diff --git a/apps/regression/graph_controller.cpp b/apps/regression/graph_controller.cpp
index 7ce45e16b..7cae98b09 100644
--- a/apps/regression/graph_controller.cpp
+++ b/apps/regression/graph_controller.cpp
@@ -256,43 +256,37 @@ bool GraphController::moveCursorHorizontally(int direction) {
   }
   double x = direction > 0 ? m_cursor->x() + m_store->xGridUnit()/k_numberOfCursorStepsInGradUnit :
     m_cursor->x() - m_store->xGridUnit()/k_numberOfCursorStepsInGradUnit;
-  double y = m_store->yValueForXValue(*m_selectedSeriesIndex, x, globalContext());
+  double y = yValue(*m_selectedSeriesIndex, x, globalContext());
   m_cursor->moveTo(x, y);
   m_store->panToMakePointVisible(x, y, cursorTopMarginRatio(), k_cursorRightMarginRatio, cursorBottomMarginRatio(), k_cursorLeftMarginRatio);
   return true;
 }
 
 bool GraphController::moveCursorVertically(int direction) {
-  int closestRegressionSeries = -1;
+  Poincare::Context * context = globalContext();
+  double x = m_cursor->x();
+  double y = m_cursor->y();
+
+  // Find the closest regression
+  int selectedRegressionIndex = *m_selectedDotIndex == -1 ? *m_selectedSeriesIndex : -1;
+  int closestRegressionSeries = InteractiveCurveViewController::closestCurveIndexVertically(direction > 0, selectedRegressionIndex, context);
+
+  // Find the closest dot
   int closestDotSeries = -1;
-  int dotSelected = -1;
-  Poincare::Context * globContext = globalContext();
-
-  if (*m_selectedDotIndex == -1) {
-    // The current cursor is on a regression
-    // Check the closest regression
-    closestRegressionSeries = m_store->closestVerticalRegression(direction, m_cursor->x(), m_cursor->y(), *m_selectedSeriesIndex, globContext);
-    // Check the closest dot
-    dotSelected = m_store->closestVerticalDot(direction, m_cursor->x(), direction > 0 ? -FLT_MAX : FLT_MAX, *m_selectedSeriesIndex, *m_selectedDotIndex, &closestDotSeries, globContext);
-  } else {
-    // The current cursor is on a dot
-    // Check the closest regression
-    closestRegressionSeries = m_store->closestVerticalRegression(direction, m_cursor->x(), m_cursor->y(), -1, globContext);
-    // Check the closest dot
-    dotSelected = m_store->closestVerticalDot(direction, m_cursor->x(), m_cursor->y(), *m_selectedSeriesIndex, *m_selectedDotIndex, &closestDotSeries, globContext);
-  }
+  double selectedDotY = *m_selectedDotIndex == -1 ? (direction > 0 ? -DBL_MAX : DBL_MAX) : y;
+  int dotSelected = m_store->closestVerticalDot(direction, x, selectedDotY, *m_selectedSeriesIndex, *m_selectedDotIndex, &closestDotSeries, context);
 
