hedgewars/uCollisions.pas
author unc0rr
Sun, 05 Feb 2006 18:51:54 +0000
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permissions -rw-r--r--
No more hedgehogs hung in air
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(*
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 * Hedgewars, a worms-like game
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 * Copyright (c) 2005 Andrey Korotaev <unC0Rr@gmail.com>
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 *
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 * Distributed under the terms of the BSD-modified licence:
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 *
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 * Permission is hereby granted, free of charge, to any person obtaining a copy
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 * of this software and associated documentation files (the "Software"), to deal
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 * with the Software without restriction, including without limitation the
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 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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 * sell copies of the Software, and to permit persons to whom the Software is
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 * furnished to do so, subject to the following conditions:
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 *
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 * 1. Redistributions of source code must retain the above copyright notice,
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 *    this list of conditions and the following disclaimer.
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 * 2. Redistributions in binary form must reproduce the above copyright notice,
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 *    this list of conditions and the following disclaimer in the documentation
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 *    and/or other materials provided with the distribution.
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 * 3. The name of the author may not be used to endorse or promote products
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 *    derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 *)
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unit uCollisions;
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interface
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uses uGears;
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{$INCLUDE options.inc}
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const cMaxGearArrayInd = 255;
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type TDirection = record
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                  dX, dY: integer
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                  end;
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     PGearArray = ^TGearArray;
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     TGearArray = record
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                  ar: array[0..cMaxGearArrayInd] of PGear;
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                  Count: Longword
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                  end;
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procedure AddGearCI(Gear: PGear);
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procedure DeleteCI(Gear: PGear);
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function CheckGearsCollision(Gear: PGear): PGearArray;
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function  HHTestCollisionYwithGear(Gear: PGear; Dir: integer): boolean;
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function TestCollisionXwithGear(Gear: PGear; Dir: integer): boolean;
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function TestCollisionYwithGear(Gear: PGear; Dir: integer): boolean;
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function TestCollisionXwithXYShift(Gear: PGear; ShiftX, ShiftY: integer; Dir: integer): boolean;
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function TestCollisionYwithXYShift(Gear: PGear; ShiftX, ShiftY: integer; Dir: integer): boolean;
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implementation
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uses uMisc, uConsts, uLand, uLandGraphics;
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type TCollisionEntry = record
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                       X, Y, Radius: integer;
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                       cGear: PGear;
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                       end;
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const MAXRECTSINDEX = 255;
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var Count: Longword = 0;
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    cinfos: array[0..MAXRECTSINDEX] of TCollisionEntry;
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    ga: TGearArray;
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procedure AddGearCI(Gear: PGear);
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begin
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if Gear.CollIndex < High(Longword) then exit;
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TryDo(Count <= MAXRECTSINDEX, 'Collision rects array overflow', true);
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with cinfos[Count] do
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     begin
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     X:= round(Gear.X);
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     Y:= round(Gear.Y);
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     Radius:= Gear.Radius;
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     FillRoundInLand(X, Y, Radius-1, $FF);
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     cGear:= Gear
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     end;
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Gear.CollIndex:= Count;
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inc(Count)
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end;
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procedure DeleteCI(Gear: PGear);
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begin
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if Gear.CollIndex < Count then
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   begin
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   with cinfos[Gear.CollIndex] do FillRoundInLand(X, Y, Radius-1, 0);
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   cinfos[Gear.CollIndex]:= cinfos[Pred(Count)];
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   cinfos[Gear.CollIndex].cGear.CollIndex:= Gear.CollIndex;
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   Gear.CollIndex:= High(Longword);
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   dec(Count)
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   end;
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end;
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function CheckGearsCollision(Gear: PGear): PGearArray;
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var mx, my: integer;
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    i: Longword;
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begin
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Result:= @ga;
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ga.Count:= 0;
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if Count = 0 then exit;
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mx:= round(Gear.X);
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my:= round(Gear.Y);
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for i:= 0 to Pred(Count) do
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   with cinfos[i] do
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      if (Gear <> cGear) and
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         (sqrt(sqr(mx - x) + sqr(my - y)) <= Radius + Gear.Radius) then
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             begin
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             ga.ar[ga.Count]:= cinfos[i].cGear;
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             inc(ga.Count)
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             end;
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end;
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function HHTestCollisionYwithGear(Gear: PGear; Dir: integer): boolean;
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var x, y, i: integer;
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begin
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Result:= false;
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y:= round(Gear.Y);
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if Dir < 0 then y:= y - Gear.Radius
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           else y:= y + Gear.Radius;
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if ((y - Dir) and $FFFFFC00) = 0 then
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   begin
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   x:= round(Gear.X);
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   if (((x - Gear.Radius) and $FFFFF800) = 0)and(Land[y - Dir, x - Gear.Radius] <> 0)
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    or(((x + Gear.Radius) and $FFFFF800) = 0)and(Land[y - Dir, x + Gear.Radius] <> 0) then
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      begin
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      Result:= true;
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      exit
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      end
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    end;
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if (y and $FFFFFC00) = 0 then
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   begin
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   x:= round(Gear.X) - Gear.Radius + 1;
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   i:= x + Gear.Radius * 2 - 2;
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   repeat
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     if (x and $FFFFF800) = 0 then Result:= Land[y, x]<>0;
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     inc(x)
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   until (x > i) or Result
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   end
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end;
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function TestCollisionXwithGear(Gear: PGear; Dir: integer): boolean;
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var x, y, i: integer;
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begin
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Result:= false;
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x:= round(Gear.X);
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if Dir < 0 then x:= x - Gear.Radius
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           else x:= x + Gear.Radius;
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if (x and $FFFFF800) = 0 then
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   begin
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   y:= round(Gear.Y) - Gear.Radius + 1; {*}
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   i:= y + Gear.Radius * 2 - 2;         {*}
4
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   repeat
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     if (y and $FFFFFC00) = 0 then Result:= Land[y, x]<>0;
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     inc(y)
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   until (y > i) or Result;
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   end
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end;
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function TestCollisionXwithXYShift(Gear: PGear; ShiftX, ShiftY: integer; Dir: integer): boolean;
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begin
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Gear.X:= Gear.X + ShiftX;
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Gear.Y:= Gear.Y + ShiftY;
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Result:= TestCollisionXwithGear(Gear, Dir);
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Gear.X:= Gear.X - ShiftX;
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Gear.Y:= Gear.Y - ShiftY
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end;
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function TestCollisionYwithGear(Gear: PGear; Dir: integer): boolean;
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var x, y, i: integer;
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begin
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Result:= false;
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y:= round(Gear.Y);
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if Dir < 0 then y:= y - Gear.Radius
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           else y:= y + Gear.Radius;
4
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if (y and $FFFFFC00) = 0 then
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   begin
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   x:= round(Gear.X) - Gear.Radius + 1;    {*}
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   i:= x + Gear.Radius * 2 - 2;            {*}
4
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   repeat
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     if (x and $FFFFF800) = 0 then Result:= Land[y, x]<>0;
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     inc(x)
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   until (x > i) or Result;
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   end
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end;
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function TestCollisionYwithXYShift(Gear: PGear; ShiftX, ShiftY: integer; Dir: integer): boolean;
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begin
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Gear.X:= Gear.X + ShiftX;
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Gear.Y:= Gear.Y + ShiftY;
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Result:= TestCollisionYwithGear(Gear, Dir);
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Gear.X:= Gear.X - ShiftX;
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Gear.Y:= Gear.Y - ShiftY
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end;
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end.