void init_gnugraph()
{ int k;
int c; /* color, 0-15 */
int g; /* gray level, 0-15 */
GrSetMode(GR_default_graphics);
numcolors = GrNumColors();
if ( (numcolors < 256) && color_flag )
shading_flag = 0; /* not enough for shading */
/* first index background color */
for ( c = 0 ; c < 16 ; c++ ) color_perm[c] = c;
color_perm[background_color] = 0;
color_perm[0] = background_color;
if ( shading_flag && color_flag )
{ for ( c = 0 ; c < 16 ; c++ )
for ( g = 0 ; g <= MAXGRAY ; g++ )
GrSetColor(CINDEX(c,g),
(int)(0xff*(g+12.)/(MAXGRAY+12.)*rgb_colors[c][0]),
(int)(0xff*(g+12.)/(MAXGRAY+12.)*rgb_colors[c][1]),
(int)(0xff*(g+12.)/(MAXGRAY+12.)*rgb_colors[c][2]));
}
else if ( shading_flag ) /* shading */
{ for ( g = 0 ; g <= MAXGRAY ; g++ )
GrSetColor(CINDEX(WHITE,g),
(int)(0xff*(g+12.)/(MAXGRAY+12.)),
(int)(0xff*(g+12.)/(MAXGRAY+12.)),
(int)(0xff*(g+12.)/(MAXGRAY+12.)));
}
else if ( color_flag )
{ for ( c = 0 ; c < 16 ; c++ )
GrSetColor(CINDEX(c,MAXGRAY),
(int)(0xff*rgb_colors[c][0]),
(int)(0xff*rgb_colors[c][1]),
(int)(0xff*rgb_colors[c][2]));
}
if ( numcolors == 32768 )
GrClearScreen(CINDEX(WHITE,MAXGRAY));
else
{ GrFreeColor(0);
GrSetColor(0,(int)(0xff*rgb_colors[background_color][0]),
(int)(0xff*rgb_colors[background_color][1]),
(int)(0xff*rgb_colors[background_color][2]));
}
maxx = GrMaxX(); maxy = GrMaxY();
if ( maxx/3 < maxy/3 )
{ xscale = maxx/3;
yscale = xscale; /* assume square pixel screen */
}
else
{ yscale = maxy/3;
xscale = yscale; /* assume square pixel screen */
}
}
static void PrintInfo(void)
{
char aux[81];
int x, y;
sprintf(aux, " Mode: %dx%d %d bpp ", GrCurrentVideoMode()->width,
GrCurrentVideoMode()->height, GrCurrentVideoMode()->bpp);
x = (GrMaxX() -
GrFontStringWidth(&GrDefaultFont, aux, strlen(aux), GR_BYTE_TEXT)) / 2;
y = (GrMaxY() -
GrFontStringHeight(&GrDefaultFont, aux, strlen(aux), GR_BYTE_TEXT)) / 2;
GrTextXY(x, y, aux, GrWhite(), GrBlack());
}