public void Update()
{
Vector2 lineStart = Helper.GetVector2(_lineStartTrans);
Vector2 lineEnd = Helper.GetVector2(_lineEndTrans);
Vector2 circlePos = Helper.GetVector2(_circlePosTrans);
Vector2 r0;
Vector2 r1;
int rootCount = Math2d.LineCircleCollision(lineStart, lineEnd, circlePos, _radius, out r0, out r1);
if (rootCount > 0)
{
_interTrans0.position = r0;
_interTrans1.position = r1;
}
}