source/designer/svgexporter.cpp

   1 #include <cmath>
   2 #include <msp/strings/formatter.h>
   3 #include "libr2c2/catalogue.h"
   4 #include "libr2c2/track.h"
   5 #include "libr2c2/tracktype.h"
   6 #include "svgexporter.h"
   7
   8 using namespace std;
   9 using namespace Msp;
  10 using namespace R2C2;
  11
  12 SvgExporter::SvgExporter(const Layout &l):
  13         layout(l),
  14         gauge(0),
  15         rail_width(0)
  16 { }
  17
  18 void SvgExporter::save(const string &fn)
  19 {
  20         gauge = layout.get_catalogue().get_gauge()*1000;
  21
  22         const Profile &rail_profile = layout.get_catalogue().get_rail_profile();
  23         const Vector &rail_min = rail_profile.get_min_coords();
  24         const Vector &rail_max = rail_profile.get_max_coords();
  25         rail_width = (rail_max.x-rail_min.x)*1000;
  26
  27         xmlpp::Document *doc = new xmlpp::Document;
  28         xmlpp::Element *root = doc->create_root_node("svg", "http://www.w3.org/2000/svg");
  29
  30         xmlpp::Element *style = root->add_child("style");
  31         style->set_attribute("type", "text/css");
  32         style->set_child_text(format("\n.rail { fill: none; stroke: #000000; stroke-width: %.3f; }\n"
  33                 ".endpoint { fill: none; stroke: #808080; stroke-width: %.3f; }\n"
  34                 ".artnr { text-anchor: middle; font-size: %.3f; }\n",
  35                 rail_width, rail_width, gauge*0.75));
  36
  37         Vector minp;
  38         Vector maxp;
  39         const set<Track *> &tracks = layout.get_tracks();
  40         for(set<Track *>::const_iterator i=tracks.begin(); i!=tracks.end(); ++i)
  41         {
  42                 xmlpp::Element *elem = root->add_child("g");
  43                 save_track(**i, *elem);
  44
  45                 unsigned n_endpoints = (*i)->get_type().get_endpoints().size();
  46                 for(unsigned j=0; j<n_endpoints; ++j)
  47                 {
  48                         Vector pos = (*i)->get_endpoint_position(j);
  49                         if(i==tracks.begin() && j==0)
  50                                 minp = maxp = pos;
  51                         else
  52                         {
  53                                 minp.x = min(minp.x, pos.x);
  54                                 minp.y = min(minp.y, pos.y);
  55                                 maxp.x = max(maxp.x, pos.x);
  56                                 maxp.y = max(maxp.y, pos.y);
  57                         }
  58                 }
  59         }
  60
  61         root->set_attribute("viewBox", format("%.3f %.3f %.3f %.3f",
  62                 minp.x*1000-gauge*3, -maxp.y*1000-gauge*3, (maxp.x-minp.x)*1000+gauge*6, (maxp.y-minp.y)*1000+gauge*6));
  63
  64         doc->write_to_file_formatted(fn);
  65 }
  66
  67 void SvgExporter::save_track(const Track &track, xmlpp::Element &group)
  68 {
  69         const Vector &pos = track.get_position();
  70         float rot = track.get_rotation();
  71         string transform = format("translate(%.3f %.3f) rotate(%.3f)", pos.x*1000, -pos.y*1000, -rot*180/M_PI);
  72         group.set_attribute("transform", transform);
  73
  74         const TrackType &type = track.get_type();
  75
  76         const vector<TrackType::Endpoint> &endpoints = type.get_endpoints();
  77         for(vector<TrackType::Endpoint>::const_iterator i=endpoints.begin(); i!=endpoints.end(); ++i)
  78         {
  79                 xmlpp::Element *elem = group.add_child("path");
  80                 elem->set_attribute("class", "endpoint");
  81
  82                 float dx = -sin(i->dir)*gauge;
  83                 float dy = -cos(i->dir)*gauge;
  84
  85                 string data = format("M %.3f %.3f L %.3f %.3f",
  86                         i->pos.x*1000+dx, -i->pos.y*1000+dy,
  87                         i->pos.x*1000-dx, -i->pos.y*1000-dy);
  88                 elem->set_attribute("d", data);
