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 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 | #ifdef HAVE_CONFIG_H |
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23 | # include <config.h> |
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24 | #endif |
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25 | |
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26 | /* We us the PROJ.4 library to transform coordinates from almost arbitrary |
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27 | * grids into WGS84. The output is then written as a GPX file ready for use in |
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28 | * your favourite GPS software. |
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29 | * |
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30 | * Example for data given in BMN M31 (Totes Gebirge, Austria): |
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31 | * +proj=tmerc +lat_0=0 +lon_0=13d20 +k=1 +x_0=0 +y_0=-5200000 +ellps=bessel +towgs84=577.326,90.129,463.919,5.137,1.474,5.297,2.4232 |
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32 | * |
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33 | * Example for data given in british grid SD (Yorkshire): |
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34 | * +proj=tmerc +lat_0=49d +lon_0=-2d +k=0.999601 +x_0=100000 +y_0=-500000 +ellps=airy +towgs84=375,-111,431,0,0,0,0 |
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35 | * |
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36 | * Example for data given as proper british grid reference: |
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37 | * +proj=tmerc +lat_0=49d +lon_0=-2d +k=0.999601 +x_0=400000 +y_0=-100000 +ellps=airy +towgs84=375,-111,431,0,0,0,0 |
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38 | */ |
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39 | |
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40 | #include "gpx.h" |
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41 | |
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42 | #include "export.h" // For LABELS, etc |
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43 | |
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44 | #include <stdio.h> |
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45 | #include <string> |
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46 | #include <math.h> |
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47 | |
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48 | #include "useful.h" |
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49 | #include <proj_api.h> |
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50 | |
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51 | #include "aven.h" |
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52 | #include "message.h" |
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53 | |
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54 | using namespace std; |
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55 | |
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56 | #define WGS84_DATUM_STRING "+proj=longlat +ellps=WGS84 +datum=WGS84" |
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57 | |
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58 | // {HLP_ENCODELONG(0), /*input datum as string to pass to PROJ*/389, 0}, |
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59 | |
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60 | // cmdline_set_syntax_message(/*-d PROJ_DATUM 3D_FILE*/388, 0, NULL); |
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61 | static const char * input_datum = "+proj=tmerc +lat_0=0 +lon_0=13d20 +k=1 +x_0=0 +y_0=-5200000 +ellps=bessel +towgs84=577.326,90.129,463.919,5.137,1.474,5.297,2.4232"; |
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62 | |
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63 | static void |
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64 | html_escape(FILE *fh, const char *s) |
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65 | { |
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66 | while (*s) { |
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67 | switch (*s) { |
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68 | case '<': |
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69 | fputs("<", fh); |
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70 | break; |
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71 | case '>': |
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72 | fputs(">", fh); |
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73 | break; |
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74 | case '&': |
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75 | fputs("&", fh); |
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76 | break; |
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77 | default: |
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78 | PUTC(*s, fh); |
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79 | } |
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80 | ++s; |
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81 | } |
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82 | } |
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83 | |
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84 | GPX::GPX() |
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85 | : pj_input(NULL), pj_output(NULL), in_trkseg(false) |
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86 | { |
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87 | if (!(pj_input = pj_init_plus(input_datum))) { |
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88 | wxString m = wmsg(/*Failed to initialise input coordinate system “%s”*/287); |
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89 | m = wxString::Format(m.c_str(), input_datum); |
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90 | wxGetApp().ReportError(m); |
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91 | return; |
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92 | } |
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93 | if (!(pj_output = pj_init_plus(WGS84_DATUM_STRING))) { |
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94 | wxString m = wmsg(/*Failed to initialise output coordinate system “%s”*/288); |
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95 | m = wxString::Format(m.c_str(), WGS84_DATUM_STRING); |
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96 | wxGetApp().ReportError(m); |
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97 | return; |
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98 | } |
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99 | } |
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100 | |
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101 | GPX::~GPX() |
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102 | { |
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103 | if (pj_input) |
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104 | pj_free(pj_input); |
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105 | if (pj_output) |
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106 | pj_free(pj_output); |
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107 | } |
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108 | |
