Error 5000: The class 'Particle' must subclass 'flash.display.MovieClip' because it is linked to a symbol in the library of this type.

Running Flash CS3, I looked at the tutorial from lynda.com on strengthening the systems of particles in ActionScript 3.0 to create a few sparks shooting in an animation.  I'm stuck to what I think is a point really basic, but I can't seem to cross it.  Basically, all I'm doing at this point is to create a class called particle (that I'll learn to do things that the particles to make a little later) bind it to a MovieClip on the stage in my .fla file and use the function to update the particle to move it around the stage in a way defined in the instance (so I can later give properties of different movement to) each as an instance generated the MC).  I know there are easier ways to accomplish my basic task without loading an external module, but this seems to makes it so I have to hurt something very simple, that I 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 file Test.fla Spark.

In Particle.as, I have the following code:

package
{
import flash.display. *;

Particles/public class extends MovieClip
{
public xVelocity:Number;
public yVelocity:Number;

public void Particle()
{
xVelocity = 0;
yVelocity = 0;
}

public void update (): void
{
This.x += xVelocity;
This.y += yVelocity.

}
}
}

So, I declare that all the particles are built with no movement, but if they are explicitly granted an x or y velocity, they will pass by there a lot when updating the instance function is called in the timeline panel.

Then in my file Test.fla spark, I have a small shape in a MovieClip called Spark.  In the properties of binding of spark, I chose to export for ActionScript and export in first frame.  The class is called Spark and the Base class is the particle.  For testing purposes, I dropped an instance on the stage and called spark.  Then in the layer actions in the first image (the timeline is just the spark layer and the layer actions, a long frame each with no "stop();" so it should run forever), I have included the following code:

spark.xVelocity = 5;
spark.yVelocity = - 1;

function updateSpark(event:Event):void
{
Spark.Update ();
}

addEventListener (Event.ENTER_FRAME, updateSpark);

Is what it seems that this should be on every Flash ENTER_FRAME should call updateSpark, which is a function that handles the event update() for the instance of the spark which is a movieclip instance that has an update event that moves x and y of the position of their relative velocity variables.  It seems simple enough to me, but when I ctrl-enter to test the movie, I get the following compiler 3 errors:

Particle.As line 1: 5000: the class 'Particle' must subclass 'flash.display.MovieClip' because it is linked to a symbol in the library of this type.

Particle.As line 7:1071: syntax error: expected a keyword (for example function definition) after the public attribute, not xVelocity.

Particle.As line 7:1084: Syntax error: expecting rightbrace before the semicolon.

Since I imported flash.display. * and declares the class public particle so it extends MovieClip I have no idea why I get this error of 5000.  I see this issue come up a lot when searching Google and forums, but none of the resolutions that I could find have suggested an approach that applies to me or solve the problem.

Any help to fix this would be appreciated.  I enclose a zip of the FLA a files as described above in case there is something in the settings of publication that I messed up inadvertently.  In addition, if you can get this to compile without error, then the problem may be due to my Flash CS3 Pro install which will result in the problem isn't with my code and start looking at me in a different direction.

Thank you

Scott

Yes, 'var '.

Tags: Adobe Animate

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