Flash :: Cannot Access Stage Properties From A Method?

May 12, 2011

I have an object on my stage, called obj.I also have a class called "Physics" which contains a bunch of methods for physics, such as inertia, gravity, and bouncing off walls. In order to do some of these,I need access to the stage.stageWidth and stageHeight properties.My code is as follows:

public function wallBounce(obj)
{
this.stageRef = stageRef[code]...

This is supposed to check if the object's x value is greater than the stageWidth or less than 0. When I run this code it says:

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

I am a semi-newbie programmer who is completely self-taught and have no clue what is causing this. I spent a bit googling it, and I think it has something to do with scopes,.

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