hedgewars/uLandObjects.pas
author displacer
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(*
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 * Hedgewars, a worms-like game
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 * Copyright (c) 2005-2007 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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unit uLandObjects;
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interface
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uses SDLh;
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{$include options.inc}
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procedure AddObjects(InSurface, Surface: PSDL_Surface);
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procedure BlitImageAndGenerateCollisionInfo(cpX, cpY: Longword; Image, Surface: PSDL_Surface);
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implementation
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uses uLand, uStore, uConsts, uMisc, uConsole, uRandom;
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const MaxRects = 256;
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      MAXOBJECTRECTS = 16;
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      MAXTHEMEOBJECTS = 32;
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type PRectArray = ^TRectsArray;
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     TRectsArray = array[0..MaxRects] of TSDL_Rect;
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     TThemeObject = record
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                    Surf: PSDL_Surface;
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                    inland: TSDL_Rect;
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                    outland: array[0..Pred(MAXOBJECTRECTS)] of TSDL_Rect;
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                    rectcnt: Longword;
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                    Width, Height: Longword;
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                    Maxcnt: Longword;
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                    end;
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     TThemeObjects = record
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                     Count: LongInt;
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                     objs: array[0..Pred(MAXTHEMEOBJECTS)] of TThemeObject;
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                     end;
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     TSprayObject = record
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                    Surf: PSDL_Surface;
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                    Width, Height: Longword;
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                    Maxcnt: Longword;
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                    end;
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     TSprayObjects = record
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                     Count: LongInt;
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                     objs: array[0..Pred(MAXTHEMEOBJECTS)] of TSprayObject
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                     end;
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var Rects: PRectArray;
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    RectCount: Longword;
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procedure BlitImageAndGenerateCollisionInfo(cpX, cpY: Longword; Image, Surface: PSDL_Surface);
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var p: PByteArray;
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    x, y: Longword;
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    bpp: LongInt;
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    r: TSDL_Rect;
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begin
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r.x:= cpX;
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r.y:= cpY;
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SDL_UpperBlit(Image, nil, Surface, @r);
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WriteToConsole('Generating collision info... ');
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if SDL_MustLock(Image) then
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   SDLTry(SDL_LockSurface(Image) >= 0, true);
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bpp:= Image^.format^.BytesPerPixel;
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WriteToConsole('('+inttostr(bpp)+') ');
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p:= Image^.pixels;
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case bpp of
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     1: OutError('We don''t work with 8 bit surfaces', true);
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     2: for y:= 0 to Pred(Image^.h) do
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            begin
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            for x:= 0 to Pred(Image^.w) do
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                if PWord(@(p^[x * 2]))^ <> 0 then Land[cpY + y, cpX + x]:= COLOR_LAND;
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            p:= @(p^[Image^.pitch]);
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            end;
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     3: for y:= 0 to Pred(Image^.h) do
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            begin
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            for x:= 0 to Pred(Image^.w) do
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                if  (p^[x * 3 + 0] <> 0)
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                 or (p^[x * 3 + 1] <> 0)
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                 or (p^[x * 3 + 2] <> 0) then Land[cpY + y, cpX + x]:= COLOR_LAND;
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            p:= @(p^[Image^.pitch]);
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            end;
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     4: for y:= 0 to Pred(Image^.h) do
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            begin
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            for x:= 0 to Pred(Image^.w) do
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                if PLongword(@(p^[x * 4]))^ <> 0 then Land[cpY + y, cpX + x]:= COLOR_LAND;
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            p:= @(p^[Image^.pitch]);
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            end;
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     end;
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if SDL_MustLock(Image) then
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   SDL_UnlockSurface(Image);
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WriteLnToConsole(msgOK)
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end;
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procedure AddRect(x1, y1, w1, h1: LongInt);
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begin
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with Rects^[RectCount] do
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     begin
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     x:= x1;
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     y:= y1;
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     w:= w1;
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     h:= h1
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     end;
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inc(RectCount);
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TryDo(RectCount < MaxRects, 'AddRect: overflow', true)
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end;
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procedure InitRects;
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begin
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RectCount:= 0;
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New(Rects)
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end;
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procedure FreeRects;
