geowin_poly_choice.c

来自「A Library of Efficient Data Types and Al」· C语言 代码 · 共 77 行

#include <LEDA/geowin.h>
#include <LEDA/plane_alg.h>

static void f_unite( const list<rat_gen_polygon>& Lin, rat_gen_polygon& Lout)
{ if( Lin.length() < 2 ) return;
  rat_gen_polygon p1=Lin[Lin[0]];
  rat_gen_polygon p2=Lin[Lin[1]];
  Lout =p1.unite(p2);
}

static void f_inter( const list<rat_gen_polygon>& Lin, rat_gen_polygon& Lout)
{ if( Lin.length() < 2 ) return;
  rat_gen_polygon p1=Lin[Lin[0]];
  rat_gen_polygon p2=Lin[Lin[1]];
  Lout=p1.intersection(p2);
}

static void f_diff( const list<rat_gen_polygon>& Lin, rat_gen_polygon& Lout)
{ if( Lin.length() < 2 ) return;
  rat_gen_polygon p1=Lin[Lin[0]];
  rat_gen_polygon p2=Lin[Lin[1]];
  Lout=p1.diff(p2);
}

static void f_sdiff( const list<rat_gen_polygon>& Lin, rat_gen_polygon& Lout)
{ if( Lin.length() < 2 ) return;
  rat_gen_polygon p1=Lin[Lin[0]];
  rat_gen_polygon p2=Lin[Lin[1]];
  Lout=p1.sym_diff(p2);
}

int main()
{
  GeoWin gw("Polygon Demo");

  geo_scene  sc[4];
  list<rat_gen_polygon> L;
  geo_scene input = geowin_new_scene(gw, L); 
  gw.set_fill_color(input, invisible);
  
  geowin_update<list<rat_gen_polygon>, list<rat_gen_polygon> > unite(f_unite);
  geowin_update<list<rat_gen_polygon>, list<rat_gen_polygon> > inter(f_inter);
  geowin_update<list<rat_gen_polygon>, list<rat_gen_polygon> > diff(f_diff);
  geowin_update<list<rat_gen_polygon>, list<rat_gen_polygon> > sdiff(f_sdiff);
       
  sc[0] = geowin_new_scene(gw, unite, input, "Union");
  gw.set_color(sc[0], blue);
  gw.set_fill_color(sc[0], blue);

  sc[1] = geowin_new_scene(gw, inter, input, "Intersection");
  gw.set_color(sc[1], red);
  gw.set_fill_color(sc[1], red);

  sc[2] = geowin_new_scene(gw, diff, input, "Difference");
  gw.set_color(sc[2], green );
  gw.set_fill_color(sc[2], green);

  sc[3] = geowin_new_scene(gw, sdiff, input, "Symmetric Difference");  
  gw.set_color(sc[3], yellow );
  gw.set_fill_color(sc[3], yellow);
  
  gw.set_all_visible(true);

  list<geo_scene> vis_scenes;
  vis_scenes.append(sc[0]); vis_scenes.append(sc[1]);
  vis_scenes.append(sc[2]); vis_scenes.append(sc[3]);
  
  list<string> choices;
  choices.append("union"); choices.append("inter");
  choices.append("diff"); choices.append("sdiff");

  gw.add_scene_buttons(vis_scenes, choices);
  gw.edit(input);

  return 0;
}