[apps/statistics] Add a bin width variable in data model

Change-Id: Ie64230acdcb618e8c01f99da03f06801ab9c4152

apps/statistics/data.cpp

@@ -4,7 +4,8 @@
 namespace Statistics {
 
 Data::Data() :
-  m_numberOfPairs(0)
+  m_numberOfPairs(0),
+  m_binWidth(1.0f)
 {
 }
 
@@ -12,6 +13,10 @@ int Data::numberOfPairs() const {
   return m_numberOfPairs;
 }
 
+float Data::binWidth() {
+  return m_binWidth;
+}
+
 float Data::valueAtIndex(int index) {
   return m_values[index];
 }
@@ -77,7 +82,7 @@ float Data::xMax() {
   if (valueMax - valueMin >  k_maxRangeValue) {
     valueMax = valueMin + 10.0f;
   }
-  return valueMax;
+  return valueMax + binWidth();
 }
 
 float Data::yMin() {

apps/statistics/data.h

@@ -11,6 +11,7 @@ public:
   // Delete the implicit copy constructor: the object is heavy
   Data(const Data&) = delete;
   int numberOfPairs() const;
+  float binWidth();
   float valueAtIndex(int index);
   int sizeAtIndex(int index);
   void setValueAtIndex(float value, int index);
@@ -30,6 +31,7 @@ private:
   int m_sizes[k_maxNumberOfPairs];
   float m_values[k_maxNumberOfPairs];
   int m_numberOfPairs;
+  float m_binWidth;
 };
 
 }