I would like to animate a piston type of instrument and am not sure of the
simplest math to do the translation so I'm asking for help.

If you think of a circle with a connecting rod attached at a point on the
circumference e.g. 270 degrees or at "west" on a compass circle, and fixed
along a vertical slider located below the circle (south of south) such that
point will move only up and down, then when the circle rotates clockwise for
the first 90 degrees (from 270 to 360) the connecting rod will move up at
the lower end and move up and clockwise at the upper end.

How can the angular movement of the connecting rod be modeled simply?

One answer is to define the end points and calculate for each degree of the
circle rotation the new points along the circle and the vertical slider path
and redraw the connecting rod at the new points.

Can this be accomplished through rotation/translation of an existing
connecting rod?


-- 

Stephen
and
Kathie
(S+K)

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