C语言fillpoly函数详解

Z时代
2024-01-10
分类：综合

C语言中，fillpoly函数的功能是画一个多边形，今天我们就来学习学习。

C语言fillpoly函数：填充一个多边形

函数名：fillpoly

功能：画并填充一个多边形

头文件：#include <graphics.h>

原型：fillpoly(int numpoints, int far *polypoints);

参数说明：numpoints 为多边形的边数；far *polypoints 为存储各顶点坐标的数组，每两个一组表示一个顶点的 X 和 Y 坐标。

实例代码：


#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;
}