From d92b12e9c05c435b3a08819afe377de5533e4544 Mon Sep 17 00:00:00 2001
From: Emmanuel Christophe <emmanuel.christophe@orfeo-toolbox.org>
Date: Mon, 9 Feb 2009 23:02:41 +0800
Subject: [PATCH] ENH: add caching for path length computation
---
.../otbPolyLineParametricPathWithValue.h | 6 +++++
.../otbPolyLineParametricPathWithValue.txx | 25 ++++++++++++++++++-
2 files changed, 30 insertions(+), 1 deletion(-)
diff --git a/Code/Common/otbPolyLineParametricPathWithValue.h b/Code/Common/otbPolyLineParametricPathWithValue.h
index 379c4a924b..ffabc0caaf 100644
--- a/Code/Common/otbPolyLineParametricPathWithValue.h
+++ b/Code/Common/otbPolyLineParametricPathWithValue.h
@@ -86,6 +86,8 @@ public:
*/
virtual double GetLength() const;
+ void AddVertex (const ContinuousIndexType &vertex);
+
protected:
/** Constructor */
PolyLineParametricPathWithValue();
@@ -95,10 +97,14 @@ protected:
/**PrintSelf method */
virtual void PrintSelf(std::ostream& os, itk::Indent indent) const;
+ virtual void ComputeLength() const;
+
private:
PolyLineParametricPathWithValue(const Self&); //purposely not implemented
void operator=(const Self&); //purposely not implemented
std::string m_Key;
+ mutable double m_Length;
+ mutable bool m_LengthIsValid;
};
}// End namespace otb
diff --git a/Code/Common/otbPolyLineParametricPathWithValue.txx b/Code/Common/otbPolyLineParametricPathWithValue.txx
index 4835b86344..5031fb4a31 100644
--- a/Code/Common/otbPolyLineParametricPathWithValue.txx
+++ b/Code/Common/otbPolyLineParametricPathWithValue.txx
@@ -32,11 +32,33 @@ PolyLineParametricPathWithValue<TValue,VDimension>
itk::MetaDataDictionary & dict = this->GetMetaDataDictionary();
m_Key = "Value";
itk::EncapsulateMetaData<ValueType>(dict,m_Key,0);
+ m_LengthIsValid = false;
+ m_Length = -1.0;
+}
+
+template < class TValue,unsigned int VDimension>
+void PolyLineParametricPathWithValue<TValue,VDimension>
+::AddVertex(const ContinuousIndexType &vertex)
+{
+ Superclass::AddVertex(vertex);
+ m_LengthIsValid=false;
}
template < class TValue,unsigned int VDimension>
double PolyLineParametricPathWithValue<TValue,VDimension>
::GetLength() const
+{
+ if (!m_LengthIsValid)
+ {
+ ComputeLength();
+ }
+ return m_Length;
+}
+
+template < class TValue,unsigned int VDimension>
+void
+PolyLineParametricPathWithValue<TValue,VDimension>
+::ComputeLength() const
{
double length = 0.0;
VertexListConstIteratorType it = this->GetVertexList()->Begin();
@@ -68,7 +90,8 @@ double PolyLineParametricPathWithValue<TValue,VDimension>
length = 0.0;
}
- return length;
+ m_Length = length;
+ m_LengthIsValid = true;
}
--
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