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/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)
 		}