/// <summary>
/// set rotation of back arm and position relative to arrow
/// </summary>
/// <param name="degree">angle which back arm rotation will be set</param>
public void setBackArm(float degree)
{
Vector3 centerTarget = endArrow.position;
Vector3 centerArm = arm_back.position;
Vector2 out1, out2;
int a = MathFuncs.FindCircleCircleIntersections(
endArrow.position.x, endArrow.position.y, _lengthForeArm,
arm_back.position.x, arm_back.position.y, _lengthBackArm,
out out1, out out2
);
if (float.IsNaN(out1.x))
{
Debug.LogError(a);
return;
}
arm_back.LookAt2D(out1);
forearm_back.position = endArrow.position;
forearm_back.LookAt2D(out1);
cross_arm_back.position = out1;
}