(*
* Hedgewars, a free turn based strategy game
* Copyright (c) 2005-2008 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
*)
unit uCollisions;
interface
uses uGears, uFloat;
{$INCLUDE options.inc}
const cMaxGearArrayInd = 255;
type PGearArray = ^TGearArray;
TGearArray = record
ar: array[0..cMaxGearArrayInd] of PGear;
Count: Longword
end;
procedure AddGearCI(Gear: PGear);
procedure DeleteCI(Gear: PGear);
function CheckGearsCollision(Gear: PGear): PGearArray;
function TestCollisionXwithGear(Gear: PGear; Dir: LongInt): boolean;
function TestCollisionYwithGear(Gear: PGear; Dir: LongInt): boolean;
function TestCollisionXKick(Gear: PGear; Dir: LongInt): boolean;
function TestCollisionYKick(Gear: PGear; Dir: LongInt): boolean;
function TestCollisionY(Gear: PGear; Dir: LongInt): boolean;
function TestCollisionXwithXYShift(Gear: PGear; ShiftX: hwFloat; ShiftY: LongInt; Dir: LongInt): boolean;
function TestCollisionYwithXYShift(Gear: PGear; ShiftX, ShiftY: LongInt; Dir: LongInt): boolean;
implementation
uses uMisc, uConsts, uLand, uLandGraphics, uConsole;
type TCollisionEntry = record
X, Y, Radius: LongInt;
cGear: PGear;
end;
const MAXRECTSINDEX = 511;
var Count: Longword = 0;
cinfos: array[0..MAXRECTSINDEX] of TCollisionEntry;
ga: TGearArray;
procedure AddGearCI(Gear: PGear);
begin
if Gear^.CollisionIndex >= 0 then exit;
TryDo(Count <= MAXRECTSINDEX, 'Collision rects array overflow', true);
with cinfos[Count] do
begin
X:= hwRound(Gear^.X);
Y:= hwRound(Gear^.Y);
Radius:= Gear^.Radius;
ChangeRoundInLand(X, Y, Radius - 1, true);
cGear:= Gear
end;
Gear^.CollisionIndex:= Count;
inc(Count)
end;
procedure DeleteCI(Gear: PGear);
begin
if Gear^.CollisionIndex >= 0 then
begin
with cinfos[Gear^.CollisionIndex] do
ChangeRoundInLand(X, Y, Radius - 1, false);
cinfos[Gear^.CollisionIndex]:= cinfos[Pred(Count)];
cinfos[Gear^.CollisionIndex].cGear^.CollisionIndex:= Gear^.CollisionIndex;
Gear^.CollisionIndex:= -1;
dec(Count)
end;
end;
function CheckGearsCollision(Gear: PGear): PGearArray;
var mx, my: LongInt;
i: Longword;
begin
CheckGearsCollision:= @ga;
ga.Count:= 0;
if Count = 0 then exit;
mx:= hwRound(Gear^.X);
my:= hwRound(Gear^.Y);
for i:= 0 to Pred(Count) do
with cinfos[i] do
if (Gear <> cGear) and
(sqr(mx - x) + sqr(my - y) <= sqr(Radius + Gear^.Radius)) then
begin
ga.ar[ga.Count]:= cinfos[i].cGear;
inc(ga.Count)
end
end;
function TestCollisionXwithGear(Gear: PGear; Dir: LongInt): boolean;
var x, y, i: LongInt;
TestWord: LongWord;
begin
if Gear^.IntersectGear <> nil then
with Gear^ do
if (hwRound(IntersectGear^.X) + IntersectGear^.Radius < hwRound(X) - Radius) or
(hwRound(IntersectGear^.X) - IntersectGear^.Radius > hwRound(X) + Radius) then
begin
IntersectGear:= nil;
TestWord:= 0
end else
TestWord:= 255
else TestWord:= 0;
x:= hwRound(Gear^.X);
if Dir < 0 then x:= x - Gear^.Radius
else x:= x + Gear^.Radius;
if (x and LAND_WIDTH_MASK) = 0 then
begin
y:= hwRound(Gear^.Y) - Gear^.Radius + 1;
i:= y + Gear^.Radius * 2 - 2;
repeat
if (y and LAND_HEIGHT_MASK) = 0 then
if Land[y, x] > TestWord then exit(true);
inc(y)
until (y > i);
end;
TestCollisionXwithGear:= false
end;
function TestCollisionYwithGear(Gear: PGear; Dir: LongInt): boolean;
var x, y, i: LongInt;
TestWord: LongWord;
begin
if Gear^.IntersectGear <> nil then
with Gear^ do
if (hwRound(IntersectGear^.Y) + IntersectGear^.Radius < hwRound(Y) - Radius) or
(hwRound(IntersectGear^.Y) - IntersectGear^.Radius > hwRound(Y) + Radius) then
begin
IntersectGear:= nil;
TestWord:= 0
end else
TestWord:= 255
else TestWord:= 0;
y:= hwRound(Gear^.Y);
if Dir < 0 then y:= y - Gear^.Radius
else y:= y + Gear^.Radius;
