summaryrefslogtreecommitdiff
path: root/navit/coord.c
blob: bb16978c89b3d6b89a99a0a0cd43e850b9f88d02 (plain)
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
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
/**
 * Navit, a modular navigation system.
 * Copyright (C) 2005-2008 Navit Team
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 as published by the Free Software Foundation.
 *
 * 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.
 */

#include <stdlib.h>
#include <glib.h>
#include <stdio.h>
#include <string.h>
#include <math.h>
#include "debug.h"
#include "item.h"
#include "coord.h"
#include "transform.h"
#include "projection.h"
/**
 * @defgroup coord Coordinate handling functions
 * @{
 */

/**
 * Get a coordinate
 *
 * @param p Pointer to the coordinate
 * @returns the coordinate
 */

struct coord * coord_get(unsigned char **p) {
    struct coord *ret=(struct coord *)(*p);
    *p += sizeof(*ret);
    return ret;
}

struct coord * coord_new(int x, int y) {
    struct coord *c=g_new(struct coord, 1);

    c->x=x;
    c->y=y;

    return c;
}

struct coord * coord_new_from_attrs(struct attr *parent, struct attr **attrs) {
    struct attr *x,*y;
    x=attr_search(attrs, NULL, attr_x);
    y=attr_search(attrs, NULL, attr_y);
    if (!x || !y)
        return NULL;
    return coord_new(x->u.num, y->u.num);
}


void coord_destroy(struct coord *c) {
    g_free(c);
}

struct coord_rect * coord_rect_new(struct coord *lu, struct coord *rl) {
    struct coord_rect *r=g_new(struct coord_rect, 1);

    dbg_assert(lu->x <= rl->x);
    dbg_assert(lu->y >= rl->y);

    r->lu=*lu;
    r->rl=*rl;

    return r;

}

void coord_rect_destroy(struct coord_rect *r) {
    g_free(r);
}

int coord_rect_overlap(struct coord_rect *r1, struct coord_rect *r2) {
    dbg_assert(r1->lu.x <= r1->rl.x);
    dbg_assert(r1->lu.y >= r1->rl.y);
    dbg_assert(r2->lu.x <= r2->rl.x);
    dbg_assert(r2->lu.y >= r2->rl.y);
    dbg(lvl_debug,"0x%x,0x%x - 0x%x,0x%x vs 0x%x,0x%x - 0x%x,0x%x", r1->lu.x, r1->lu.y, r1->rl.x, r1->rl.y, r2->lu.x,
        r2->lu.y, r2->rl.x, r2->rl.y);
    if (r1->lu.x > r2->rl.x)
        return 0;
    if (r1->rl.x < r2->lu.x)
        return 0;
    if (r1->lu.y < r2->rl.y)
        return 0;
    if (r1->rl.y > r2->lu.y)
        return 0;
    return 1;
}

int coord_rect_contains(struct coord_rect *r, struct coord *c) {
    dbg_assert(r->lu.x <= r->rl.x);
    dbg_assert(r->lu.y >= r->rl.y);
    if (c->x < r->lu.x)
        return 0;
    if (c->x > r->rl.x)
        return 0;
    if (c->y < r->rl.y)
        return 0;
    if (c->y > r->lu.y)
        return 0;
    return 1;
}

void coord_rect_extend(struct coord_rect *r, struct coord *c) {
    if (c->x < r->lu.x)
        r->lu.x=c->x;
    if (c->x > r->rl.x)
        r->rl.x=c->x;
    if (c->y < r->rl.y)
        r->rl.y=c->y;
    if (c->y > r->lu.y)
        r->lu.y=c->y;
}

/**
 * Parses \c char \a *coord_input and writes back the coordinates to \c coord \a *result, using \c projection \a output_projection.
 * \a *coord_input may specify its projection at the beginning.
 * The format for \a *coord_input can be:
 * 	\li [Proj:][-]0xXX.... [-]0xXX... - Mercator coordinates, hex integers (XX), Proj can be "mg" or "garmin", defaults to mg
 * 	\li [Proj:][D][D]Dmm.mm.. N/S [D][D]DMM.mm... E/W - lat/long (WGS 84), integer degrees (DD) and minutes as decimal fraction (MM), Proj must be "geo" or absent
 * 	\li [Proj:][-][D]D.d[d]... [-][D][D]D.d[d] - long/lat (WGS 84, note order!), degrees as decimal fraction, Proj does not matter
 * 	\li utm[zoneinfo]:[-][D]D.d[d]... [-][D][D]D.d[d] - UTM coordinates, as decimal fraction, with optional zone information (?)
 * Note that the spaces are relevant for parsing.
 *
 * @param *coord_input String to be parsed
 * @param output_projection Desired projection of the result
 * @param *result For returning result
 * @returns The lenght of the parsed string
 */

