source/designer/svgexporter.cpp

   1 #include <cmath>
   2 #include <msp/strings/format.h>
   3 #include <msp/strings/utils.h>
   4 #include "libr2c2/catalogue.h"
   5 #include "libr2c2/trackappearance.h"
   6 #include "libr2c2/track.h"
   7 #include "libr2c2/tracktype.h"
   8 #include "svgexporter.h"
   9
  10 using namespace std;
  11 using namespace Msp;
  12 using namespace R2C2;
  13
  14 SvgExporter::SvgExporter(const Layout &l):
  15         layout(l)
  16 { }
  17
  18 void SvgExporter::save(const string &fn)
  19 {
  20         xmlpp::Document *doc = new xmlpp::Document;
  21         root = doc->create_root_node("svg", "http://www.w3.org/2000/svg");
  22
  23         xmlpp::Element *style = root->add_child("style");
  24         style->set_attribute("type", "text/css");
  25         styles.push_back(".rail { fill: none; stroke: #000000; }");
  26         styles.push_back(".border { fill: none; stroke: #808080; }");
  27         styles.push_back(".artnr { text-anchor: middle; font-family: sans; }");
  28
  29         defs = root->add_child("defs");
  30
  31         Vector minp;
  32         Vector maxp;
  33         const set<Track *> &tracks = layout.get_all<Track>();
  34         for(set<Track *>::const_iterator i=tracks.begin(); i!=tracks.end(); ++i)
  35         {
  36                 save_track(**i);
  37
  38                 float gauge = (*i)->get_type().get_gauge();
  39                 unsigned n_endpoints = (*i)->get_type().get_endpoints().size();
  40                 for(unsigned j=0; j<n_endpoints; ++j)
  41                 {
  42                         Vector pos = (*i)->get_snap_node(j).position;
  43                         if(i==tracks.begin() && j==0)
  44                                 minp = maxp = pos;
  45                         else
  46                         {
  47                                 minp.x = min(minp.x, pos.x-gauge*3);
  48                                 minp.y = min(minp.y, pos.y-gauge*3);
  49                                 maxp.x = max(maxp.x, pos.x+gauge*3);
  50                                 maxp.y = max(maxp.y, pos.y+gauge*3);
  51                         }
  52                 }
  53         }
  54
  55         style->set_child_text(join(styles.begin(), styles.end(), "\n"));
  56
  57         root->set_attribute("viewBox", format("%.3f %.3f %.3f %.3f",
  58                 minp.x*1000, -maxp.y*1000, (maxp.x-minp.x)*1000, (maxp.y-minp.y)*1000));
  59
  60         doc->write_to_file_formatted(fn);
  61 }
  62
  63 string SvgExporter::create_appearance(const TrackAppearance &appearance)
  64 {
  65         float gauge = appearance.get_gauge();
  66         string key = format("a%.0f", gauge*1000);
  67
  68         if(!appearances_created.count(&appearance))
  69         {
  70                 float rail_width = appearance.get_rail_profile().get_width();
  71
  72                 styles.push_back(format(".%s .rail { stroke-width: %.3f }", key, rail_width*1000));
  73                 styles.push_back(format(".%s .border { stroke-width: %.3f }", key, rail_width*500));
  74                 styles.push_back(format(".%s .artnr { font-size: %.3f }", key, gauge*750));
  75
  76                 appearances_created.insert(&appearance);
  77         }
  78
  79         return key;
  80 }
  81
  82 string SvgExporter::create_point_data(const Vector &p)
  83 {
  84         return format("%.3f %.3f", p.x*1000, -p.y*1000);
  85 }
  86
  87 string SvgExporter::create_line_data(const Vector &s, const Vector &e)
  88 {
  89         return format("M %s L %s", create_point_data(s), create_point_data(e));
  90 }
  91
  92 string SvgExporter::create_curve_data(const Vector &s, const Vector &st, const Vector &et, const Vector &e)
  93 {
  94         return format("M %s C %s %s %s", create_point_data(s),
  95                 create_point_data(s+st), create_point_data(e-et), create_point_data(e));
  96 }
  97
  98 string SvgExporter::create_track_type(const TrackType &type)
  99 {
 100         const ArticleNumber &art_nr = type.get_article_number();
 101         string key = format("t%s", art_nr.str());
 102
 103         if(!tracks_created.count(&type))
 104         {
 105                 const TrackAppearance &appearance = type.get_appearance();
 106                 string appearance_key = create_appearance(appearance);
 107
 108                 xmlpp::Element *group = defs->add_child("g");
 109                 group->set_attribute("id", key);
