函数名: cleardevice

功 能: 清除图形屏幕

用 法: void far cleardevice(void);

程序例:

#include

#include

#include

#include

int main(void)

{

/* request auto detection */

int gdriver = DETECT, gmode, errorcode;

int midx, midy;

/* 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 */

}

midx = getmaxx() / 2;

midy = getmaxy() / 2;

setcolor(getmaxcolor());

/* for centering screen messages */

settextjustify(CENTER_TEXT, CENTER_TEXT);

/* output a message to the screen */

outtextxy(midx, midy, "press any key to clear the screen:");

/* wait for a key */

getch();

/* clear the screen */

cleardevice();

/* output another message */

outtextxy(midx, midy, "press any key to quit:");

/* clean up */

getch();

closegraph();

return 0;

}