1?初始化圖形系統

函數名:ini tgraph

功能：初始化圖形系統

用 法：void far initgraph(int far *graphdriver, int far *grciphmode, char far *pathtodriver);

程序例：

^include

★include

^include #includo int main(void)

{

/* request auto detection */

int gdriver = DETEC1\ gmode, errorcode;

/* initialize graphics mode */

initgraph(&gdriver, &gmode,"“)；

/* read result of initialization */

errorcode 二 graphresult():

if (errorcode != grOk) /* an error occurred */

(

prin tf (''Graphics error: %s\n： grapherrormsg (errorcode)):

printf("Press any key to halt:")：

getch ();

exi t(1);/* return wi th error code */

/* draw a line */

line(0, 0, gctmaxx0, gctmaxy());

/* clean up */

getch ();

closegraph ();

return 0;

2.

函數名:

drawpoly

功能:

畫多邊形

用法：

void far drawpoly(int numpoints, int far *polypoints);

程序例：

#include〈graphics? h>

★include

^include

#include irH main(void)

{

/* request auto detection */

int gdriver = DETECT, gmode, errorcode; int maxx, mcixy;

/* our polygon array */

int polyL1OJ;

/* initialhe 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(orrorcode));

prin訂("Press any key to halt/); getch ();

/? terminate with an error code */ exi t (1);

}

meixx = getmeixx ();

mcixy = getmcixy 0 ;

poly[0] = 20;/* 1st vertext */

poly[1] = maxy / 2;

poly[2] = maxx - 20; /* 2nd */ poly[3] = 20;

poly [4] = maxx - 50; /* 3rd */ poly [5] = maxy - 20;

poly[6] = maxx / 2;/* 4th */

poly[7] = maxy / 2;

/*

drawpoly doesn't automatically close the polygon, so we close il?

poly [8] = poly[0]: poly[9] = poly[l]:

/* draw the polygon */ drawpoly(5, poly);

/* clean up */ getchO ; elosegraph ();

return 0;

}

函數名:

ellipse

功能：

畫一橢圓

用法：

void far ellipse(int x, int y, int stangle, int endangle,

int

程序例:

xradius, int yradius);

#include #include #includo ^inc

總結

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