From 37c3f6189d2b5cef32a8e6089a661886f79f0f5c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C3=89milie=20Feral?= <emilie.feral@numworks.com>
Date: Fri, 19 Jan 2018 17:19:45 +0100
Subject: [PATCH] [apps] Graph: create a RootGraphController

---
 apps/graph/Makefile                           |  1 +
 .../calculation_parameter_controller.cpp      |  7 +++++-
 .../graph/calculation_parameter_controller.h  |  2 ++
 apps/graph/graph/root_graph_controller.cpp    | 22 +++++++++++++++++++
 apps/graph/graph/root_graph_controller.h      | 18 +++++++++++++++
 5 files changed, 49 insertions(+), 1 deletion(-)
 create mode 100644 apps/graph/graph/root_graph_controller.cpp
 create mode 100644 apps/graph/graph/root_graph_controller.h

diff --git a/apps/graph/Makefile b/apps/graph/Makefile
index 8759bd5e8..fbda46dbd 100644
--- a/apps/graph/Makefile
+++ b/apps/graph/Makefile
@@ -16,6 +16,7 @@ app_objs += $(addprefix apps/graph/,\
   graph/graph_view.o\
   graph/integral_graph_controller.o\
   graph/tangent_graph_controller.o\
+  graph/root_graph_controller.o\
   list/list_controller.o\
   values/derivative_parameter_controller.o\
   values/function_parameter_controller.o\
diff --git a/apps/graph/graph/calculation_parameter_controller.cpp b/apps/graph/graph/calculation_parameter_controller.cpp
index dfdfed960..2d1bed7d3 100644
--- a/apps/graph/graph/calculation_parameter_controller.cpp
+++ b/apps/graph/graph/calculation_parameter_controller.cpp
@@ -15,7 +15,8 @@ CalculationParameterController::CalculationParameterController(Responder * paren
   m_tangentGraphController(nullptr, graphView, bannerView, range, cursor),
   m_integralGraphController(nullptr, graphView, range, cursor),
   m_minimumGraphController(nullptr, graphView, bannerView, range, cursor),
-  m_maximumGraphController(nullptr, graphView, bannerView, range, cursor)
+  m_maximumGraphController(nullptr, graphView, bannerView, range, cursor),
+  m_rootGraphController(nullptr, graphView, bannerView, range, cursor)
 {
 }
 
@@ -44,6 +45,10 @@ bool CalculationParameterController::handleEvent(Ion::Events::Event event) {
         m_minimumGraphController.setFunction(m_function);
         controller = &m_minimumGraphController;
         break;
+      case 3:
+        m_rootGraphController.setFunction(m_function);
+        controller = &m_rootGraphController;
+        break;
       case 4:
         m_tangentGraphController.setFunction(m_function);
         controller = &m_tangentGraphController;
diff --git a/apps/graph/graph/calculation_parameter_controller.h b/apps/graph/graph/calculation_parameter_controller.h
index 02031605a..7a3a41bba 100644
--- a/apps/graph/graph/calculation_parameter_controller.h
+++ b/apps/graph/graph/calculation_parameter_controller.h
@@ -6,6 +6,7 @@
 #include "tangent_graph_controller.h"
 #include "extremum_graph_controller.h"
 #include "integral_graph_controller.h"
+#include "root_graph_controller.h"
 #include "graph_view.h"
 #include "banner_view.h"
 #include "../../i18n.h"
@@ -34,6 +35,7 @@ private:
   IntegralGraphController m_integralGraphController;
   MinimumGraphController m_minimumGraphController;
   MaximumGraphController m_maximumGraphController;
+  RootGraphController m_rootGraphController;
 };
 
 }
diff --git a/apps/graph/graph/root_graph_controller.cpp b/apps/graph/graph/root_graph_controller.cpp
new file mode 100644
index 000000000..ec1d379ff
--- /dev/null
+++ b/apps/graph/graph/root_graph_controller.cpp
@@ -0,0 +1,22 @@
+#include "root_graph_controller.h"
+#include "../app.h"
+
+using namespace Shared;
+using namespace Poincare;
+
+namespace Graph {
+
+RootGraphController::RootGraphController(Responder * parentResponder, GraphView * graphView, BannerView * bannerView, Shared::InteractiveCurveViewRange * curveViewRange, CurveViewCursor * cursor) :
+  CalculationGraphController(parentResponder, graphView, bannerView, curveViewRange, cursor, I18n::Message::NoZeroFound)
+{
+}
+
+const char * RootGraphController::title() {
+  return I18n::translate(I18n::Message::Zeros);
+}
+
+CartesianFunction::Point RootGraphController::computeNewPointOfInterest(double start, double step, double max, Context * context) {
+  return {.abscissa = m_function->nextRootFrom(start, step, max, context), .value = 0.0};
+}
+
+}
diff --git a/apps/graph/graph/root_graph_controller.h b/apps/graph/graph/root_graph_controller.h
new file mode 100644
index 000000000..2d53898e7
--- /dev/null
+++ b/apps/graph/graph/root_graph_controller.h
@@ -0,0 +1,18 @@
+#ifndef GRAPH_ROOT_GRAPH_CONTROLLER_H
+#define GRAPH_ROOT_GRAPH_CONTROLLER_H
+
+#include "calculation_graph_controller.h"
+
+namespace Graph {
+
+class RootGraphController : public CalculationGraphController {
+public:
+  RootGraphController(Responder * parentResponder, GraphView * graphView, BannerView * bannerView, Shared::InteractiveCurveViewRange * curveViewRange, Shared::CurveViewCursor * cursor);
+  const char * title() override;
+private:
+  CartesianFunction::Point computeNewPointOfInterest(double start, double step, double max, Poincare::Context * context) override;
+};
+
+}
+
+#endif