if (y and LAND_HEIGHT_MASK) = 0 then
begin
x:= hwRound(Gear^.X) - Gear^.Radius + 1;
i:= x + Gear^.Radius * 2 - 2;
repeat
if (x and LAND_WIDTH_MASK) = 0 then
if Land[y, x] > TestWord then exit(true);
inc(x)
until (x > i);
end;
TestCollisionYwithGear:= false
end;
function TestCollisionXKick(Gear: PGear; Dir: LongInt): boolean;
var x, y, mx, my, i: LongInt;
flag: boolean;
begin
flag:= false;
x:= hwRound(Gear^.X);
if Dir < 0 then x:= x - Gear^.Radius
else x:= x + Gear^.Radius;
if (x and LAND_WIDTH_MASK) = 0 then
begin
y:= hwRound(Gear^.Y) - Gear^.Radius + 1;
i:= y + Gear^.Radius * 2 - 2;
repeat
if (y and LAND_HEIGHT_MASK) = 0 then
if Land[y, x] > 255 then exit(true)
else if Land[y, x] <> 0 then flag:= true;
inc(y)
until (y > i);
end;
TestCollisionXKick:= flag;
if flag then
begin
if hwAbs(Gear^.dX) < cHHKick then exit;
if (Gear^.State and gstHHJumping <> 0)
and (hwAbs(Gear^.dX) < _0_4) then exit;
mx:= hwRound(Gear^.X);
my:= hwRound(Gear^.Y);
for i:= 0 to Pred(Count) do
with cinfos[i] do
if (Gear <> cGear) and
(sqr(mx - x) + sqr(my - y) <= sqr(Radius + Gear^.Radius + 2)) and
((mx > x) xor (Dir > 0)) then
if (cGear^.Kind in [gtHedgehog, gtMine]) and ((Gear^.State and gstNotKickable) = 0) then
begin
with cGear^ do
begin
dX:= Gear^.dX;
dY:= Gear^.dY * _0_5;
State:= State or gstMoving;
Active:= true
end;
DeleteCI(cGear);
exit(false)
end
end
end;
function TestCollisionYKick(Gear: PGear; Dir: LongInt): boolean;
var x, y, mx, my, i: LongInt;
flag: boolean;
begin
flag:= false;
y:= hwRound(Gear^.Y);
if Dir < 0 then y:= y - Gear^.Radius
else y:= y + Gear^.Radius;
if (y and LAND_HEIGHT_MASK) = 0 then
begin
x:= hwRound(Gear^.X) - Gear^.Radius + 1;
i:= x + Gear^.Radius * 2 - 2;
repeat
if (x and LAND_WIDTH_MASK) = 0 then
if Land[y, x] > 0 then
if Land[y, x] > 255 then exit(true)
else if Land[y, x] <> 0 then flag:= true;
inc(x)
until (x > i);
end;
TestCollisionYKick:= flag;
if flag then
begin
if hwAbs(Gear^.dY) < cHHKick then exit(true);
if (Gear^.State and gstHHJumping <> 0)
and (not Gear^.dY.isNegative)
and (Gear^.dY < _0_4) then exit;
mx:= hwRound(Gear^.X);
my:= hwRound(Gear^.Y);
for i:= 0 to Pred(Count) do
with cinfos[i] do
if (Gear <> cGear) and
(sqr(mx - x) + sqr(my - y) <= sqr(Radius + Gear^.Radius + 2)) and
((my > y) xor (Dir > 0)) then
if (cGear^.Kind in [gtHedgehog, gtMine]) and ((Gear^.State and gstNotKickable) = 0) then
begin
with cGear^ do
begin
dX:= Gear^.dX * _0_5;
dY:= Gear^.dY;
State:= State or gstMoving;
Active:= true
end;
DeleteCI(cGear);
exit(false)
end
end
end;
function TestCollisionXwithXYShift(Gear: PGear; ShiftX: hwFloat; ShiftY: LongInt; Dir: LongInt): boolean;
begin
Gear^.X:= Gear^.X + ShiftX;
Gear^.Y:= Gear^.Y + int2hwFloat(ShiftY);
TestCollisionXwithXYShift:= TestCollisionXwithGear(Gear, Dir);
Gear^.X:= Gear^.X - ShiftX;
Gear^.Y:= Gear^.Y - int2hwFloat(ShiftY)
end;
function TestCollisionY(Gear: PGear; Dir: LongInt): boolean;
var x, y, i: LongInt;
begin
y:= hwRound(Gear^.Y);
if Dir < 0 then y:= y - Gear^.Radius
else y:= y + Gear^.Radius;
if (y and LAND_HEIGHT_MASK) = 0 then
begin
x:= hwRound(Gear^.X) - Gear^.Radius + 1;
i:= x + Gear^.Radius * 2 - 2;
repeat
if (x and LAND_WIDTH_MASK) = 0 then
if Land[y, x] > 255 then exit(true);
inc(x)
until (x > i);
end;
TestCollisionY:= false
end;
function TestCollisionYwithXYShift(Gear: PGear; ShiftX, ShiftY: LongInt; Dir: LongInt): boolean;
begin
Gear^.X:= Gear^.X + int2hwFloat(ShiftX);
Gear^.Y:= Gear^.Y + int2hwFloat(ShiftY);
TestCollisionYwithXYShift:= TestCollisionYwithGear(Gear, Dir);
Gear^.X:= Gear^.X - int2hwFloat(ShiftX);
Gear^.Y:= Gear^.Y - int2hwFloat(ShiftY)
end;
end.