+  // Choose between selecting the regression or the dot
   bool validRegression = closestRegressionSeries > -1;
   bool validDot = dotSelected >= 0 && dotSelected <= m_store->numberOfPairsOfSeries(closestDotSeries);
-
   if (validRegression && validDot) {
     /* Compare the abscissa distances to select either the dot or the
      * regression. If they are equal, compare the ordinate distances. */
     double dotDistanceX = -1;
     if (dotSelected == m_store->numberOfPairsOfSeries(closestDotSeries)) {
-      dotDistanceX = std::fabs(m_store->meanOfColumn(closestDotSeries, 0) - m_cursor->x());
+      dotDistanceX = std::fabs(m_store->meanOfColumn(closestDotSeries, 0) - x);
     } else {
-      dotDistanceX = std::fabs(m_store->get(closestDotSeries, 0, dotSelected) - m_cursor->x());
+      dotDistanceX = std::fabs(m_store->get(closestDotSeries, 0, dotSelected) - x);
     }
     if (dotDistanceX != 0) {
       /* The regression X distance to the point is 0, so it is closer than the
@@ -300,12 +294,12 @@ bool GraphController::moveCursorVertically(int direction) {
       validDot = false;
     } else {
       // Compare the y distances
-      double regressionDistanceY = std::fabs(m_store->yValueForXValue(closestRegressionSeries, m_cursor->x(), globContext) - m_cursor->y());
+      double regressionDistanceY = std::fabs(yValue(closestRegressionSeries, x, context) - y);
       double dotDistanceY = -1;
       if (dotSelected == m_store->numberOfPairsOfSeries(closestDotSeries)) {
-        dotDistanceY = std::fabs(m_store->meanOfColumn(closestDotSeries, 1) - m_cursor->y());
+        dotDistanceY = std::fabs(m_store->meanOfColumn(closestDotSeries, 1) - y);
       } else {
-        dotDistanceY = std::fabs(m_store->get(closestDotSeries, 1, dotSelected) - m_cursor->y());
+        dotDistanceY = std::fabs(m_store->get(closestDotSeries, 1, dotSelected) - y);
       }
       if (regressionDistanceY <= dotDistanceY) {
         validDot = false;
@@ -314,28 +308,36 @@ bool GraphController::moveCursorVertically(int direction) {
       }
     }
   }
-  if (!validDot && validRegression) {
+
+  assert(!validDot || !validRegression);
+
+  if (validRegression) {
     // Select the regression
     *m_selectedSeriesIndex = closestRegressionSeries;
     selectRegressionCurve();
-    m_cursor->moveTo(m_cursor->x(), m_store->yValueForXValue(*m_selectedSeriesIndex, m_cursor->x(), globContext));
+    m_cursor->moveTo(x, yValue(*m_selectedSeriesIndex, x, context));
     m_store->panToMakePointVisible(m_cursor->x(), m_cursor->y(), cursorTopMarginRatio(), k_cursorRightMarginRatio, cursorBottomMarginRatio(), k_cursorLeftMarginRatio);
     return true;
   }
 
-  if (validDot && !validRegression) {
+  if (validDot) {
+    // Select the dot
     m_view.setCursorView(&m_crossCursorView);
     *m_selectedSeriesIndex = closestDotSeries;
     *m_selectedDotIndex = dotSelected;
     if (dotSelected == m_store->numberOfPairsOfSeries(*m_selectedSeriesIndex)) {
+      // Select the mean dot
       m_cursor->moveTo(m_store->meanOfColumn(*m_selectedSeriesIndex, 0), m_store->meanOfColumn(*m_selectedSeriesIndex, 1));
       m_store->panToMakePointVisible(m_cursor->x(), m_cursor->y(), cursorTopMarginRatio(), k_cursorRightMarginRatio, cursorBottomMarginRatio(), k_cursorLeftMarginRatio);
-      return true;
+    } else {
+      // Select a data point dot
+      m_cursor->moveTo(m_store->get(*m_selectedSeriesIndex, 0, *m_selectedDotIndex), m_store->get(*m_selectedSeriesIndex, 1, *m_selectedDotIndex));
+      m_store->panToMakePointVisible(m_cursor->x(), m_cursor->y(), cursorTopMarginRatio(), k_cursorRightMarginRatio, cursorBottomMarginRatio(), k_cursorLeftMarginRatio);
     }
-    m_cursor->moveTo(m_store->get(*m_selectedSeriesIndex, 0, *m_selectedDotIndex), m_store->get(*m_selectedSeriesIndex, 1, *m_selectedDotIndex));
-    m_store->panToMakePointVisible(m_cursor->x(), m_cursor->y(), cursorTopMarginRatio(), k_cursorRightMarginRatio, cursorBottomMarginRatio(), k_cursorLeftMarginRatio);
     return true;
   }
+
+  // There was no suitable selection
   return false;
 }
 
@@ -351,6 +353,22 @@ bool GraphController::isCursorVisible() {
   return interactiveCurveViewRange()->isCursorVisible(cursorTopMarginRatio(), k_cursorRightMarginRatio, cursorBottomMarginRatio(), k_cursorLeftMarginRatio);
 }
 
