/*  线弧圆函数  XHYHS.C                        程序设计: 谢 春 2000.1.1.*/

#include"graphics.h"                         /*调用图形库函数*/
#include"math.h"                             /*调用数学函数*/
#include"stdio.h"                            /*调用标准I/O函数*/
#define PI 3.141596                          /*宏定义PI字符串*/

main()                                       /*主函数*/
{
int a=1,n,x=155,y=250;
int gdriver=DETECT,gmode;                    /*定义整型变量gdriver,gmode*/
initgraph(&gdriver,&gmode,"c:\\tc");         /*定义变量后,初始化图形系统*/

cleardevice();
setbkcolor(a);
printf("\n");
printf("\n");
printf("                                           直线,矩形,圆弧,圆形,椭圆\n");
printf("       C  语言图形程序设计\n");
printf("\n");
printf("  线弧圆函数:\n");
printf("      直线  line(x1,y1,x2,y2)\n");
printf("      矩形  rectangle(xl,yt,xr,yb)\n");
printf("      圆弧  arc(x,y,as,ae,r)\n");
printf("      圆形  circle(x,y,r)\n");
printf("      椭圆  ellipse(x,y,as,ae,rx,ry)\n");
printf("\n");
printf("  绘制图形语句:\n");
printf("      直线,矩形,圆弧,圆形,椭圆\n");
printf("      setcolor(11);\n");
printf("      setlinestyle(3,0,1);\n");
printf("      line(2,y,307,y);\n");
printf("      setlinestyle(0,0,1)\n");
printf("      rectangle(2,2,307,463);\n");
printf("      arc(x-72,y,180,360,72);\n");
printf("      circle(x-72,y,36);\n");
printf("      ellipse(x,y,0,360,148,190);\n");
printf("\n");
printf("      按任意键继续 !\n");
setcolor(3);
setlinestyle(0,0,3);                         /*实线线宽3*/
rectangle(2,2,637,477);                      /*绘制图纸边框*/
setcolor(2);
setlinestyle(0,0,1);                         /*实线线宽1*/
rectangle(6,6,318,473);                      /*绘制左窗口框*/
rectangle(322,6,633,473);                    /*绘制右窗口框*/
getch();

/*画一幅,擦一幅*/
for (n=0;n<3;n++)                            /*设置循环演示次数*/
{
setviewport(323,7,632,472,1);                /*设置右窗口*/

/*绘制直线,矩形*/
setcolor(11);
setlinestyle(3,0,1);
line(2,y,307,y);                             /*绘制水平线*/
line(x,50,x,450);                            /*绘制垂直线*/
setlinestyle(0,0,1);
rectangle(2,2,307,463);                      /*绘制矩形框*/
getch();

/*绘制圆弧*/
setcolor(10);
setlinestyle(0,0,3);
arc(x-72,y,180,360,72);                      /*绘制左大圆弧*/
setlinestyle(0,0,3);
arc(x+72,y,0,180,72);                        /*绘制右大圆弧*/
setlinestyle(0,0,1);
arc(x-90,y,180,360,18);                      /*绘制左小圆弧*/
arc(x-54,y,0,180,18);
arc(x+54,y,180,360,18);                      /*绘制右小圆弧*/
arc(x+90,y,0,180,18);
getch();

/*绘制圆形,椭圆*/
setcolor(13);
setlinestyle(0,0,1);
circle(x,y,144);                             /*绘制圆形(经线)*/
circle(x-72,y,36);                           /*绘制左小圆*/
circle(x+72,y,36);                           /*绘制右小圆*/
circle(x-72,y,2);                            /*绘制左圆心*/
circle(x,y,2);                               /*绘制中圆心*/
circle(x+72,y,2);                            /*绘制右圆心*/
setlinestyle(0,0,3);
ellipse(x,y,0,360,148,190);                  /*绘制椭圆(地球)*/
getch();

clearviewport();
}
closegraph();
}