Tag Archives: AS3

ActionScript 3.0

Optimal scrolling for 2D games or UIs

I recently stumbled upon an old bit of code which demonstrates a technique I created for an efficient scrolling data grid on the YouView TV platform. I call it ‘Blit Scrolling’. Below is a demo of the concept (click on the window and use the arrow keys to scroll around):
Continue reading Optimal scrolling for 2D games or UIs

CODING WRONGS – Where do I start with the bad?

It gets scary out there sometimes. During my freelance career I’ve worked at a lot of different companies and have seen such coding horrors as you cannot imagine. So I thought I’d start immortalising some of them – so that we can all learn better coding practices, by looking at the bad.


Starter for 10 – What’s wrong with this picture?

Did you spot the fubar? It’s not an obvious one. Continue reading CODING WRONGS – Where do I start with the bad?

Loan Shark – fast object pooling utility

LoanShark AS3 Object Pooling UtilityA couple of years ago, I created an object pooling utility for a games project I was building in AS3. Since then, I’ve used it quite a few times, in order to speed up apps and improve resource management, easing the load on the garbage collector by reusing objects instead of recreating them. Continue reading Loan Shark – fast object pooling utility

Fastest way to add multiple elements to an Array / Vector

In a simple situation, where you wish to add many elements to an Array or Vector, you might just do:

However, the sizes of both Arrays are manipulated for each loop, which will have an adverse impact on speed and memory usage. So, we could cache the length of the input Array and not manipulate it:

But we’re still growing the size of the output Array incrementally, which is very bad. Since we know input.length in advance, we could grow the output Array to its new size just once, before the loop:

This is OK, but still involves a loop. If only we could push multiple elements into the push method in one go. Well, we can – enter the apply method. Since Array.push accepts multiple arguments (something rarely used) and apply allows us to pass an Array of arguments to any Function, one line and we’re done:

This works out faster and more memory efficient than the other methods. It works nicely for Vectors, too. If anyone has a faster method of doing this, do let me know.