+bool GraphController::closestCurveIndexIsSuitable(int newIndex, int currentIndex) const {
+  return newIndex != currentIndex && !m_store->seriesIsEmpty(newIndex);
+}
+
+double GraphController::yValue(int curveIndex, double x, Poincare::Context * context) const {
+  return m_store->yValueForXValue(curveIndex, x, context);
+}
+
+bool GraphController::suitableYValue(double y) const {
+  return m_store->yMin() <= y && y <= m_store->yMax();
+}
+
+int GraphController::numberOfCurves() const {
+  return Store::k_numberOfSeries;
+}
+
 float GraphController::cursorBottomMarginRatio() {
   float f = (m_view.cursorView()->minimalSizeForOptimalDisplay().height()/2 + 2 + estimatedBannerHeight())/k_viewHeight;
   return f;
diff --git a/apps/regression/graph_controller.h b/apps/regression/graph_controller.h
index 1d02d8015..43a3505b7 100644
--- a/apps/regression/graph_controller.h
+++ b/apps/regression/graph_controller.h
@@ -28,29 +28,34 @@ private:
   constexpr static int k_maxLegendLength = 16;
   constexpr static int k_maxNumberOfCharacters = 50;
   constexpr static float k_viewHeight = 174.0f;
+
   Poincare::Context * globalContext();
-  Shared::CurveView * curveView() override;
-  Shared::InteractiveCurveViewRange * interactiveCurveViewRange() override;
-  bool handleEnter() override;
-  void reloadBannerView() override;
-  void initRangeParameters() override;
-  void initCursorParameters() override;
-  bool moveCursorHorizontally(int direction) override;
-  bool moveCursorVertically(int direction) override;
-  uint32_t modelVersion() override;
-  uint32_t rangeVersion() override;
-  bool isCursorVisible() override;
-
-  // InteractiveCurveViewController
-  float displayTopMarginRatio() override;
-  float displayBottomMarginRatio() override;
-
   float cursorTopMarginRatio() { return 0.07f; } // (cursorHeight/2) / graphViewHeight
   float cursorBottomMarginRatio();
   float estimatedBannerHeight() const;
 
+  // SimpleInteractiveCurveViewController
+  void reloadBannerView() override;
+  bool moveCursorHorizontally(int direction) override;
+  Shared::InteractiveCurveViewRange * interactiveCurveViewRange() override;
+  Shared::CurveView * curveView() override;
+  bool handleEnter() override;
+
+  // InteractiveCurveViewController
+  void initRangeParameters() override;
+  void initCursorParameters() override;
+  bool moveCursorVertically(int direction) override;
+  uint32_t modelVersion() override;
+  uint32_t rangeVersion() override;
+  bool isCursorVisible() override;
+  bool closestCurveIndexIsSuitable(int newIndex, int currentIndex) const override;
+  double yValue(int curveIndex, double x, Poincare::Context * context) const override;
+  bool suitableYValue(double y) const override;
+  int numberOfCurves() const override;
+
   // InteractiveCurveViewRangeDelegate
-  Shared::InteractiveCurveViewRangeDelegate::Range computeYRange(Shared::InteractiveCurveViewRange * interactiveCurveViewRange) override;
+  float displayTopMarginRatio() override;
+  float displayBottomMarginRatio() override;  Shared::InteractiveCurveViewRangeDelegate::Range computeYRange(Shared::InteractiveCurveViewRange * interactiveCurveViewRange) override;
 
   Shared::CursorView m_crossCursorView;
   Shared::RoundCursorView m_roundCursorView;
diff --git a/apps/regression/store.cpp b/apps/regression/store.cpp
index fcbee5b78..072eca522 100644
--- a/apps/regression/store.cpp
+++ b/apps/regression/store.cpp
@@ -43,56 +43,6 @@ void Store::setSeriesRegressionType(int series, Model::Type type) {
   }
 }
 
-int Store::closestVerticalRegression(int direction, double x, double y, int currentRegressionSeries, Poincare::Context * globalContext) {
-  /* The conditions to test on all the regressions are in this order:
-   * - the current regression is not the current regression
-   * - the next regression point should be within the window abscissa bounds
-   * - it is the closest one in abscissa to x
-   * - it is above y if direction > 0 and below otherwise */
-
-  int nextRegressionSeries = -1;
-  float nextY = direction > 0 ? FLT_MAX : -FLT_MAX;
-
-  for (int i = 0; i < k_numberOfSeries; i ++) {
-    if (i == currentRegressionSeries || seriesIsEmpty(i)) {
-      continue;
-    }
-    double newY = yValueForXValue(i, x, globalContext);
-    if (newY < m_yMin || newY > m_yMax) {
-      continue;
-    }
-    bool isNextRegression = false;
-    /* Choosing the next regression to select quite complex because we need to
-     * take care of regressions that have the same values at the current x. When
-     * moving up, if several regressions have the same value, we select the
-     * regression of higher index. When going down, we select the regression of
-     * lower index. */
-    if (direction > 0) {
-      if (newY > y && newY < nextY) {
-        isNextRegression = true;
-      } else if (newY == nextY) {
-        assert(i > nextRegressionSeries);
-        isNextRegression = true;
-      } else if (newY == y && i < currentRegressionSeries) {
-        isNextRegression = true;
-      }
-    } else {
-      if (newY < y && newY > nextY) {
-        isNextRegression = true;
-      } else if (newY == nextY) {
-        assert(i > nextRegressionSeries);
-      } else if (newY == y && i > currentRegressionSeries) {
-        isNextRegression = true;
-      }
-    }
-    if (isNextRegression) {
-      nextY = newY;
-      nextRegressionSeries = i;
-    }
-  }
-  return nextRegressionSeries;
-}
-
 /* Dots */
 
