boxes.hh

   1 /*
   2     some 2D geometrical concepts
   3 */
   4
   5 #ifndef BOXES_HH
   6 #define BOXES_HH
   7
   8 #include "textdb.hh"
   9 #include "real.hh"
  10 #include "vray.hh"
  11
  12 /// 2d vector
  13 struct Offset {
  14     Real x,y;
  15
  16     Offset operator+(Offset o)const {
  17         Offset r(*this);
  18         r+=o;
  19         return r;
  20     }
  21
  22     Offset operator+=(Offset o) {
  23         x+=o.x;
  24         y+=o.y;
  25         return *this;
  26     }
  27     Offset(Real ix , Real iy) {
  28         x=ix;
  29         y=iy;
  30     }
  31     Offset() {
  32         x=0.0;
  33         y=0.0;
  34     }
  35 };
  36
  37 /// a Real interval
  38 struct Interval {
  39     Real min, max;
  40
  41     void translate(Real t) {
  42         min += t;
  43         max += t;
  44     }
  45
  46     void unite(Interval h) {
  47         if (h.min<min)
  48             min = h.min;
  49         if (h.max>max)
  50             max = h.max;
  51     }
  52     Real length() const;
  53     void set_empty() ;
  54     bool empty() { return min > max; }
  55     Interval() {
  56         set_empty();
  57     }
  58     Interval(Real m, Real M) {
  59         min =m;
  60         max = M;
  61     }
  62 };
  63
  64
  65 /// a 4-tuple of #Real#s
  66 struct Box {
  67     Interval x, y;
  68
  69     void translate(Offset o) {
  70         x.translate(o.x);
  71         y.translate(o.y);
  72     }
  73     void unite(Box b) {
  74         x.unite(b.x);
  75         y.unite(b.y);
  76     }
  77     Box(svec<Real> );
  78     Box();
  79     Box(Interval ix, Interval iy);
  80 };
  81
  82
  83 #endif