AS3 Classes Using Inheritance

Comments

Comment #1 (Posted by Jeremy)
Rating
I have tried this with the kaymover class, but keep getting this error: 1120 Access of undefined propert keyCode.

Here is the code:

[code]
package com.mysite.keyboard {
import flash.display.MovieClip;
import flash.events.Event;
import flash.events.KeyboardEvent;
import flash.ui.Keyboard;

public class KeyInheriter extends MovieClip {
private var uKey:Boolean;
private var dKey:Boolean;
private var lKey:Boolean;
private var rKey:Boolean;
private var speedSetter:uint = 5;

public function KeyInheriter() {
stage.addEventListener(Event.ENTER_FRAME, run);
stage.addEventListener(KeyboardEvent.KEY_DOWN, pressed);
stage.addEventListener(KeyboardEvent.KEY_UP, unPressed);
}

private function pressed(event:KeyboardEvent) {
if(keyCode == Keyboard.UP) {
uKey = true;
}
if(keyCode == Keyboard.DOWN) {
dKey = true;
}
if(keyCode == Keyboard.LEFT) {
lKey = true;
}
if(keyCode == Keyboard.RIGHT) {
rKey = true;
}
}

private function unPressed(event:KeyboardEvent) {
if(keyCode == Keyboard.UP) {
uKey = false;
}
if(keyCode == Keyboard.DOWN) {
dKey = false;
}
if(keyCode == Keyboard.LEFT) {
lKey = false;
}
if(keyCode == Keyboard.RIGHT) {
rKey = false;
}
}

private function run(event:Event) {
if(uKey) {
this.y -= speedSetter;
}
if(dKey) {
this.y -= speedSetter;
}
if(lKey) {
this.y -= speedSetter;
}
if(rKey) {
this.y -= speedSetter;
}
}
}
}
[/code]

Any ideas?
Comment #2 (Posted by Jeremy - jermiester2 at juno.com)
Rating
Great tutorial! I tried to apply this to the KeyMover class, but I keep getting the null error (even though it works). I tried adding the ADDED_TO_STAGE command, but to no avail. Here's the code I worked up:

[code]
package com.mysite.keyboard {
import flash.display.MovieClip;
import flash.events.Event;
import flash.events.KeyboardEvent;
import flash.ui.Keyboard;

public class KeyInheriter extends MovieClip {
private var uKey:Boolean;
private var dKey:Boolean;
private var lKey:Boolean;
private var rKey:Boolean;
private var speedSetter:uint = 5;

public function KeyInheriter() {
stage.addEventListener(KeyboardEvent.KEY_DOWN, pressed);
stage.addEventListener(KeyboardEvent.KEY_UP, unPressed);
stage.addEventListener(Event.ENTER_FRAME, run);
}

private function pressed(event:KeyboardEvent) {
if(event.keyCode == Keyboard.UP) {
uKey = true;
}
if(event.keyCode == Keyboard.DOWN) {
dKey = true;
}
if(event.keyCode == Keyboard.LEFT) {
lKey = true;
}
if(event.keyCode == Keyboard.RIGHT) {
rKey = true;
}
}

private function unPressed(event:KeyboardEvent) {
if(event.keyCode == Keyboard.UP) {
uKey = false;
}
if(event.keyCode == Keyboard.DOWN) {
dKey = false;
}
if(event.keyCode == Keyboard.LEFT) {
lKey = false;
}
if(event.keyCode == Keyboard.RIGHT) {
rKey = false;
}
}

private function run(event:Event) {
if(uKey) {
this.y -= speedSetter;
}
if(dKey) {
this.y += speedSetter;
}
if(lKey) {
this.x -= speedSetter;
}
if(rKey) {
this.x += speedSetter;
}
}
}
}

[/code]

Any ideas?
Comment #3 (Posted by Scott - swood03 at jcu.edu)
Rating
Jody,
Excellent tutorial (impressive that you are new to ActionScript...I wish I picked it up that quickly!).

Here's my question:
At the end of your tutorial you state that you can't think of a reason why you would manually want to create the Circle and Square classes. Well I have a need (I think) and it is driving me crazy trying to figure it out.

What if there is something unique about the Circle that the Square doesn't have? So I think you would need to define a Circle class and define those items there instead of using the generated Flash Circle class. Well I thought this would be simple. Just put Circle as the Class and use the ClipDragger as the Base Class (ClipDragger would still have to extend the MovieClip class). I can not get it to work at all.

This is the error I get if I try to create my own Circle class:
5000: The class 'Circle' must subclass 'flash.display.MovieClip' since it is linked to a library symbol of that type.

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