Flash ActionScript制作真实的火焰

效果如下：

点击这里下载源文件

主要代码：

import flash.display.*;

import flash.filters.*;

import flash.geom.*;

import de.popforge.bitmap.Shape;

Shape.setContainer( this.createEmptyMovieClip( 'shapes', 10000 ) );

//-- get blue circle as a bitmap

var blueSpotClip: MovieClip = attachMovie( "blueSpot", "blueSpotClip", 0 );

var clipBounds: Object = blueSpotClip.getBounds();

var blueSpot: BitmapData = new BitmapData( clipBounds.xMax, clipBounds.yMax, true, 0 );

blueSpot.draw( blueSpotClip, new Matrix() );

blueSpotClip.removeMovieClip();

//-- involved bitmaps

var source: BitmapData = new BitmapData( 256, 256, false, 0 );

var output: BitmapData = new BitmapData( 256, 256, false, 0 );

var buffer: BitmapData = new BitmapData( 256, 256, false, 0 );

var bounds: Rectangle = new Rectangle( 0, 0, 256, 256 );

var origin: Point = new Point();

var matrix: Matrix = new Matrix();

//-- creating a gradient with fire colors

import de.popforge.bitmap.Gradient;

var firePalette: Array = Gradient.fillArray

(

[ 0, 0xA20000, 0xFFF122, 0xFFFFFF, 0xF8FF1B, 0xC53C05, 0 ],

[ 0, 50, 50, 100, 75, 25, 0 ],

[ 0, 64, 132, 186, 220, 250, 255 ]

);

//-- Filter to let the flame grow

var flame: ConvolutionFilter = new ConvolutionFilter( 3, 3, null, 2.7, -2 );

attachBitmap( output, 0, false, false );

var ms: Number = getTimer();

var frame: Number = 0;

onMouseMove = function()

{

//-- create burning area

var mouse: Point = new Point( _xmouse - clipBounds.xMax/2, _ymouse - clipBounds.yMax/2 );

source.copyPixels( blueSpot, new Rectangle( 0, 0, clipBounds.xMax, clipBounds.yMax ), mouse );

}

onEnterFrame = function()

{

//-- create burning area

var mouse: Point = new Point( _xmouse - clipBounds.xMax/2, _ymouse - clipBounds.yMax/2 );

source.copyPixels( blueSpot, new Rectangle( 0, 0, clipBounds.xMax, clipBounds.yMax ), mouse );

//-- the flames matrix with some randoms to expand the flame sidewards

var flameMatrix: Array = [ 0, 0, 0, 0, 0.2, 0, 0, 1.6, 0 ];

flameMatrix[3] = Math.random() * .001;

flameMatrix[5] = Math.random() * .001;

flameMatrix[6] = .4 + Math.random() * .1;

flameMatrix[8] = .4 + Math.random() * .1;

flame.matrix = flameMatrix;

//-- applying the filter 3 times to increase the flame speed

//-- compute the affected region by "generateFilterRect", "getColorBoundsRect"

var area: Rectangle = source.generateFilterRect( source.getColorBoundsRect( 0xFF, 0, false ), flame );

source.applyFilter( source, area, area.topLeft, flame );

area = source.generateFilterRect( area, flame );

source.applyFilter( source, area, area.topLeft, flame );

area = source.generateFilterRect( area, flame );

source.applyFilter( source, area, area.topLeft, flame );

//-- remap the the flame bitmap with fire colors

output.paletteMap( source, area, area.topLeft, null, null, firePalette );

//-- fps

if( getTimer() - 1000 > ms )

{

ms = getTimer();

fps = frame;

fpsDisplay.text = fps.toString();

frame = 0;

}

else

{

frame++;

}

}

var mouseDown: Boolean = false;

onMouseDown = function()

{

mouseDown = true;

}

onMouseUp = function()

{

onEnterFrame();

mouseDown = false;

}

createTextField( "fpsDisplay", 99, 0, 0, 60, 20 );

fpsDisplay.textColor = 0xffffff;

fpsDisplay.selectable = false;

对应的AS代码：Gradient.as

import de.popforge.bitmap.Shape;

import flash.display.BitmapData;

import flash.geom.ColorTransform;

import flash.geom.Matrix;

class de.popforge.bitmap.Gradient

{

public static function createXYGradient(): BitmapData

{

/*

* get canvas

*/

var g: Shape = Shape.get();

if( g == null )

{

return null;

}

var xyGradient: BitmapData = new BitmapData( 256, 256, false, 0 );

var matrix: Matrix = new Matrix();

/*

* create y as blue colorvalues

*/

matrix.createGradientBox( 256, 256, Math.PI/2, 0, 0 );

g.beginGradientFill( 'linear', [ 0, 0x0000ff ], [ 100, 100 ], [ 0, 0xff ], matrix );

g.moveTo( 0, 0 );

g.lineTo( 256, 0 );

g.lineTo( 256, 256 );

g.lineTo( 0, 256 );

g.lineTo( 0, 0 );

g.endFill();

matrix.identity();

xyGradient.draw( g, matrix );

g.clear();

/*

* create x as green colorvalues

*/

matrix.createGradientBox( 256, 256, 0, 0, 0 );

g.beginGradientFill( 'linear', [ 0, 0x00ff00 ], [ 100, 100 ], [ 0, 0xff ], matrix );

g.moveTo( 0, 0 );

g.lineTo( 256, 0 );

g.lineTo( 256, 256 );

g.lineTo( 0, 256 );

g.lineTo( 0, 0 );

g.endFill();

matrix.identity();

xyGradient.draw( g, matrix, null, 'add' );

g.removeMovieClip();

return xyGradient;

}

public static function createDisplacementMapFromMidMap( midmap: BitmapData ): BitmapData

{

var displace: BitmapData = createXYGradient();

if( displace == null )

{

return null;

}

var colorTransform: ColorTransform = new ColorTransform();

var m: Matrix = new Matrix();

colorTransform.greenMultiplier = .5;

colorTransform.blueMultiplier = .5;

displace.draw( displace, m, colorTransform );

colorTransform.greenOffset = 128;

colorTransform.blueOffset = 128;

displace.draw( midmap, m, colorTransform, 'difference' );

return displace;

}

/*

* returns an array with 32bit colorvalues

* usefull to remap a bitmap using 'paletteMap'

*/

public static function fillArray( colors: Ar

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