select cursor support, better selection

OpenRa.Game/Controller.cs

@@ -42,18 +42,21 @@ namespace OpenRa.Game
 				if (!(orderGenerator is PlaceBuilding))
 				{
 					if (dragStart != xy)
-						orderGenerator = new UnitOrderGenerator( game.FindUnits( Game.CellSize * dragStart, Game.CellSize * xy ) ); /* band-box select */
+						orderGenerator = new UnitOrderGenerator( 
+							game.SelectUnitsInBox( Game.CellSize * dragStart, Game.CellSize * xy ) );
 					else
-						orderGenerator = new UnitOrderGenerator( game.FindUnits( Game.CellSize * xy, Game.CellSize * xy ) );  /* click select */
+						orderGenerator = new UnitOrderGenerator( 
+							game.SelectUnitOrBuilding( Game.CellSize * xy ) );
 				}
 
-				dragStart = dragEnd;
+				dragStart = dragEnd = xy;
             }
 
             if (mi.Button == MouseButtons.None && mi.Event == MouseInputEvent.Move)
             {
                 /* update the cursor to reflect the thing under us - note this 
-                 * needs to also happen when the *thing* changes, so per-frame hook */
+                 * needs to also happen when the *thing* changes, so per-frame hook */
+				dragStart = dragEnd = xy;
             }
 
 			if( mi.Button == MouseButtons.Right && mi.Event == MouseInputEvent.Down )
@@ -69,6 +72,19 @@ namespace OpenRa.Game
 				if (dragStart == dragEnd) return null;
 				return Pair.New(Game.CellSize * dragStart, Game.CellSize * dragEnd);
 			}
-        }
+        }
+
+		public Cursor ChooseCursor()
+		{
+			var uog = orderGenerator as UnitOrderGenerator;
+
+			if (uog != null && uog.selection.Count > 0 && uog.selection.Any(a => a.traits.Contains<Traits.Mobile>()))
+				return Cursor.Move;
+
+			if (game.SelectUnitOrBuilding(Game.CellSize * dragEnd).Any())
+				return Cursor.Select;
+			
+			return Cursor.Default;
+		}
 	}
 }

OpenRa.Game/Cursor.cs

@@ -18,14 +18,8 @@ namespace OpenRa.Game
 		public Sprite GetSprite(int frame) { return sequence.GetSprite(frame); }
 		public int2 GetHotspot() { return sequence.Hotspot; }
 
-		public static Cursor Default
-		{
-			get { return new Cursor("default"); }
-		}
-
-		public static Cursor Move
-		{
-			get { return new Cursor("move"); }
-		}
+		public static Cursor Default { get { return new Cursor("default"); } }
+		public static Cursor Move { get { return new Cursor("move"); } }
+		public static Cursor Select { get { return new Cursor("select"); } }
 	}
 }

OpenRa.Game/Game.cs

@@ -131,17 +131,28 @@ namespace OpenRa.Game
 			return map.IsInMap(a.X, a.Y) &&
 				TerrainCosts.Cost(UnitMovementType.Wheel,
 					terrain.tileSet.GetWalkability(map.MapTiles[a.X, a.Y])) < double.PositiveInfinity;
+		}
+
+		IEnumerable<Actor> FindUnits(float2 a, float2 b)
+		{
+			var min = float2.Min(a, b);
+			var max = float2.Max(a, b);
+
+			var rect = new RectangleF(min.X, min.Y, max.X - min.X, max.Y - min.Y);
+
+			return world.Actors
+				.Where(x => x.Bounds.IntersectsWith(rect));
 		}
 
-		public IEnumerable<Actor> FindUnits(float2 a, float2 b)
-		{
-			var min = float2.Min(a, b);
-			var max = float2.Max(a, b);
-
-			var rect = new RectangleF(min.X, min.Y, max.X - min.X, max.Y - min.Y);
-
-			return world.Actors
-				.Where(x => (x.Owner == LocalPlayer) && (x.Bounds.IntersectsWith(rect)));
+		public IEnumerable<Actor> SelectUnitsInBox(float2 a, float2 b)
+		{
+			return FindUnits(a, b).Where(x => x.Owner == LocalPlayer && x.traits.Contains<Traits.Mobile>());
+		}
+
+		public IEnumerable<Actor> SelectUnitOrBuilding(float2 a)
+		{
+			var q = FindUnits(a, a);
+			return q.Where(x => x.traits.Contains<Traits.Mobile>()).Concat(q).Take(1);
 		}
 	}
 }

OpenRa.Game/Graphics/WorldRenderer.cs

@@ -75,7 +75,7 @@ namespace OpenRa.Game.Graphics
                 lineRenderer.DrawLine(a + b + c, a + c, Color.White, Color.White);
                 lineRenderer.DrawLine(a, a + c, Color.White, Color.White);
 
-                foreach (var u in game.FindUnits(selbox.Value.First, selbox.Value.Second))
+                foreach (var u in game.SelectUnitsInBox(selbox.Value.First, selbox.Value.Second))
                     DrawSelectionBox(u, Color.Yellow, false);
             }
 

OpenRa.Game/MainWindow.cs

@@ -80,9 +80,7 @@ using System.Runtime.InteropServices;
 				game.Tick();
 
 				// rude hack
-				game.viewport.cursor = (game.controller.orderGenerator is UnitOrderGenerator)
-					&& (game.controller.orderGenerator as UnitOrderGenerator).selection.Count > 0
-					? OpenRa.Game.Cursor.Move : OpenRa.Game.Cursor.Default;
+				game.viewport.cursor = game.controller.ChooseCursor();
 
 				Application.DoEvents();
 			}

sequences.xml

@@ -332,7 +332,7 @@
 		<sequence name="scroll-blocked" start="9" />
 		<sequence name="move" start="10" length="4" x="12" y="12"/>
 		<sequence name="move-blocked" start="14" />
-		<sequence name="select" start="15" length="6" />
+		<sequence name="select" start="15" length="6" x="12" y="12"/>
 		<sequence name="attack" start="21" length="8" />
 		<sequence name="move-minimap" start="29" length="6" />
 		<sequence name="repair" start="35" length="24" />