For quadratic Bezier. Just make sure that 2(P1_next-P0_next) = 2(P2_prev-P1_prev). This is the same as the cubic one.
Yes, you can do this for both. For linear it's just (1 - u)P_0 + uP_1.
For quadratic Bezier. Just make sure that 2(P1_next-P0_next) = 2(P2_prev-P1_prev). This is the same as the cubic one.
Yes, you can do this for both. For linear it's just (1 - u)P_0 + uP_1.