I know its Four Bar Mechanism. While rotating I can't get desired results. Lets say the rest length is 1m. Please refer to the graphics for the details.
How to create a Chebyshev's linkage rig by switching the phase of an IK pole.
Use the IK structure shown below.
- Use the driver to rotate L2 bone between phi_min and phi_max according to the controller's rotation.
- Switch the IK pole angle of the L3 bone to 0 or 180 degrees using the driver according to the rotation angle of the controller.