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begin
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Dispose(rects)
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end;
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function CheckIntersect(x1, y1, w1, h1: LongInt): boolean;
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var i: Longword;
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    Result: boolean;
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begin
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Result:= false;
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i:= 0;
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if RectCount > 0 then
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   repeat
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   with Rects^[i] do
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        Result:= (x < x1 + w1) and (x1 < x + w) and
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                 (y < y1 + h1) and (y1 < y + h);
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   inc(i)
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   until (i = RectCount) or (Result);
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CheckIntersect:= Result
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end;
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function AddGirder(gX: LongInt; Surface: PSDL_Surface): boolean;
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var tmpsurf: PSDL_Surface;
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    x1, x2, y, k, i: LongInt;
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    r, rr: TSDL_Rect;
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    Result: boolean;
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    function CountNonZeroz(x, y: LongInt): Longword;
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    var i: LongInt;
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        Result: Longword;
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    begin
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    Result:= 0;
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    for i:= y to y + 15 do
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        if Land[i, x] <> 0 then inc(Result);
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    CountNonZeroz:= Result
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    end;
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begin
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y:= 150;
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repeat
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  inc(y, 24);
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  x1:= gX;
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  x2:= gX;
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  while (x1 > 100) and (CountNonZeroz(x1, y) = 0) do dec(x1, 2);
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  i:= x1 - 12;
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  repeat
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    k:= CountNonZeroz(x1, y);
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    dec(x1, 2)
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  until (x1 < 100) or (k = 0) or (k = 16) or (x1 < i);
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  inc(x1, 2);
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  if k = 16 then
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     begin
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     while (x2 < 1900) and (CountNonZeroz(x2, y) = 0) do inc(x2, 2);
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     i:= x2 + 12;
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     repeat
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       k:= CountNonZeroz(x2, y);
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       inc(x2, 2)
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     until (x2 > 1900) or (k = 0) or (k = 16) or (x2 > i);
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     if (x2 < 1900) and (k = 16) and (x2 - x1 > 250)
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        and not CheckIntersect(x1 - 32, y - 64, x2 - x1 + 64, 144) then break;
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     end;
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x1:= 0;
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until y > 900;
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if x1 > 0 then
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   begin
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   Result:= true;
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   tmpsurf:= LoadImage(Pathz[ptGraphics] + '/Girder', false, true, true);
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   rr.x:= x1;
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   rr.y:= y;
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   while rr.x + 100 < x2 do
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         begin
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         SDL_UpperBlit(tmpsurf, nil, Surface, @rr);
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         inc(rr.x, 100);
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         end;
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   r.x:= 0;
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   r.y:= 0;
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   r.w:= x2 - rr.x;
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   r.h:= 16;
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   SDL_UpperBlit(tmpsurf, @r, Surface, @rr);
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   SDL_FreeSurface(tmpsurf);
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   AddRect(x1 - 8, y - 32, x2 - x1 + 16, 80);
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   for k:= y to y + 15 do
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       for i:= x1 to x2 do Land[k, i]:= $FFFFFF
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   end else Result:= false;
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AddGirder:= Result
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end;
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function CheckLand(rect: TSDL_Rect; dX, dY, Color: Longword): boolean;
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var i: Longword;
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    Result: boolean;
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begin
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Result:= true;
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inc(rect.x, dX);
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inc(rect.y, dY);
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i:= 0;
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{$WARNINGS OFF}
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while (i <= rect.w) and Result do
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      begin
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      Result:= (Land[rect.y, rect.x + i] = Color) and (Land[rect.y + rect.h, rect.x + i] = Color);
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      inc(i)
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      end;
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i:= 0;
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while (i <= rect.h) and Result do
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      begin
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      Result:= (Land[rect.y + i, rect.x] = Color) and (Land[rect.y + i, rect.x + rect.w] = Color);
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      inc(i)
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      end;
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{$WARNINGS ON}
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CheckLand:= Result
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end;
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function CheckCanPlace(x, y: Longword; var Obj: TThemeObject): boolean;
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var i: Longword;
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    Result: boolean;
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begin
