Archive for March 2009

SimpleOscilloscope : filter update

My SimpleOscilloscope component described in an earlier post has now been updated to include a few filters controllable through setting styles. Of course like any other Flex component, it can have additional filtering applied in the normal way. I just felt like including these : alphaDecay, redMultiplier, greenMultiplier, blueMultiplier, blurX, blurY, scrollX, scrollY.

As ever, the project is on google code, and the test bed is here.

SimpleOscilloscope snapshot - with filters

flash.display.BitmapData gotcha – well gotme for a while

The documentation is correct, so i have no excuse, but I didn’t initially read much beyond the signature of the constructor…

public function BitmapData(width:int, height:int, transparent:Boolean = true, fillColor:uint = 0xFFFFFFFF)

I needed a transparent bitmap. Reading the default “transparent:Boolean = true”, I assumed by simply supplying width and height, a transparent bitmap is what I would get. Not so! I got a white rectangle. The reason being, that the default fill colour is 100% white. (The first pair of FFs representing the alpha in ARGB).

At first it would seem slightly unintuitive for the second default to conflict with the first, until one realises that the ‘transparent’ flag is there to indicate whether the object will support transparency or not. Not to state that it should be initially created transparent. Supporting transparency increases data size from 24 bits per pixel to 32 bits per pixel.

So what i should have done :

bmd = new BitmapData( width, height, true, 0 );

couple of user group events (LFPUG)

26 March 2009

Looking forward to this slight departue from the usual subjects at LFPUG into the world of iPhone/iPodTouch development.  I have my development kit but not got around to using it yet…

  • An Introduction to iPhone Application Development
  • iPhone Development for Web Developers

30 April 2009

Some interesting 3D flash stuff. I have prior engagement to see Ultravox for the first time since 1986 which will keep me away from this one. So I will be relying on the video recording of the session.

  • Papervision3D, Simplified
  • We Make. You Enjoy

SimpleOscilloscope : my first opensource Flex component

In the majority of my projects to-date, I am the sole developer on the project team. I was feeling the need to get into writing Flex components to a level that they could be distributed. Essentially making sure I use meta tags correctly and adding appropriate asdoc comments allowing other Flex developers to easily include the component as they would any other from the Flex SDK.

SimpleOscilloscope snapshot

So, ccglib is an MIT license OpenSource project hosted on google code through which i plan to release a number of components. The first component released is SimpleOscilloscope, which plots the currently playing sound-wave. Designed to be easily sized, coloured and positioned through application of styles.