charlescfenwick.com

I’ve run into this problem a few times I want to rotate and object by an arbitrary point. First off actionscript doesn’t let you change you point from which you rotate when you change the rotation attribute of an object. By default when you rotate using the rotation attribute flash rotates the objects at it’s index point (0, 0). Simple solution move the object so it’s center point is at the index point of it’s container move clip then rotate it, then move it back it’s original position. To make things easier you can of course wrap this up in a function inside of an object or use this snippet.

	function rotate(item:DisplayObject, angle:Number, point:Point) {
		var matrix:Matrix = item.transform.matrix.clone();
		matrix.translate(-point.x, -point.y);
		matrix.rotate (angle*(Math.PI/180));
		matrix.translate(point.x, point.y);
		item.transform.matrix = matrix;
	}

Simple enough to use just pass the function the moveclip you want to rotate the angle just like you would with the rotation attribute and the point from the index point that you want to rotate your clip.

	rotate(thing, 90, new Point(50, 50));

I’ve always wanted to write a flash game. It’s been so intimidating not just the having to learn flash but the how do I make a fun and addictive game. Well the first hurdle I think I’ve gotten over. Recently I’ve had to opportunity to learn flex. It’s kind of like flash, well at least I know actionscript 3 fairly well. So l sat down last week and started playing around with things and let me say all the shit I talked about flash I take it back it’s pretty damn fun to program, like python there is a whole world of things you can do with it. I’ve made some fun little things with papervsion3d which in itself is just freaking amazing so more on that later. After playing with it[papervision] really got to wanting to build a sudo 3Dish flash game, I quickly learned that papervision was probably overkill for what the simple thing I want to do so instead I’ve decided to go with a simple Isometric view game based on sprites. I have no artistic ability. I did get my friend to do some artwork so I can thank him for the grass, dirt and little hut, but until I con someone into doing a whole lot of art for free I went with some free isometric sprites I found here.

So after roughly two days of fleshing out an isometric view type thing I’ve got this.

Click on the flash app then use the arrow keys to move the little dude around. I’m still very far from a game but this is a great start.

Ahhh a sandbox violation if you are stating to pull content from other sites or even pull external content period to your SWF get used to them. They really do suck and at first it is overwhelming when you get them all the time, take it from me though after some time getting your hands dirty with Actionscript these things become a thing of the past.

First up, why do I get these errors?
Easy it’s to protect everyone on out there in the tubes.
These cross domain scripting errors happen because code from one domain is not allowed to modify content from another domain. This is so that say you are browsing your bank’s site doing your normal bank things but at the same time you are also browsing Matt Evilphen’s site. He has some code on there that detects that you are your banking site and transfer all your money to his account, oh no, you’re broke. Well fortunately you cannot do this, oh course there are million other ways to have you bank account drained, this is not one of them.

It’s very strict too. www.charlescfenwick and blog.charlescfenwick.com are not the same and neither is www.charlescfenwick.com:8080

So how does one get around this?
well first off you need a crossdomain.xml file on the server which the remote is being accessed from.

 
<?xml version="1.0"?>
<!DOCTYPE cross-domain-policy SYSTEM "http://www.macromedia.com/xml/dtds/cross-domain-policy.dtd">
<cross-domain-policy>
   <allow-access-from domain="*" />
</cross-domain-policy>

This is an example of course you’ll probably want to change the * to what ever domain the swf is coming from.

then as usual load your content, but take special note of the LoaderContext class

  // don't forget these
  import flash.system.LoaderContext;
  import flash.net.URLLoader;
  import flash.net.URLRequest;
 
  // create your request to the resource
  var request:URLRequest=new URLRequest("http://www.somesite.com/someresource");
  // create the loader to do the actual load
  var loader:URLLoader=new URLLoader();
  // this is the loader context
  var context:LoaderContext = new LoaderContext();
  // set the check policy flag in the loader context
  context.checkPolicyFlag=true;
 
  // add the handler for when the event completes
  loader.addEventListener(Event.COMPLETE, completeHandler);
 
  // retrieve the resource
  loader.load(request, context);