(*

 * 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.