(*
 * Hedgewars, a free turn based strategy game
 * Copyright (c) 2010 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 LoadFromFile(fileName: shortstring);

implementation
uses uLandGraphics, uConsts, uUtils, SDLh;

type PointRec = packed record
    X, Y: SmallInt;
    flags: byte;
    end;

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 LoadFromFile(fileName: shortstring);
var
    f: file of PointRec;
    rec, prevRec: PointRec;
begin
    fileMode:= 0;

    assignFile(f, fileName);
    reset(f);

    while not eof(f) do
        begin
        read(f, rec);
        rec.X:= SDLNet_Read16(@rec.X);
        rec.Y:= SDLNet_Read16(@rec.Y);

        // FIXME: handle single point
        if eof(f) or (rec.flags and $80 <> 0) then
            else
            DrawLineOnLand(prevRec.X, prevRec.Y, rec.X, rec.Y);

        prevRec:= rec;
        end;

    closeFile(f);
end;

end.