diff --git a/apps/graph/values/interval.cpp b/apps/graph/values/interval.cpp
index 7b86d2148..46da19820 100644
--- a/apps/graph/values/interval.cpp
+++ b/apps/graph/values/interval.cpp
@@ -23,4 +23,28 @@ float Interval::element(int i) {
   return m_start + i*m_step;
 }
 
+float Interval::start() {
+  return m_start;
+}
+
+float Interval::end() {
+  return m_end;
+}
+
+float Interval::step() {
+  return m_step;
+}
+
+void Interval::setStart(float f) {
+  m_start = f;
+}
+
+void Interval::setEnd(float f) {
+  m_end = f;
+}
+
+void Interval::setStep(float f) {
+  m_step = f;
+}
+
 }
diff --git a/apps/graph/values/interval.h b/apps/graph/values/interval.h
index 68d3a0c77..7bc7f84b3 100644
--- a/apps/graph/values/interval.h
+++ b/apps/graph/values/interval.h
@@ -9,6 +9,13 @@ public:
 
   int numberOfElements();
   float element(int i);
+  float start();
+  float end();
+  float step();
+  void setStart(float f);
+  void setEnd(float f);
+  void setStep(float f);
+
 private:
   float m_start;
   float m_end;