[Tweener] Tween around circular path

[Fred Naude]

Thanks Zeh,

 

I still seem to be missing some point though.

I have created a class with this code:

 

package

{

                import flash.display.*;

                import caurina.transitions.*;

                

                public class CircularTest extends MovieClip

                {

                                                var myObject:Object;

                                                var whatever:Whatever = new
Whatever();

                                                protected var
_objectAngle:Number

                                                

                                                public function
CircularTest()

                                                {

 
addChild(whatever);

 
Tweener.addTween(whatever, {objectAngle: 50, time:1});

                                                }

                

                                                public function get
objectAngle(): Number 

                                                {

                                                                return
_objectAngle;

                                                }

                

                                                public function set
objectAngle(__value:Number): void 

                                                {

                                                                if
(_objectAngle!= __value) {

 
_objectAngle= __value;

                                

                                                                // Redraw
object

                                                                var
radiusX:Number = 10;

                                                                var
radiusY:Number = 20;

                                                                var
px:Number = Math.cos((_objectAngle / 180) * Math.PI) * radiusX;

                                                                var
py:Number = Math.sin((_objectAngle / 180) * Math.PI) * radiusY;

                                                                myObject.x =
px;

                                                                myObject.y =
py;

                                                }

                                }

 

                }

}

 

But I get the following error:

 

## [Tweener] Error: The property 'objectAngle' doesn't seem to be a normal
object property of [object Whatever] or a registered special property.

 

What should the property be that I should be using?

 

Thanks,

 

Fred

 

From: tweener-bounces at lists.caurinauebi.com
[mailto:tweener-bounces at lists.caurinauebi.com] On Behalf Of Zeh Fernando
Sent: 02 November 2009 09:24 PM
To: tweener at lists.caurinauebi.com
Subject: Re: [Tweener] Tween around circular path

 

Oops, the setter should be

public function set objectAngle(__value:Number): void {

instead of just "angle".

Also, you'd use it like...

Tweener.addTween(whatever, {objectAngle: 50, time:1});

Etc.

Zeh

On Mon, Nov 2, 2009 at 2:22 PM, Zeh Fernando <zeh at zehfernando.com> wrote:

That's a way, but personally I believe it's way too wacky.

Personally, independently of the tweening engine used, I'd create a function
that allowed you to project an object on the ellipse then create a
getter/setter and just tween it. Something like


protected var _objectAngle:Number

public function get objectAngle(): Number {
    return _objectAngle;
}

public function set angle(__value:Number): void {
    if (_objectAngle!= __value) {
        _objectAngle= __value;

        // Redraw object
        var radiusX:Number = 10;
        var radiusY:Number = 20;
        var px:Number = Math.cos((_objectAngle / 180) * Math.PI) * radiusX;
        var py:Number = Math.sin((_objectAngle / 180) * Math.PI) * radiusY;
        myObject.x = px;
        myObject.y = py;
    }
}


Something like that. You may need additional transformation if you want to
rotate the ellipsis itself instead of using simple x/y radius.

Zeh

On Mon, Nov 2, 2009 at 2:09 PM, Fred Naude <info at headspacemedia.co.za>
wrote:

HI there list,

 

How would I go about tweening an object around an ellipse with tweener? 

Is using Bezier points the only way?

 

Thanks,

 

Fred

 

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