函数名: rectangle

功 能: 画一个矩形

用 法: void far rectangle(int left, int top, int right, int bottom);

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 left, top, right, bottom;

/* 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 */

}

left = getmaxx() / 2 - 50;

top = getmaxy() / 2 - 50;

right = getmaxx() / 2 + 50;

bottom = getmaxy() / 2 + 50;

/* draw a rectangle */

rectangle(left,top,right,bottom);

/* clean up */

getch();

closegraph();

return 0;

}