package tools {
import
flash.display.DisplayObject;
import
flash.events.TimerEvent;
import
flash.utils.Timer;
public
class Earthquake {
private
var _timer:Timer;
private
var _displayObject:DisplayObject;
private
var _originalX:int;
private
var _originalY:int;
private
var _intensity:int;
private
var _intensityOffset:int;
private
var _seconds:Number;
public
static const LEFT_RIGHT_UP_DOWN:int
= 0;
public
static const LEFT_RIGHT:int
= 1;
public
static const UP_DOWN:int
= 2;
public
static const FRAME_RATE:int
= 60;
private
var _direction:int;
private
var _bShaking:Boolean
= false;
private
var _bDestroy:Boolean
= false;
public
function Earthquake(displayObject:DisplayObject, intensity:Number
= 10, seconds:Number
= 1, direction:int
= 0, autoDestroy:Boolean
= false):void
{
_displayObject = displayObject;
_originalX = displayObject.x;
_originalY = displayObject.y;
_intensity = intensity;
_intensityOffset = intensity / 2;
_secOnds= seconds;
_direction = direction;
_bDestroy = autoDestroy;
}
public
function go():void
{
if
(_bShaking) return;
_bShaking = true;
var
msPerUpdate:int
= int(1000
/ FRAME_RATE);
var
totalUpdates:int
= int(_seconds * 1000
/ msPerUpdate);
if
(!_timer)
{
_timer = new
Timer(msPerUpdate, totalUpdates);
_timer.addEventListener(TimerEvent.TIMER, quake);
_timer.addEventListener(TimerEvent.TIMER_COMPLETE, resetImage);
}
else
{
_displayObject.x = _originalX;
_displayObject.y = _originalY;
_timer.reset();
}
_timer.start();
}
private
function quake( event:TimerEvent ):void
{
var
newX:int = _originalX;
var
newY:int = _originalY;
switch(_direction)
{
case
LEFT_RIGHT_UP_DOWN:
newX = _originalX + Math.random() * _intensity - _intensityOffset;
newY = _originalY + Math.random() * _intensity - _intensityOffset;
break;
case
LEFT_RIGHT:
newX = _originalX + Math.random() * _intensity - _intensityOffset;
break;
case
UP_DOWN:
newY = _originalY + Math.random() * _intensity - _intensityOffset;
break;
}
_displayObject.x = newX;
_displayObject.y = newY;
}
private
function resetImage( event:TimerEvent = null
):void
{
_displayObject.x = _originalX;
_displayObject.y = _originalY;
cleanup();
}
private
function cleanup():void
{
_bShaking = false;
_timer.reset();
if
(_bDestroy)
{
_timer.removeEventListener(TimerEvent.TIMER, quake);
_timer.removeEventListener(TimerEvent.TIMER_COMPLETE, resetImage);
_timer = null;
_displayObject = null;
}
delete
[this];
}
}
class="line number141 index140 alt2">}
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