# onResize CPU intensive, please help :'(

**URL:** <https://forum.kirupa.com/t/onresize-cpu-intensive-please-help/231983>\
**Category:** flash\
**Created:** [July 10, 2007, 8:40am UTC](https://forum.kirupa.com/t/onresize-cpu-intensive-please-help/231983 "2007-07-10T08:40:38Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Dwight](https://avatars.discourse-cdn.com/v4/letter/d/85e7bf/32.png) [@Dwight](https://forum.kirupa.com/u/Dwight)\
**Post date:** [July 10, 2007, 8:40am UTC](https://forum.kirupa.com/t/onresize-cpu-intensive-please-help/231983/1 "2007-07-10T08:40:38Z")

</div>

Hi all, I have done a search on this topic, but couldn’t find the right solution for me.

I’ve made a flash file which contains the following:[LIST=1]  
[_][COLOR=RoyalBlue]backgroundMC [/COLOR](consist of vector art made in illustrator and imported)  
[_][COLOR=RoyalBlue]holderMC [/COLOR](loads an external swf which contains my game)[/LIST]I want the background to scale when the Stage get resized so I used the following code as everyone else does:  
ActionScript Code:  
[FONT=Courier New][LEFT][COLOR=#0000ff]Stage[/COLOR].[COLOR=#0000ff]scaleMode[/COLOR] = [COLOR=#ff0000]“noScale”[/COLOR];  
[COLOR=#0000ff]Stage[/COLOR].[COLOR=#0000ff]align[/COLOR] = [COLOR=#ff0000]“LT”[/COLOR];

[COLOR=#000000] **function** [/COLOR] resizeBGCOLOR=#000000[/COLOR] [COLOR=#000000]{[/COLOR]  
backgroundMC.[COLOR=#0000ff]\_width[/COLOR] = [COLOR=#0000ff]Stage[/COLOR].[COLOR=#0000ff]width[/COLOR];  
backgroundMC.[COLOR=#0000ff]\_height[/COLOR] = [COLOR=#0000ff]Stage[/COLOR].[COLOR=#0000ff]height[/COLOR];  
backgroundMC.[COLOR=#0000ff]\_x[/COLOR] = [COLOR=#0000ff]Math[/COLOR].[COLOR=#0000ff]round[/COLOR][COLOR=#000000]([/COLOR][COLOR=#0000ff]Stage[/COLOR].[COLOR=#0000ff]width[/COLOR] / [COLOR=#000080]2[/COLOR][COLOR=#000000])[/COLOR];  
backgroundMC.[COLOR=#0000ff]\_y[/COLOR] = [COLOR=#0000ff]Math[/COLOR].[COLOR=#0000ff]round[/COLOR][COLOR=#000000]([/COLOR][COLOR=#0000ff]Stage[/COLOR].[COLOR=#0000ff]height[/COLOR] / [COLOR=#000080]2[/COLOR][COLOR=#000000])[/COLOR];  
[COLOR=#000000]}[/COLOR]

[COLOR=#000000] **var** [/COLOR] stageL:[COLOR=#0000ff]Object[/COLOR] = [COLOR=#000000] **new** [/COLOR] [COLOR=#0000ff]Object[/COLOR]COLOR=#000000[/COLOR];

stageL.[COLOR=#0000ff]onResize[/COLOR] = [COLOR=#000000] **function** [/COLOR]COLOR=#000000[/COLOR][COLOR=#000000]{[/COLOR]  
resizeBGCOLOR=#000000[/COLOR];  
holderMC.[COLOR=#0000ff]\_x[/COLOR] = [COLOR=#0000ff]Math[/COLOR].[COLOR=#0000ff]round[/COLOR][COLOR=#000000]([/COLOR][COLOR=#000000]([/COLOR][COLOR=#0000ff]Stage[/COLOR].[COLOR=#0000ff]width[/COLOR] / [COLOR=#000080]2[/COLOR][COLOR=#000000])[/COLOR]-[COLOR=#000080]360[/COLOR][COLOR=#000000])[/COLOR];  
holderMC.[COLOR=#0000ff]\_y[/COLOR] = [COLOR=#0000ff]Math[/COLOR].[COLOR=#0000ff]round[/COLOR][COLOR=#000000]([/COLOR][COLOR=#000000]([/COLOR][COLOR=#0000ff]Stage[/COLOR].[COLOR=#0000ff]height[/COLOR] / [COLOR=#000080]2[/COLOR][COLOR=#000000])[/COLOR]-[COLOR=#000080]150[/COLOR][COLOR=#000000])[/COLOR];  
[COLOR=#000000]}[/COLOR]

[COLOR=#0000ff]Stage[/COLOR].[COLOR=#0000ff]addListener[/COLOR]COLOR=#000000[/COLOR];  
[/LEFT]  
[/FONT]

This works perfectly fine for me, but it has one glitch… :huh:  
The Stage.addListener keeps on listening for the Stage to resize, but this seems to cause my game.swf to run real slow :’(

If I use  
ActionScript Code:  
[FONT=Courier New][LEFT][COLOR=#0000ff]Stage[/COLOR].[COLOR=#0000ff]removeListener[/COLOR]COLOR=#000000[/COLOR];  
[/LEFT]  
[/FONT]

it should be resolved, but…

Then if I resize my window the backgroundMC doesn’t, because the listener isn’t active anymore… Is there a way to resolve this?

\*\*So to make a long story short:  
\*\*I want my Stage to resize the backgroundMC, but without causing my game.swf (which is dynamicly loaded) to run slow…

Thanks in advance :nose: