(C++) LedWidget

 

 

LedWidget is a Led widget.

Technical facts

 

 

 

 

 

 

./CppLedWidget/CppLedWidget.pri

 

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INCLUDEPATH += \     ../../Classes/CppLedWidget SOURCES += \     ../../Classes/CppLedWidget/ledwidget.cpp HEADERS  += \     ../../Classes/CppLedWidget/ledwidget.h OTHER_FILES += \     ../../Classes/CppLedWidget/Licence.txt

 

 

 

 

 

./CppLedWidget/ledwidget.h

 

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//--------------------------------------------------------------------------- /* LedWidget, Widget for the Led class Copyright 2011-2015 Richel Bilderbeek This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>. */ //--------------------------------------------------------------------------- //From http://www.richelbilderbeek.nl/CppLedWidget.htm //--------------------------------------------------------------------------- #ifndef LEDWIDGET_H #define LEDWIDGET_H #pragma GCC diagnostic push #pragma GCC diagnostic ignored "-Wunused-local-typedefs" #include <boost/scoped_ptr.hpp> #include <boost/signals2.hpp> #include "widget.h" #pragma GCC diagnostic pop namespace ribi { struct Led; struct TextCanvas; ///Widget for displaying a Led struct LedWidget : public Widget {   explicit LedWidget(     const int x = 0,     const int y = 0,     const int width = 100,     const int height = 100,     const double intensity    = 0.0,     const unsigned char red   = 255,     const unsigned char green =   0,     const unsigned char blue  =   0   );   LedWidget(const LedWidget&) = delete;   LedWidget& operator=(const LedWidget&) = delete;   ~LedWidget() noexcept;   ///Obtain a read-only pointer to Led   const Led * GetLed() const noexcept { return m_led.get(); }   ///Obtain a read-and-write pointer to Led   Led * GetLed() noexcept { return m_led.get(); }   ///Obtain the version of this class   static std::string GetVersion() noexcept;   ///Obtain the version history of this class   static std::vector<std::string> GetVersionHistory() noexcept;   #ifndef NDEBUG   static void Test() noexcept;   #endif   const boost::shared_ptr<TextCanvas> ToCanvas(const int radius) const noexcept;   private:   ///The LED   boost::scoped_ptr<Led> m_led;   friend std::ostream& operator<<(std::ostream& os, const LedWidget& widget) noexcept; }; std::ostream& operator<<(std::ostream& os, const LedWidget& widget) noexcept; } //~namespace ribi #endif // LEDWIDGET_H

 

 

 

 

 

./CppLedWidget/ledwidget.cpp

 

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//--------------------------------------------------------------------------- /* LedWidget, Widget for the Led class Copyright 2011-2015 Richel Bilderbeek This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>. */ //--------------------------------------------------------------------------- //From http://www.richelbilderbeek.nl/CppLedWidget.htm //--------------------------------------------------------------------------- #pragma GCC diagnostic push #pragma GCC diagnostic ignored "-Weffc++" #pragma GCC diagnostic ignored "-Wunused-local-typedefs" #include "ledwidget.h" #include <iostream> #include <boost/math/constants/constants.hpp> #include "led.h" #include "testtimer.h" #include "textcanvas.h" #include "trace.h" #pragma GCC diagnostic pop ribi::LedWidget::LedWidget(   const int x,   const int y,   const int width,   const int height,   const double intensity,   const unsigned char red,   const unsigned char green,   const unsigned char blue)   : m_led(new Led(intensity,red,green,blue)) {   #ifndef NDEBUG   Test();   #endif   this->SetGeometry(x,y,width,height); } ribi::LedWidget::~LedWidget() noexcept {   //OK } std::string ribi::LedWidget::GetVersion() noexcept {   return "1.4"; } std::vector<std::string> ribi::LedWidget::GetVersionHistory() noexcept {   return {     "2011-07-03: version 1.0: initial version",     "2011-08-17: Version 1.1: emit a signal when the color is changed",     "2011-08-20: Version 1.2: added operator<<",     "2011-09-08: Version 1.3: removed redundant signals",     "2014-03-28: Version 1.4: replaced custom Rect class by Boost.Geometry"   }; } #ifndef NDEBUG void ribi::LedWidget::Test() noexcept {   {     static bool is_tested{false};     if (is_tested) return;     is_tested = true;   }   const TestTimer test_timer(__func__,__FILE__,1.0); } #endif const boost::shared_ptr<ribi::TextCanvas> ribi::LedWidget::ToCanvas(const int radius) const noexcept {   assert(radius > 1);   const int width  = 1+(radius*2);   const int height = width;   boost::shared_ptr<ribi::TextCanvas> canvas(     new TextCanvas(width,height)   );   const double pi = boost::math::constants::pi<double>();   //Inside circle   {     const std::vector<char> gradient { Canvas::GetAsciiArtGradient() };     const double f_b { static_cast<double>(GetLed()->GetBlue() ) / 255.0 };     const double f_g { static_cast<double>(GetLed()->GetGreen()) / 255.0 };     const double f_r { static_cast<double>(GetLed()->GetRed()  ) / 255.0 };     const double f_c { (f_r + f_g + f_b) / 3.0 }; //Fraction of color     const double f_i { GetLed()->GetIntensity() };     const double f { f_c * f_i };     const int gradient_index {       static_cast<int>(         f * static_cast<double>(gradient.size())       )     };     const char c { gradient[gradient_index] };     const double midx = static_cast<double>(radius);     const double midy = static_cast<double>(radius);     for (int y=0; y!=height; ++y)     {       for (int x=0; x!=width; ++x)       {         const double x_co { static_cast<double>(x) };         const double y_co { static_cast<double>(y) };         const double dx { x_co - midx };         const double dy { y_co - midy };         const double dist { std::sqrt( (dx*dx) + (dy*dy) ) };         if (dist < static_cast<double>(radius))         {           canvas->PutChar(x,y,c);         }       }     }   }   //Circle   {     const int n_steps = std::ceil(2.0 * pi * static_cast<double>(radius));     for (int i=0; i!=n_steps; ++i)     {       const double f = static_cast<double>(i) / static_cast<double>(n_steps);       const double angle = f * 2.0 * pi;       const double midx = static_cast<double>(radius);       const double midy = static_cast<double>(radius);       const double ray = static_cast<double>(radius);       const int x = static_cast<int>(std::round(midx + (std::sin(angle) * ray)));       const int y = static_cast<int>(std::round(midy - (std::cos(angle) * ray)));       canvas->PutChar(x,y,'*');     }   }   return canvas; } std::ostream& ribi::operator<<(std::ostream& os, const LedWidget& widget) noexcept {   os     << "<LedWidget>"     //<< widget.GetGeometry()     << *widget.m_led     << "</LedWidget>";   return os; }