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109 | const int * |
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110 | GPX::passes() const |
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111 | { |
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112 | static const int default_passes[] = { LABELS|ENTS|FIXES|EXPORTS, LEGS|SURF, 0 }; |
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113 | return default_passes; |
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114 | } |
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115 | |
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116 | /* Initialise GPX routines. */ |
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117 | void GPX::header(const char * title) |
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118 | { |
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119 | fputs( |
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120 | "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n" |
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121 | "<gpx version=\"1.0\" creator=\""PACKAGE_STRING" (aven) - http://survex.com/\"" |
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122 | " xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\"" |
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123 | " xmlns=\"http://www.topografix.com/GPX/1/0\"" |
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124 | " xsi:schemaLocation=\"http://www.topografix.com/GPX/1/0" |
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125 | " http://www.topografix.com/GPX/1/0/gpx.xsd\">\n", fh); |
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126 | fputs("<name>", fh); |
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127 | html_escape(fh, title); |
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128 | fputs("</name>\n", fh); |
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129 | // FIXME: optional in GPX, but perhaps useful: |
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130 | // <bounds minlat="..." minlon="..." maxlat="..." maxlon="..." /> |
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131 | // NB Not necessarily the same as the bounds in survex coords translated |
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132 | // to WGS85 lat+long... |
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133 | } |
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134 | |
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135 | void |
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136 | GPX::line(const img_point *p1, const img_point *p, bool /*fSurface*/, bool fPendingMove) |
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137 | { |
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138 | if (fPendingMove) { |
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139 | if (in_trkseg) { |
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140 | fputs("</trkseg><trkseg>\n", fh); |
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141 | } else { |
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142 | fputs("<trk><trkseg>\n", fh); |
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143 | in_trkseg = true; |
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144 | } |
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145 | double X = p1->x, Y = p1->y, Z = p1->z; |
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146 | pj_transform(pj_input, pj_output, 1, 1, &X, &Y, &Z); |
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147 | X = deg(X); |
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148 | Y = deg(Y); |
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149 | // %.8f is at worst just over 1mm. |
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150 | fprintf(fh, "<trkpt lon=\"%.8f\" lat=\"%.8f\"><ele>%.2f</ele></trkpt>\n", X, Y, Z); |
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151 | } |
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152 | double X = p->x, Y = p->y, Z = p->z; |
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153 | pj_transform(pj_input, pj_output, 1, 1, &X, &Y, &Z); |
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154 | X = deg(X); |
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155 | Y = deg(Y); |
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156 | // %.8f is at worst just over 1mm. |
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157 | fprintf(fh, "<trkpt lon=\"%.8f\" lat=\"%.8f\"><ele>%.2f</ele></trkpt>\n", X, Y, Z); |
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158 | } |
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159 | |
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160 | void |
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161 | GPX::label(const img_point *p, const char *s, bool /*fSurface*/, int type) |
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162 | { |
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163 | double X = p->x, Y = p->y, Z = p->z; |
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164 | pj_transform(pj_input, pj_output, 1, 1, &X, &Y, &Z); |
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165 | X = deg(X); |
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166 | Y = deg(Y); |
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167 | // %.8f is at worst just over 1mm. |
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168 | fprintf(fh, "<wpt lon=\"%.8f\" lat=\"%.8f\"><ele>%.2f</ele><name>", X, Y, Z); |
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169 | html_escape(fh, s); |
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170 | fputs("</name>", fh); |
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171 | // Add a "pin" symbol with colour matching what aven shows. |
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172 | switch (type) { |
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173 | case FIXES: |
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174 | fputs("<sym>Pin, Red</sym>", fh); |
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175 | break; |
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176 | case EXPORTS: |
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177 | fputs("<sym>Pin, Blue</sym>", fh); |
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178 | break; |
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179 | case ENTS: |
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180 | fputs("<sym>Pin, Green</sym>", fh); |
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181 | break; |
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182 | } |
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183 | fputs("</wpt>\n", fh); |
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184 | } |
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185 | |
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186 | void |
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187 | GPX::footer() |
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188 | { |
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189 | if (in_trkseg) |
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190 | fputs("</trkseg></trk>\n", fh); |
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191 | fputs("</gpx>\n", fh); |
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192 | } |
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