  89         }
  90
  91         const vector<TrackPart> &parts = type.get_parts();
  92         for(vector<TrackPart>::const_iterator i=parts.begin(); i!=parts.end(); ++i)
  93         {
  94                 TrackPoint start = i->get_point(0);
  95                 TrackPoint end = i->get_point(i->get_length());
  96                 if(i->is_curved())
  97                 {
  98                         xmlpp::Element *elem = group.add_child("path");
  99                         elem->set_attribute("class", "rail");
 100
 101                         float cs = cos(start.dir);
 102                         float ss = sin(start.dir);
 103                         float ce = cos(end.dir);
 104                         float se = sin(end.dir);
 105                         float dx1 = -ss*(gauge+rail_width)*0.5;
 106                         float dy1 = -cs*(gauge+rail_width)*0.5;
 107                         float dx2 = -se*(gauge+rail_width)*0.5;
 108                         float dy2 = -ce*(gauge+rail_width)*0.5;
 109                         // Largely an educated guess, but seems to be accurate enough
 110                         float clen = i->get_length()*1000/2.9;
 111
 112                         string data = format("M %.3f %.3f C %.3f %.3f %.3f %.3f %.3f %.3f")
 113                                 (start.pos.x*1000+dx1)(-start.pos.y*1000+dy1)
 114                                 (start.pos.x*1000+dx1+cs*clen)(-start.pos.y*1000+dy1-ss*clen)
 115                                 (end.pos.x*1000+dx2-ce*clen)(-end.pos.y*1000+dy2+se*clen)
 116                                 (end.pos.x*1000+dx2)(-end.pos.y*1000+dy2).str();
 117                         data += format(" M %.3f %.3f C %.3f %.3f %.3f %.3f %.3f %.3f")
 118                                 (start.pos.x*1000-dx1)(-start.pos.y*1000-dy1)
 119                                 (start.pos.x*1000-dx1+cs*clen)(-start.pos.y*1000-dy1-ss*clen)
 120                                 (end.pos.x*1000-dx2-ce*clen)(-end.pos.y*1000-dy2+se*clen)
 121                                 (end.pos.x*1000-dx2)(-end.pos.y*1000-dy2).str();
 122                         elem->set_attribute("d", data);
 123                 }
 124                 else
 125                 {
 126                         xmlpp::Element *elem = group.add_child("path");
 127                         elem->set_attribute("class", "rail");
 128
 129                         float dx = -sin(start.dir)*(gauge+rail_width)*0.5;
 130                         float dy = -cos(start.dir)*(gauge+rail_width)*0.5;
 131
 132                         string data = format("M %.3f %.3f L %.3f %.3f",
 133                                 start.pos.x*1000+dx, -start.pos.y*1000+dy,
 134                                 end.pos.x*1000+dx, -end.pos.y*1000+dy);
 135                         data += format(" M %.3f %.3f L %.3f %.3f",
 136                                 start.pos.x*1000-dx, -start.pos.y*1000-dy,
 137                                 end.pos.x*1000-dx, -end.pos.y*1000-dy);
 138                         elem->set_attribute("d", data);
 139                 }
 140         }
 141
 142         TrackPoint label_pt = parts.front().get_point(parts.front().get_length()/2);
 143
 144         while(rot+label_pt.dir>M_PI/2)
 145                 label_pt.dir -= M_PI;
 146         while(rot+label_pt.dir<-M_PI/2)
 147                 label_pt.dir += M_PI;
 148
 149         label_pt.pos.x = label_pt.pos.x*1000+sin(label_pt.dir)*gauge*0.25;
 150         label_pt.pos.y = label_pt.pos.y*1000-cos(label_pt.dir)*gauge*0.25;
 151
 152         xmlpp::Element *elem = group.add_child("text");
 153         elem->set_attribute("class", "artnr");
 154         elem->set_attribute("transform", format("translate(%.3f %.3f) rotate(%.3f)",
 155                 label_pt.pos.x, -label_pt.pos.y, -label_pt.dir*180/M_PI));
 156         elem->set_child_text(track.get_type().get_article_number().str());
 157 }