From 4b620a45ea7960dfe2833e78f92a5990a49927f5 Mon Sep 17 00:00:00 2001
From: Samuel Fadel <samuelfadel@gmail.com>
Date: Mon, 25 Jan 2016 19:51:19 +0100
Subject: LinearScale: additional helper methods.

---
 scale.h | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/scale.h b/scale.h
index ccf23c5..4c3f341 100644
--- a/scale.h
+++ b/scale.h
@@ -18,6 +18,11 @@ public:
 
     virtual ~Scale() {}
 
+    T rangeMin() const  { return m_rangeMin; }
+    T rangeMax() const  { return m_rangeMax; }
+    T domainMin() const { return m_domainMin; }
+    T domainMax() const { return m_domainMax; }
+
     void setRangeMin(T rangeMin)   { m_rangeMin  = rangeMin; valuesUpdated(); }
     void setRangeMax(T rangeMax)   { m_rangeMax  = rangeMax; valuesUpdated(); }
     void setDomainMin(T domainMin) { m_domainMin = domainMin; valuesUpdated(); }
@@ -30,6 +35,11 @@ public:
         valuesUpdated();
     }
 
+    void setRange(const Scale<T> &other)
+    {
+        setRange(other.m_rangeMin, other.m_rangeMax);
+    }
+
     void setDomain(const T &domainMin, const T &domainMax)
     {
         m_domainMin = domainMin;
@@ -37,6 +47,11 @@ public:
         valuesUpdated();
     }
 
+    void setDomain(const Scale<T> &other)
+    {
+        setDomain(other.m_domainMin, other.m_domainMax);
+    }
+
     void inverse()
     {
         std::swap(m_rangeMin, m_domainMin);
@@ -70,6 +85,13 @@ public:
         return (value - Scale<T>::m_domainMin) * m_transformSlope + Scale<T>::m_rangeMin;
     }
 
+    T slope() const { return m_transformSlope; }
+
+    T offset() const
+    {
+        return Scale<T>::m_rangeMin - Scale<T>::m_domainMin * m_transformSlope;
+    }
+
 protected:
     virtual void valuesUpdated()
     {
-- 
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