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Various Allegro Issues

Engines and Middleware Programming

Started by valkyr July 19, 2004 11:29 PM

2 comments, last by GameDev.net 19 years, 11 months ago

valkyr

210

Author

July 19, 2004 11:29 PM

Hi, I was just following the examples and tutorials at AGDN. The first two tuts went fine (hello world, and mouse). Well, I got to the third one: Bitmaps. I went through the tutorial and learned all the various stuff; then I went to compile and I got an enormous amount of errors, most being parser errors and `so-and-so' previously deifined here and `so-and-so' was not declared in this scope and ISO C++ forbids `realse_screen' with no type... Ugh.. it goes on and on, most being similar errors. I even tried copying and pasting the source from the tutorial and I got the exact same errors. Here's the code:


#include <allegro.h>

int distance( int x1, int y1, int x2, int y2 )
{
    int sx = ABS( x2 - x1 ), sy = ABS( y2 - y1 );

    return fixtoi( fhypot( itofix( sx ), itofix( sy ) ) );
}

int main()
{
    int x, y, r, g, b;
    BITMAP *bitmap, *behind, *buffer;    
    bool done = FALSE;
    
    allegro_init();
    install_keyboard();
    install_timer();
    install_mouse();
    
    set_color_depth(16);
    if(set_gfx_mode(GFX_AUTODETECT, 1024, 768, 0, 0) < 0)
    {
        set_color_depth(15);
        if(set_gfx_mode(GFX_AUTODETECT, 1024, 768, 0, 0) < 0)
        {
            allegro_message("Unable to initialize graphics module\n %s\n", allegro_error);
            return -1;
        }
    }
    set_mouse_range(0, 0, SCREEN_W - 31, SCREEN_H - 31 );
    
    buffer=create_bitmap( SCREEN_W, SCREEN_H );
    bitmap=create_bitmap( 32, 32 );
    behind=create_bitmap( 32, 32 );
    clear_to_color( bitmap,makecol( 255, 0, 255 ) ); 
    
    //fix up the buffer
    for ( int i = 0; i < SCREEN_W; i++ )
    {
        for ( int j = 0; j < SCREEN_H; j++ )
        {
            if ( i > = 320 )
            {
                r = distance( 629, 469, i, j );
            }
            else
            {
                r = distance( 10, 10, i, j );
            }

            if ( i > = 320 )
            {
                g = distance( 629, 10, i, j );
            }
            else
            {
                g = distance( 10, 469, i, j );
            }
            b = distance( 320, 240, i, j );

            if ( r > 255 ) r = 255;
            if ( g > 255 ) g = 255;
            if ( b > 255 ) b = 255;
            putpixel( buffer, i, j, makecol( 255 - r, 255 - g, 255 - b ) );
        }
    }
    
    circlefill(bitmap, 15, 15, 15, makecol(255,255,255));
    circlefill(bitmap, 15, 15, 15, makecol(255,0,255));
    
    while(!done)
    {
        acquire_screen();
        
        x = mouse_x, y = mouse_y;
        
            blit(buffer, behind, x, y, 0, 0, 32, 32);
            
            draw_sprite(buffer, bitmap, x, y);
            
            blit(buffer, screen, 0, 0, 0, 0, SCREEN_W, SCREEN_H);
            
            blit(behind, buffer, 0, 0, x, y, 32, 32);
            release_screen();
            
            if(key[KEY_ESC] || (mouse_b & 1))
                        done = TRUE;
                        
    }
    
    destroy_bitmap(bitmap);
    destroy_bitmap(behind);
    destroy_bitmap(buffer);
    
    return 0;
}
END_OF_MAIN();