\param xc X coordinate of arc center
\param yc Y coordinate of arc center
\param flag1 reverse direction flag
\param xc X coordinate of arc center
\param yc Y coordinate of arc center
\param flag1 reverse direction flag
\param xc X coordinate of arc center
\param yc Y coordinate of arc center
\param flag1 reverse direction flag
\param xc X coordinate of arc center
\param yc Y coordinate of arc center
\param flag1 reverse direction flag