersFIFO, "ps", "", "Path to FIFO file to read active players from (shorthand).")
+	flag.IntVar(&yMin, "ymin", common.MinHeight, "Minimum y in blocks.")
+	flag.IntVar(&yMax, "ymax", common.MaxHeight, "Maximum y in blocks.")
 	flag.BoolVar(&version, "version", false, "Print version and exit.")
 
 	flag.Parse()
@@ -113,6 +117,7 @@ func main() {
 			redisAddress,
 			allowedUpdateIps,
 			colors,
+			yMin, yMax,
 			transparent,
 			workers,
 			btu)

cmd/mtwebmapper/tilesupdater.go

@@ -35,6 +35,7 @@ type tileUpdater struct {
 	redisAddress string
 	ips          []net.IP
 	colors       *common.Colors
+	yMin, yMax   int16
 	workers      int
 	transparent  bool
 	cond         *sync.Cond
@@ -71,6 +72,7 @@ func newTileUpdater(
 	mapDir, redisAddress string,
 	ips []net.IP,
 	colors *common.Colors,
+	yMin, yMax int,
 	transparent bool,
 	workers int,
 	btu baseTilesUpdates) *tileUpdater {
@@ -82,6 +84,8 @@ func newTileUpdater(
 		ips:          ips,
 		changes:      map[xz]bool{},
 		colors:       colors,
+		yMin:         int16(yMin),
+		yMax:         int16(yMax),
 		transparent:  transparent,
 		workers:      workers}
 	tu.cond = sync.NewCond(&tu.mu)
@@ -166,7 +170,10 @@ func (tu *tileUpdater) doUpdates() {
 				log.Printf("WARN: Cannot connect to redis server: %s\n", err)
 				continue
 			}
-			btc := common.NewBaseTileCreator(client, tu.colors, tu.transparent, baseDir, true)
+			btc := common.NewBaseTileCreator(
+				client, tu.colors,
+				tu.yMin, tu.yMax,
+				tu.transparent, baseDir, true)
 			done.Add(1)
 			go updateBaseTiles(jobs, btc, &done)
 		}

common/basetilecreator.go

@@ -18,10 +18,15 @@ const (
 	yOrderCapacity = 512
 )
 
+const (
+	MaxHeight = 1934
+	MinHeight = -1934
+)
+
 // To scan the whole height in terms of the y coordinate
 // the database is queried in height units defined in the tileDepths table.
 var tileDepths = [...][2]int16{
-	{1024, 1934},
+	{1024, MaxHeight},
 	{256, 1023},
 	{128, 255},
 	{64, 127},
@@ -40,7 +45,7 @@ var tileDepths = [...][2]int16{
 	{-128, -65},
 	{-256, -129},
 	{-1024, -257},
-	{-1934, -1025}}
+	{MinHeight, -1025}}
 
 var BackgroundColor = color.RGBA{R: 0xff, G: 0xff, B: 0xff, A: 0xff}
 
@@ -49,6 +54,8 @@ type BaseTileCreator struct {
 	colors     *Colors
 	renderer   *Renderer
 	yOrder     *YOrder
+	yMin       int16
+	yMax       int16
 	baseDir    string
 	update     bool
 	emptyImage []byte
@@ -57,15 +64,19 @@ type BaseTileCreator struct {
 func NewBaseTileCreator(
 	client *RedisClient,
 	colors *Colors,
+	yMin, yMax int16,
 	transparent bool,
 	baseDir string,
 	update bool) *BaseTileCreator {
 	renderer := NewRenderer(tileWidth, tileHeight, transparent)
+	yMin, yMax = Order16(yMin, yMax)
 	return &BaseTileCreator{
 		client:   client,
 		colors:   colors,
 		renderer: renderer,
 		yOrder:   NewYOrder(renderer, yOrderCapacity),
+		yMin:     yMin,
+		yMax:     yMax,
 		baseDir:  baseDir,
 		update:   update}
 }
@@ -95,8 +106,11 @@ func (btc *BaseTileCreator) CreateTile(x, z int16, i, j int) error {
 		X2: int16(tileWidth) - 1, Z2: int16(tileHeight) - 1}
 
 	for _, yRange := range tileDepths {
-		c1.Y = yRange[0]
-		c2.Y = yRange[1]
+		if yRange[0] > btc.yMax || yRange[1] < btc.yMin {
+			continue
+		}
+		c1.Y = max16(yRange[0], btc.yMin)
+		c2.Y = min16(yRange[1], btc.yMax)
 
 		nareas = btc.renderer.UncoveredAreas(nareas, oareas)
 

common/math.go

@@ -63,6 +63,20 @@ func Clamp32f(x, a, b float32) float32 {
 	return x
 }
 
+func Order(a, b int) (int, int) {
+	if a < b {
+		return a, b
+	}
+	return b, a
+}
+
+func Order16(a, b int16) (int16, int16) {
+	if a < b {
+		return a, b
+	}
+	return b, a
+}
+
 func Order64(a, b int64) (int64, int64) {
 	if a < b {
 		return a, b