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-rw-r--r--source/ProbabDistrib.cpp142
1 files changed, 0 insertions, 142 deletions
diff --git a/source/ProbabDistrib.cpp b/source/ProbabDistrib.cpp
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--- a/source/ProbabDistrib.cpp
+++ /dev/null
@@ -1,142 +0,0 @@
-
-// ProbabDistrib.cpp
-
-// Implements the cProbabDistrib class representing a discrete probability distribution curve and random generator
-
-#include "Globals.h"
-#include "ProbabDistrib.h"
-#include "MersenneTwister.h"
-
-
-
-
-
-
-cProbabDistrib::cProbabDistrib(int a_MaxValue) :
- m_MaxValue(a_MaxValue),
- m_Sum(-1)
-{
-}
-
-
-
-
-
-
-void cProbabDistrib::SetPoints(const cProbabDistrib::cPoints & a_Points)
-{
- ASSERT(!a_Points.empty());
- m_Sum = 0;
- m_Cumulative.clear();
- m_Cumulative.reserve(a_Points.size() + 1);
- int ProbSum = 0;
- int LastProb = 0;
- int LastValue = -1;
- if (a_Points[0].m_Value != 0)
- {
- m_Cumulative.push_back(cPoint(0, 0)); // Always push in the [0, 0] point for easier search algorithm bounds
- LastValue = 0;
- }
- for (cPoints::const_iterator itr = a_Points.begin(), end = a_Points.end(); itr != end; ++itr)
- {
- if (itr->m_Value == LastValue)
- {
- continue;
- }
-
- // Add the current trapezoid to the sum:
- ProbSum += (LastProb + itr->m_Probability) * (itr->m_Value - LastValue) / 2;
- LastProb = itr->m_Probability;
- LastValue = itr->m_Value;
- m_Cumulative.push_back(cPoint(itr->m_Value, ProbSum));
- } // for itr - a_Points[]
- if (LastValue != m_MaxValue)
- {
- m_Cumulative.push_back(cPoint(m_MaxValue, 0)); // Always push in the last point for easier search algorithm bounds
- }
- m_Sum = ProbSum;
-}
-
-
-
-
-
-bool cProbabDistrib::SetDefString(const AString & a_DefString)
-{
- AStringVector Points = StringSplitAndTrim(a_DefString, ";");
- if (Points.empty())
- {
- return false;
- }
- cPoints Pts;
- for (AStringVector::const_iterator itr = Points.begin(), end = Points.end(); itr != end; ++itr)
- {
- AStringVector Split = StringSplitAndTrim(*itr, ",");
- if (Split.size() != 2)
- {
- // Bad format
- return false;
- }
- int Value = atoi(Split[0].c_str());
- int Prob = atoi(Split[1].c_str());
- if (
- ((Value == 0) && (Split[0] != "0")) ||
- ((Prob == 0) && (Split[1] != "0"))
- )
- {
- // Number parse error
- return false;
- }
- Pts.push_back(cPoint(Value, Prob));
- } // for itr - Points[]
-
- SetPoints(Pts);
- return true;
-}
-
-
-
-
-
-int cProbabDistrib::Random(MTRand & a_Rand) const
-{
- int v = a_Rand.randInt(m_Sum);
- return MapValue(v);
-}
-
-
-
-
-
-int cProbabDistrib::MapValue(int a_OrigValue) const
-{
- ASSERT(a_OrigValue >= 0);
- ASSERT(a_OrigValue < m_Sum);
-
- // Binary search through m_Cumulative for placement:
- size_t Lo = 0;
- size_t Hi = m_Cumulative.size() - 1;
- while (Hi - Lo > 1)
- {
- int Mid = (Lo + Hi) / 2;
- int MidProbab = m_Cumulative[Mid].m_Probability;
- if (MidProbab < a_OrigValue)
- {
- Lo = Mid;
- }
- else
- {
- Hi = Mid;
- }
- }
- ASSERT(Hi - Lo == 1);
-
- // Linearly interpolate between Lo and Hi:
- int ProbDif = m_Cumulative[Hi].m_Probability - m_Cumulative[Lo].m_Probability;
- int ValueDif = m_Cumulative[Hi].m_Value - m_Cumulative[Lo].m_Value;
- return m_Cumulative[Lo].m_Value + (a_OrigValue - m_Cumulative[Lo].m_Probability) * ValueDif / ProbDif;
-}
-
-
-
-