Update teleport docs and allow overriding Y coord when teleporting

README.md

@@ -143,10 +143,12 @@ There is a dummy user named "Server" in every player's friends list that you can
 
 ### Bonus
 
-When you want to teleport to somewhere, use the ingame marking function on Map, click Confirm. You will see your
-character falling from a very high destination, exact location that you marked.
-
-You can also specify a set Y coordinate by renaming the map marker.
+- Teleporting
+  - When you want to teleport to somewhere, use the in-game marking function on Map.
+    - Mark a point on the map using the fish hook marking (the last one.)
+    - (Optional) rename the map marker to a number to override the default Y coordinate (height, default 300.)
+    - Confirm and close the map.
+    - You will see your character falling from a very high destination, exact location that you marked.
  
 # Quick Troubleshooting
 

README_zh-CN.md

@@ -145,6 +145,12 @@ chmod +x gradlew
 ### 额外功能
 
 当你想传送到某个地点, 只需要在地图中创建标记, 关闭地图后即可到达目标地点上空
+- 传送
+   - 当你想传送到某个地点时，可以使用游戏里的地图标记功能。
+      - 用鱼钩（最后一个图标）在地图上标记一个点位。
+      - （可选） 将标记名称改为数字，即可修改传送位置的Y坐标（高度，缺省值是300）。
+      - 确认添加标记，并关闭地图。
+      - 你会看到你的角色从你选定点位的正上方高空落下。
 
 # 快速排除问题
 

src/main/java/emu/grasscutter/server/packet/recv/HandlerMarkMapReq.java

@@ -70,9 +70,7 @@ public class HandlerMarkMapReq extends PacketHandler {
 	}
 
 	private void teleport(Player player, MapMark mapMark) {
-		// Increased height means you can fly to the top of dragonspine now,
-		// at the cost of slightly longer falling to your destination.
-		float y = 700;
+		float y = isInt(mapMark.getName()) ? Integer.parseInt(mapMark.getName()) : 300;
 		float x = mapMark.getPosition().getX();
 		float z = mapMark.getPosition().getZ();
 		player.getPos().set(x, y, z);