114 lines
2.4 KiB
C++
114 lines
2.4 KiB
C++
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#include <exception>
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#include <string>
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#include <iostream>
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#include <SDL.h>
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class InitError : public std::exception
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{
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std::string msg;
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public:
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InitError();
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InitError( const std::string & );
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virtual ~InitError() throw();
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virtual const char * what() const throw();
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};
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InitError::InitError() :
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exception(),
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msg( SDL_GetError() )
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{
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}
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InitError::InitError( const std::string & m ) :
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exception(),
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msg( m )
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{
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}
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InitError::~InitError() throw()
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{
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}
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const char * InitError::what() const throw()
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{
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return msg.c_str();
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}
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class SDL
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{
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SDL_Window * m_window;
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SDL_Renderer * m_renderer;
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public:
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SDL( Uint32 flags = 0 );
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virtual ~SDL();
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void draw();
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};
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SDL::SDL( Uint32 flags )
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{
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if ( SDL_Init( flags ) != 0 )
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throw InitError();
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if ( SDL_CreateWindowAndRenderer( 640, 480, SDL_WINDOW_SHOWN,
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&m_window, &m_renderer ) != 0 )
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throw InitError();
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}
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SDL::~SDL()
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{
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SDL_DestroyWindow( m_window );
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SDL_DestroyRenderer( m_renderer );
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SDL_Quit();
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}
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void SDL::draw()
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{
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// Clear the window with a black background
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SDL_SetRenderDrawColor( m_renderer, 0, 0, 0, 255 );
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SDL_RenderClear( m_renderer );
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// Show the window
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SDL_RenderPresent( m_renderer );
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int rgb[] = { 203, 203, 203, // Gray
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254, 254, 31, // Yellow
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0, 255, 255, // Cyan
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0, 254, 30, // Green
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255, 16, 253, // Magenta
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253, 3, 2, // Red
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18, 14, 252, // Blue
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0, 0, 0 // Black
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};
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SDL_Rect colorBar;
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colorBar.x = 0; colorBar.y = 0; colorBar.w = 90; colorBar.h = 480;
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// Render a new color bar every 0.5 seconds
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for ( int i = 0; i != sizeof rgb / sizeof *rgb; i += 3, colorBar.x += 90 )
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{
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SDL_SetRenderDrawColor( m_renderer, rgb[i], rgb[i + 1], rgb[i + 2], 255 );
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SDL_RenderFillRect( m_renderer, &colorBar );
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SDL_RenderPresent( m_renderer );
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SDL_Delay( 500 );
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}
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}
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int main( int argc, char * argv[] )
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{
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try
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{
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SDL sdl( SDL_INIT_VIDEO | SDL_INIT_TIMER );
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sdl.draw();
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return 0;
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}
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catch ( const InitError & err )
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{
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std::cerr << "Error while initializing SDL: "
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<< err.what()
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<< std::endl;
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}
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return 1;
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}
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