[apps//regression] Create a graph view

Change-Id: I434e3647f7acf7b1358203f894d5847b787a2375

apps/regression/Makefile

@@ -4,6 +4,7 @@ app_objs += $(addprefix apps/regression/,\
   calculation_controller.o\
   data.o\
   graph_controller.o\
+  graph_view.o\
 )
 
 app_images += apps/regression/regression_icon.png

apps/regression/graph_view.cpp

@@ -0,0 +1,56 @@
+#include "graph_view.h"
+#include <assert.h>
+#include <math.h>
+
+namespace Regression {
+
+GraphView::GraphView(Data * data) :
+  CurveViewWithBanner(data, 0.2f, 0.2f, 0.4f, 0.2f),
+  m_data(data),
+  m_bannerView(BannerView(data))
+{
+}
+
+void GraphView::reloadSelection() {
+  float pixelXSelection = roundf(floatToPixel(Axis::Horizontal, m_data->xCursorPosition()));
+  float pixelYSelection = roundf(floatToPixel(Axis::Vertical, m_data->yCursorPosition()));
+  KDRect dirtyZone(KDRect(pixelXSelection - k_dotSize/2, pixelYSelection - k_dotSize/2, k_dotSize, k_dotSize));
+  markRectAsDirty(dirtyZone);
+  m_bannerView.reload();
+}
+
+void GraphView::reload() {
+  markRectAsDirty(bounds());
+  computeLabels(Axis::Horizontal);
+  computeLabels(Axis::Vertical);
+  m_bannerView.reload();
+}
+
+void GraphView::drawRect(KDContext * ctx, KDRect rect) const {
+  ctx->fillRect(rect, KDColorWhite);
+  drawAxes(ctx, rect, Axis::Horizontal);
+  drawAxes(ctx, rect, Axis::Vertical);
+  drawLabels(ctx, rect, Axis::Horizontal, true);
+  drawLabels(ctx, rect, Axis::Vertical, true);
+  drawCurve(ctx, rect, nullptr, KDColorRed);
+  for (int index = 0; index < m_data->numberOfPairs(); index++) {
+    drawDot(ctx, rect, m_data->xValueAtIndex(index), m_data->yValueAtIndex(index), KDColorBlue, KDSize(k_dotSize, k_dotSize));
+  }
+}
+
+char * GraphView::label(Axis axis, int index) const {
+  if (axis == Axis::Vertical) {
+    return (char *)m_yLabels[index];
+  }
+  return (char *)m_xLabels[index];
+}
+
+View * GraphView::bannerView() {
+  return &m_bannerView;
+}
+
+float GraphView::evaluateModelWithParameter(Model * curve, float t) const {
+  return m_data->yValueForXValue(t);
+}
+
+}

apps/regression/graph_view.h

@@ -0,0 +1,32 @@
+#ifndef REGRESSION_GRAPH_VIEW_H
+#define REGRESSION_GRAPH_VIEW_H
+
+#include <escher.h>
+#include "data.h"
+#include "banner_view.h"
+#include "../constant.h"
+#include "../curve_view_with_banner.h"
+
+namespace Regression {
+
+class GraphView : public CurveViewWithBanner {
+public:
+  GraphView(Data * m_data);
+  void reloadSelection() override;
+  void reload();
+  void drawRect(KDContext * ctx, KDRect rect) const override;
+private:
+  constexpr static KDCoordinate k_dotSize = 4;
+  char * label(Axis axis, int index) const override;
+  View * bannerView() override;
+  float evaluateModelWithParameter(Model * curve, float t) const override;
+  Data * m_data;
+  char m_xLabels[k_maxNumberOfXLabels][Constant::FloatBufferSizeInScientificMode];
+  char m_yLabels[k_maxNumberOfYLabels][Constant::FloatBufferSizeInScientificMode];
+  BannerView m_bannerView;
+};
+
+}
+
+
+#endif