(*

 * Hedgewars, a free turn based strategy game

 * Copyright (c) 2004-2011 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

 *)

{$INCLUDE "options.inc"}

unit uLandPainted;

interface

procedure Draw;

procedure initModule;

procedure freeModule;

implementation

uses uLandGraphics, uConsts, uUtils, SDLh, uCommands, uDebug;

type PointRec = packed record

    X, Y: SmallInt;

    flags: byte;

    end;

type

    PPointEntry = ^PointEntry;

    PointEntry = record

        point: PointRec;

        next: PPointEntry;

        end;

var pointsListHead, pointsListLast: PPointEntry;

procedure DrawLineOnLand(X1, Y1, X2, Y2: LongInt);

var  eX, eY, dX, dY: LongInt;

    i, sX, sY, x, y, d: LongInt;

    b: boolean;

    len: LongWord;

begin

    len:= 0;

    if (X1 = X2) and (Y1 = Y2) then

        begin

        exit

        end;

    eX:= 0;

    eY:= 0;

    dX:= X2 - X1;

    dY:= Y2 - Y1;

    if (dX > 0) then

        sX:= 1

    else

        if (dX < 0) then

            begin

            sX:= -1;

            dX:= -dX

            end

        else

            sX:= dX;

    if (dY > 0) then

        sY:= 1

    else

        if (dY < 0) then

            begin

            sY:= -1;

            dY:= -dY

            end

        else

            sY:= dY;

        if (dX > dY) then

            d:= dX

        else

            d:= dY;

        x:= X1;

        y:= Y1;

        for i:= 0 to d do

            begin

            inc(eX, dX);

            inc(eY, dY);

            b:= false;

            if (eX > d) then

                begin

                dec(eX, d);

                inc(x, sX);

                b:= true

                end;

            if (eY > d) then

                begin

                dec(eY, d);

                inc(y, sY);

                b:= true

                end;

            if b then

                begin

                inc(len);

                if (len mod 4) = 0 then

                    FillRoundInLand(X, Y, 34, lfBasic)

                end

        end

end;

procedure chDraw(var s: shortstring);

var rec: PointRec;

    prec: ^PointRec;

    pe: PPointEntry;

    i, l: byte;

begin

    i:= 1;

    l:= length(s);

    while i < l do

        begin

        prec:= @s[i];

        rec:= prec^;

        rec.X:= SDLNet_Read16(@rec.X);

        rec.Y:= SDLNet_Read16(@rec.Y);

        pe:= new(PPointEntry);

        if pointsListLast = nil then

            pointsListHead:= pe

        else

            pointsListLast^.next:= pe;

        pointsListLast:= pe;

        pe^.point:= rec;

        pe^.next:= nil;

        inc(i, 5)

        end;

end;

procedure Draw;

var pe: PPointEntry;

    prevPoint: PointRec;

begin

    // shutup compiler

    prevPoint.X:= 0;

    prevPoint.Y:= 0;

    pe:= pointsListHead;

    TryDo((pe = nil) or (pe^.point.flags and $80 <> 0), 'Corrupted draw data', true);

    while(pe <> nil) do

        begin

        if (pe^.point.flags and $80 <> 0) then

            begin

            AddFileLog('[DRAW] Move to: ('+inttostr(pe^.point.X)+','+inttostr(pe^.point.Y)+')');

            FillRoundInLand(pe^.point.X, pe^.point.Y, 34, lfBasic)

            end

            else

            begin

            AddFileLog('[DRAW] Line to: ('+inttostr(pe^.point.X)+','+inttostr(pe^.point.Y)+')');

            DrawLineOnLand(prevPoint.X, prevPoint.Y, pe^.point.X, pe^.point.Y);

            end;

        prevPoint:= pe^.point;

        pe:= pe^.next;  

        end;

end;

procedure initModule;

begin

    pointsListHead:= nil;

    pointsListLast:= nil;

    RegisterVariable('draw', vtCommand, @chDraw, false);

end;

procedure freeModule;

var pe, pp: PPointEntry;

begin

    pe:= pointsListHead;

    while(pe <> nil) do

        begin

        pp:= pe;

        pe:= pe^.next;

        dispose(pp);

        end;

end;

end.