Move along path animation/bezier curves

[Sannyasin Sivakatirswami]

> go stack url
> "http://www.himalayanacademy.com/studyhall/yamas_niyamas/
> Yamas_and_Niyamas.rev"
>
> It demonstrates a lot of relatively simple stuff.

Jim wrote:

Sannyasin,
Dazzling application!
How do you get that dove to fly? It is listed in the application 
overview as just a single image.
Jim

===

Well I don't know how "dazzling" it is.. but anyway.. glad you enjoyed 
it. The dove is a stationary animated GIF. To make it move like that we 
did the following, which is a bit of a work around, because of the 
inability of Rev to do smooth Bezer curves.

a) Make line graphic which will serve as the path you want the object 
to move along. could be any straight line... in this case, to make it 
appear the bird was flying naturally I had to use another stack made by 
Alexjandro (??) called "BezierLine1-1.rev" to generate a smooth path 
that approximated the flight path of the bird.
b) copy that object into the stack
c) turn the vis of that graphic false (hide)
d) then use "move the dove along the points of grc dovePath"
e) and tweaked the starting point to match the corner of the button 
that shows the artwork and then move the two simultaneously to make it 
appear like the bird is bringing the picture into the card... the 
scripts are there in the stack script.

All of the above is trivial to implement... actually the toughest thing 
was getting the bezier curve! unfortunately you can draw a vector 
graphic  in any other application and then import this into Rev.... a 
serious drawback for Rev which i hope will get to close to the top of 
the list of new needed features.


Sannyasin Sivakatirswami
Himalayan Academy Publications
at Kauai's Hindu Monastery
katir at hindu.org

www.HimalayanAcademy.com,
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