[apps] class Extremum Graph Controller

apps/graph/graph/extremum_graph_controller.cpp

@@ -0,0 +1,97 @@
+#include "extremum_graph_controller.h"
+#include "../app.h"
+
+using namespace Shared;
+using namespace Poincare;
+
+namespace Graph {
+
+ExtremumGraphController::ExtremumGraphController(Responder * parentResponder, GraphView * graphView, BannerView * bannerView, Shared::InteractiveCurveViewRange * curveViewRange, CurveViewCursor * cursor, I18n::Message defaultMessage) :
+  ViewController(parentResponder),
+  m_graphView(graphView),
+  m_bannerView(bannerView),
+  m_graphRange(curveViewRange),
+  m_cursor(cursor),
+  m_function(nullptr),
+  m_defaultBannerView(KDText::FontSize::Small, defaultMessage, 0.5f, 0.5f, KDColorBlack, Palette::GreyMiddle),
+  m_isActive(false)
+{
+}
+
+View * ExtremumGraphController::view() {
+  return m_graphView;
+}
+
+void ExtremumGraphController::viewWillAppear() {
+  assert(m_function != nullptr);
+  CartesianFunction::Point p = computeExtremumBetweenBounds(m_graphRange->xMin(), m_graphRange->xMax());
+  if (std::isnan(p.abscissa)) {
+    m_isActive = false;
+    m_graphView->setCursorView(nullptr);
+    m_graphView->setBannerView(&m_defaultBannerView);
+  } else {
+    m_isActive = true;
+    m_cursor->moveTo(p.abscissa, p.value);
+    m_graphRange->panToMakePointVisible(m_cursor->x(), m_cursor->y(), k_cursorTopMarginRatio, SimpleInteractiveCurveViewController::k_cursorRightMarginRatio, k_cursorBottomMarginRatio, SimpleInteractiveCurveViewController::k_cursorLeftMarginRatio);
+    reloadBannerView();
+  }
+  m_graphView->setOkView(nullptr);
+  m_graphView->reload();
+}
+
+bool ExtremumGraphController::handleEvent(Ion::Events::Event event) {
+  if (event == Ion::Events::EXE || event == Ion::Events::OK) {
+    StackViewController * stack = static_cast<StackViewController *>(parentResponder());
+    stack->pop();
+    return true;
+  }
+  if (m_isActive && (event == Ion::Events::Right || event == Ion::Events::Left)) {
+    int direction = event == Ion::Events::Right ? 1 : -1;
+    if (moveCursor(direction)) {
+      reloadBannerView();
+      m_graphView->reload();
+      return true;
+    }
+  }
+  return false;
+}
+
+void ExtremumGraphController::setFunction(CartesianFunction * function) {
+  m_graphView->selectFunction(function);
+  m_function = function;
+}
+
+void ExtremumGraphController::reloadBannerView() {
+  m_bannerView->setNumberOfSubviews(2);
+  reloadBannerViewForCursorOnFunction(m_cursor, m_function, 'x');
+}
+
+bool ExtremumGraphController::moveCursor(int direction) {
+  double x = m_cursor->x();
+  float step = m_graphRange->xGridUnit()/SimpleInteractiveCurveViewController::k_numberOfCursorStepsInGradUnit;
+  float start = direction > 0 ? x+step : m_graphRange->xMin();
+  float end = direction > 0 ? m_graphRange->xMax() : x-step;
+  CartesianFunction::Point newExtremum = computeExtremumBetweenBounds(start, end);
+  if (std::isnan(newExtremum.abscissa)) {
+    return false;
+  }
+  m_cursor->moveTo(newExtremum.abscissa, newExtremum.value);
+  m_graphRange->panToMakePointVisible(m_cursor->x(), m_cursor->y(), k_cursorTopMarginRatio, SimpleInteractiveCurveViewController::k_cursorRightMarginRatio, k_cursorBottomMarginRatio, SimpleInteractiveCurveViewController::k_cursorLeftMarginRatio);
+  return true;
+}
+
+MinimumGraphController::MinimumGraphController(Responder * parentResponder, GraphView * graphView, BannerView * bannerView, Shared::InteractiveCurveViewRange * curveViewRange, Shared::CurveViewCursor * cursor) :
+  ExtremumGraphController(parentResponder, graphView, bannerView, curveViewRange, cursor, I18n::Message::NoMinimumFound)
+{
+}
+
+const char * MinimumGraphController::title() {
+  return I18n::translate(I18n::Message::Minimum);
+}
+
+CartesianFunction::Point MinimumGraphController::computeExtremumBetweenBounds(float start, float end) {
+  TextFieldDelegateApp * myApp = (TextFieldDelegateApp *)app();
+  return m_function->mininimumBetweenBounds(start, end, myApp->localContext());
+}
+
+}