函数名: graphdefaults

功 能: 将所有图形设置复位为它们的缺省值

用 法: void far graphdefaults(void);

程序例:

#include <graphics.h>

#include <stdlib.h>

#include <stdio.h>

#include <conio.h>

int main(void)

{

/* request auto detection */

int gdriver = DETECT, gmode, errorcode;

int maxx, maxy;

/* initialize graphics and local variables */

initgraph(&gdriver, &gmode, "c:\\\\bor\\\\Borland\\\\bgi");

/* 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 */

}

maxx = getmaxx();

maxy = getmaxy();

/* output line with non-default settings */

setlinestyle(DOTTED_LINE, 0, 3);

line(0, 0, maxx, maxy);

outtextxy(maxx/2, maxy/3, "Before default values are restored.");

getch();

/* restore default values for everything */

graphdefaults();

/* clear the screen */

cleardevice();

/* output line with default settings */

line(0, 0, maxx, maxy);

outtextxy(maxx/2, maxy/3, "After restoring default values.");

/* clean up */

getch();

closegraph();

return 0;

}