From 029b75793daab1a9a3c4cf86a553cfc7bfb00a17 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C3=89milie=20Feral?= <emilie.feral@numworks.com>
Date: Tue, 3 Jan 2017 11:39:14 +0100
Subject: [PATCH] [apps/regression] In graph view, display a specific legend
 when the mean dot is selected

Change-Id: Ib55101435c1205709ea5a17616e7daa09ae388bc
---
 apps/regression/banner_view.cpp | 17 +++++++++++++----
 apps/regression/data.cpp        |  4 ++++
 apps/regression/data.h          |  3 +++
 3 files changed, 20 insertions(+), 4 deletions(-)

diff --git a/apps/regression/banner_view.cpp b/apps/regression/banner_view.cpp
index 1ec0afbc8..3d2e0a4fd 100644
--- a/apps/regression/banner_view.cpp
+++ b/apps/regression/banner_view.cpp
@@ -20,30 +20,39 @@ void BannerView::reload() {
   m_regressionTypeView.setText("y = ax+b");
   char buffer[k_maxNumberOfCharacters];
   const char * legend = "a = ";
+  float slope = m_data->slope();
   int legendLength = strlen(legend);
   strlcpy(buffer, legend, legendLength+1);
-  float slope = m_data->slope();
   Float(slope).convertFloatToText(buffer+legendLength, Constant::FloatBufferSizeInScientificMode, Constant::NumberOfDigitsInMantissaInScientificMode);
   m_slopeView.setText(buffer);
 
   legend = "b = ";
+  float yIntercept = m_data->yIntercept();
   legendLength = strlen(legend);
   strlcpy(buffer, legend, legendLength+1);
-  float yIntercept = m_data->yIntercept();
   Float(yIntercept).convertFloatToText(buffer+legendLength, Constant::FloatBufferSizeInScientificMode, Constant::NumberOfDigitsInMantissaInScientificMode);
   m_yInterceptView.setText(buffer);
 
   legend = "x = ";
+  float x = m_data->xCursorPosition();
+  // Display a specific legend if the mean dot is selected
+  if (m_data->selectedDotIndex() == m_data->numberOfPairs()) {
+    legend = "x^ = ";
+    x = m_data->xMean();
+  }
   legendLength = strlen(legend);
   strlcpy(buffer, legend, legendLength+1);
-  float x = m_data->xCursorPosition();
   Float(x).convertFloatToText(buffer+legendLength, Constant::FloatBufferSizeInScientificMode, Constant::NumberOfDigitsInMantissaInScientificMode);
   m_xView.setText(buffer);
 
   legend = "y = ";
+  float y = m_data->yCursorPosition();
+  if (m_data->selectedDotIndex() == m_data->numberOfPairs()) {
+    legend = "y^ = ";
+    y = m_data->yMean();
+  }
   legendLength = strlen(legend);
   strlcpy(buffer, legend, legendLength+1);
-  float y = m_data->yCursorPosition();
   Float(y).convertFloatToText(buffer+legendLength, Constant::FloatBufferSizeInScientificMode, Constant::NumberOfDigitsInMantissaInScientificMode);
   m_yView.setText(buffer);
 }
diff --git a/apps/regression/data.cpp b/apps/regression/data.cpp
index 5c390e46f..67d4235d8 100644
--- a/apps/regression/data.cpp
+++ b/apps/regression/data.cpp
@@ -103,6 +103,10 @@ int Data::moveCursorHorizontally(int direction) {
   return windowHasMoved;
 }
 
+int Data::selectedDotIndex() {
+  return m_selectedDotIndex;
+}
+
 /* Window */
 
 void Data::setDefault() {
diff --git a/apps/regression/data.h b/apps/regression/data.h
index 773d6b9e3..f8b4731d4 100644
--- a/apps/regression/data.h
+++ b/apps/regression/data.h
@@ -24,6 +24,9 @@ public:
   // the result of moveCursorVertically means:
   // 0-> the window has not changed  1->the window changed
   int moveCursorVertically(int direction) override;
+  /* The selectedDotIndex is -1 when no dot is selected, m_numberOfPairs when
+   * the mean dot is selected and the dot index otherwise */
+  int selectedDotIndex();
 
   // Window
   void setDefault();