From 355ff89d1860f8d928bbc97a542b4560c257b9e6 Mon Sep 17 00:00:00 2001
From: Gard Spreemann <gspr@nonempty.org>
Date: Wed, 5 Aug 2020 16:12:17 +0200
Subject: Improve.

---
 include/pd.hpp | 82 ++++++++++++++++++++++++++++++++++++++++++++++------------
 1 file changed, 66 insertions(+), 16 deletions(-)

(limited to 'include/pd.hpp')

diff --git a/include/pd.hpp b/include/pd.hpp
index 04b8609..2641125 100644
--- a/include/pd.hpp
+++ b/include/pd.hpp
@@ -3,22 +3,32 @@
 #include <cstdint>
 #include <fstream>
 #include <limits>
+#include <map>
 #include <string>
 #include <vector>
 
 #include "misc.hpp"
 
-template <typename T> class PD
+template <typename T> class Interval
 {
 public:
-  class Interval
-  {
-  public:
-    T birth;
-    T death;
-  };
+  inline T length() const { return death - birth; }
+  T birth;
+  T death;
+};
 
-  
+template <typename T> inline bool operator==(Interval<T> x, Interval<T> y) { return x.birth == y.birth && x.death == y.death; }
+template <typename T> inline bool operator!=(Interval<T> x, Interval<T> y) { return !(x == y); }
+template <typename T> inline bool operator<(Interval<T> x, Interval<T> y)
+{
+  return (x.length() < y.length()) ||
+    ((x.length() == y.length()) && (x.birth < y.birth)) ||
+    (((x.length() == y.length()) && (x.birth == y.birth) && (x.death < y.death)));
+}
+
+template <typename T> class PD
+{
+public:
   PD() : intervals()
   {
   };
@@ -27,7 +37,7 @@ public:
   {
     if (m > 0 && b < d)
     {
-      Interval interval;
+      Interval<T> interval;
       interval.birth = b;
       interval.death = d;
       intervals.push_back(std::make_pair(interval, m));
@@ -45,18 +55,58 @@ public:
     }
   }
 
-  typename std::vector<std::pair<PD<T>::Interval, unsigned int> >::size_type size() const { return intervals.size(); }
+  void discretize(T delta)
+  {
+    if (delta <= 0)
+      return;
+    for (auto it = begin(); it != end(); ++it)
+    {
+      it->first.birth = std::round(it->first.birth/delta)*delta;
+      it->first.death = std::round(it->first.death/delta)*delta;
+    }
+  } 
+
+  void compress_and_sort()
+  {
+    std::map<Interval<T>, unsigned int> tmp;
+    for (auto it = cbegin(); it != cend(); ++it)
+    {
+      auto existing = tmp.find(it->first);
+      if (existing == tmp.end())
+      {
+        tmp.insert(*it);
+      }
+      else
+      {
+        existing->second += it->second;
+      }
+    }
+    intervals = std::vector<std::pair<Interval<T>, unsigned int> >(tmp.cbegin(), tmp.cend());
+  }
+
+  unsigned int size() const
+  {
+    unsigned int ret = 0;
+    for (auto it = cbegin(); it != cend(); ++it)
+      ret += it->second;
+    return ret;
+  }
+
+  inline typename std::vector<std::pair<Interval<T>, unsigned int> >::size_type size_2() const { return intervals.size(); }
 
-  using Iterator = typename std::vector<std::pair<PD<T>::Interval, unsigned int> >::const_iterator;
+  using Iterator = typename std::vector<std::pair<Interval<T>, unsigned int> >::iterator;
+  using Const_iterator = typename std::vector<std::pair<Interval<T>, unsigned int> >::const_iterator;
 
-  inline Iterator cbegin() const { return intervals.cbegin(); }
-  inline Iterator cend() const { return intervals.cend(); }
+  inline Const_iterator cbegin() const { return intervals.cbegin(); }
+  inline Const_iterator cend() const { return intervals.cend(); }
+  inline Iterator begin() { return intervals.begin(); }
+  inline Iterator end() { return intervals.end(); }
   
 private:
-  std::vector<std::pair<PD<T>::Interval, unsigned int> > intervals;
+  std::vector<std::pair<Interval<T>, unsigned int> > intervals;
 };
 
-inline double sqdist(PD<double>::Interval x, PD<double>::Interval y)
+template <typename T> inline T sqdist(Interval<T> x, Interval<T> y)
 {
   return (x.birth - y.birth)*(x.birth - y.birth) + (x.death - y.death)*(x.death - y.death);
 }
@@ -68,7 +118,7 @@ template <typename T> T heat_kernel(T sigma, const PD<T> & a, const PD<T> & b)
   for (auto it = a.cbegin(); it != a.cend(); ++it)
   {
     auto x = *it;
-    typename PD<T>::Interval xbar;
+    Interval<T> xbar;
     xbar.birth = x.first.death;
     xbar.death = x.first.birth;
 
-- 
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