int coord_parse(const char *coord_input, enum projection output_projection, struct coord *result) {
    char *proj=NULL,*s,*co;
    const char *str=coord_input;
    int args,ret = 0;
    struct coord_geo g;
    struct coord c,offset;
    enum projection str_pro=projection_none;

    dbg(lvl_debug,"enter('%s',%d,%p)", coord_input, output_projection, result);
    s=strchr(str,' ');
    co=strchr(str,':');
    if (co && co < s) {
        proj=g_malloc(co-str+1);
        g_strlcpy(proj, str, 1+co-str);
        dbg(lvl_debug,"projection=%s", proj);
        str=co+1;
        s=strchr(str,' ');
        if (!strcmp(proj, "geo"))
            str_pro = projection_none;
        else {
            str_pro = projection_from_name(proj,&offset);
            if (str_pro == projection_none) {
                dbg(lvl_error, "Unknown projection: %s", proj);
                goto out;
            }
        }
    }
    if (! s) {
        ret=0;
        goto out;
    }
    while (*s == ' ') {
        s++;
    }
    if (!strncmp(s, "0x", 2) || !strncmp(s, "-0x", 3)) {
        args=sscanf(str, "%i %i%n",&c.x, &c.y, &ret);
        if (args < 2)
            goto out;
        dbg(lvl_debug,"str='%s' x=0x%x y=0x%x c=%d", str, c.x, c.y, ret);
        dbg(lvl_debug,"rest='%s'", str+ret);

        if (str_pro == projection_none)
            str_pro=projection_mg;
        if (str_pro != output_projection) {
            transform_to_geo(str_pro, &c, &g);
            transform_from_geo(output_projection, &g, &c);
        }
        *result=c;
    } else if (*s == 'N' || *s == 'n' || *s == 'S' || *s == 's') {
        double lng, lat;
        char ns, ew;
        dbg(lvl_debug,"str='%s'", str);
        args=sscanf(str, "%lf %c %lf %c%n", &lat, &ns, &lng, &ew, &ret);
        dbg(lvl_debug,"args=%d", args);
        dbg(lvl_debug,"lat=%f %c lon=%f %c", lat, ns, lng, ew);
        if (args < 4)
            goto out;
        dbg(lvl_debug,"projection=%d str_pro=%d projection_none=%d", output_projection, str_pro, projection_none);
        if (str_pro == projection_none) {
            g.lat=floor(lat/100);
            lat-=g.lat*100;
            g.lat+=lat/60;
            g.lng=floor(lng/100);
            lng-=g.lng*100;
            g.lng+=lng/60;
            if (ns == 's' || ns == 'S')
                g.lat=-g.lat;
            if (ew == 'w' || ew == 'W')
                g.lng=-g.lng;
            dbg(lvl_debug,"transform_from_geo(%f,%f)",g.lat,g.lng);
            transform_from_geo(output_projection, &g, result);
            dbg(lvl_debug,"result 0x%x,0x%x", result->x,result->y);
        }
        dbg(lvl_debug,"str='%s' x=%f ns=%c y=%f ew=%c c=%d", str, lng, ns, lat, ew, ret);
        dbg(lvl_debug,"rest='%s'", str+ret);
    } else if (str_pro == projection_utm) {
        double x,y;
        args=sscanf(str, "%lf %lf%n", &x, &y, &ret);
        if (args < 2)
            goto out;
        c.x=x+offset.x;
        c.y=y+offset.y;
        if (str_pro != output_projection) {
            transform_to_geo(str_pro, &c, &g);
            transform_from_geo(output_projection, &g, &c);
        }
        *result=c;
    } else {
        double lng, lat;
        args=sscanf(str, "%lf %lf%n", &lng, &lat, &ret);
        if (args < 2)
            goto out;
        dbg(lvl_debug,"str='%s' x=%f y=%f  c=%d", str, lng, lat, ret);
        dbg(lvl_debug,"rest='%s'", str+ret);
        g.lng=lng;
        g.lat=lat;
        transform_from_geo(output_projection, &g, result);
    }
    ret+=str-coord_input;
    dbg(lvl_info, "ret=%d delta=%d ret_str='%s'", ret, GPOINTER_TO_INT(str-coord_input), coord_input+ret);
out:
    g_free(proj);
    return ret;
}

