Inline SVG circles on a circle

[rwv99 0 Likes (Newbie)]

Hello all,

 

Have been searching the forum, but can't find an answer to something that can't be complicated, I'm sure. (Can't get it figured out, though.) Check the Pen: I'm trying to 'shoot' small circles on a larger circle. All the elements are inline SVG (part of a larger drawing), using SVG 'transform: rotate()' on the small circles.

 

If you comment out the 'staggerFrom' you'll see what it's supposed to look like. With the tween active the transforms on the small circles are somehow skipped.

 

Any idea anybody?

 

Thanks,

Ruud.

See the Pen zKmJJo by rwv999 (@rwv999) on CodePen

[Dipscom 3,366 Likes (Superhero)]

That's expected behaviour. The long story short is that GSAP uses x and y as a proxy to transform translate(), they are not the same thing as the x and y in SVG, when you tween the x and y in your pen, you are really overwriting the transform rotate() with new values. 

 

You can do one of two things, reposition your inner circles using transform translate() or use the attrPlugin like so:

TweenMax.staggerFrom(menuItems, 2, {attr:{cx:2000, cy:2000}, autoAlpha: 0, ease: 'Power4.easeOut'}, 0.5);

Does that help?

[rwv99 0 Likes (Newbie)]

Hey Dipscom,

 

Yes, that helps a lot, thanks for the explanation! Should have thought of that myself, animating the SVG attributes, not the CSS. What I don't get is that now the circles seem to come from different starting positions, although the tween uses just one (cx:2000, cy:2000). That also expected behaviour?

 

Thanks,

Ruud.

[Dipscom 3,366 Likes (Superhero)]

Yes it would be, remember you are rotating the inner circles. SVG is rather confusing when it comes to that because of its viewBox attribute and how it behaves, I can't go over it in detail now as I'm away from the computer but once I have a chance, I'll link to a couple of blog posts that describe the viewBox and its behaviour.

[PointC 14,185 Likes (Superhero)]

This is good reading:

 

https://sarasoueidan.com/blog/svg-coordinate-systems/

 

Happy tweening.

[rwv99 0 Likes (Newbie)]

...of course, rotating an element creates a new (rotated) user coordinate space. (Keep forgetting that every now and then...)

 

Thanks for pointing stuff out,

Ruud.

 

(PS. Link refers to Joni Trythall's Pocket Guide to Writing SVG, also an excellent SVG resource, as are Sara S's articles.)

[Dipscom 3,366 Likes (Superhero)]

There you go. You lot got it all sorted amongst yourselves.

[OSUblake 18,475 Likes (Superhero)]

Did you get it working like you wanted to?

 

Here's a demo showing how to position elements around a circle...

See the Pen e86dc71e2406793fb7b899b73f881f67?editors=1010 by osublake (@osublake) on CodePen

 

Remove your transforms, and yours can work the same...

See the Pen WoWoMv?editors=0010 by osublake (@osublake) on CodePen

[rwv99 0 Likes (Newbie)]

Was struggling a bit to get back to the original design, so this helps a lot. I like the efficient coding, definitely have to brush up my trigonometry a bit more...

 

I like the dynamics on this forum, thanks for the input!