--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hedgewars/uGearsHandlers.pas	Sun Jul 08 23:14:24 2012 +0400
@@ -0,0 +1,85 @@
+(*
+ * Hedgewars, a free turn based strategy game
+ * Copyright (c) 2004-2012 Andrey Korotaev <unC0Rr@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
+ *)
+
+{$INCLUDE "options.inc"}
+
+unit uGearsHandlers;
+interface
+
+uses uTypes;
+
+procedure cakeStep(Gear: PGear);
+
+implementation
+
+uses SDLh, uFloat, uCollisions;
+
+const dirs: array[0..3] of TPoint =   ((X: 0; Y: -1), (X: 1; Y: 0),(X: 0; Y: 1),(X: -1; Y: 0));
+
+procedure PrevAngle(Gear: PGear; dA: LongInt); inline;
+begin
+    Gear^.Angle := (LongInt(Gear^.Angle) + 4 - dA) mod 4
+end;
+
+procedure NextAngle(Gear: PGear; dA: LongInt); inline;
+begin
+    Gear^.Angle := (LongInt(Gear^.Angle) + 4 + dA) mod 4
+end;
+
+procedure cakeStep(Gear: PGear);
+var
+    xx, yy, xxn, yyn: LongInt;
+    dA: LongInt;
+    tdx, tdy: hwFloat;
+begin
+    dA := hwSign(Gear^.dX);
+    xx := dirs[Gear^.Angle].x;
+    yy := dirs[Gear^.Angle].y;
+    xxn := dirs[(LongInt(Gear^.Angle) + 4 + dA) mod 4].x;
+    yyn := dirs[(LongInt(Gear^.Angle) + 4 + dA) mod 4].y;
+
+    if (xx = 0) then
+        if TestCollisionYwithGear(Gear, yy) <> 0 then
+            PrevAngle(Gear, dA)
+    else
+        begin
+        Gear^.Tag := 0;
+        Gear^.Y := Gear^.Y + int2hwFloat(yy);
+        if not TestCollisionXwithGear(Gear, xxn) then
+            begin
+            Gear^.X := Gear^.X + int2hwFloat(xxn);
+            NextAngle(Gear, dA)
+            end;
+        end;
+
+    if (yy = 0) then
+        if TestCollisionXwithGear(Gear, xx) then
+            PrevAngle(Gear, dA)
+    else
+        begin
+        Gear^.Tag := 0;
+        Gear^.X := Gear^.X + int2hwFloat(xx);
+        if TestCollisionYwithGear(Gear, yyn) = 0 then
+            begin
+            Gear^.Y := Gear^.Y + int2hwFloat(yyn);
+            NextAngle(Gear, dA)
+            end;
+        end;
+end;
+
+end.