Virtual C++ 6.0编写的圆内旋轮线，2个动圆。动态演示圆内旋轮线轨迹。Q、W键调整外圆大小，A、S键调整内圆1大小，Z、X键调整内圆2大小。-Virtual C++ 6.0 written round hypotrochoid, two moving circle. Cycloid circular trajectory within a dynamic presentation. Q, W keys to adjust the outer size, the size of the inner circle 2 A, within the S key to adjust the size of round 1, Z, X keys to adjust.