hedgewars/uCollisions.pas
author nemo
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(*
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 * Hedgewars, a free turn based strategy game
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 * Copyright (c) 2005-2008 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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 *)
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{$INCLUDE "options.inc"}
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unit uCollisions;
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interface
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uses uGears, uFloat;
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const cMaxGearArrayInd = 255;
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type 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 TestCollisionXwithGear(Gear: PGear; Dir: LongInt): boolean;
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function TestCollisionYwithGear(Gear: PGear; Dir: LongInt): boolean;
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function TestCollisionXKick(Gear: PGear; Dir: LongInt): boolean;
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function TestCollisionYKick(Gear: PGear; Dir: LongInt): boolean;
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function TestCollisionY(Gear: PGear; Dir: LongInt): boolean;
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function TestCollisionXwithXYShift(Gear: PGear; ShiftX: hwFloat; ShiftY: LongInt; Dir: LongInt): boolean;
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function TestCollisionYwithXYShift(Gear: PGear; ShiftX, ShiftY: LongInt; Dir: LongInt): boolean;
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implementation
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uses uMisc, uConsts, uLand, uLandGraphics, uConsole;
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type TCollisionEntry = record
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			X, Y, Radius: LongInt;
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			cGear: PGear;
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			end;
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const MAXRECTSINDEX = 511;
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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^.CollisionIndex >= 0 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:= hwRound(Gear^.X);
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	Y:= hwRound(Gear^.Y);
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	Radius:= Gear^.Radius;
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	ChangeRoundInLand(X, Y, Radius - 1, true);
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	cGear:= Gear
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	end;
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Gear^.CollisionIndex:= 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^.CollisionIndex >= 0 then
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	begin
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	with cinfos[Gear^.CollisionIndex] do
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		ChangeRoundInLand(X, Y, Radius - 1, false);
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	cinfos[Gear^.CollisionIndex]:= cinfos[Pred(Count)];
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	cinfos[Gear^.CollisionIndex].cGear^.CollisionIndex:= Gear^.CollisionIndex;
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	Gear^.CollisionIndex:= -1;
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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: LongInt;
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	i: Longword;
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begin
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CheckGearsCollision:= @ga;
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ga.Count:= 0;
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if Count = 0 then exit;
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mx:= hwRound(Gear^.X);
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my:= hwRound(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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			(sqr(mx - x) + sqr(my - y) <= sqr(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 TestCollisionXwithGear(Gear: PGear; Dir: LongInt): boolean;
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var x, y, i: LongInt;
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	TestWord: LongWord;
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begin
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if Gear^.IntersectGear <> nil then
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   with Gear^ do
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        if (hwRound(IntersectGear^.X) + IntersectGear^.Radius < hwRound(X) - Radius) or
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           (hwRound(IntersectGear^.X) - IntersectGear^.Radius > hwRound(X) + Radius) then
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           begin
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           IntersectGear:= nil;
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           TestWord:= 0
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           end else
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           TestWord:= 255
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   else TestWord:= 0;
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x:= hwRound(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 LAND_WIDTH_MASK) = 0 then
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   begin
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   y:= hwRound(Gear^.Y) - Gear^.Radius + 1;
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   i:= y + Gear^.Radius * 2 - 2;
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   repeat
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     if (y and LAND_HEIGHT_MASK) = 0 then
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        if Land[y, x] > TestWord then exit(true);
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     inc(y)
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   until (y > i);
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   end;
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TestCollisionXwithGear:= false
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end;
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function TestCollisionYwithGear(Gear: PGear; Dir: LongInt): boolean;
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var x, y, i: LongInt;
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    TestWord: LongWord;
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begin
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if Gear^.IntersectGear <> nil then
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   with Gear^ do
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        if (hwRound(IntersectGear^.Y) + IntersectGear^.Radius < hwRound(Y) - Radius) or
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           (hwRound(IntersectGear^.Y) - IntersectGear^.Radius > hwRound(Y) + Radius) then
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           begin
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           IntersectGear:= nil;
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           TestWord:= 0
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           end else
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           TestWord:= 255
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   else TestWord:= 0;
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y:= hwRound(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 and LAND_HEIGHT_MASK) = 0 then
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   begin
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   x:= hwRound(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 LAND_WIDTH_MASK) = 0 then
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        if Land[y, x] > TestWord then exit(true);
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     inc(x)
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   until (x > i);
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   end;
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TestCollisionYwithGear:= false
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end;
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function TestCollisionXKick(Gear: PGear; Dir: LongInt): boolean;
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var x, y, mx, my, i: LongInt;
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    flag: boolean;
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begin
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flag:= false;
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x:= hwRound(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 LAND_WIDTH_MASK) = 0 then
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   begin
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   y:= hwRound(Gear^.Y) - Gear^.Radius + 1;
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   i:= y + Gear^.Radius * 2 - 2;
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   repeat
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     if (y and LAND_HEIGHT_MASK) = 0 then
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           if Land[y, x] > 255 then exit(true)
