hedgewars/uGearsHandlers.pas
author sheepluva
Wed, 15 Jul 2015 00:27:12 +0200
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(*
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 * Hedgewars, a free turn based strategy game
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 * Copyright (c) 2004-2014 Andrey Korotaev <unC0Rr@gmail.com>
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 *
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 * This program is free software; you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License as published by
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 * the Free Software Foundation; version 2 of the License
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
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 * along with this program; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
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 *)
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{$INCLUDE "options.inc"}
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unit uGearsHandlers;
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interface
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uses uTypes;
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function cakeStep(Gear: PGear): boolean;
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implementation
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uses SDLh, uFloat, uCollisions;
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const dirs: array[0..3] of TPoint = ((x: 0;  y: -1),
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                                     (x: 1;  y:  0),
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                                     (x: 0;  y:  1),
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                                     (x: -1; y:  0));
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procedure PrevAngle(Gear: PGear; dA: LongInt); inline;
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begin
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    inc(Gear^.WDTimer);
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    Gear^.Angle := (LongInt(Gear^.Angle) - dA) and 3
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end;
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procedure NextAngle(Gear: PGear; dA: LongInt); inline;
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begin
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    inc(Gear^.WDTimer);
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    Gear^.Angle := (LongInt(Gear^.Angle) + dA) and 3
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end;
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function cakeStep(Gear: PGear): boolean;
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var
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    xx, yy, xxn, yyn: LongInt;
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    dA: LongInt;
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begin
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    dA := hwSign(Gear^.dX);
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    xx := dirs[Gear^.Angle].x;
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    yy := dirs[Gear^.Angle].y;
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    xxn := dirs[(LongInt(Gear^.Angle) + dA) and 3].x;
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    yyn := dirs[(LongInt(Gear^.Angle) + dA) and 3].y;
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    if (xx = 0) then
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        if TestCollisionYwithGear(Gear, yy) <> 0 then
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            PrevAngle(Gear, dA)
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        else
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            begin
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            Gear^.Tag := 0;
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            if TestCollisionXwithGear(Gear, xxn) <> 0 then
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                Gear^.WDTimer:= 0;
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            Gear^.Y := Gear^.Y + int2hwFloat(yy);
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            if TestCollisionXwithGear(Gear, xxn) = 0 then
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                begin
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                Gear^.X := Gear^.X + int2hwFloat(xxn);
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                NextAngle(Gear, dA)
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                end
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            end;
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    if (yy = 0) then
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        if TestCollisionXwithGear(Gear, xx) <> 0 then
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            PrevAngle(Gear, dA)
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        else
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            begin
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            Gear^.Tag := 0;
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            if TestCollisionYwithGear(Gear, yyn) <> 0 then
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                Gear^.WDTimer:= 0;
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            Gear^.X := Gear^.X + int2hwFloat(xx);
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            if TestCollisionYwithGear(Gear, yyn) = 0 then
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                begin
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                Gear^.Y := Gear^.Y + int2hwFloat(yyn);
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                NextAngle(Gear, dA)
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                end
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            end;
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    cakeStep:= Gear^.WDTimer < 4
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end;
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end.