File: overlap.c

package info (click to toggle)
ircmarkers 0.14-2
  • links: PTS, VCS
  • area: main
  • in suites: squeeze, wheezy
  • size: 160 kB
  • ctags: 69
  • sloc: perl: 704; ansic: 199; makefile: 71
file content (254 lines) | stat: -rw-r--r-- 6,983 bytes parent folder | download | duplicates (5)
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
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
/*
 * overlap.c is part of IrcMarkers
 *   Copyright (C) 2004, 2005, 2006 Christoph Berg <cb@df7cb.de>
 *
 *   2004-07-04: Modified to read from stdin
 *
 * Original copyright:
 *   MapMarkers, perl modules to create maps with markers.
 *   Copyright (C) 2002 Guillaume Leclanche (Mo-Ize) <mo-ize@nul-en.info>
 *
 * 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.
*/

#include <stdio.h>
#include <stdlib.h>
#include <assert.h>

#define min(x,y) (x < y ? x : y)
#define max(x,y) (x > y ? x : y)

enum align_e {
    RIGHT = 0,
    LEFT,
    ABOVE,
    BELOW,
    CENTER,
};

struct box {
    int left;
    int right;
    int top;
    int bottom;
    int width;
    int height;
};

struct marker {
    unsigned int id;
    unsigned int x;
    unsigned int y;
    int alignment;
    struct box dot;
    struct box txt;
#ifdef DEBUG
    int orig_txt_x;
    int orig_txt_y;
#endif
};

static int nb_markers;
static unsigned int image_width;
static unsigned int image_height;
static int offset;
static struct marker *markers;


static int
box_overlap(struct box *label, struct box *b)
{
    int width, height;

    if (label->left > b->right || label->right < b->left)
        return 0;
    if (label->top > b->bottom || label->bottom < b->top)
        return 0;

    if (label->left > b->left)
        width = min(b->right, label->right) - label->left;
    else
        width = min(b->right, label->right) - max(b->left, label->left);

    if (label->top > b->top)
        height = min(b->bottom, label->bottom) - label->top;
    else
        height = min(b->bottom, label->bottom) - max(b->top, label->top);

    return width * height;
}

static int
overlap(unsigned int id_current, struct box *b)
{
    int total_overlap = 0;
    int i;
    for (i = 0; i < nb_markers; i++) {
        if (i == id_current)
            continue;
        total_overlap += box_overlap(b, &(markers[i].txt));
        total_overlap += box_overlap(b, &(markers[i].dot));
    }
    return total_overlap;
}

static int
border_overlap(struct box *m)
{
    int ordinate_overhang, abscissa_overhang;

    ordinate_overhang = (image_width - m->right < 0 ? image_width - m->right : -min(0, m->left));
    abscissa_overhang = (image_height - m->bottom < 0 ? image_height - m->bottom : -min(0, m->top));
    return ordinate_overhang * m->width + abscissa_overhang * m->height
        + ordinate_overhang * abscissa_overhang;
}

void
align(struct box *b, struct marker *m, int a)
{
    switch (a) {
    case RIGHT:
        b->left = m->x + offset + m->dot.width/2;
        b->top  = m->y - m->txt.height/2;
        break;
    case LEFT:
        b->left = m->x - offset - m->txt.width - m->dot.width/2;
        b->top  = m->y - m->txt.height/2;
        break;
    case ABOVE:
        b->left = m->x - m->txt.width/2;
        b->top  = m->y - offset - m->txt.height - m->dot.height/2;
        break;
    case BELOW:
        b->left = m->x - m->txt.width/2;
        b->top  = m->y + offset + m->dot.height/2;
        break;
    case CENTER:
        b->left = m->x - m->txt.width/2;
        b->top  = m->y - m->txt.height/2;
        break;
    default:
        assert(0);
    }

    b->width = m->txt.width;
    b->height = m->txt.height;

    b->right = b->left + b->width;
    b->bottom = b->top + b->height;
}

static void
correctOverlap(void)
{
    /* initialize each individual Marker's bounding box */
    int i;
    for (i = 0; i < nb_markers; i++)
    {
        struct box b[5];
        int max_overlap = 0, a = 0;
#if DEBUG
        fprintf(stderr, "Marker %d: %d\n", i, markers[i].dot.height);
#endif

        for (a = 0; a <= 4; a++)
        {
            align(b+a, markers+i, a);
            int total_overlap = border_overlap(b+a) + overlap(i, b+a);
#if DEBUG
            fprintf(stderr, "\tTry alignment %d: Overlap = %d %d %d\n", a, total_overlap, b[a].left, b[a].bottom);
#endif
            if (a == 0 || total_overlap < max_overlap) {
                markers[i].alignment = a;
                max_overlap = total_overlap;
            }
            if (total_overlap == 0)
                break;
        }

        markers[i].txt = b[markers[i].alignment];
    }
}

int
main(int argc, char* argv[])
{
    int i = 0;
    int alloc_markers = 4;

    /* invalid number of args */
    if (argc != 4)
    {
        fprintf(stderr, "invalid number of args\n");
        return(1);
    }

    nb_markers = 0;
    image_width = atoi(argv[1]);
    image_height = atoi(argv[2]);
    offset = atoi(argv[3]);
    markers = malloc( alloc_markers * sizeof(struct marker) );
    assert(markers);

    /* Read the data and store them into the struct table */
    for (nb_markers = 0; !feof(stdin); nb_markers++) {
        if(nb_markers >= alloc_markers) {
            void *nm;
            alloc_markers <<= 2;
            nm = realloc(markers, alloc_markers * sizeof(struct marker));
            assert(nm);
            markers = nm;
        }
        i = scanf("%u\t%u\t%u\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\n",
                &(markers[nb_markers].id),
                &(markers[nb_markers].x),
                &(markers[nb_markers].y),
                &(markers[nb_markers].dot.left),
                &(markers[nb_markers].dot.right),
                &(markers[nb_markers].dot.top),
                &(markers[nb_markers].dot.bottom),
                &(markers[nb_markers].dot.width),
                &(markers[nb_markers].dot.height),
                &(markers[nb_markers].txt.left),
                &(markers[nb_markers].txt.right),
                &(markers[nb_markers].txt.top),
                &(markers[nb_markers].txt.bottom),
                &(markers[nb_markers].txt.width),
                &(markers[nb_markers].txt.height));
        if (i == -1) continue;
        if (i != 15) assert(0);
#ifdef DEBUG
        markers[nb_markers].orig_txt_x = markers[nb_markers].txt.left;
        markers[nb_markers].orig_txt_y = markers[nb_markers].txt.bottom;
#endif
    }

    correctOverlap();

    /* Now write the resulting data to stdout */
    for (i = 0; i < nb_markers; i++) {
        printf("%u\t%+d\t%+d\n",
                    markers[i].id,
                    markers[i].txt.left,
                    markers[i].txt.bottom);
#if DEBUG
        fprintf(stderr, "label %d moved %+d %+d (alignment %d)\n", i,
                markers[i].orig_txt_x - markers[i].txt.left,
                markers[i].orig_txt_y - markers[i].txt.bottom,
                markers[i].alignment);
#endif
    }

    return 0; /* give back control to perl */
}

/* vim:sw=4:et
 */