 int Store::closestVerticalDot(int direction, double x, double y, int currentSeries, int currentDot, int * nextSeries, Poincare::Context * globalContext) {
diff --git a/apps/regression/store.h b/apps/regression/store.h
index 81e5350bc..a5acc58b6 100644
--- a/apps/regression/store.h
+++ b/apps/regression/store.h
@@ -35,9 +35,7 @@ public:
     assert((int)m_regressionTypes[series] >= 0 && (int)m_regressionTypes[series] < Model::k_numberOfModels);
     return regressionModel((int)m_regressionTypes[series]);
   }
-  /* Return the series index of the closest regression at abscissa x, above
-   * ordinate y if direction > 0, below otherwise */
-  int closestVerticalRegression(int direction, double x, double y, int currentRegressionSeries, Poincare::Context * globalContext);
+
   // Dots
   /* Return the closest dot to abscissa x above the regression curve if
    * direction > 0, below otherwise */
diff --git a/apps/shared/interactive_curve_view_controller.cpp b/apps/shared/interactive_curve_view_controller.cpp
index d5a2e8083..d46d8f1c8 100644
--- a/apps/shared/interactive_curve_view_controller.cpp
+++ b/apps/shared/interactive_curve_view_controller.cpp
@@ -1,6 +1,7 @@
 #include "interactive_curve_view_controller.h"
 #include "text_field_delegate_app.h"
 #include <cmath>
+#include <float.h>
 #include <assert.h>
 
 using namespace Poincare;
@@ -161,4 +162,49 @@ StackViewController * InteractiveCurveViewController::stackController() const{
   return (StackViewController *)(parentResponder()->parentResponder()->parentResponder());
 }
 
+int InteractiveCurveViewController::closestCurveIndexVertically(bool goingUp, int currentCurveIndex, Poincare::Context * context) const {
+  double x = m_cursor->x();
+  double y = m_cursor->y();
+  double nextY = goingUp ? DBL_MAX : -DBL_MAX;
+  int nextCurveIndex = -1;
+  int curvesCount = numberOfCurves();
+  for (int i = 0; i < curvesCount; i++) {
+    if (!closestCurveIndexIsSuitable(i, currentCurveIndex)) {
+      continue;
+    }
+    double newY = yValue(i, x, context);
+    if (!suitableYValue(newY)) {
+      continue;
+    }
+    bool isNextCurve = false;
+    /* Choosing the closest vertical curve is quite complex because we need to
+     * take care of curves that have the same values at the current x. When
+     * moving up, if several curves have the same value, we choose the curve
+     * of higher index. When going down, we select the curve of lower index. */
+    if (goingUp) {
+      if (newY > y && newY < nextY) {
+        isNextCurve = true;
+      } else if (newY == nextY) {
+        assert(i > nextCurveIndex);
+        isNextCurve = true;
+      } else if (newY == y && i < currentCurveIndex) {
+        isNextCurve = true;
+      }
+    } else {
+      if (newY < y && newY > nextY) {
+        isNextCurve = true;
+      } else if (newY == nextY) {
+        assert(i > nextCurveIndex);
+      } else if (newY == y && i > currentCurveIndex) {
+        isNextCurve = true;
+      }
+    }
+    if (isNextCurve) {
+      nextY = newY;
+      nextCurveIndex = i;
+    }
+  }
+  return nextCurveIndex;
+}
+
 }
diff --git a/apps/shared/interactive_curve_view_controller.h b/apps/shared/interactive_curve_view_controller.h
index f992a50d0..27079c950 100644
--- a/apps/shared/interactive_curve_view_controller.h
+++ b/apps/shared/interactive_curve_view_controller.h
@@ -44,6 +44,14 @@ protected:
   virtual uint32_t modelVersion() = 0;
   virtual uint32_t rangeVersion() = 0;
   virtual bool isCursorVisible() = 0;
+
+  // Closest vertical curve helper
+  int closestCurveIndexVertically(bool goingUp, int currentSelectedCurve, Poincare::Context * context) const;
+  virtual bool closestCurveIndexIsSuitable(int newIndex, int currentIndex) const { assert(false); return false; }
+  virtual double yValue(int curveIndex, double x, Poincare::Context * context) const { assert(false); return 0; }
+  virtual bool suitableYValue(double y) const { return true; }
+  virtual int numberOfCurves() const { assert(false); return 0; }
+
   OkView m_okView;
 private:
   uint32_t * m_modelVersion;
diff --git a/apps/shared/storage_function_graph_controller.cpp b/apps/shared/storage_function_graph_controller.cpp
index 4c37b733e..9d8c7efac 100644
--- a/apps/shared/storage_function_graph_controller.cpp
+++ b/apps/shared/storage_function_graph_controller.cpp
@@ -119,6 +119,11 @@ double StorageFunctionGraphController::defaultCursorAbscissa() {
   return (interactiveCurveViewRange()->xMin()+interactiveCurveViewRange()->xMax())/2.0f;
 }
 
