沙子物理粒子特效 - 守望者--AIR技术交流

package
{
import com.bit101.components.*;
import flash.display.*;
import flash.events.*;
import flash.geom.*;
import flash.net.navigateToURL;
import flash.net.URLRequest;
import flash.net.URLVariables;
[SWF ( width = 465, height = 465, frameRate = 60 )];
public class Main extends Sprite
{
private var _CANVAS:BitmapData = new BitmapData ( stage.stageWidth , stage.stageHeight , false , 0 ) ;
//宣伝用//////////////////////
private var _S0:PushButton ;
/////////////////////////////
private var _B0:PushButton ;
private var _B1:PushButton ;
private var _B2:PushButton ;
private var _B3:PushButton ;
private var _CLICK:Boolean = false ;
private var _COLOR:uint = 0x836034;
private var _BX:int = 0 ;
private var _BY:int = 0 ;
public function Main():void {
addChild ( new Bitmap ( _CANVAS ) ) ;
//宣伝用////////////////////////////////////////////////////
_S0 = new PushButton ( this, 465-100 , 0, "Ad:kuma-flashgame" ) ;
_S0.addEventListener ( MouseEvent.CLICK , function ():void { var url:URLRequest = new URLRequest ( "http://kuma-flashgame.blogspot.com/" ) ; navigateToURL( url ); } ) ;
//////////////////////////////////////////////////////////
_B0 = new PushButton ( this, 10 , 25, "ERASE" ) ;
_B1 = new PushButton ( this, 120 , 25, "WALL" ) ;
_B2 = new PushButton ( this, 230 , 25, "SAND" ) ;
_B3 = new PushButton ( this, 340 , 25, "WATER" ) ;
_B1.enabled = false ;
_B0.addEventListener ( MouseEvent.CLICK , function ():void { _COLOR = 0x000000 ; _B0.enabled = false ; _B1.enabled = true ; _B2.enabled = true ; _B3.enabled = true ; } ) ;
_B1.addEventListener ( MouseEvent.CLICK , function ():void { _COLOR = 0x836034 ; _B0.enabled = true ; _B1.enabled = false ; _B2.enabled = true ; _B3.enabled = true ; } ) ;
_B2.addEventListener ( MouseEvent.CLICK , function ():void { _COLOR = 0xF7E779 ; _B0.enabled = true ; _B1.enabled = true ; _B2.enabled = false ; _B3.enabled = true ; } ) ;
_B3.addEventListener ( MouseEvent.CLICK , function ():void { _COLOR = 0x80A2F0 ; _B0.enabled = true ; _B1.enabled = true ; _B2.enabled = true ; _B3.enabled = false ; } ) ;
stage.addEventListener ( MouseEvent.MOUSE_DOWN , function ():void { _CLICK = true ; } ) ;
stage.addEventListener ( MouseEvent.MOUSE_UP , function ():void { _CLICK = false; } ) ;
addEventListener ( Event.ENTER_FRAME , RUN ) ;
}
public function RUN ( e:Event ):void {
_CANVAS.lock() ;
////////////////////////////////////
for ( var I:int = 200 ; I < 250 ; ++ I ) {
if ( Math.random() < .1 ) {
_CANVAS.setPixel ( I , 60 , 0xF7E779 ) ;
}
}
////////////////////////////////////
if ( _CLICK && 60 < mouseY && 60 < _BY ) {
for ( var J:int = 0 ; J < 20 ; ++ J ) {
var R:Number = J / 20 ;
_CANVAS.fillRect ( new Rectangle ( _BX * R + mouseX * ( 1 - R ) , _BY * R + mouseY * ( 1 - R ) , 5 , 5 ) , _COLOR ) ;
}
}
_BX = mouseX ;
_BY = mouseY ;
////////////////////////////////////
for ( var X:int = 0 ; X < _CANVAS.width ; ++ X ) {
for ( var Y:int = _CANVAS.height - 1 ; Y >= 0 ; -- Y ) {
var C:uint = _CANVAS.getPixel ( X , Y ) ;
if ( C == 0 ) {
continue ;
}
if ( C == 0xF7E779 ) {
var T:uint ;
var TX:int ;
{//落下
T = _CANVAS.getPixel ( X , Y + 1 ) ;
if ( T == 0 ) {
_CANVAS.setPixel ( X , Y , T ) ;
_CANVAS.setPixel ( X , Y + 1 , C ) ;
continue ;
}
//水より砂の方が重い,適当な確率で場所の置換を許す。
if ( T == 0x80A2F0 && Math.random() < .5 ) {
_CANVAS.setPixel ( X , Y , T ) ;
_CANVAS.setPixel ( X , Y + 1 , C ) ;
continue ;
}
}
{//左右移動
TX = X + Math.floor ( Math.random() * 7 ) - 3 ;
T = _CANVAS.getPixel ( TX , Y ) ;
if ( T == 0 ) {
_CANVAS.setPixel ( X , Y , T ) ;
_CANVAS.setPixel ( TX , Y , C ) ;
continue ;
}
//水より砂の方が重い,適当な確率で場所の置換を許す。
if ( T == 0x80A2F0 && Math.random() < .8 ) {
_CANVAS.setPixel ( X , Y , T ) ;
_CANVAS.setPixel ( TX , Y , C ) ;
continue ;
}
}
}
if ( C == 0x80A2F0 ) {
{//落下
T = _CANVAS.getPixel ( X , Y + 1 ) ;
if ( T == 0 ) {
_CANVAS.setPixel ( X , Y , T ) ;
_CANVAS.setPixel ( X , Y + 1 , C ) ;
continue ;
}
}
{//左右移動
TX = X + Math.floor ( Math.random() * 7 ) - 3 ;
T = _CANVAS.getPixel ( TX , Y ) ;
if ( T == 0 ) {
_CANVAS.setPixel ( X , Y , T ) ;
_CANVAS.setPixel ( TX , Y , C ) ;
continue ;
}
}
}
}
}
_CANVAS.unlock() ;
}
}
}

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