はてなブックマーク

Here is a minimalistic FlashDevelop AS3 project that demonstrates how to use the Molehill API to draw a single 2D sprite on the screen. You can get the project here: fdproject-mole2d.zip. Assuming you have followed the instructions below the result should look like this: Flash: Simple 2D Molehill Example To compile the example you need the Incubator version of the Flash Player, a new FlexSDK (“Her

Trigonometric functions are costly operations and can slow down your application if they are extensively used. There are two reasons why: First, Math.sin() is a function, and thus needs a function call which simple eats up some time. Second, the result is computed with much more precision than you would ever need in most situations. Most often you just want the periodic wave-like characteristics o

First, I have updated the data structures source to version 0.7.3, so make sure you have the latest version. The source code for the SWFs in this post can be obtained here (Flash CS3 required). Using the tree iterator Before we build a tree its important to understand how the tree iterator works. Normally the iterator is used to iterate over the structure’s data – in this case the iterator additio

Collision detection with Recursive Dimensional Clustering Brute force comparison Collision detection can be done in many ways. The most straightforward and simplest way is to just test every object against all other objects. Because every object has to test only for others after it in the list of objects, and testing an object with itself is useless, we arrive at the well known brute force compari

So the main thing to keep in mind is that a for..in loop is now roughly 28 times slower than a standard integer loop - in AS2 the impact wasn't that big. Also don't overload the loop header, but put everything in the loop body instead, for example: // slower var k:int = 1000; for (var j:int = k - 1, i:int = 0; i < k; j = i, i++) { } // faster var k:int = 1000; var j:int = k - 1; for (var i:int = 0