ActionScript 3.0 :: Button Inside MovieClip Linked To A Class?
Oct 8, 2011
I am making a game in Flash CS4 using AS3. This is the point. I have a MovieClip called Menu which holds a button with instance name ButPlay. Menu MovieClip is linked to Menu.as script. This is whats inside the Menu.as:
package
{
import flash.display.MovieClip;
import flash.events.MouseEvent;
[Code].....
When i run the animation i get the this error: TypeError: Error #1009: Cannot access a property or method of a null object reference. at Menu()
When i try to trace the ButPlay inside the Menu i get null object.
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Basically, all I'm trying to do at this point is create a class called Particle (which I will teach to do things that particles do a little later) link it to a MovieClip on the stage in my .fla file and use the particle's update function to move it across the stage in a manner defined in the instance (so I can later give different movement properties to each AS generated instance of the MC). I know there are easier ways to accomplish my base task without loading an external package, but this seems so strightforward that I must be doing something very simple wrong I just can't see so I thought I'd post the code here and see what I'm missing.
I start with a file called Particle.as in the same folder as my Spark Test.fla file.
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package{ import flash.display.*; public class Particle extends MovieClip { public xVelocity:Number; public yVelocity:Number; public function Particle() { xVelocity = 0; yVelocity = 0; } public function update():void { this.x += xVelocity; this.y += yVelocity; } }}
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Particle.as Line 1: 5000: The class 'Particle' must subclass 'flash.display.MovieClip' since it is linked to a library symbol of that type.
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Ok, this is one of those walls that I know once I can jump over it, I will be a much happier developer again.
I've done tons of reading, and think I have a firm understanding that the general consensus is that if you want to reference something, it needs to be added to the display list, using addChild().
I hate to be defiant, but what if I don't want to?
Or at the very least, what if I want to add a movieclip class to the stage using addChild, and then reference objects inside it?
It is much easier this way than what most people recommend - adding 15 objects via addChild, then setting the x and y for the, etc.
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