addChild()/Implicit Coercion - Flash AS3

Question

I'm sort of new to Flash. I understand it's nearly obsolete, but the project I'm working on is written in Flash.

My current task is to obtain RGB data from any pixel in a .jpg file. I have done the following so far:

I have saved the image as a .fla file, and converted the image itself into its own custom class, called "StageWheel", with BitmapData as its base class. However, when I do this:

  var sWheel:StageWheel = new StageWheel();
  addChild(sWheel);
  sWheel.addEventListener(MouseEvent.CLICK, getColorSample);

  var bitmapWheel:BitmapData = new BitmapData(sWheel.width, sWheel.height);

I get an error:

"Implicit coercion of a value of type StageWheel to an unrelated type flash.display.DisplayObject"

on the line with

addChild(sWheel);

What does this error mean? Can I not use addChild to add things to the stage this way?

EDIT

That worked @LDMS, thank you. I am now trying to do this later on:

var rgb:uint = bitMapWheel.getPixel(sWheel.mouseX,sWheel.mouseY);

and get an error

"1061: Call to a possibly undefined method getPixel through a reference with static type flash.display:Bitmap."

What does this mean? Can I not use getPixel on a Bitmap? Sorry for the newbiness, for some reason Flash is extremely difficult for me to learn.

Sorry. I created a .fla file with the .jpg image inserted on the stage, then converted the .jpg file to a bitmap, and created the custom class. — UMich_2017
Yes, true. Still getting the same error after trying what you said. If the base class is BitmapData, why would I define bitmapWheel as a Bitmap? — UMich_2017
As you have it, with your bitmapWheel var, you are just creating a new empty BitmapData that matches the width and height or your sWheel bitmap data. your sWheel instance is already BitmapData, you don't need to create another bitmap data var. — BadFeelingAboutThis
You have some inconsistencies with how your spell bitmapWheel (eg. uppercase M sometimes). — BadFeelingAboutThis

BadFeelingAboutThis BadFeelingAboutThis · Accepted Answer · 2015-05-04T17:36:11

Your StageWheel class is BitmapData, which is not itself a display object that can be added to the stage.

You need to wrap your bitmap data into a Bitmap to make it a display object.

var sWheel:BitmapData = new StageWheel(); //This is bitmap data, which is not a display object, just data at this point.

//to display the bitmap data, you need to create a bitmap and tell that bitmap to use the bitmap data
var bitmapWheel:Bitmap = new Bitmap(sWheel);

//now you can add the bitmap to the display list
addChild(bitmapWheel);

EDIT For the second part of your question, you need to acess the bitmap data of the bitmap to use getPixel

bitmapWheel.bitmapData.getPixel(bitmapWheel.mouseX,bitmapWheel.mouseY);

addChild()/Implicit Coercion - Flash AS3

1 Answers