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actionscript-3drawingbitmapdata

as3 Drawing using BitmapData

I am extremely new to actionscript (or any code for that matter) and am having some trouble undertsanding why my code wont work. I am trying to create a small drawing application using BitmapData - there are no errors when I run the code but it doesn't do anything at all. 

   import flash.display.Bitmap;
 import flash.display.BitmapData;
 import flash.display.Sprite;
 import flash.display.Stage;
 import flash.display.StageScaleMode;
 import flash.events.Event;
 import flash.events.MouseEvent;
 import flash.text.TextField;
 import flash.text.TextFieldAutoSize;
 import flash.text.TextFormat;


 var canvas:BitmapData = new BitmapData(100, 100, false, 0x009900); 

 stage.addEventListener(MouseEvent.MOUSE_DOWN,draw)
 function draw(){ 

canvas.setPixel(mouseX, mouseY, 0x000000); 
}

Hopefully this isn't too silly of a question - but if someone can guide me through why this wouldn't work or give me a working example (would be even better) I would be very grateful

Solution

  • You have to add the bitmapdata to the displayObject you are on (it should be a sprite)

    private var bitmap:Bitmap;

//on your init function
bitmap = new Bitmap(canvas);
this.addchild(bitmap);

stage.addEventListener(MouseEvent.MOUSE_DOWN,draw)

function draw(e:MouseEvent)
{ 
    bitmap.bitmapdata.setPixel(e.localX, e.localY, 0x000000);
}