lilypond-0.0.1

diff --git a/boxes.hh b/boxes.hh
new file mode 100644 (file)
index 0000000..4413169
--- /dev/null
+++ b/boxes.hh
@@ -0,0 +1,82 @@
+/*
+    some 2D geometrical concepts
+*/
+
+#ifndef BOXES_HH
+#define BOXES_HH
+
+#include "textdb.hh"
+#include "real.hh"
+#include "vray.hh"
+
+/// 2d vector 
+struct Offset {
+    Real x,y;
+
+    Offset operator+(Offset o)const {
+       Offset r(*this);
+       r+=o;
+       return r;
+    }
+    
+    Offset operator+=(Offset o) {
+       x+=o.x;
+       y+=o.y;
+       return *this;
+    }
+    Offset(Real ix , Real iy) {
+       x=ix;
+       y=iy;
+    }
+    Offset() {
+       x=0.0;
+       y=0.0;
+    }
+};
+
+/// a Real interval
+struct Interval {
+    Real min, max;
+
+    void translate(Real t) {
+       min += t;
+       max += t;
+    }
+
+    void unite(Interval h) {
+       if (h.min<min)
+           min = h.min;
+       if (h.max>max)
+           max = h.max;
+    }
+    
+    void set_empty() ;
+    bool empty() { return min > max; }
+    Interval() {
+       set_empty();
+    }
+    Interval(Real m, Real M) {
+       min =m;
+       max = M;
+    }
+};
+
+
+/// a 4-tuple of #Real#s
+struct Box {
+    Interval x, y;
+    
+    void translate(Offset o) {
+       x.translate(o.x);
+       y.translate(o.y);
+    }
+    void unite(Box b) {
+       x.unite(b.x);
+       y.unite(b.y);
+    }
+    Box(svec<Real> );
+    Box();
+};
+
+
+#endif