函数名: setrgbpalette

功 能: 定义IBM8514图形卡的颜色

用 法: void far setrgbpalette(int colornum, int red, int green, int blue);

程序例:

#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\", 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*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;

}