题目：一个最优美的图案（在TC中实现）。

include "graphics.h"

include "math.h"

include "dos.h"

include "conio.h"

include "stdlib.h"

include "stdio.h"

include "stdarg.h"

define MAXPTS 15

define PI 3.1415926

struct PTS {
int x,y;
};
double AspectRatio=0.85;
void LineToDemo(void)
{
struct viewporttype vp;
struct PTS points[MAXPTS];
int i, j, h, w, xcenter, ycenter;
int radius, angle, step;
double rads;
printf(" MoveTo / LineTo Demonstration" );
getviewsettings( &vp );
h = vp.bottom - vp.top;
w = vp.right - vp.left;
xcenter = w / 2; / Determine the center of circle /
ycenter = h / 2;
radius = (h - 30) / (AspectRatio 2);
step = 360 / MAXPTS; / Determine # of increments /
angle = 0; / Begin at zero degrees /
for( i=0 ; i<MAXPTS ; ++i ){ / Determine circle intercepts /
rads = (double)angle PI / 180.0; / Convert angle to radians /
points[i].x = xcenter + (int)( cos(rads) radius );
points[i].y = ycenter - (int)( sin(rads) radius AspectRatio );
angle += step; / Move to next increment /
}
circle( xcenter, ycenter, radius ); / Draw bounding circle /
for( i=0 ; i<MAXPTS ; ++i ){ / Draw the cords to the circle /
for( j=i ; j<MAXPTS ; ++j ){ / For each remaining intersect /
moveto(points[i].x, points[i].y); / Move to beginning of cord /
lineto(points[j].x, points[j].y); / Draw the cord */
}
}
}
int main()
{
int driver,mode;
driver=CGA;mode=CGAC0;
initgraph(&driver,&mode,"");
setcolor(3);
setbkcolor(GREEN);
LineToDemo();
}