1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
|
/* 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
|
