Add command to disable Gravity (#1955)

Allow disabling gravity (flying) for servers that allow this.
/move gravity: show gravity handling status
/move gravity on: enable gravity handling (falling)
/move gravity off: disable gravity handling (flying)

Co-authored-by: ORelio <ORelio@users.noreply.github.com>

MinecraftClient/Commands/Move.cs

@@ -8,7 +8,7 @@ namespace MinecraftClient.Commands
     public class Move : Command
     {
         public override string CmdName { get { return "move"; } }
-        public override string CmdUsage { get { return "move <on|off|get|up|down|east|west|north|south|x y z> [-f]"; } }
+        public override string CmdUsage { get { return "move <on|off|get|up|down|east|west|north|south|x y z|gravity [on|off]> [-f]"; } }
         public override string CmdDesc { get { return "walk or start walking. \"-f\": force unsafe movements like falling or touching fire"; } }
 
         public override string Run(McClient handler, string command, Dictionary<string, object> localVars)
@@ -35,6 +35,14 @@ namespace MinecraftClient.Commands
                 handler.SetTerrainEnabled(false);
                 return Translations.Get("cmd.move.disable");
             }
+            else if (args[0] == "gravity")
+            {
+                if (args.Count >= 2)
+                    Settings.GravityEnabled = (args[1] == "on");
+                if (Settings.GravityEnabled)
+                    return Translations.Get("cmd.move.gravity.enabled");
+                else return Translations.Get("cmd.move.gravity.disabled");
+            }
             else if (handler.GetTerrainEnabled())
             {
                 if (args.Count == 1)

MinecraftClient/Mapping/Movement.cs

@@ -21,21 +21,24 @@ namespace MinecraftClient.Mapping
         /// <returns>Updated location after applying gravity</returns>
         public static Location HandleGravity(World world, Location location, ref double motionY)
         {
-            Location onFoots = new Location(location.X, Math.Floor(location.Y), location.Z);
+            if (Settings.GravityEnabled)
-            Location belowFoots = Move(location, Direction.Down);
-            if (location.Y > Math.Truncate(location.Y) + 0.0001)
             {
-                belowFoots = location;
+                Location onFoots = new Location(location.X, Math.Floor(location.Y), location.Z);
-                belowFoots.Y = Math.Truncate(location.Y);
+                Location belowFoots = Move(location, Direction.Down);
+                if (location.Y > Math.Truncate(location.Y) + 0.0001)
+                {
+                    belowFoots = location;
+                    belowFoots.Y = Math.Truncate(location.Y);
+                }
+                if (!IsOnGround(world, location) && !IsSwimming(world, location))
+                {
+                    while (!IsOnGround(world, belowFoots) && belowFoots.Y >= 1)
+                        belowFoots = Move(belowFoots, Direction.Down);
+                    location = Move2Steps(location, belowFoots, ref motionY, true).Dequeue();
+                }
+                else if (!(world.GetBlock(onFoots).Type.IsSolid()))
+                    location = Move2Steps(location, onFoots, ref motionY, true).Dequeue();
             }
-            if (!IsOnGround(world, location) && !IsSwimming(world, location))
-            {
-                while (!IsOnGround(world, belowFoots) && belowFoots.Y >= 1)
-                    belowFoots = Move(belowFoots, Direction.Down);
-                location = Move2Steps(location, belowFoots, ref motionY, true).Dequeue();
-            }
-            else if (!(world.GetBlock(onFoots).Type.IsSolid()))
-                location = Move2Steps(location, onFoots, ref motionY, true).Dequeue();
             return location;
         }
 

MinecraftClient/Resources/lang/de.ini

@@ -311,6 +311,9 @@ cmd.move.dir_fail=Kann nicht in diese Richtung laufen.
 cmd.move.walk=Gehe nach {0}
 cmd.move.fail=Konnte Pfad nach {0} nicht berechnen.
 cmd.move.suggestforce=Weg nach {0} konnte nicht berechnet werden. Benutze den -f Parameter, um unsichere Wege zu aktivieren.
+cmd.move.gravity.enabled=Gravitation ist aktiv.
+cmd.move.gravity.disabled=Gravitation ist deaktiviert.
+
 
 # Reco
 cmd.reco.desc=Starte neu und verbinde erneut zum Server.

MinecraftClient/Resources/lang/en.ini

@@ -311,6 +311,8 @@ cmd.move.dir_fail=Cannot move in that direction.
 cmd.move.walk=Walking to {0}
 cmd.move.fail=Failed to compute path to {0}
 cmd.move.suggestforce=Failed to compute a safe path to {0}. Try -f parameter to allow unsafe movements.
+cmd.move.gravity.enabled=Gravity is enabled.
+cmd.move.gravity.disabled=Gravity is disabled.
 
 # Reco
 cmd.reco.desc=restart and reconnect to the server.

MinecraftClient/Resources/lang/fr.ini

@@ -311,6 +311,8 @@ cmd.move.dir_fail=Impossible de se déplacer dans cette direction.
 cmd.move.walk=Marche vers {0}
 cmd.move.fail=Échec de calcul du chemin vers {0}
 cmd.move.suggestforce=Échec de calcul du chemin vers {0}. Utilisez -f pour autoriser les mouvements risqués.
+cmd.move.gravity.enabled=La gravité est activée.
+cmd.move.gravity.disabled=La gravité est désactivée.
 
 # Reco
 cmd.reco.desc=Relancer le programme et se reconnecter au serveur

MinecraftClient/Settings.cs

@@ -93,6 +93,7 @@ namespace MinecraftClient
         public static bool DisplayChatLinks = true;
         public static bool DisplayInventoryLayout = true;
         public static bool TerrainAndMovements = false;
+        public static bool GravityEnabled = true;
         public static bool InventoryHandling = false;
         public static string PrivateMsgsCmdName = "tell";
         public static CacheType SessionCaching = CacheType.Disk;