Re: move an object by animation and leave it in the new position



"Echo S" wrote:

"mjzocc" <mjzocc@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:68D8EE3A-2A8D-4238-85F2-8A157918844E@xxxxxxxxxxxxxxxx

Hello again -

http://mathworld.wolfram.com/Cycloid.html>
The above link shows exactly what I want to learn to do - that red or
orange
trace made by the point on the circle is the path I'd like to generate

Well, I played around a little with this this morning, and I think the red
trace is definitely the most difficult part. I wasn't able to get the timing
and placement exact, but here's what I did:

I created the circle that spins and moves and made it spin and move by
adding a spin emphasis and a motion path as described earlier in the thread.

I put a straight line at the bottom of the circles to serve as kind of a
"floor" or baseline.

For the red "arc" trace, I added an arc autoshape (under the basic shapes
list) and made it a semicircle by dragging one of the yellow diamonds. I
then resized until I got a semi-circular shape.

I put the arc underneath the floor, and I gave it a spin emphasis animation.
I specified a half spin in the animation's properties. I had the half-spin
begin "with previous" when the motion path and spin of the small circle
begins.

I placed a background-colored box on top of the arc. It basically covers the
bottom half of the slide. So the slide looks like the circle sitting on a
floor. Because the arc is covered by the box, you can't see it until it
animates.

Because the animation in the link actually goes twice, I extended the motion
path of the circle and set the spin emphasis to spin twice. And I created a
second arc immediately beside the first. (Actually, I just copied the first
arc). I set it to animate "with previous" also, but I showed the advanced
animation timeline and dragged its start point to begin when the first arc
ends.

The timing on mine isn't perfect, and I think my arc shape is a bit off.
This could probably be fixed with a lot of tweaking, but as I think I said
somewhere in the thread, I think it has the potential to be pretty tedious.

Maybe one of the others who's better at animation than I will have a better
method. I'm sure there's more than one way to skin this cat!

One thing -- it might be better to use the line tools and Edit Points to
draw the arc instead of using the autoshapes. Not sure, but you might get a
more accurately shaped arc.

--
Echo [MS PPT MVP] http://www.echosvoice.com
What's new in PPT 2007? http://www.echosvoice.com/2007.htm
Fixing PowerPoint Annoyances http://www.oreilly.com/catalog/powerpointannoy/
PPTLive! Sept 17-20, 2006 http://www.pptlive.com

Thanx for your efforts in working this problem - I sincerely apprciate it - but we're still not quite in synch!

The cycloid (or arch. loosely speaking) needs to be generated by the motion
of the small "dot" on the circumference of the circle.

Picture this: 1. circle on a flat surface, with the small dot on the
circumference. Now stick a pen thru the dot, so that as the circle begins to
move, the pen will describe a path. That's quite different from separately
drawing an "arch" as you had described.

So as the circle rotates, the "pen" will draw the path that the point on the
circumference travels. As we know, that resultant path is a cycloid - I just
haven't yet figured how to get that orange tracing.

I sincerely appreciate your efforts!

Regards Mike

.

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