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872天前#include <graphics.h> |
#include <stdlib.h> |
#include <stdio.h> |
#include <conio.h> |
int main(void) |
{ |
/* select a driver and mode that supports the use */ |
/* of the setrgbpalette function. */ |
int gdriver = VGA, gmode = VGAHI, errorcode; |
struct palettetype pal; |
int i, ht, y, xmax; |
/* initialize graphics and local variables */ |
initgraph(&gdriver, &gmode, ""); |
/* read result of initialization */ |
errorcode = graphresult(); |
if (errorcode != grOk) /* an error occurred */ |
{ |
printf("Graphics error: %s\n", grapherrormsg(errorcode)); |
printf("Press any key to halt:"); |
getch(); |
exit(1); /* terminate with an error code */ |
} |
/* grab a copy of the palette */ |
getpalette(&pal); |
/* create gray scale */ |
for (i=0; i<pal.size; i++) |
setrgbpalette(pal.colors[i], i*4, i*4, i*4); |
/* display the gray scale */ |
ht = getmaxy() / 16; |
xmax = getmaxx(); |
y = 0; |
for (i=0; i<pal.size; i++) |
{ |
setfillstyle(SOLID_FILL, i); |
bar(0, y, xmax, y+ht); |
y += ht; |
} |
/* clean up */ |
getch(); |
closegraph(); |
return 0; |
} |
