Elastic question Please help:)

[fallacy]

I have a real simple question:
I want to make text slide in horizontally, come to it’s location, but it goes past it a little bit bouncing back and forth a few times before it stops.

I would like to do this effect with a motion tween but I don’t want to key frame the effect, I want to do it with action script. Can this be done? I looked up and down this entire forum and could not find an example of this.

If anybody can do this can you Please, Please, Please post the .fla

Thanks

[k/smaert]

personally i use an extension for doing things like this. check out http://proto.layer51.com/d.aspx?f=1142 for more info.

this .mxp makes wonders for me.

[jbum]

I like to write these kinds of things myself.
Here's a quicky version. Just attach this script to the first frame of a new movie. Set it to 30 fps for smoother motion.

Taking the time to figure out exactly how this script works will make you a better person

code:

---

MovieClip.prototype.springyXTween = function(destX,stiffK,dampK)

{

	this.destX = destX;

	this.stiffK = stiffK;

	this.dampK = dampK;

	this.vx = 0; // this represents the velocity



	this.onEnterFrame = function()

  {

       // by storing the motion in the velocity variable, we retain inertia

       // and get the springy effect you want

		this.vx += (this.destX - this._x)*this.stiffK;

       // this line causes the motion to lose energy over time, otherwise we'd keep bouncing

		this.vx *= this.dampK;

		this._x += this.vx;

       // this checks to see if we're there yet, if so we stop calling this function

		if (Math.abs(this.vx) < .1 && Math.abs(this.destX - this._x) < .1)

		{

			this._x = this.destX;

			delete this.onEnterFrame;

		}

	}

}



// Create offscreen movie with a text field.

// If you have an existing movie to tween, use that.

_root.createEmptyMovieClip('txt_mc', 1);

txt_mc._x = -100;

txt_mc.createTextField('my_txt', 1, 10, 10, 100, 50);

txt_mc.my_txt.setNewTextFormat(new TextFormat('Courier New', 24, 0x000077, true));

txt_mc.my_txt.text = "sproing!";



// Below is where we set up our tween.

// The first number is the desired destination

//

// Play with the second two numbers (0.1) and (0.7) to

// get different kinds of springy motion.

//

// The second number (0.1) represents the spring stiffness

// (how fast the spring snaps to position) - higher values

// will make the spring travel faster, but may also make it

// go out of control if too high.  Don't use values much higher than .5.

//

// and the third number (range 0.1 to 0.999) represents damping or

// viscosity - lower values will make the object act like it is in heavy oil



txt_mc.springyXTween(300, 0.1, 0.7);

---

For more examples of things moving with springy motion, see my website (link below).

[fallacy]

thanks for replys, but there is nothing on your site that i was looking for k/smaert.

Jbum looks like you have code that creats a text field onload but i am looking to do it with already created text with a motion tween on it.

I am begeining to think there is no way to to it "cries".

[jbum]

If you want to use an existing movie clip, then simply remove these lines:

code:

---

_root.createEmptyMovieClip('txt_mc', 1);

txt_mc._x = -100;

txt_mc.createTextField('my_txt', 1, 10, 10, 100, 50);

txt_mc.my_txt.setNewTextFormat(new TextFormat('Courier New', 24, 0x000077, true));

txt_mc.my_txt.text = "sproing!";

---

and substitute the name of your pre-existing movieclip for txt_mc, in the last line of the script.

If your text field is not currently inside a symbol movieclip, then put it inside one by using convert-to-symbol. This makes it easier to manipulate via actionscript. Use the properties panel to assign the name 'txt_mc' (or whatever you want to use) to the new symbol.

- Jim