src/kml.cc

   1 /* kml.cc
   2  * Export from Aven as KML.
   3  */
   4 /* Copyright (C) 2012 Olaf Kähler
   5  * Copyright (C) 2012,2013,2014,2015,2016 Olly Betts
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
  20  */
  21
  22 #ifdef HAVE_CONFIG_H
  23 # include <config.h>
  24 #endif
  25
  26 #include "kml.h"
  27
  28 #include "export.h" // For LABELS, etc
  29
  30 #include <stdio.h>
  31 #include <string>
  32 #include <math.h>
  33
  34 #include "useful.h"
  35 #include <proj_api.h>
  36
  37 #include "aven.h"
  38 #include "message.h"
  39
  40 using namespace std;
  41
  42 #define WGS84_DATUM_STRING "+proj=longlat +ellps=WGS84 +datum=WGS84"
  43
  44 static void
  45 html_escape(FILE *fh, const char *s)
  46 {
  47     while (*s) {
  48         switch (*s) {
  49             case '<':
  50                 fputs("&lt;", fh);
  51                 break;
  52             case '>':
  53                 fputs("&gt;", fh);
  54                 break;
  55             case '&':
  56                 fputs("&amp;", fh);
  57                 break;
  58             default:
  59                 PUTC(*s, fh);
  60         }
  61         ++s;
  62     }
  63 }
  64
  65 KML::KML(const char * input_datum)
  66     : pj_input(NULL), pj_output(NULL), in_linestring(false)
  67 {
  68     if (!(pj_input = pj_init_plus(input_datum))) {
  69         wxString m = wmsg(/*Failed to initialise input coordinate system “%s”*/287);
  70         m = wxString::Format(m.c_str(), input_datum);
  71         throw m;
  72     }
  73     if (!(pj_output = pj_init_plus(WGS84_DATUM_STRING))) {
  74         wxString m = wmsg(/*Failed to initialise output coordinate system “%s”*/288);
  75         m = wxString::Format(m.c_str(), WGS84_DATUM_STRING);
  76         throw m;
  77     }
  78 }
  79
  80 KML::~KML()
  81 {
  82     if (pj_input)
  83         pj_free(pj_input);
  84     if (pj_output)
  85         pj_free(pj_output);
  86 }
  87
  88 const int *
  89 KML::passes() const
  90 {
  91     static const int default_passes[] = { LABELS|ENTS|FIXES|EXPORTS, LEGS|SURF, 0 };
  92     return default_passes;
  93 }
  94
  95 /* Initialise KML routines. */
  96 void KML::header(const char * title, const char *, time_t,
  97                  double, double, double, double, double, double)
  98 {
  99     fputs(
 100 "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n"
 101 "<kml xmlns=\"http://www.opengis.net/kml/2.2\">\n", fh);
 102     fputs("<Document><name>", fh);
 103     html_escape(fh, title);
 104     fputs("</name>\n", fh);
 105     // Set up styles for the icons to reduce the file size.
 106     fputs("<Style id=\"fix\"><IconStyle>"
 107           "<Icon><href>http://maps.google.com/mapfiles/kml/paddle/red-blank.png</href></Icon>"
 108           "</IconStyle></Style>\n", fh);
 109     fputs("<Style id=\"exp\"><IconStyle>"
 110           "<Icon><href>http://maps.google.com/mapfiles/kml/paddle/blu-blank.png</href></Icon>"
 111           "</IconStyle></Style>\n", fh);
 112     fputs("<Style id=\"ent\"><IconStyle>"
 113           "<Icon><href>http://maps.google.com/mapfiles/kml/paddle/grn-blank.png</href></Icon>"
 114           "</IconStyle></Style>\n", fh);
 115     // FIXME: does KML allow bounds?
 116     // NB Lat+long bounds are not necessarily the same as the bounds in survex
 117     // coords translated to WGS84 lat+long...
 118 }
 119
 120 void
 121 KML::line(const img_point *p1, const img_point *p, unsigned /*flags*/, bool fPendingMove)
 122 {
 123     if (fPendingMove) {
 124         if (!in_linestring) {
 125             in_linestring = true;
 126             fputs("<Placemark><MultiGeometry>\n", fh);
 127         } else {
 128             fputs("</coordinates></LineString>\n", fh);
 129         }
 130         fputs("<LineString><altitudeMode>absolute</altitudeMode><coordinates>\n", fh);
 131         double X = p1->x, Y = p1->y, Z = p1->z;
 132         pj_transform(pj_input, pj_output, 1, 1, &X, &Y, &Z);
 133         X = deg(X);
 134         Y = deg(Y);
 135         // %.8f is at worst just over 1mm.
 136         fprintf(fh, "%.8f,%.8f,%.2f\n", X, Y, Z);
 137     }
 138     double X = p->x, Y = p->y, Z = p->z;
 139     pj_transform(pj_input, pj_output, 1, 1, &X, &Y, &Z);
 140     X = deg(X);
 141     Y = deg(Y);
 142     // %.8f is at worst just over 1mm.
 143     fprintf(fh, "%.8f,%.8f,%.2f\n", X, Y, Z);
 144 }
 145
 146 void
 147 KML::label(const img_point *p, const char *s, bool /*fSurface*/, int type)
 148 {
 149     double X = p->x, Y = p->y, Z = p->z;
 150     pj_transform(pj_input, pj_output, 1, 1, &X, &Y, &Z);
 151     X = deg(X);
 152     Y = deg(Y);
 153     // %.8f is at worst just over 1mm.
 154     fprintf(fh, "<Placemark><Point><coordinates>%.8f,%.8f,%.2f</coordinates></Point><name>", X, Y, Z);
 155     html_escape(fh, s);
 156     fputs("</name>", fh);
 157     // Add a "pin" symbol with colour matching what aven shows.
 158     switch (type) {
 159         case FIXES:
 160             fputs("<styleUrl>#fix</styleUrl>", fh);
 161             break;
 162         case EXPORTS:
 163             fputs("<styleUrl>#exp</styleUrl>", fh);
 164             break;
 165         case ENTS:
 166             fputs("<styleUrl>#ent</styleUrl>", fh);
 167             break;
 168     }
 169     fputs("</Placemark>\n", fh);
 170 }
 171
 172 void
 173 KML::footer()
 174 {
 175     if (in_linestring)
 176         fputs("</coordinates></LineString></MultiGeometry></Placemark>\n", fh);
 177     fputs("</Document></kml>\n", fh);
 178 }