The February 2012 Tutorial Discussion

[handrawn]

Back to handrawn's example. I think he is talking about animations showing the effect of gravity

Hi Larry

yes

the apogee [point furthest away from centre in orbital path] is an example of an 'inertia point', that is an instant in the motion of an object when it is actually very fleetingly at rest [ie not moving]

traditionally animators 'slow out' when motion picks up and 'slow in' when motion slows down - what those terms mean is that you 'bunch up' your drawings and thereby slow down the uniformity of motion, but you do it in such a way as to make the increase in speed visible in the 'slow out' and the decrease in speed visible in the 'slow in'

the attached shows a pendulum with the [slow out slow in] chart that represents the frames, and you can see the bunching [its a simplified set of course] - doesn't take a lot of imagination to turn that pendulum chart into a ball bouncing from floor to ceiling [hopefully]

in cell animation all these frames would be drawn [both the keys and the 'inbetweens']

that covers the timing - I guess you can use tweening in xara to change the shape by generating the inbetweens, rather than having to draw all of them yourself

[note 'slowing out' is often called 'easing out' and 'slowing in' 'easing in']