解釋
函式名: drawpoly功能: 畫多邊形
用法: void far drawpoly(int numpoints, int far *polypoints);
程式例
#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;
/* 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;
}
