Simple plotting program implemented by event

Package ...{
/**//**
* Simple plotting program implemented by event
*
**/
Import flash. display. Sprite;
Import flash. display. stagescalemode;
Import flash. display. stagealign;
Import flash. Events. mouseevent;

Import flash. Events. keyboardevent;
Import flash. Text. textfield;
Import flash. system. system;
Import flash. system. capabilities;
Import flash.net. filereference;

Public class asproject extends Sprite
...{
Private VaR _ sprite: SPRITE;
Public Function asproject ()
...{

Initialize ();
Showinfo ();
Stage. scalemode = stagescalemode. no_scale;
Stage. align = stagealign. top_right;
Stage. showdefaconcontextmenu = false;

Graphics. beginfill (0 xffffff );
Graphics. drawrect (0, 0, stage. stagewidth, stage. stageheight );
Graphics. endfill ();

/** // * Browse local files */
VaR filereference: filereference = new filereference ();
Filereference. Browse ();
}

Public Function showinfo (): void
...{
/** // * Display local system information */
VaR TXT: textfield = new textfield ();
VaR osinfo: String = "OS:" + capabilities. OS;
TXT. Text = osinfo;
Addchild (txt );
TXT. appendtext ("version:" + capabilities. Version + "language:" + capabilities. Language
+ "Manufacturer:" + capabilities. Manufacturer );

}
Public Function initialize (): void
...{
Stage. Focus = this;
Addeventlistener (keyboardevent. key_down, onkeydown );
_ Sprite = new sprite ();
Addchild (_ sprite );
}

Public Function draw (): void
...{
_ Sprite. Graphics. beginfill (0 xffffff );
_ Sprite. Graphics. drawrect (0, 0, 400,400 );
_ Sprite. Graphics. endfill ();
_ Sprite. addeventlistener (mouseevent. mouse_down, onmousedown );
_ Sprite. addeventlistener (mouseevent. mouse_up, onmouseup );

}
/**//*
Private function onenterframe (Event: Event): void
{
Graphics. lineto (math. Random () * 400, math. Random () * 400 );
}
*/
Private function onkeydown (Event: keyboardevent): void
...{
Trace ("key down:" + event. charcode );
}
Private function onmousedown (Event: mouseevent): void
...{
_ Sprite. Graphics. linestyle (1, 0, 1 );
_ Sprite. Graphics. moveTo (mousex, Mousey );
_ Sprite. addeventlistener (mouseevent. mouse_move, onmousemove );

}
Private function onmousemove (Event: mouseevent): void
...{
_ Sprite. Graphics. lineto (mousex, Mousey );

}
Private function onmouseup (Event: mouseevent): void
...{
_ Sprite. removeeventlistener (mouseevent. mouse_move, onmousemove );
}
}
}