/************************************************************************/
/* A set of concentric circles and four sets of symmetric arcs          */
/************************************************************************/

arc_demo()
        {
        #define WHITE   15
        int     r;
        cls();
        for (r = 100; r > 70; r -= 5)           /* Draw 6 circles       */
                arc(320,100,320+r,100,0,360,WHITE);
        for (r = 70; r > 0; r -= 5)             /* Loop over size       */
                {                               /* Draw next four arcs  */
                arc(320,100,320+r,100, 22, 66,WHITE);
                arc(320,100,320+r,100,112,156,WHITE);
                arc(320,100,320+r,100,202,246,WHITE);
                arc(320,100,320+r,100,292,336,WHITE);
                }
        }

arc(xc,yc,xp,yp,a0,a1,color)
int     xc,yc;                  /* Center of the arc                    */
int     xp,yp;                  /* Any point on full circle             */
int     a0,a1;                  /* Starting and ending angle in degrees */
int     color;                  /* Color of the arc                     */
        {
        brute_arc(xc,yc,xp,yp,a0,a1,color);
        }