+#if DEBUG_LOG
+ printf "\t\t--- debug istanpt with (x,y)=(%f, %f), A1=%f, B1=%f\n" x y a1 b1
+ printf "theta=%f\n" theta
+ printf "eps_Radian=%f\n" eps_radian
+ printf "(x1, y1)=(%f, %f)\n" x1 y1
+ printf "(x2, y2)=(%f, %f)\n" x2 y2
+ printf "test1=%f\n" test1
+ printf "test2=%f\n" test2
+#endif
+