mirror of
https://github.com/libretro/scummvm.git
synced 2024-12-18 07:39:08 +00:00
69 lines
2.0 KiB
C++
69 lines
2.0 KiB
C++
/* 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/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;
|
|
/*writeln(le_file,'(',x:4,',',y:4,') ==> (',xx:4,',',yy:4,')');*/
|
|
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 {
|
|
putpix(gd, abs((int)(a * i + b)), i, coul);
|
|
i = i + step;
|
|
} while (!(i == yy));
|
|
/*writeln(le_file,'X == ',a:3:3,' * Y + ',b:3:3);*/
|
|
} 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 {
|
|
putpix(gd, i, abs((int)(a * i + b)), coul);
|
|
i = i + step;
|
|
} while (!(i == xx));
|
|
/*writeln(le_file,'Y == ',a:3:3,' * X + ',b:3:3);*/
|
|
}
|
|
}
|
|
|
|
} // End of namespace Mortevielle
|