transformAroundCenter problem

AlexGD · December 11, 2013

Sometimes I have error:

TypeError: Error #1009: Cannot access a property or method of a null object reference.

at com.greensock.plugins::TransformAroundPointPlugin/_onInitTween()[/Active/_Flash/_AS3_v12/src/com/greensock/plugins/TransformAroundPointPlugin.as:96]

at com.greensock.plugins::TransformAroundCenterPlugin/_onInitTween()[/Active/_Flash/_AS3_v12/src/com/greensock/plugins/TransformAroundCenterPlugin.as:58]

at com.greensock::TweenLite/_initProps()[/Active/_Flash/_AS3_v12/src/com/greensock/TweenLite.as:590]

at com.greensock::TweenLite/_init()[/Active/_Flash/_AS3_v12/src/com/greensock/TweenLite.as:555]

at com.greensock::TweenLite/render()[/Active/_Flash/_AS3_v12/src/com/greensock/TweenLite.as:700]

at com.greensock::TweenLite()[/Active/_Flash/_AS3_v12/src/com/greensock/TweenLite.as:488]

at com.greensock::TweenLite/_init()[/Active/_Flash/_AS3_v12/src/com/greensock/TweenLite.as:505]

at com.greensock::TweenMax/render()[/Active/_Flash/_AS3_v12/src/com/greensock/TweenMax.as:970]

at com.greensock.core::SimpleTimeline/render()[/Active/_Flash/_AS3_v12/src/com/greensock/core/SimpleTimeline.as:166]

at com.greensock.core::Animation$/_updateRoot()[/Active/_Flash/_AS3_v12/src/com/greensock/core/Animation.as:570]

Problem is not so critical for flash player, but very critical for iOS (application crash).

We are using club swc (latest version).

Carl · December 11, 2013

Hi and welcome to the GreenSock forums.

99.9% of the times error 1009 is caused by passing an invalid (undefined) target to a tween.

The best thing to do is trace() out your tween target before running the tween that is causing the error like so

trace("target = " + mc);
TweenLite.to(mc, 1, {x:100})

If that trace produces "target = undefined", then you know the problem is with your code and not the engine.

However, if mc is defined immediately prior to the tween, then perhaps there is something we need to look at.

Either way, it would be most helpful if you could provide a very simple set of files that clearly illustrates the problem. You can zip your files and attach them to this thread

AlexGD · December 13, 2013

Yeap, I understand it.

In my case mc defined at start of Tween. Of course, it is defined until tween is not completed, but... in progress of tween I can remove this mc from stage (container), so mc will not have parent.

In this plugin - parent of mc is not checked.

This is not so rare situation to ignore it...

Thanks in advance for fix it..

Carl · December 13, 2013

Hi,

I created a small sample file where I remove an object from its parent mid-tween and could not replicate the error your are referring to:

import com.greensock.TweenLite; 
import com.greensock.plugins.TweenPlugin; 
import com.greensock.plugins.TransformAroundPointPlugin; 
import com.greensock.plugins.TransformAroundCenterPlugin; 
TweenPlugin.activate([TransformAroundPointPlugin, TransformAroundCenterPlugin]); //activation is permanent in the SWF, so this line only needs to be run once.


TweenLite.to(container.mc, 2, {transformAroundCenter:{scale:1.5, rotation:150}}); 


TweenLite.delayedCall(0.5, remove)


function remove() {
trace(container.mc.parent);
trace("remove");
container.removeChild(container.mc); 
trace(container.mc.parent);
}

I've attached my version, it would be most helpful if you could edit it or provide a similar file that illustrates the error in a clear and concise fashion. If there's a bug somewhere, we certainly want to fix it.

Thanks

TransformAroundCenterTest.fla.zip

AlexGD · December 20, 2013

import com.greensock.TweenLite; 
import com.greensock.plugins.TweenPlugin; 
import com.greensock.plugins.TransformAroundPointPlugin; 
import com.greensock.plugins.TransformAroundCenterPlugin; 
import flash.display.Sprite;

TweenPlugin.activate([TransformAroundPointPlugin, TransformAroundCenterPlugin]); //activation is permanent in the SWF, so this line only needs to be run once.


var container:Sprite = new Sprite();
container.name = "container";
container.graphics.clear();
container.graphics.beginFill(0xff00ff,1);
container.graphics.drawRect(0, 0, 300, 300);
container.graphics.endFill();

this.addChild(container);

var mc:Sprite = new Sprite();
mc.name = "mc";
mc.graphics.clear();
mc.graphics.beginFill(0xffff00,1);
mc.graphics.drawRect(0, 0, 100, 100);
mc.graphics.endFill();

container.addChild(mc);

TweenLite.to(mc, 2, {transformAroundCenter:{scale:2, rotation:360}, delay:1}); 
TweenLite.delayedCall(0.5, remove)


function remove() {
	container.removeChild(mc); 
}