[apps/regression] Create a banner view class

Change-Id: I30ad498b2c63c1a7edb09a05c40dd1f94373ead1

apps/regression/Makefile

@@ -1,5 +1,6 @@
 app_objs += $(addprefix apps/regression/,\
   app.o\
+  banner_view.o\
   calculation_controller.o\
   data.o\
   graph_controller.o\

apps/regression/banner_view.cpp

@@ -0,0 +1,88 @@
+#include "banner_view.h"
+#include "../constant.h"
+#include <assert.h>
+#include <poincare.h>
+
+namespace Regression {
+
+BannerView::BannerView(Data * data) :
+  m_regressionTypeView(nullptr, 0.5f, 0.5f),
+  m_slopeView(0.5f, 0.5f),
+  m_yInterceptView(0.5f, 0.5f),
+  m_xView(0.5f, 0.5f),
+  m_yView(0.5f, 0.5f),
+  m_data(data)
+{
+}
+
+void BannerView::reload() {
+  markRectAsDirty(bounds());
+  m_regressionTypeView.setText("y = ax+b");
+  char buffer[k_maxNumberOfCharacters];
+  const char * legend = "a = ";
+  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 = ";
+  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 = ";
+  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 = ";
+  legendLength = strlen(legend);
+  strlcpy(buffer, legend, legendLength+1);
+  float y = m_data->yValueForXValue(x);
+  Float(y).convertFloatToText(buffer+legendLength, Constant::FloatBufferSizeInScientificMode, Constant::NumberOfDigitsInMantissaInScientificMode);
+  m_yView.setText(buffer);
+}
+
+void BannerView::drawRect(KDContext * ctx, KDRect rect) const {
+  ctx->fillRect(bounds(), KDColorWhite);
+}
+
+int BannerView::numberOfSubviews() const {
+  return 5;
+}
+
+View * BannerView::subviewAtIndex(int index) {
+  assert(index >= 0);
+  switch (index) {
+    case 0:
+      return &m_regressionTypeView;
+    case 1:
+      return &m_slopeView;
+    case 2:
+      return &m_yInterceptView;
+    case 3:
+      return &m_xView;
+    case 4:
+      return &m_yView;
+    default:
+      assert(false);
+      return nullptr;
+  }
+}
+
+void BannerView::layoutSubviews() {
+  KDCoordinate height = bounds().height();
+  KDCoordinate width = bounds().width();
+  m_regressionTypeView.setFrame(KDRect(0, 0, width/3, height/2));
+  m_slopeView.setFrame(KDRect(width/3, 0, width/3, height/2));
+  m_yInterceptView.setFrame(KDRect(2*width/3, 0, width/3, height/2));
+  m_xView.setFrame(KDRect(0, height/2, width/3, height/2));
+  m_yView.setFrame(KDRect(width/3, height/2, width/3, height/2));
+}
+
+}

apps/regression/banner_view.h

@@ -0,0 +1,29 @@
+#ifndef REGRESSION_BANNER_VIEW_H
+#define REGRESSION_BANNER_VIEW_H
+
+#include <escher.h>
+#include "data.h"
+
+namespace Regression {
+
+class BannerView : public View {
+public:
+  BannerView(Data * data);
+  void reload();
+  void drawRect(KDContext * ctx, KDRect rect) const override;
+private:
+  constexpr static int k_maxNumberOfCharacters = 50;
+  int numberOfSubviews() const override;
+  View * subviewAtIndex(int index) override;
+  void layoutSubviews() override;
+  PointerTextView m_regressionTypeView;
+  BufferTextView m_slopeView;
+  BufferTextView m_yInterceptView;
+  BufferTextView m_xView;
+  BufferTextView m_yView;
+  Data * m_data;
+};
+
+}
+
+#endif