+StorageFunctionStore * StorageFunctionGraphController::functionStore() const {
+  StorageFunctionApp * myApp = static_cast<StorageFunctionApp *>(app());
+  return myApp->functionStore();
+}
+
 void StorageFunctionGraphController::initCursorParameters() {
   double x = defaultCursorAbscissa();
   StorageFunctionApp * myApp = static_cast<StorageFunctionApp *>(app());
@@ -136,50 +141,14 @@ void StorageFunctionGraphController::initCursorParameters() {
 
 bool StorageFunctionGraphController::moveCursorVertically(int direction) {
   int currentActiveFunctionIndex = indexFunctionSelectedByCursor();
-  StorageFunctionApp * myApp = static_cast<StorageFunctionApp *>(app());
-  double y = functionStore()->modelForRecord(functionStore()->activeRecordAtIndex(currentActiveFunctionIndex))->evaluateAtAbscissa(m_cursor->x(), myApp->localContext());
-  int nextActiveFunctionIndex = -1;
-  double nextY = direction > 0 ? DBL_MAX : -DBL_MAX;
-  int activeFunctionsCount = functionStore()->numberOfActiveFunctions();
-  for (int i = 0; i < activeFunctionsCount; i++) {
-    if (i == currentActiveFunctionIndex) {
-      continue;
-    }
-    double newY = functionStore()->modelForRecord(functionStore()->activeRecordAtIndex(i))->evaluateAtAbscissa(m_cursor->x(), myApp->localContext());
-    bool isNextFunction = false;
-    /* Choosing the next function to select quite complex because we need to
-     * take care of functions that have the same values at the current x. When
-     * moving up, if several functions have the same value, we select the
-     * function of higher index. When going down, we select the function of
-     * lower index. */
-    if (direction > 0) {
-      if (newY > y && newY < nextY) {
-        isNextFunction = true;
-      } else if (newY == nextY) {
-        assert(i > nextActiveFunctionIndex);
-        isNextFunction = true;
-      } else if (newY == y && i < currentActiveFunctionIndex) {
-        isNextFunction = true;
-      }
-    } else {
-      if (newY < y && newY > nextY) {
-        isNextFunction = true;
-      } else if (newY == nextY) {
-        assert(i > nextActiveFunctionIndex);
-      } else if (newY == y && i > currentActiveFunctionIndex) {
-        isNextFunction = true;
-      }
-    }
-    if (isNextFunction) {
-      nextY = newY;
-      nextActiveFunctionIndex = i;
-    }
-  }
+  Poincare::Context * context = static_cast<StorageFunctionApp *>(app())->localContext();
+
+  int nextActiveFunctionIndex = InteractiveCurveViewController::closestCurveIndexVertically(direction > 0, currentActiveFunctionIndex, context);
   if (nextActiveFunctionIndex < 0) {
     return false;
   }
   selectFunctionWithCursor(nextActiveFunctionIndex);
-  m_cursor->moveTo(m_cursor->x(), nextY);
+  m_cursor->moveTo(m_cursor->x(), yValue(nextActiveFunctionIndex, m_cursor->x(), context));
   interactiveCurveViewRange()->panToMakePointVisible(m_cursor->x(), m_cursor->y(), cursorTopMarginRatio(), k_cursorRightMarginRatio, cursorBottomMarginRatio(), k_cursorLeftMarginRatio);
   return true;
 }
@@ -200,9 +169,16 @@ bool StorageFunctionGraphController::isCursorVisible() {
   return interactiveCurveViewRange()->isCursorVisible(cursorTopMarginRatio(), k_cursorRightMarginRatio, cursorBottomMarginRatio(), k_cursorLeftMarginRatio);
 }
 
