1 | /* gpx.cc |
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2 | * Export from Aven as GPX. |
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3 | */ |
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4 | /* Copyright (C) 2012 Olaf Kähler |
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5 | * Copyright (C) 2012,2013,2014,2015,2016 Olly Betts |
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6 | * |
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7 | * This program is free software; you can redistribute it and/or modify |
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8 | * it under the terms of the GNU General Public License as published by |
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9 | * the Free Software Foundation; either version 2 of the License, or |
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10 | * (at your option) any later version. |
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11 | * |
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12 | * This program is distributed in the hope that it will be useful, |
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13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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15 | * GNU General Public License for more details. |
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16 | * |
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17 | * You should have received a copy of the GNU General Public License |
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18 | * along with this program; if not, write to the Free Software |
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19 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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20 | */ |
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21 | |
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22 | #include <config.h> |
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23 | |
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24 | #include "gpx.h" |
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25 | |
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26 | #include "export.h" // For LABELS, etc |
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27 | |
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28 | #include <stdio.h> |
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29 | #include <string> |
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30 | #include <time.h> |
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31 | #include <math.h> |
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32 | |
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33 | #include "useful.h" |
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34 | #include <proj.h> |
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35 | |
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36 | #include "aven.h" |
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37 | #include "message.h" |
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38 | |
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39 | using namespace std; |
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40 | |
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41 | #define WGS84_DATUM_STRING "EPSG:4326" |
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42 | |
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43 | static void |
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44 | html_escape(FILE *fh, const char *s) |
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45 | { |
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46 | while (*s) { |
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47 | switch (*s) { |
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48 | case '<': |
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49 | fputs("<", fh); |
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50 | break; |
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51 | case '>': |
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52 | fputs(">", fh); |
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53 | break; |
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54 | case '&': |
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55 | fputs("&", fh); |
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56 | break; |
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57 | default: |
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58 | PUTC(*s, fh); |
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59 | } |
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60 | ++s; |
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61 | } |
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62 | } |
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63 | |
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64 | static void discarding_proj_logger(void *, int, const char *) { } |
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65 | |
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66 | GPX::GPX(const char * input_datum) |
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67 | { |
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68 | /* Prevent stderr spew from PROJ. */ |
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69 | proj_log_func(PJ_DEFAULT_CTX, nullptr, discarding_proj_logger); |
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70 | |
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71 | pj = proj_create_crs_to_crs(PJ_DEFAULT_CTX, |
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72 | input_datum, WGS84_DATUM_STRING, |
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73 | NULL); |
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74 | |
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75 | if (pj) { |
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76 | // Normalise the output order so x is longitude and y latitude - by |
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77 | // default new PROJ has them switched for EPSG:4326 which just seems |
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78 | // confusing. |
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79 | PJ* pj_norm = proj_normalize_for_visualization(PJ_DEFAULT_CTX, pj); |
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80 | proj_destroy(pj); |
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81 | pj = pj_norm; |
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82 | } |
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83 | |
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84 | if (!pj) { |
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85 | wxString m = wmsg(/*Failed to initialise input coordinate system “%s”*/287); |
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86 | m = wxString::Format(m.c_str(), input_datum); |
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87 | throw m; |
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88 | } |
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89 | } |
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90 | |
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91 | GPX::~GPX() |
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92 | { |
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93 | if (pj) |
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94 | proj_destroy(pj); |
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95 | free((void*)trk_name); |
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96 | } |
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97 | |
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98 | const int * |
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99 | GPX::passes() const |
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100 | { |
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101 | static const int default_passes[] = { LABELS|ENTS|FIXES|EXPORTS, LEGS|SURF, 0 }; |
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102 | return default_passes; |
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103 | } |
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104 | |
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105 | /* Initialise GPX routines. */ |
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106 | void GPX::header(const char * title, const char *, time_t datestamp_numeric, |
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107 | double, double, double, double, double, double) |
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108 | { |
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109 | fputs( |
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110 | "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n" |
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111 | "<gpx version=\"1.0\" creator=\"" PACKAGE_STRING " (aven) - https://survex.com/\"" |
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112 | " xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\"" |
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113 | " xmlns=\"http://www.topografix.com/GPX/1/0\"" |
