(C++) SDL example 1: moving colors

 

This SDL example shows colors moving, like this screenshot (png).

 

Operating system: Ubuntu

IDE: Qt Creator 2.0.0

Project type: Qt4 Console Application

Selected required modules: QtCore

Compiler: G++ 4.4.1

Additional libraries: SDL

 

 

 

 

 

 

Qt project file

 

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#------------------------------------------------- # # Project created by QtCreator 2010-07-17T14:57:33 # #------------------------------------------------- QT += core QT -= gui TARGET = CppSdlExample1 CONFIG += console CONFIG -= app_bundle TEMPLATE = app LIBS += -L/usr/local/lib -lSDL SOURCES += main.cpp

 

 

 

 

 

Source code

 

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#include <cassert> #include <cstdlib> #include <iostream> #include <SDL/SDL.h> //Adapted from http://www.libsdl.org/intro.en/usingvideo.html int main() {   if ( SDL_Init(SDL_INIT_AUDIO | SDL_INIT_VIDEO) < 0 )   {     std::cerr << "Unable to initialize SDL: " << SDL_GetError() << '\n';     return 1;   }   std::atexit(SDL_Quit);   const int width = 256; //640;   const int height = 256; //480;   SDL_Surface * const screen = SDL_SetVideoMode(width,height, 16, SDL_SWSURFACE);   if (!screen)   {     std::cerr << "Unable to initialize screen: " << SDL_GetError() << '\n';     return 1;   }   Uint16 * const pixels = reinterpret_cast<Uint16*>(screen->pixels);   const Uint16 pitch = screen->pitch;   const SDL_PixelFormat * const pixel_format = screen->format;   int z = 0;   while (1)   {     //Draw pixels     for (int y=0;y!=height;++y)     {       for (int x=0;x!=width;++x)       {         *(pixels + y*pitch/2 + x) = SDL_MapRGB(pixel_format, z+x, z+y, z+x+y);       }     }     //Redraw screen     SDL_UpdateRect(screen, 0, 0, width, height);     //Wait for user to close window     SDL_Event event;     SDL_PollEvent(&event);     if (event.type == SDL_QUIT) exit(0);     ++z;   } }