-StorageFunctionStore * StorageFunctionGraphController::functionStore() const {
-  StorageFunctionApp * myApp = static_cast<StorageFunctionApp *>(app());
-  return myApp->functionStore();
+bool StorageFunctionGraphController::closestCurveIndexIsSuitable(int newIndex, int currentIndex) const {
+  return newIndex != currentIndex;
+}
+
+double StorageFunctionGraphController::yValue(int curveIndex, double x, Poincare::Context * context) const {
+  return functionStore()->modelForRecord(functionStore()->activeRecordAtIndex(curveIndex))->evaluateAtAbscissa(x, context);
+}
+
+int StorageFunctionGraphController::numberOfCurves() const {
+  return functionStore()->numberOfActiveFunctions();
 }
 
 }
diff --git a/apps/shared/storage_function_graph_controller.h b/apps/shared/storage_function_graph_controller.h
index 000a98f27..6266f55f1 100644
--- a/apps/shared/storage_function_graph_controller.h
+++ b/apps/shared/storage_function_graph_controller.h
@@ -19,31 +19,34 @@ public:
   void viewWillAppear() override;
 
 protected:
-  float cursorTopMarginRatio() {
-    return 0.068f; // (cursorHeight/2)/graphViewHeight;
-  }
+  float cursorTopMarginRatio() { return 0.068f; } // (cursorHeight/2)/graphViewHeight
   float cursorBottomMarginRatio();
   void reloadBannerView() override;
   bool handleEnter() override;
-  int indexFunctionSelectedByCursor() const {
-    return *m_indexFunctionSelectedByCursor;
-  }
+  int indexFunctionSelectedByCursor() const { return *m_indexFunctionSelectedByCursor; }
   virtual void selectFunctionWithCursor(int functionIndex);
   virtual double defaultCursorAbscissa();
   virtual StorageFunctionStore * functionStore() const;
+
 private:
   constexpr static float k_viewHeight = 174.0f; // TODO Taken from Regresssion/graph_controller. Maybe we should compute and/or put in common ?
+
+  virtual StorageFunctionGraphView * functionGraphView() = 0;
+  virtual View * cursorView() = 0;
+  virtual StorageFunctionCurveParameterController * curveParameterController() = 0;
+
   // InteractiveCurveViewController
   /* When y auto is ticked, we use a display margin to be ensure that the user
    * can move the cursor along the curve without panning the window */
-  float displayTopMarginRatio() override {
-    return 0.09f; // cursorHeight/graphViewHeight
-  }
+  float displayTopMarginRatio() override { return 0.09f; } // cursorHeight/graphViewHeight
   float displayBottomMarginRatio() override;
+
   // InteractiveCurveViewRangeDelegate
   InteractiveCurveViewRangeDelegate::Range computeYRange(InteractiveCurveViewRange * interactiveCurveViewRange) override;
   float estimatedBannerHeight() const;
   virtual int estimatedBannerNumberOfLines() const { return 1; }
+
+  // InteractiveCurveViewController
   void initRangeParameters() override;
   void initCursorParameters() override;
   bool moveCursorVertically(int direction) override;
@@ -51,9 +54,10 @@ private:
   uint32_t modelVersion() override;
   uint32_t rangeVersion() override;
   bool isCursorVisible() override;
-  virtual StorageFunctionGraphView * functionGraphView() = 0;
-  virtual View * cursorView() = 0;
-  virtual StorageFunctionCurveParameterController * curveParameterController() = 0;
+  bool closestCurveIndexIsSuitable(int newIndex, int currentIndex) const override;
+  double yValue(int curveIndex, double x, Poincare::Context * context) const override;
+  int numberOfCurves() const override;
+
   InitialisationParameterController m_initialisationParameterController;
   Poincare::Preferences::AngleUnit * m_angleUnitVersion;
   int * m_indexFunctionSelectedByCursor;