C 实战练习题目65

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题目：一个最优美的图案（在TC中实现）。

程序分析：无。

程序源代码：

1 #include \"graphics.h\"2 #include \"math.h\"3 #include \"dos.h\"4 #include \"conio.h\"5 #include \"stdlib.h\"6 #include \"stdio.h\"7 #include \"stdarg.h\"8 #define MAXPTS 159 #define PI 3.141592610 struct PTS {11     int x,y;12 };13 double AspectRatio=0.85;14 void LineToDemo(void)15 {16     struct viewporttype vp;17     struct PTS points[MAXPTS];18     int i, j, h, w, xcenter, ycenter;19     int radius, angle, step;20     double rads;21     printf(\" MoveTo / LineTo Demonstration\" );22     getviewsettings( &vp );23     h = vp.bottom - vp.top;24     w = vp.right - vp.left;25     xcenter = w / 2; /* Determine the center of circle */26     ycenter = h / 2;27     radius = (h - 30) / (AspectRatio * 2);28     step = 360 / MAXPTS; /* Determine # of increments */29     angle = 0; /* Begin at zero degrees */30     for( i=0 ; i<MAXPTS ; ++i ){ /* Determine circle intercepts */31         rads = (double)angle * PI / 180.0; /* Convert angle to radians */32         points[i].x = xcenter + (int)( cos(rads) * radius );33         points[i].y = ycenter - (int)( sin(rads) * radius * AspectRatio );34         angle += step; /* Move to next increment */35     }36     circle( xcenter, ycenter, radius ); /* Draw bounding circle */37     for( i=0 ; i<MAXPTS ; ++i ){ /* Draw the cords to the circle */38         for( j=i ; j<MAXPTS ; ++j ){ /* For each remaining intersect */39             moveto(points[i].x, points[i].y); /* Move to beginning of cord */40             lineto(points[j].x, points[j].y); /* Draw the cord */41         }42     }43 }44 int main()45 {46     int driver,mode;47     driver=CGA;mode=CGAC0;48     initgraph(&driver,&mode,\"\");49     setcolor(3);50     setbkcolor(GREEN);51     LineToDemo();52 }

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