[OpenLayers-Users] Tweening pinpoints

Thu Dec 8 08:59:14 EST 2011

Hi Casper

Do you think you could put up an example page somewhere for moving
pinpoints? 
I've put the code in, but throws an error which I'm struggling to get
rid of! 

I've been having a look at this one too
http://openlayers.org/dev/tests/manual/tween.html
<http://openlayers.org/dev/tests/manual/tween.html> 
but not luck converting this into my code. 

Takako

________________________________

From: Casper Span [mailto:info at spatially-oriented.com] 
Sent: 07 December 2011 20:56
To: Takako Tucker
Cc: Adam Eskreis; openlayers-users at lists.osgeo.org
Subject: Re: [OpenLayers-Users] Tweening pinpoints

Hi Takako,

In my example I wanted the map to move.
However, it should be fairly easy to adapt the code to your liking.

Basically what I do is letting the tween class calculate my path &
timing, and on eachStep I move the map. On eachStep, you should move
your pinpoint with something like this: (NOTE: not tested)

someFunc: function() {

// var fromCoord = your starting point
// var toCoord = your destination point
// var duration = number of steps it should take, the more you take, the
smoother the ride & longer it will take. (unless you also change the
INTERVAL constant on Tween)
var callbacks = {
   eachStep: tweenstep
};
var tween = new OpenLayers.Tween(OpenLayers.Easing.Quad.easeInOut);
tween.start(fromCoord, toCoord, duration, {callbacks: callbacks}

},

tweenstep: function (value) {
  // TODO: move your feature to the new coord
  // given in value.x and value.y
},

And another note: the tweenstep function is being called from the tween
class, so you are out of scope and cannot see your feature. That's why,
in my blogpost, I also stored the map object into the tween. You will
probably have to do something similar with your feature.

If you can't get this to work, I might be able to set up a sample
somewhere. Also, you might have some luck looking at the developer
example code:
http://openlayers.org/dev/tests/manual/tween.html

regards,
Casper

On Wed, Dec 7, 2011 at 6:39 PM, Takako Tucker <Takako.Tucker at bbc.co.uk>
wrote:

	Hi, so this is what I currently got. 

	http://paste.org/41978

	I can't seem to see Tweening working between pinpoints... Any
advise would be much appreciated. 
	The map shouldn't move and just pinpoints should move...

	Takako

________________________________

	From: Casper Span [mailto:info at spatially-oriented.com] 
	Sent: 07 December 2011 10:38
	To: Takako Tucker

	Cc: Adam Eskreis; openlayers-users at lists.osgeo.org 

	Subject: Re: [OpenLayers-Users] Tweening pinpoints

	I dabbled a bit with this a few weeks ago and posted a small
blog on it... Maybe it helps.

http://www.spatially-oriented.com/joomla/tech/34-gis-articles/59-animate
d-zoom-with-openlayers

	On Wed, Dec 7, 2011 at 10:55 AM, Takako Tucker
<Takako.Tucker at bbc.co.uk> wrote:

		Thanks for this! I had a look at .Tween, but as it
reacts to DOM elements I couldn't be sure if it works with Lon Lat (X.Y)
figure. 
		I'll try again later on though. 

________________________________

		From: Adam Eskreis [mailto:aeskreis at gmail.com] 
		Sent: 06 December 2011 18:03
		To: Takako Tucker
		Cc: openlayers-users at lists.osgeo.org
		Subject: Re: [OpenLayers-Users] Tweening pinpoints

		There is an OpenLayers.Tween class I believe.

		Also, this is something that could easily be done iwth
just regular javascript.  Don't forget, OpenLayers is comprised of DOM
elements, so you can manipulate the map with regular javascript, you
don't have to use an OpenLayers construct.

		On Tue, Dec 6, 2011 at 12:33 PM, Takako Tucker
<Takako.Tucker at bbc.co.uk> wrote:

			Hello, 

			I'm currently using
OpenLayers.Control.DragFeature to move pinpoint from one place to
another. 

			        var dragFeature = new
OpenLayers.Control.DragFeature(location); 

map.addControl(dragFeature); 
			                         dragFeature.activate();

			But not only moving pinpoints, I need to add
tween animation. 

			Has anyone done tween animation for moving
pinpoints? 

			Any advise would be much appreciated! 

			Thanks 

			Takako 

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