DMIT Fiesta 2008

Flash AS3 Custom Component - parameters

If the parameters are modified during authoring time,
they are not ready til after the constructor is called.


package{
import flash.display.*;
import flash.events.*;
import flash.net.*;
public class Testing extends MovieClip{
[Inspectable]
public var id:Number = 0;
function Testing(){
this.addEventListener(MouseEvent.CLICK, mouseclick);
}
function mouseclick(e:MouseEvent):void{
trace("id" + id);
}
}
}

Elastic Flash Demo

Key in a number from 2-20 in the textbox and click the button to generate an elastic object. Use the mouse to drag the dots.

Microsoft.Win32.OpenFileDialog affect FileIO operation

Just found out that if I use the following code to retrieve a filename, the FileStream will be affected as the current directory will be set to where the filename was taken from, eg.: "My Documents", instead of the Application Path.

OpenFileDialog dialog = new OpenFileDialog();
dialog.Filter = "All files (*.*)|*.*";
if ((bool)dialog.ShowDialog())
{
// store filename
}

// and later in the code
FileStream stream = new FileStream(
"mydata.bin", FileMode.Create);
BinaryWriter writer = new BinaryWriter(stream);
// write some data
stream.Close();
// "mydata.bin" will be saved in the current directory of OpenFileDialog

One solution will be to use the application path and extract the directory:
String path = System.Reflection.Assembly.GetExecutingAssembly().Location;

another will be to use RestoreDirectory property of the OpenFileDialog. set it to true.

Flash 10 3D Demo - partial cube

NOT working. Flash 10 player has been updated to official release.

Requires Flash 10 (currently beta)
http://labs.adobe.com/downloads/flashplayer10.html

Demo of rotating cube(partial to see culling effect):
http://psalmhundred.net/experiment/flash3d/Flash10App.html

Flash 10 3D API - Utils3D.projectVectors(...)

Utils3D.projectVectors(m:Matrix3D, verts:Vector, projectedVerts:Vector, uvts:Vector) causes Flash player 10 beta to crash currently.

so just a workaround, a custom method to do similar thing:

public function projectVectors(projMatrix:Matrix3D, vert:Vector.<Number>,
v2D:Vector.<Number>, uvt:Vector.<Number>):void{

var temp:Vector.<Number> = new Vector.<Number>(vert.length);
projMatrix.transformVectors(vert, temp);
var z:Number = 0;
for(var i:int = 0; i<temp.length/3; i++){
z = temp[i*3+2];
z = focalLength / (focalLength+z);
// x' = f*x/(f+z), y' = f*y/(f+z)
v2D[i*2] = temp[i*3]*z;
v2D[i*2+1] = temp[i*3+1]*z;
// t = f/(f+z)
uvt[i*3+2] = z;
}
}