Hi Guys,

i've spent lot of time to find a formula to create a linkage synthesis of three position as can be seen in the gif below. tired of looking on youtube and several websites. no good refferences for me to learn.
in the sketch picture below, i only know how to create simple three position synthesis. but still, i need to know a structurized mechanism like in the gif below.
if you guys know this knowledge, please share here. i'm really curious about this mechanism system.