(C++) WtLedDisplayWidget
January 25, 2018 · View on GitHub
(C++) WtLedDisplayWidget
WtLedDisplayWidget is a Wt widget class to display an CppLedWidget.
Technical facts
./CppWtLedDisplayWidget/wtleddisplaywidget.h
//--------------------------------------------------------------------------- /* WtLedDisplayWidget, Wt widget for displaying the Led class Copyright 2011 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/CppWtLedDisplayWidget.htm //--------------------------------------------------------------------------- #ifndef WTLEDDISPLAYWIDGET_H #define WTLEDDISPLAYWIDGET_H //--------------------------------------------------------------------------- #include <string> #include <vector> //--------------------------------------------------------------------------- #include <boost/signals2.hpp> //--------------------------------------------------------------------------- #include <Wt/WPaintDevice> #include <Wt/WPaintedWidget> //--------------------------------------------------------------------------- struct Led; //--------------------------------------------------------------------------- struct WtLedDisplayWidget : public Wt::WPaintedWidget { WtLedDisplayWidget( const double intensity = 0.0, const unsigned char red = 255, const unsigned char green = 0, const unsigned char blue = 0); const Led * GetLed() const { return m_led.get(); } Led * GetLed() { return m_led.get(); } static const std::string GetVersion(); static const std::vector<std::string> GetVersionHistory(); protected: void paintEvent(Wt::WPaintDevice *paintDevice); private: boost::scoped_ptr<Led> m_led; void DoRepaint(); }; //--------------------------------------------------------------------------- #endif // WTLEDDISPLAYWIDGET_H
./CppWtLedDisplayWidget/wtleddisplaywidget.cpp
//--------------------------------------------------------------------------- /* WtLedDisplayWidget, Wt widget for displaying the Led class Copyright 2011 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/CppWtLedDisplayWidget.htm //--------------------------------------------------------------------------- #include <boost/bind.hpp> #include <boost/numeric/conversion/cast.hpp> //--------------------------------------------------------------------------- #include <Wt/WPainter> #include <Wt/WPen> #include <Wt/WBrush> //--------------------------------------------------------------------------- #include "led.h" #include "wtleddisplaywidget.h" //--------------------------------------------------------------------------- WtLedDisplayWidget::WtLedDisplayWidget( const double intensity, const unsigned char red, const unsigned char green, const unsigned char blue) : m_led(new Led(intensity,red,green,blue)) { assert(m_led); m_led->m_signal_intensity_changed.connect( boost::bind( &WtLedDisplayWidget::DoRepaint, this)); } //--------------------------------------------------------------------------- void WtLedDisplayWidget::DoRepaint() { this->update(); } //--------------------------------------------------------------------------- const std::string WtLedDisplayWidget::GetVersion() { return "1.0"; } //--------------------------------------------------------------------------- const std::vector<std::string> WtLedDisplayWidget::GetVersionHistory() { std::vector<std::string> v; v.push_back("YYYY-MM-DD: version X.Y: [description]"); v.push_back("2011-04-11: version 1.0: initial version"); return v; } //--------------------------------------------------------------------------- void WtLedDisplayWidget::paintEvent(Wt::WPaintDevice *paintDevice) { Wt::WPainter p(paintDevice); const int red = boost::numeric_cast<int>(m_led->GetRed()); const int green = boost::numeric_cast<int>(m_led->GetGreen()); const int blue = boost::numeric_cast<int>(m_led->GetBlue()); const double intensity = m_led->GetIntensity(); const int width = this->width().toPixels(); const int height = this->height().toPixels(); //Fraction red/green/blue const double fR = static_cast<double>(red ) / 255.0; const double fG = static_cast<double>(green) / 255.0; const double fB = static_cast<double>(blue ) / 255.0; { //Draw circle and major surface const double maxBrightness = 0.66 * 255.0; const double minBrightness = 0.25 * maxBrightness; const int r = static_cast<int>( minBrightness + (fR * intensity * (maxBrightness - minBrightness) ) ); const int g = static_cast<int>( minBrightness + (fG * intensity * (maxBrightness - minBrightness) ) ); const int b = static_cast<int>( minBrightness + (fB * intensity * (maxBrightness - minBrightness) ) ); assert( r >= 0 ); assert( r < 256); assert( g >= 0 ); assert( g < 256); assert( b >= 0 ); assert( b < 256); const int pen_width = 1 + (std::min(width,height) / 25); { Wt::WPen pen = p.pen(); pen.setWidth(pen_width); pen.setColor(Wt::WColor(0,0,0)); p.setPen(pen); } p.setBrush(Wt::WBrush(Wt::WColor(r,g,b))); p.drawEllipse( pen_width, pen_width, width - (2 * pen_width), height - (2 * pen_width)); } { //Draw topleft smaller lighter surface const double maxBrightness = 1.00 * 255.0; const double minBrightness = 0.25 * maxBrightness; const int r = static_cast<int>( minBrightness + (fR * intensity * (maxBrightness - minBrightness) ) ); const int g = static_cast<int>( minBrightness + (fG * intensity * (maxBrightness - minBrightness) ) ); const int b = static_cast<int>( minBrightness + (fB * intensity * (maxBrightness - minBrightness) ) ); assert( r >= 0 ); assert( r < 256); assert( g >= 0 ); assert( g < 256); assert( b >= 0 ); assert( b < 256); const int x = (width / 2) - (0.707 * static_cast<double>(width ) * 0.5); const int y = (height / 2) - (0.707 * static_cast<double>(height) * 0.5); const int w = (0.707 * static_cast<double>(width ) * 0.5); const int h = (0.707 * static_cast<double>(height) * 0.5); { Wt::WPen pen = p.pen(); pen.setWidth(1); pen.setColor(Wt::WColor(r,g,b)); p.setPen(pen); } p.setBrush(Wt::WBrush(Wt::WColor(r,g,b))); p.drawEllipse(x,y,w,h); } { //Draw bottomright smaller lighter surface const double maxBrightness = 0.33 * 255.0; const double minBrightness = 0.25 * maxBrightness; const int r = static_cast<int>( minBrightness + (fR * intensity * (maxBrightness - minBrightness) ) ); const int g = static_cast<int>( minBrightness + (fG * intensity * (maxBrightness - minBrightness) ) ); const int b = static_cast<int>( minBrightness + (fB * intensity * (maxBrightness - minBrightness) ) ); assert( r >= 0 ); assert( r < 256); assert( g >= 0 ); assert( g < 256); assert( b >= 0 ); assert( b < 256); const int x = (width / 2) - 1; const int y = (height / 2) - 1; const int w = (0.707 * static_cast<double>(width ) * 0.5); const int h = (0.707 * static_cast<double>(height) * 0.5); { Wt::WPen pen = p.pen(); pen.setWidth(1); pen.setColor(Wt::WColor(r,g,b)); p.setPen(pen); } p.setBrush(Wt::WBrush(Wt::WColor(r,g,b))); p.drawEllipse(x,y,w,h); } } //---------------------------------------------------------------------------