geom/aabb: rename p0,p1 to lo,hi

this makes their meaning more explicit

geom/aabb.cpp

@@ -24,78 +24,13 @@
 using util::geom::aabb;
 
 
-///////////////////////////////////////////////////////////////////////////////
-template <size_t S, typename T>
-aabb<S,T>::aabb (const point<S,T> _p0, const point<S,T> _p1):
-    p0 (_p0),
-    p1 (_p1)
-{
-    debug::sanity (*this);
-}
-
-
-///////////////////////////////////////////////////////////////////////////////
-template <size_t S, typename T>
-T
-aabb<S,T>::diameter (void) const
-{
-    return magnitude ().diameter ();
-}
-
-
-//-----------------------------------------------------------------------------
-template <size_t S, typename T>
-util::extent<S,T>
-aabb<S,T>::magnitude (void) const
-{
-    return (p1 - p0).template as<util::extent> ();
-}
-
-
-//-----------------------------------------------------------------------------
-template <size_t S, typename T>
-util::point<S,T>
-aabb<S,T>::closest (const point<S,T> q) const
-{
-    return limit (q, p0, p1);
-}
-
-
-//-----------------------------------------------------------------------------
-template <size_t S, typename T>
-void
-aabb<S,T>::cover (const point<S,T> p)
-{
-    p0 = min (p, p0);
-    p1 = max (p, p1);
-}
-
-
-///////////////////////////////////////////////////////////////////////////////
-template <size_t S, typename T>
-aabb<S,T>
-aabb<S,T>::operator+ (const vector<S,T> v) const
-{
-    return { p0 + v, p1 + v };
-}
-
-
-//-----------------------------------------------------------------------------
-template <size_t S, typename T>
-aabb<S,T>
-aabb<S,T>::operator- (const vector<S,T> v) const
-{
-    return { p0 - v, p1 - v };
-}
-
-
 ///////////////////////////////////////////////////////////////////////////////
 namespace util::debug {
     template <size_t S, typename T>
     struct validator<aabb<S,T>> {
         static bool is_valid (const aabb<S,T> &b)
         {
-            return all (b.p0 <= b.p1);
+            return all (b.lo <= b.hi);
         }
     };
 }
@@ -106,7 +41,7 @@ template <size_t S, typename T>
 std::ostream&
 util::geom::operator<< (std::ostream &os, util::geom::aabb<S,T> b)
 {
-    return os << "[ " << b.p0 << ", " << b.p1 << " ]";
+    return os << "[ " << b.lo << ", " << b.hi << " ]";
 }
 
 

geom/aabb.hpp

@@ -18,8 +18,9 @@
 #ifndef CRUFT_UTIL_GEOM_AABB_HPP
 #define CRUFT_UTIL_GEOM_AABB_HPP
 
-#include "../point.hpp"
+#include "../debug.hpp"
 #include "../extent.hpp"
+#include "../point.hpp"
 
 #include <cstdint>
 
@@ -27,30 +28,73 @@ namespace util::geom {
     ///////////////////////////////////////////////////////////////////////////
     /// represents an axis-aligned bounding-box through two opposing corners.
     ///
-    /// p0 must be less-than-or-equal to p1. equality is allowed so that we
-    /// can represent zero sized bounding-boxes.
+    /// `lo' must be less-than-or-equal to `hi'. equality is allowed so that
+    /// we can represent zero sized bounding-boxes.
     template <size_t S, typename T>
     struct aabb {
         aabb () = default;
-        aabb (point<S,T>, point<S,T>);
+        aabb (point<S,T> _lo, point<S,T> _hi):
+            lo (_lo),
+            hi (_hi)
+        {
+            CHECK (all (lo <= hi));
+        }
 
-        extent<S,T> magnitude (void) const;
-        T diameter (void) const;
 
+        ///////////////////////////////////////////////////////////////////////
+        extent<S,T>
+        magnitude (void) const
+        {
+            return (hi - lo).template as<util::extent> ();
+        }
+
+
+        //---------------------------------------------------------------------
+        T
+        diameter (void) const
+        {
+            return magnitude ().diameter ();
+        }
+
+
+        //---------------------------------------------------------------------
         /// tests whether a point lies within the region, inclusive of borders
         constexpr bool
         inclusive (point<S,T> p) const noexcept
-        { return all (p0 <= p && p1 >= p); }
+        { return all (lo <= p && hi >= p); }
 
-        point<S,T> closest (point<S,T>) const;
 
-        void cover (point<S,T>);
+        //---------------------------------------------------------------------
+        point<S,T>
+        closest (point<S,T> query) const
+        {
+            return limit (query, lo, hi);
+        }
 
-        aabb<S,T> operator+ (vector<S,T>) const;
-        aabb<S,T> operator- (vector<S,T>) const;
 
-        ::util::point<S,T> p0;
-        ::util::point<S,T> p1;
+        //---------------------------------------------------------------------
+        void cover (point<S,T> p)
+        {
+            lo = min (p, lo);
+            hi = max (p, hi);
+        }
+
+
+        //---------------------------------------------------------------------
+        aabb<S,T> operator+ (vector<S,T> v) const
+        {
+            return { lo + v, hi + v };
+        }
+
+
+        aabb<S,T> operator- (vector<S,T> v) const
+        {
+            return { lo - v, hi - v };
+        }
+
+
+        ::util::point<S,T> lo;
+        ::util::point<S,T> hi;
     };
 
 
@@ -59,7 +103,7 @@ namespace util::geom {
     constexpr bool
     operator== (const aabb<S,T> &a, const aabb<S,T> &b) noexcept
     {
-        return a.p0 == b.p0 && a.p1 == b.p1;
+        return a.lo == b.lo && a.hi == b.hi;
     }
 
 
@@ -90,7 +134,7 @@ namespace util::geom {
             point<S,T> p;
             std::generate (p.begin (), p.end (), [&] (void) { return d (g); });
 
-            return p * (b.p1 - b.p0) + b.p0.template as<util::vector> ();
+            return p * (b.hi - b.lo) + b.lo.template as<util::vector> ();
         }
     };
 }

geom/ray.cpp

@@ -46,8 +46,8 @@ template <size_t S, typename T>
 T
 ray<S,T>::intersect (aabb<S,T> r) const
 {
-    auto t1 = (r.p0 - origin) / direction;
-    auto t2 = (r.p1 - origin) / direction;
+    auto t1 = (r.lo - origin) / direction;
+    auto t2 = (r.hi - origin) / direction;
 
     auto vmin = min (t1, t2);
     auto vmax = max (t1, t2);