画多边形

[c]代码库

#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;
}