I’ve bookmarked this site. You should too! There are some very useful and helpful tips in there. Like the latest one, as of this writing, about simplifying multiple method calls to a graphic (or any) object.

From this:

mc.graphics.lineStyle(0);
mc.graphics.moveTo(10, 10);
mc.graphics.lineTo(20,10);
//...

To this:

with (mc.graphics) {
    lineStyle(0);
    moveTo(10, 10);
    lineTo(20,10);
    //...
}

Much more readable and easier to type.

Check it out here and bookmark it.

I found this little class that displays the framerate of the current movie and the total memory usage of the Flash Player on your movie. It also shows the version of the player and the operating system you are on. It even has a graph. Very useful for monitoring your experiments or whatever. 

Link.

If anyone knows something better, please let me know. 

It’s been a while since I’ve posted here. Got caught up with exams and projects for school, and a lot of DotA with friends. Now sem-break is here, I  can now just sit around and be bored.

I’ve been playing around with Papervsion lately, and have finally understood how to make it work, albeit only lightly. Here is one of my first attempts with Papervision. It’s just a bunch of spheres, where clicking on one will move the camera to its position, while the camera focuses on the center.

It’s not much. I’m still working on it, but I just wanted to post something here. Check it out. Flash Player 10 is required.

Update: I’ve added a depth of field effect. It’s not very “accurate”, but it’s a nice touch. I don’t know how to do it efficiently, so it might be CPU intensive.

Update 2: I’ve added random movement to the particles.

As always, the source.

Greetings all, still haven’t fixed the PC, and no plans in buying a new one. But, being forced to use a Macbook with no games installed(damn DotA) and a slow connection, I managed to find some time to get back into Flash and ActionScript.

I finally figured out how to setup external class libraries in FlexBuilder, which took longer than I would have hoped. Now I can use Papervision3D, Away3D and have a central library for all other API’s and classes.  It’s not as enjoyable as FlashDevelop, but, it’s better than nothing.

I also started playing with PV3D, which is just awesome. Very fun to play around with, and I can’t wait to make something I could use for my eternally work-in-progress site.

And finally, there’s a new tweening engine on the block. It’s called gTween and it’s made by Grant Skinner, so you know it’s great. Like TweenLite, it aims for speed and it’s also very lightweight. It’s still in beta, and not as powerful and feature-packed as TweenMax or other tweening engines. I haven’t tested it enough to choose it over TweenLite yet, but, I like it’s different approach to creating and managing (yep, you could manage, edit, reuse and even nest) tweens. Check it out here.

And, yeah, I would post my little “experiment” with Papervision, but I can’t seem to extract/find the swf file. I even tried using the .as file as a Document class to a Flash file, but I still can’t double-click and play the movie.

I am also having trouble with FlexBuilder, whenever I Run/Play button to test a project, it often doesn’t show anything until several retries or not at all, but using the .as file as a Doc class to a Flash file, it plays fine. Any help would be very much appreciated.

I did a little experimenting with the BitmapData class, and came up with this.
I found this effect from a gallery somewhere, and thought it would be cool to try my hand at it, for learning purposes.

Click on the image below to see the effect.

What’s happening is, I get the size of the image, divide it by the size of the “pixels” I want, then create an array of Rectangles positioned in a grid over the image.
I then fill each Rectangle with the color of the pixel in it’s center by using the getPixel() and fillRect() methods of the BitmapData class.
Here is the central function doing the pixelating.

private function pixelate(bitmap:Bitmap, strength:Number):void {
var _x:int = 0; // position of the rectangle
var _y:int = 0;
if (strength > 1){
_strength = 1;
}
var _strength:Number = strength; // multiplier for size of "pixels"

var _w:Number = bitmap.bitmapData.width * _strength; //size of "pixels"
var _h:Number = bitmap.bitmapData.height * _strength;

var nH:int = Math.ceil(bitmap.bitmapData.width / _w); // number of rectangles needed horizontally
var nV:int = Math.ceil(bitmap.bitmapData.height / _h);// number of rectangles needed vertically

var rectangles:Array = []; // Rectangles array

//create rectangles
for (var i:int = 0; i < nV; i ++){
var targH:Number = _h;
if (i >= nV - 1){
targH = bitmap.bitmapData.height - _y;
}
for (var j:int = 0; j < nH; j ++){
var targW:Number = _w;
if (j >= nH - 1){
targW = bitmap.bitmapData.width - _x;
}
rectangles.push(new Rectangle(_x, _y, targW, targH));
_x += _w;
}
_x = 0;
_y += _h;

}
//fill in rectangles
for (i = 0; i < rectangles.length; i++){

var rect:Rectangle = rectangles[i];
var pix:uint = _states[0].getPixel((rect.x + rect.width / 2), (rect.y + rect.height / 2));
bitmap.bitmapData.fillRect(rect, pix);
}

saveCurrentState(bitmap.bitmapData);

}

Now for the reverting to the original image part, I had to improvise. Since I overwrote the BitmapData with a bunch of filled rectangles, I couldn’t do much with it.
So I used an array which stores each “state” the BitmapData is in. And I could just retrieve the BitmapData in the array and copy it into the original BitmapData.

private function saveCurrentState(bitmapData:BitmapData):void {
_states.push(bitmapData.clone());
}
private function revertToState(stage:int):void {
try{
bmData.copyPixels(_states[stage], bmData.rect, new Point(bmData.rect.x, bmData.rect.y));
}catch (e:Error){
throw new Error("Invalid state. ");
}
}

To create the animation, I just called the pixelate() function through a Timer at 300 milliseconds.

Just found this great resource for learning AS3. It is a slideshow created by Grant Skinner showing the basics of the language and some optimization tips. Each page worth an article itself, all 167 of them. It not only sounds good, it looks good.

http://gskinner.com/talks/as3workshop/

I want to give a heads-up to all those just beginning with AS3 about how it handles memory. I had to find out about this the hard way, and now have to redo a lot of stuff.

Flash Player 9 introduced a new system management feature called a garbage collector (GC). Basically, what it does is “sweep” for objects that can not be used/accessed anymore, and delete them, freeing memory. Until those ‘null’ objects are removed by the GC, they will sit in memory until the Player is closed.

So, whenever you want something to be deleted (escpecially with CPU intensive particle systems), you must be aware of what and where you are referencing your objects, so you could easily remove them.  You have to do this by hand. One method is to set all objects you want to delete, and all references to it,  to null. Even then, you have to wait for the GC to do its “sweeping motion” for those objects to be deleted.

Another thing to watch out for are event listeners. Make sure you remove any listeners (by calling removeEventListener()) from objects you want to delete, since they also hold a reference to your objects.

Check this article series for more details and info about the GC and resource management in Flash Player 9/AS3.

And lastly, it is about unloading external swf’s through Loader. You might think that using unload() from a Loader would remove that swf completely, but that isn’t the case.  In fact, unload() does a pretty poor job at “unloading” swfs. Here is a quote from another article that explains this in great detail:

In AS3, calling Loader.unload() simply removes the reference to the loaded movie. If any other references exist to the loaded content, it will not be unloaded.

My site has been delayed by almost a month now, trying to figure out and fix my memory leak problem. I finally have an idea of what’s wrong, now I have to figure out a solution.