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
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
|
/* gcompris - nice_target_spot.cpp
*
* Copyright (C) 2006 Olaf Ronneberger
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/**************************************************************************
** Title: create nice target spot
**
** create nice target spots for puzzle pieces in gcpomris shapegame
** based on distance transform from Pedro F. Felzenszwalb and
** Daniel P. Huttenlocher.
**
**************************************************************************/
#include <cstdio>
#include <cstdlib>
#include <cmath>
#include "dt/pnmfile.h"
#include "dt/imconv.h"
#include "dt/dt.h"
int main(int argc, char **argv) {
if (argc != 3) {
fprintf(stderr, "usage: %s input(pbm) output(ppm)\n", argv[0]);
return 1;
}
char *input_name = argv[1];
char *output_name = argv[2];
// load input
image<uchar> *input = loadPBM(input_name);
// compute dt
image<float> *out = dt(input);
// take square roots
for (int y = 0; y < out->height(); y++) {
for (int x = 0; x < out->width(); x++) {
imRef(out, x, y) = sqrt(imRef(out, x, y));
}
}
// find maximum
int xmax = 0;
int ymax = 0;
float maxValue = 0;
for (int y = 0; y < out->height(); y++) {
for (int x = 0; x < out->width(); x++) {
if( imRef(out, x, y) > maxValue)
{
xmax = x;
ymax = y;
maxValue = imRef(out, x, y);
}
}
}
// draw circle at max position into new image (not touching the border)
image<rgb>* circleimage = new image<rgb>( input->width(),
input->height(), false);
rgb white;
white.r = 255;
white.g = 255;
white.b = 255;
circleimage->init(white);
float circleRadius = 3.5;
float borderThickness = 1;
float innerCircleSqrRadius = square(circleRadius);
float outerCircleSqrRadius = square(circleRadius+borderThickness);
rgb dotColor;
dotColor.r = 255;
dotColor.g = 0;
dotColor.b = 0;
rgb borderColor;
borderColor.r = 0;
borderColor.g = 0;
borderColor.b = 0;
for (int y = 0; y < out->height(); y++) {
for (int x = 0; x < out->width(); x++) {
float currentSqrRadius = square(x - xmax) + square(y - ymax);
if( currentSqrRadius <= outerCircleSqrRadius
&& imRef(out, x, y) > 1)
{
if( currentSqrRadius <= innerCircleSqrRadius)
{
imRef( circleimage, x, y) = dotColor;
}
else
{
imRef( circleimage, x, y) = borderColor;
}
}
}
}
// save output
savePPM(circleimage, output_name);
delete input;
delete out;
delete circleimage;
}
|
