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