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           else if Land[y, x] <> 0 then flag:= true;
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     inc(y)
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   until (y > i);
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   end;
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TestCollisionXKick:= flag;
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if flag then
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   begin
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   if hwAbs(Gear^.dX) < cHHKick then exit;
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   if (Gear^.State and gstHHJumping <> 0)
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   and (hwAbs(Gear^.dX) < _0_4) then exit;
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   mx:= hwRound(Gear^.X);
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   my:= hwRound(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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         (sqr(mx - x) + sqr(my - y) <= sqr(Radius + Gear^.Radius + 2)) and
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         ((mx > x) xor (Dir > 0)) then
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         if (cGear^.Kind in [gtHedgehog, gtMine]) and ((Gear^.State and gstNotKickable) = 0) then
513
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             begin
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             with cGear^ do
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                  begin
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                  dX:= Gear^.dX;
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                  dY:= Gear^.dY * _0_5;
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                  State:= State or gstMoving;
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                  Active:= true
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                  end;
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             DeleteCI(cGear);
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             exit(false)
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             end
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   end
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end;
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function TestCollisionYKick(Gear: PGear; Dir: LongInt): boolean;
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var x, y, mx, my, i: LongInt;
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    flag: boolean;
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begin
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flag:= false;
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y:= hwRound(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 and LAND_HEIGHT_MASK) = 0 then
513
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   begin
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   x:= hwRound(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 LAND_WIDTH_MASK) = 0 then
513
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        if Land[y, x] > 0 then
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           if Land[y, x] > 255 then exit(true)
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           else if Land[y, x] <> 0 then flag:= true;
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     inc(x)
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   until (x > i);
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   end;
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TestCollisionYKick:= flag;
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if flag then
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   begin
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   if hwAbs(Gear^.dY) < cHHKick then exit(true);
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   if (Gear^.State and gstHHJumping <> 0)
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   and (not Gear^.dY.isNegative)
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   and (Gear^.dY < _0_4) then exit;
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513
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   mx:= hwRound(Gear^.X);
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   my:= hwRound(Gear^.Y);
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   254
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   for i:= 0 to Pred(Count) do
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   256
    with cinfos[i] do
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   257
      if (Gear <> cGear) and
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         (sqr(mx - x) + sqr(my - y) <= sqr(Radius + Gear^.Radius + 2)) and
513
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         ((my > y) xor (Dir > 0)) then
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         if (cGear^.Kind in [gtHedgehog, gtMine]) and ((Gear^.State and gstNotKickable) = 0) then
513
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             begin
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   262
             with cGear^ do
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                  begin
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                  dX:= Gear^.dX * _0_5;
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                  dY:= Gear^.dY;
521
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   266
                  State:= State or gstMoving;
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                  Active:= true
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                  end;
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             DeleteCI(cGear);
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             exit(false)
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   271
             end
513
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   end
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end;
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   274
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function TestCollisionXwithXYShift(Gear: PGear; ShiftX: hwFloat; ShiftY: LongInt; Dir: LongInt): boolean;
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begin
351
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Gear^.X:= Gear^.X + ShiftX;
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Gear^.Y:= Gear^.Y + int2hwFloat(ShiftY);
351
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TestCollisionXwithXYShift:= TestCollisionXwithGear(Gear, Dir);
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Gear^.X:= Gear^.X - ShiftX;
498
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Gear^.Y:= Gear^.Y - int2hwFloat(ShiftY)
4
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end;
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   283
371
731ad6d27bd1 integer -> LongInt
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   284
function TestCollisionY(Gear: PGear; Dir: LongInt): boolean;
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   285
var x, y, i: LongInt;
68
cbb93eb90304 Collision-related stuff
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   286
begin
351
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y:= hwRound(Gear^.Y);
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if Dir < 0 then y:= y - Gear^.Radius
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   289
           else y:= y + Gear^.Radius;
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if (y and LAND_HEIGHT_MASK) = 0 then
68
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   291
   begin
351
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   x:= hwRound(Gear^.X) - Gear^.Radius + 1;
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   i:= x + Gear^.Radius * 2 - 2;
68
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   294
   repeat
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   295
     if (x and LAND_WIDTH_MASK) = 0 then
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        if Land[y, x] > 255 then exit(true);
68
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   297
     inc(x)
351
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   until (x > i);
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   299
   end;
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TestCollisionY:= false
68
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   301
end;
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   302
371
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function TestCollisionYwithXYShift(Gear: PGear; ShiftX, ShiftY: LongInt; Dir: LongInt): boolean;
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begin
498
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Gear^.X:= Gear^.X + int2hwFloat(ShiftX);
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Gear^.Y:= Gear^.Y + int2hwFloat(ShiftY);
351
29bc9c36ad5f Fixed-point arithmetics in engine.
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TestCollisionYwithXYShift:= TestCollisionYwithGear(Gear, Dir);
498
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Gear^.X:= Gear^.X - int2hwFloat(ShiftX);
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Gear^.Y:= Gear^.Y - int2hwFloat(ShiftY)
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end;
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end.