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with Obj do
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     if CheckLand(inland, x, y, $FFFFFF) then
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        begin
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        Result:= true;
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        i:= 1;
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        while Result and (i <= rectcnt) do
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              begin
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              Result:= CheckLand(outland[i], x, y, 0);
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              inc(i)
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              end;
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        if Result then
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           Result:= not CheckIntersect(x, y, Width, Height)
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        end else
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        Result:= false;
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CheckCanPlace:= Result
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end;
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function TryPut(var Obj: TThemeObject; Surface: PSDL_Surface): boolean; overload;
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const MaxPointsIndex = 2047;
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var x, y: Longword;
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    ar: array[0..MaxPointsIndex] of TPoint;
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    cnt, i: Longword;
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    Result: boolean;
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begin
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cnt:= 0;
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with Obj do
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     begin
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     if Maxcnt = 0 then
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        exit(false);
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     x:= 0;
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     repeat
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         y:= 0;
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         repeat
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             if CheckCanPlace(x, y, Obj) then
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                begin
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                ar[cnt].x:= x;
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                ar[cnt].y:= y;
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                inc(cnt);
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                if cnt > MaxPointsIndex then // buffer is full, do not check the rest land
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                   begin
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                   y:= 5000;
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                   x:= 5000;
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                   end
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                end;
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             inc(y, 3);
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         until y > 1023 - Height;
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         inc(x, getrandom(6) + 3)
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     until x > 2047 - Width;
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     Result:= cnt <> 0;
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     if Result then
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        begin
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        i:= getrandom(cnt);
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        BlitImageAndGenerateCollisionInfo(ar[i].x, ar[i].y, Obj.Surf, Surface);
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        AddRect(ar[i].x, ar[i].y, Width, Height);
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        dec(Maxcnt)
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        end else Maxcnt:= 0
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     end;
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TryPut:= Result
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end;
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function TryPut(var Obj: TSprayObject; Surface: PSDL_Surface): boolean; overload;
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const MaxPointsIndex = 8095;
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var x, y: Longword;
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    ar: array[0..MaxPointsIndex] of TPoint;
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    cnt, i: Longword;
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    r: TSDL_Rect;
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    Result: boolean;
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begin
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cnt:= 0;
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with Obj do
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     begin
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     if Maxcnt = 0 then
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        exit(false);
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     x:= 0;
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     r.x:= 0;
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     r.y:= 0;
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     r.w:= Width;
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     r.h:= Height + 16;
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     repeat
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         y:= 8;
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         repeat
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             if CheckLand(r, x, y - 8, $FFFFFF)
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                and not CheckIntersect(x, y, Width, Height) then
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                begin
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                ar[cnt].x:= x;
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                ar[cnt].y:= y;
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                inc(cnt);
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                if cnt > MaxPointsIndex then // buffer is full, do not check the rest land
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                   begin
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                   y:= 5000;
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                   x:= 5000;
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                   end
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   331
                end;
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             inc(y, 12);
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         until y > 1023 - Height - 8;
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         inc(x, getrandom(12) + 12)
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     until x > 2047 - Width;
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     Result:= cnt <> 0;
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     if Result then
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   338
        begin
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   339
        i:= getrandom(cnt);
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        r.x:= ar[i].X;
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        r.y:= ar[i].Y;
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        r.w:= Width;
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        r.h:= Height;
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        SDL_UpperBlit(Obj.Surf, nil, Surface, @r);
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        AddRect(ar[i].x - 32, ar[i].y - 32, Width + 64, Height + 64);
