[Qt-qml] Animated text halo: How to animate?

[Eduardo Fleury]

Hi Charley,

IIRC, the "Rotation" object you created is an ordinary object, thus can
receive an "id" and have animations on its properties.

In other words, try changing "angle: 72" by a "NumberAnimation on angle {
something }"

Alternatively you could give an "id" to this Rotation element and then play
with "myRotationId.angle"

On Tue, Oct 19, 2010 at 5:54 PM, Charley Bay <charleyb123 at gmail.com> wrote:

> I'm trying to create QML code that rotates text in an
> apparent "halo" (like around a circle/sphere).  This should
> be easy, but I can't figure out how to animate aspects of
> a "transform: Rotation"
>
> For example, the following displays text that properly
> "rotates" back-and-forth, but I want to dynamically
> change the "angle" in the Rotation transform to make
> it "appear" that the text is "wrapping around" the circle
> as it approaches the edges:
>
>  Text {
>     text: "hello world!"
>     // HOW TO ANIMATE CHANGES IN "angle" ???
>     transform: Rotation { origin.x: 100; origin.y: 100; axis { x: 0;
> y: 1; z: 0 } angle: 72 }
>     smooth: true
>     SequentialAnimation on x {
>         loops: Animation.Infinite
>         NumberAnimation { to: 100; easing.type: Easing.InOutCubic;
> duration: 2000 }
>         NumberAnimation { to: 0; easing.type: Easing.InOutCubic;
> duration: 2000 }
>     }
>  }
>
> I looked at "RotationAnimation", but I can't seem to get it
> working right, and it doesn't seem to let me fiddle with
> the "z" axis (I may later want to "tilt" the text front-or-back
> by setting the z axis).
>
> Suggestions?  The goal is animated text-in-a-halo, possibly
> with front-on tilt perspective (e.g., so the user can see the
> "back" of the rotation with the text mirrored backwards).
> The "transform: Rotation {}" appears to be absolutely
> sufficient to get the proper "perspective" on the rotating
> text, (so I know it can be done), but I'm open to any
> suggestions.
>
> Thanks!
>
> --charley
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>



-- 
Eduardo M. Fleury
OpenBossa - INdT
http://eduardofleury.com/
http://www.openbossa.org/
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