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114 | " xsi:schemaLocation=\"http://www.topografix.com/GPX/1/0" |
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115 | " http://www.topografix.com/GPX/1/0/gpx.xsd\">\n", fh); |
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116 | if (title) { |
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117 | fputs("<name>", fh); |
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118 | html_escape(fh, title); |
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119 | fputs("</name>\n", fh); |
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120 | trk_name = strdup(title); |
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121 | } |
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122 | if (datestamp_numeric != time_t(-1)) { |
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123 | struct tm * tm = gmtime(&datestamp_numeric); |
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124 | if (tm) { |
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125 | char buf[32]; |
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126 | if (strftime(buf, sizeof(buf), "%Y-%m-%dT%H:%M:%SZ", tm)) { |
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127 | fputs("<time>", fh); |
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128 | fputs(buf, fh); |
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129 | fputs("</time>\n", fh); |
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130 | } |
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131 | } |
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132 | } |
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133 | // FIXME: optional in GPX, but perhaps useful: |
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134 | // <bounds minlat="..." minlon="..." maxlat="..." maxlon="..." /> |
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135 | // NB Not necessarily the same as the bounds in survex coords translated |
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136 | // to WGS84 lat+long... |
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137 | } |
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138 | |
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139 | void |
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140 | GPX::line(const img_point *p1, const img_point *p, unsigned /*flags*/, bool fPendingMove) |
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141 | { |
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142 | if (fPendingMove) { |
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143 | if (in_trkseg) { |
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144 | fputs("</trkseg><trkseg>\n", fh); |
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145 | } else { |
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146 | fputs("<trk>", fh); |
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147 | if (trk_name) { |
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148 | fputs("<name>", fh); |
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149 | html_escape(fh, trk_name); |
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150 | fputs("</name>", fh); |
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151 | } |
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152 | fputs("<trkseg>\n", fh); |
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153 | in_trkseg = true; |
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154 | } |
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155 | PJ_COORD coord{{p1->x, p1->y, p1->z, HUGE_VAL}}; |
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156 | coord = proj_trans(pj, PJ_FWD, coord); |
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157 | if (coord.xyzt.x == HUGE_VAL || |
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158 | coord.xyzt.y == HUGE_VAL || |
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159 | coord.xyzt.z == HUGE_VAL) { |
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160 | // FIXME report errors |
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161 | } |
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162 | // %.8f is at worst just over 1mm. |
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163 | fprintf(fh, "<trkpt lon=\"%.8f\" lat=\"%.8f\"><ele>%.2f</ele></trkpt>\n", |
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164 | coord.xyzt.x, |
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165 | coord.xyzt.y, |
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166 | coord.xyzt.z); |
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167 | } |
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168 | |
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169 | PJ_COORD coord{{p->x, p->y, p->z, HUGE_VAL}}; |
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170 | coord = proj_trans(pj, PJ_FWD, coord); |
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171 | if (coord.xyzt.x == HUGE_VAL || |
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172 | coord.xyzt.y == HUGE_VAL || |
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173 | coord.xyzt.z == HUGE_VAL) { |
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174 | // FIXME report errors |
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175 | } |
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176 | // %.8f is at worst just over 1mm. |
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177 | fprintf(fh, "<trkpt lon=\"%.8f\" lat=\"%.8f\"><ele>%.2f</ele></trkpt>\n", |
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178 | coord.xyzt.x, |
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179 | coord.xyzt.y, |
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180 | coord.xyzt.z); |
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181 | } |
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182 | |
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183 | void |
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184 | GPX::label(const img_point *p, const wxString& str, bool /*fSurface*/, int type) |
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185 | { |
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186 | const char* s = str.utf8_str(); |
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187 | PJ_COORD coord{{p->x, p->y, p->z, HUGE_VAL}}; |
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188 | coord = proj_trans(pj, PJ_FWD, coord); |
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189 | if (coord.xyzt.x == HUGE_VAL || |
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190 | coord.xyzt.y == HUGE_VAL || |
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191 | coord.xyzt.z == HUGE_VAL) { |
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192 | // FIXME report errors |
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193 | } |
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194 | // %.8f is at worst just over 1mm. |
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195 | fprintf(fh, "<wpt lon=\"%.8f\" lat=\"%.8f\"><ele>%.2f</ele><name>", |
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196 | coord.xyzt.x, |
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197 | coord.xyzt.y, |
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198 | coord.xyzt.z); |
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199 | html_escape(fh, s); |
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200 | fputs("</name>", fh); |
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201 | // Add a "pin" symbol with colour matching what aven shows. |
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202 | switch (type) { |
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203 | case FIXES: |
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204 | fputs("<sym>Pin, Red</sym>", fh); |
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205 | break; |
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206 | case EXPORTS: |
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207 | fputs("<sym>Pin, Blue</sym>", fh); |
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208 | break; |
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209 | case ENTS: |
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210 | fputs("<sym>Pin, Green</sym>", fh); |
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211 | break; |
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212 | } |
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213 | fputs("</wpt>\n", fh); |
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214 | } |
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215 | |
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216 | void |
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217 | GPX::footer() |
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218 | { |
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219 | if (in_trkseg) |
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220 | fputs("</trkseg></trk>\n", fh); |
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221 | fputs("</gpx>\n", fh); |
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222 | } |
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