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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* 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; either version 2
* of the License, or (at your option) any later version.
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
/*
* This code is based on original Mortville Manor DOS source code
* Copyright (c) 1988-1989 Lankhor
*/
#include "mortevielle/droite.h"
#include "mortevielle/graphics.h"
#include "mortevielle/mortevielle.h"
#include "mortevielle/var_mor.h"
namespace Mortevielle {
void droite(int x, int y, int xx, int yy, int coul) {
int step, i;
float a, b;
float xr, yr, xro, yro;
xr = x;
yr = y;
xro = xx;
yro = yy;
if (abs(y - yy) > abs(x - xx)) {
a = (float)((x - xx)) / (y - yy);
b = (yr * xro - yro * xr) / (y - yy);
i = y;
if (y > yy) step = -1;
else step = 1;
do {
g_vm->_screenSurface.setPixel(Common::Point(abs((int)(a * i + b)), i), coul);
i = i + step;
} while (!(i == yy));
} else {
a = (float)((y - yy)) / (x - xx);
b = ((yro * xr) - (yr * xro)) / (x - xx);
i = x;
if (x > xx) step = -1;
else step = 1;
do {
g_vm->_screenSurface.setPixel(Common::Point(i, abs((int)(a * i + b))), coul);
i = i + step;
} while (!(i == xx));
}
}
} // End of namespace Mortevielle
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