/**
 * A wrapper for coord_parse that also returns the projection.
 * For parameters see coord_parse.
 */

int pcoord_parse(const char *c_str, enum projection pro, struct pcoord *pc_ret) {
    struct coord c;
    int ret;
    ret = coord_parse(c_str, pro, &c);
    pc_ret->x = c.x;
    pc_ret->y = c.y;
    pc_ret->pro = pro;
    return ret;
}

void coord_print(enum projection pro, struct coord *c, FILE *out) {
    unsigned int x;
    unsigned int y;
    char *sign_x = "";
    char *sign_y = "";

    if ( c->x < 0 ) {
        x = -c->x;
        sign_x = "-";
    } else {
        x = c->x;
    }
    if ( c->y < 0 ) {
        y = -c->y;
        sign_y = "-";
    } else {
        y = c->y;
    }
    fprintf( out, "%s: %s0x%x %s0x%x\n",
             projection_to_name( pro ),
             sign_x, x,
             sign_y, y );
    return;
}

/**
 * @brief Converts a lat/lon into a text formatted text string.
 * @param lat The latitude (if lat is 360 or greater, the latitude will be omitted)
 * @param lng The longitude (if lng is 360 or greater, the longitude will be omitted)
 * @param fmt The format to use.
 *    @li DEGREES_DECIMAL=>Degrees with decimal places, i.e. 20.5000°N 110.5000°E
 *    @li DEGREES_MINUTES=>Degrees and minutes, i.e. 20°30.00'N 110°30.00'E
 *    @li DEGREES_MINUTES_SECONDS=>Degrees, minutes and seconds, i.e. 20°30'30.00"N 110°30'30"E
 *
 *
 * @param buffer  A buffer large enough to hold the output + a terminating NULL (up to 31 bytes)
 * @param size The size of the buffer
 *
 */
void coord_format(float lat,float lng, enum coord_format fmt, char * buffer, int size) {

    char lat_c='N';
    char lng_c='E';
    float lat_deg,lat_min,lat_sec;
    float lng_deg,lng_min,lng_sec;
    int size_used=0;

    if (lng < 0) {
        lng=-lng;
        lng_c='W';
    }
    if (lat < 0) {
        lat=-lat;
        lat_c='S';
    }
    lat_deg=lat;
    lat_min=(lat-floor(lat_deg))*60;
    lat_sec=fmod(lat*3600,60);
    lng_deg=lng;
    lng_min=(lng-floor(lng_deg))*60;
    lng_sec=fmod(lng*3600,60);
    switch(fmt) {

    case DEGREES_DECIMAL:
        if (lat<360)
            size_used+=g_snprintf(buffer+size_used,size-size_used,"%02.6f°%c",lat,lat_c);
        if ((lat<360)&&(lng<360))
            size_used+=g_snprintf(buffer+size_used,size-size_used," ");
        if (lng<360)
            size_used+=g_snprintf(buffer+size_used,size-size_used,"%03.7f°%c",lng,lng_c);
        break;
    case DEGREES_MINUTES:
        if (lat<360)
            size_used+=g_snprintf(buffer+size_used,size-size_used,"%02.0f°%07.4f' %c",floor(lat_deg),lat_min,lat_c);
        if ((lat<360)&&(lng<360))
            size_used+=g_snprintf(buffer+size_used,size-size_used," ");
        if (lng<360)
            size_used+=g_snprintf(buffer+size_used,size-size_used,"%03.0f°%07.4f' %c",floor(lng_deg),lng_min,lng_c);
        break;
    case DEGREES_MINUTES_SECONDS:
        if (lat<360)
            size_used+=g_snprintf(buffer+size_used,size-size_used,"%02.0f°%02.0f'%05.2f\" %c",floor(lat_deg),floor(lat_min),
                                  lat_sec,lat_c);
        if ((lat<360)&&(lng<360))
            size_used+=g_snprintf(buffer+size_used,size-size_used," ");
        if (lng<360)
            size_used+=g_snprintf(buffer+size_used,size-size_used,"%03.0f°%02.0f'%05.2f\" %c",floor(lng_deg),floor(lng_min),
                                  lng_sec,lng_c);
        break;


    }

}

unsigned int coord_hash(const void *key) {
    const struct coord *c=key;
    return c->x^c->y;
}

int coord_equal(const void *a, const void *b) {
    const struct coord *c_a=a;
    const struct coord *c_b=b;
    if (c_a->x == c_b->x && c_a->y == c_b->y)
        return TRUE;
    return FALSE;
}
/** @} */