drawpoly

函數名: drawpoly

第一個參數，是多邊形的頂點數

第二個參數，該數組存放着多邊形所有頂點(x,y)座標值,即一系列整數對

用 法: void far drawpoly(int numpoints, int far *polypoints);

#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;

/* our polygon array */

int poly[10];

/* initialize 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(errorcode));

printf("Press any key to halt:");

getch;

/* terminate with an error code */

exit(1);

maxx = getmaxx;

maxy = getmaxy;

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 it.

*/

poly[8] = poly[0];

poly[9] = poly[1];

/* draw the polygon */

drawpoly(5, poly);

/* clean up */

getch;

closegraph;

return 0;