source/libr2c2/object.cpp

   1 #include <stdexcept>
   2 #include "object.h"
   3
   4 using namespace std;
   5
   6 namespace R2C2 {
   7
   8 Snap Object::get_snap_node(unsigned) const
   9 {
  10         throw out_of_range("Object::get_snap_node");
  11 }
  12
  13 bool Object::snap(Snap &sn, float limit, SnapType what) const
  14 {
  15         if(what&SNAP_NODE)
  16         {
  17                 unsigned nsn = get_n_snap_nodes();
  18                 for(unsigned i=0; i<nsn; ++i)
  19                 {
  20                         Snap node = get_snap_node(i);
  21                         Vector span = sn.position-node.position;
  22                         if(dot(span, span)<limit*limit)
  23                         {
  24                                 sn = node;
  25                                 return true;
  26                         }
  27                 }
  28         }
  29
  30         return false;
  31 }
  32
  33 bool Object::snap_to(const Object &other, float limit, SnapType what)
  34 {
  35         if(what==SNAP_DEFAULT)
  36                 what = get_default_snap_type_to(other);
  37
  38         if(!what)
  39                 return false;
  40
  41         unsigned nsn = get_n_snap_nodes();
  42         for(unsigned i=0; i<nsn; ++i)
  43         {
  44                 Snap sn = get_snap_node(i);
  45                 Snap ssn = sn;
  46                 if(other.snap(ssn, limit, what))
  47                 {
  48                         set_rotation(rotation+ssn.rotation-sn.rotation-Angle::half_turn());
  49                         sn = get_snap_node(i);
  50                         position += ssn.position-sn.position;
  51                         return true;
  52                 }
  53         }
  54
  55         return false;
  56 }
  57
  58 Object *Object::get_link(unsigned) const
  59 {
  60         throw out_of_range("Object::get_link");
  61 }
  62
  63 bool Object::break_link(Object &other)
  64 {
  65         unsigned nls = get_n_link_slots();
  66         for(unsigned i=0; i<nls; ++i)
  67                 if(get_link(i)==&other)
  68                         return break_link(i);
  69
  70         return false;
  71 }
  72
  73 void Object::break_links()
  74 {
  75         unsigned nls = get_n_link_slots();
  76         for(unsigned i=0; i<nls; ++i)
  77                 break_link(i);
  78 }
  79
  80 } // namespace R2C2