 110                 group->set_attribute("class", appearance_key);
 111
 112                 float gauge = appearance.get_gauge();
 113                 float rail_width = appearance.get_rail_profile().get_width();
 114
 115                 const vector<TrackType::Endpoint> &endpoints = type.get_endpoints();
 116                 for(vector<TrackType::Endpoint>::const_iterator i=endpoints.begin(); i!=endpoints.end(); ++i)
 117                 {
 118                         xmlpp::Element *path = group->add_child("path");
 119                         path->set_attribute("class", "border");
 120
 121                         Vector delta = rotated_vector(Vector(0, gauge, 0), i->dir);
 122
 123                         path->set_attribute("d", create_line_data(i->pos+delta, i->pos-delta));
 124                 }
 125
 126                 const vector<TrackPart> &parts = type.get_parts();
 127                 for(vector<TrackPart>::const_iterator i=parts.begin(); i!=parts.end(); ++i)
 128                 {
 129                         xmlpp::Element *path = group->add_child("path");
 130                         path->set_attribute("class", "rail");
 131
 132                         string data;
 133
 134                         OrientedPoint start = i->get_point(0);
 135                         OrientedPoint end = i->get_point(i->get_length());
 136                         if(i->is_curved())
 137                         {
 138                                 Vector delta1 = rotated_vector(Vector(0, (gauge+rail_width)*0.5, 0), start.rotation);
 139                                 Vector delta2 = rotated_vector(Vector(0, (gauge+rail_width)*0.5, 0), end.rotation);
 140                                 // Largely an educated guess, but seems to be accurate enough
 141                                 float clen = i->get_length()/2.9;
 142                                 Vector ctrl1 = rotated_vector(Vector(clen, 0, 0), start.rotation);
 143                                 Vector ctrl2 = rotated_vector(Vector(clen, 0, 0), end.rotation);
 144
 145                                 data = create_curve_data(start.position+delta1, ctrl1, ctrl2, end.position+delta2);
 146                                 data += ' ';
 147                                 data += create_curve_data(start.position-delta1, ctrl1, ctrl2, end.position-delta2);
 148                         }
 149                         else
 150                         {
 151                                 Vector delta = rotated_vector(Vector(0, (gauge+rail_width)*0.5, 0), start.rotation);
 152
 153                                 data = create_line_data(start.position+delta, end.position+delta);
 154                                 data += ' ';
 155                                 data += create_line_data(start.position-delta ,end.position-delta);
 156                         }
 157
 158                         path->set_attribute("d", data);
 159                 }
 160
 161                 OrientedPoint label_pt = parts.front().get_point(parts.front().get_length()/2);
 162
 163                 label_pt.rotation.wrap_with_base(-Angle::quarter_turn());
 164                 if(label_pt.rotation>Angle::quarter_turn())
 165                         label_pt.rotation -= Angle::half_turn();
 166
 167                 label_pt.position += rotated_vector(Vector(0, -gauge*0.25, 0), label_pt.rotation);
 168
 169                 xmlpp::Element *text = group->add_child("text");
 170                 text->set_attribute("class", "artnr");
 171                 text->set_attribute("transform", format("translate(%s) rotate(%.3f)",
 172                         create_point_data(label_pt.position), -label_pt.rotation.degrees()));
 173                 text->set_child_text(type.get_article_number().str());
 174
 175                 tracks_created.insert(&type);
 176         }
 177
 178         return key;
 179 }
 180
 181 void SvgExporter::save_track(const Track &track)
 182 {
 183         string type_key = create_track_type(track.get_type());
 184         xmlpp::Element *use = root->add_child("use");
 185
 186         const Vector &pos = track.get_position();
 187         const Angle &rot = track.get_rotation();
 188         string transform = format("translate(%s) rotate(%.3f)", create_point_data(pos), -rot.degrees());
 189         use->set_attribute("transform", transform);
 190
 191         use->set_attribute("xlink:href", "#"+type_key);
 192 }