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        dec(Maxcnt)
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        end else Maxcnt:= 0
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     end;
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TryPut:= Result
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   350
end;
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procedure ReadThemeInfo(var ThemeObjects: TThemeObjects; var SprayObjects: TSprayObjects);
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var s: string;
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    f: textfile;
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    i, ii: LongInt;
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begin
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s:= Pathz[ptCurrTheme] + '/' + cThemeCFGFilename;
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WriteLnToConsole('Reading objects info...');
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Assign(f, s);
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{$I-}
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Reset(f);
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Readln(f, s); // skip color
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Readln(f, ThemeObjects.Count);
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for i:= 0 to Pred(ThemeObjects.Count) do
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    begin
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    Readln(f, s); // filename
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    with ThemeObjects.objs[i] do
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         begin
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         Surf:= LoadImage(Pathz[ptCurrTheme] + '/' + s, false, true, true);
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         Width:= Surf^.w;
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         Height:= Surf^.h;
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         with inland do Read(f, x, y, w, h);
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         Read(f, rectcnt);
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         for ii:= 1 to rectcnt do
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             with outland[ii] do Read(f, x, y, w, h);
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         Maxcnt:= 3;
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         ReadLn(f)
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         end;
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    end;
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Readln(f, SprayObjects.Count);
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for i:= 0 to Pred(SprayObjects.Count) do
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    begin
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    Readln(f, s); // filename
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    with SprayObjects.objs[i] do
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         begin
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         Surf:= LoadImage(Pathz[ptCurrTheme] + '/' + s, false, true, true);
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         Width:= Surf^.w;
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         Height:= Surf^.h;
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         ReadLn(f, Maxcnt)
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         end;
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    end;
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Close(f);
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{$I+}
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TryDo(IOResult = 0, 'Bad data or cannot access file ' + cThemeCFGFilename, true)
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end;
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procedure AddThemeObjects(Surface: PSDL_Surface; var ThemeObjects: TThemeObjects; MaxCount: LongInt);
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var i, ii, t: LongInt;
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    b: boolean;
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begin
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if ThemeObjects.Count = 0 then exit;
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WriteLnToConsole('Adding theme objects...');
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i:= 1;
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repeat
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    t:= getrandom(ThemeObjects.Count);
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    ii:= t;
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    repeat
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      inc(ii);
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      if ii = ThemeObjects.Count then ii:= 0;
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      b:= TryPut(ThemeObjects.objs[ii], Surface)
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    until b or (ii = t);
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    inc(i)
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until (i > MaxCount) or not b;
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end;
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procedure AddSprayObjects(Surface: PSDL_Surface; var SprayObjects: TSprayObjects; MaxCount: Longword);
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var i: Longword;
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    ii, t: LongInt;
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    b: boolean;
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begin
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if SprayObjects.Count = 0 then exit;
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WriteLnToConsole('Adding spray objects...');
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i:= 1;
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repeat
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    t:= getrandom(SprayObjects.Count);
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    ii:= t;
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    repeat
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      inc(ii);
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      if ii = SprayObjects.Count then ii:= 0;
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      b:= TryPut(SprayObjects.objs[ii], Surface)
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    until b or (ii = t);
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    inc(i)
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until (i > MaxCount) or not b;
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end;
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procedure AddObjects(InSurface, Surface: PSDL_Surface);
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var ThemeObjects: TThemeObjects;
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    SprayObjects: TSprayObjects;
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begin
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InitRects;
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AddGirder(256, Surface);
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AddGirder(512, Surface);
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AddGirder(768, Surface);
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AddGirder(1024, Surface);
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AddGirder(1280, Surface);
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AddGirder(1536, Surface);
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AddGirder(1792, Surface);
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ReadThemeInfo(ThemeObjects, SprayObjects);
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AddThemeObjects(Surface, ThemeObjects, 8);
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AddProgress;
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SDL_UpperBlit(InSurface, nil, Surface, nil);
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AddSprayObjects(Surface, SprayObjects, 10);
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FreeRects
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end;
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end.