Smokey fluid

Made using the algorithm here:

http://www.dgp.toronto.edu/people/stam/reality/Research/pdf/GDC03.pdf

Omar.Sameh.S..

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favorite:3
lines:63
license : MIT License
modified : 2012-11-30 16:28:16

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package

{

import flash.display.MovieClip;

import flash.events.Event;

import flash.events.KeyboardEvent;

import flash.events.MouseEvent;

/**

* ...

* @author Omar Shehata

public class FluidMain extends MovieClip

{

var densityGrid:Array;

var boxWidth:int = 5;

var myDT:Number = 0.016667

var mouse:Boolean = false;

public function FluidMain() {

init();

}

function init() {

///Make density grid

densityGrid = [];

for (var i:int = 0; i < stage.stageWidth / boxWidth; i++) {

var arr:Array = [];

for (var j:int = 0; j < stage.stageHeight / boxWidth; j++) {

var b:MovieClip = new MovieClip();

b.graphics.beginFill(0x990000, 1);

b.graphics.drawRect(0, 0, boxWidth, boxWidth);

b.graphics.endFill();

addChild(b); b.x = i * boxWidth;

b.y = j * boxWidth;

b.alpha = 0;

arr.push(b);

b.mouseEnabled = false;

}

densityGrid.push(arr);

}

////////////

addEventListener(Event.ENTER_FRAME, Update);

stage.addEventListener(KeyboardEvent.KEY_DOWN, KeyDown);

stage.addEventListener(MouseEvent.MOUSE_DOWN, mouseDown);

stage.addEventListener(MouseEvent.MOUSE_UP, mouseUp);

}

function Update(event:Event) {

Step(myDT);

}

function KeyDown(event:KeyboardEvent) {

}

function mouseDown(event:MouseEvent) {

mouse = true;

}

function mouseUp(event:MouseEvent) {

mouse = false;

}

function Step(dt) {

var d:Array = densityGrid;

for (var i:int = 1; i < densityGrid.length-1; i++) {

for (var j:int = 1; j < densityGrid[i].length - 1; j++) {

if (mouse == true) {

if (Math.abs(d[i][j].x - mouseX) < boxWidth &&Math.abs(d[i][j].y - mouseY) < boxWidth ) {

d[i][j].alpha = 4;

}

d[i][j].alpha += 10 * dt * (d[i - 1][j].alpha  + d[i + 1][j].alpha  + 2* d[i][j + 1].alpha  - 4 * d[i][j].alpha );

}

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good, omar

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forked from: Smokey fluid

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