C语言fillpoly函数详解

#include <graphics.h>
#include <stdlib.h>
#include <stdio.h>
#include <conio.h>
 
int main(void)
{
 /* request auto detection */
 int gdriver = DETECT, gmode, errorcode;
 int i, maxx, maxy;
 
 /* our polygon array */
 int poly[8];
 
 /* initialize graphics, 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();
 exit(1);
 /* terminate with an error code */
 }
 
 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;
 
 /*
 4th vertex. fillpoly automatically
 closes the polygon.
 */
 poly[6] = maxx / 2;
 poly[7] = maxy / 2;
 
 /* loop through the fill patterns */
 for (i=EMPTY_FILL; i<USER_FILL; i++)
 {
 /* set fill pattern */
 setfillstyle(i, getmaxcolor());
 
 /* draw a filled polygon */
 fillpoly(4, poly);
 
 getch();
 }
 
 /* clean up */
 closegraph();
 return 0;
}