day2 - exercises 1 & 2

exercise/01/color.cpp

@@ -0,0 +1,73 @@
+#include "color.h"
+#include <algorithm>
+
+const double color::min_color_allowed_value = 0.;
+const double color::max_color_allowed_value = 1.;
+
+color::color(double red, double green, double blue)
+{
+  m_red = std::clamp(red, min_color_allowed_value, max_color_allowed_value);
+  m_green = std::clamp(green, min_color_allowed_value, max_color_allowed_value);
+  m_blue = std::clamp(blue, min_color_allowed_value, max_color_allowed_value);
+}
+
+color& color::operator=(color const& other)
+{
+  m_red = other.m_red;
+  m_green = other.m_green;
+  m_blue = other.m_blue;
+  return *this;
+}
+
+bool color::operator==(color const& other) const
+{
+  return m_red == other.m_red && m_green == other.m_green && m_blue == other.m_blue;
+}
+
+double color::get_red() const
+{
+  return m_red;
+}
+
+double color::get_green() const
+{
+  return m_green;
+}
+
+double color::get_blue() const
+{
+  return m_blue;
+}
+
+void color::set_red(double red)
+{
+  m_red = std::clamp(red, min_color_allowed_value, max_color_allowed_value);
+}
+
+void color::set_green(double green)
+{
+  m_green = std::clamp(green, min_color_allowed_value, max_color_allowed_value);
+}
+
+void color::set_blue(double blue)
+{
+  m_blue = std::clamp(blue, min_color_allowed_value, max_color_allowed_value);
+}
+
+COLORREF color::get_color_ref() const
+{
+  return RGB(static_cast<unsigned char>(m_red * 255), static_cast<unsigned char>(m_green * 255), static_cast<unsigned char>(m_blue * 255));
+}
+
+double color::get_luminance() const
+{
+  // magic constants
+  return 0.2126 * m_red + 0.7152 * m_green + 0.0722 * m_blue;
+
+}
+
+
+
+
+
+

exercise/01/color.h

@@ -0,0 +1,35 @@
+#pragma once
+#include <windows.h> // RGB
+
+class color
+{
+public:
+  explicit color(double red=0., double green=0., double blue=0.);
+  color(color const&) = default;
+  color& operator=(color const&);
+
+  ~color() = default;
+
+
+  bool operator==(color const&) const;
+
+
+  double get_red() const;
+  double get_green() const;
+  double get_blue() const;
+
+  void set_red(double red);
+  void set_green(double green);
+  void set_blue(double blue);
+
+  COLORREF get_color_ref() const;
+  double get_luminance() const;
+
+private:
+  double m_red;
+  double m_green;
+  double m_blue;
+
+  static const double min_color_allowed_value;
+  static const double max_color_allowed_value;
+};