As 3.0 effect of fire

2. Package {
4. Import Flash. Geom. matrix;//Color Gradient Class library pour
6. The import Flash.display.sprite;//sprite class is a basic display list building block
8. The Import Flash.display.gradienttype;//graphics class contains a set of methods that you can use to create vector shapes
10. public class Mack_fire extends Sprite {//This class is the Spark prototype class
12. private Var Fire:sprite;
14. var Mymatrix:matrix;
16. Public Function Mack_fire () {
18. Fire = new Sprite ();//Initialize a movie clip
20. Mymatrix = new Matrix ()//need to use the flash with the class, where the role is to make spark particles color gradient effect
22. var boxwidth:int = 16;//Spark particle color gradient width high setting, below is height
24. var boxheight:int = 16;
26. var boxrotation:uint = variable used by math.pi/2;//color gradient
28. var tx:int = Preliminary coordinates of 0;//movie clips
30. var ty:int = 0;
32. Mymatrix.creategradientbox (Boxwidth, Boxheight, Boxrotation, TX, ty);//below starts with the color Pay Value section, please refer to the specific usage of Creategradientbox
34. var type:string = gradienttype.radial;
36. var mycolors:array = [0xffff00, 0xffff00];//color gradient, white to white
38. var myalphas:array = [1, 0];//transparency from, transparent to opaque
40. var myralphas:array = [0, 255];
42. var spreadmethod:string = "pad";
44. var interp:string = "RGB";
46. var focalptratio:number = 0;
48. Fire.graphics.beginGradientFill (Type, Mycolors,myalphas,myralphas, Mymatrix, Spreadmethod, Interp, Focalptratio); Here please refer to the manual for Begingradientfill to understand
50. Fire.graphics.drawCircle (8, 8, 8);//Make a circle, radius and center point coordinates, can refer to Drawcircle
52. AddChild (fire);
54. }
56. }
58. }

Fire.as:

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12. Package {
14. Import Flash.display.MovieClip;
16. Import Flash.events.EventDispatcher;
18. Import flash.events.Event;
20. Import Flash.display.BlendMode;
22. Import Flash.filters.GlowFilter;
24. Import Flash.geom.ColorTransform;
26. public class Fire extends MovieClip {
28. private Var Fires:mack_fire;
30. Private Const MAXBALLS:INT = 60;//Spark Quantity
32. Private Const MC_X:INT = stage.stageheight/2;//start of Fire x coordinates
34. Private Const MC_Y:INT = stage.stageheight/2;//+stage.stageheight/4;//start of fire y-coordinate
36. Private Const MC_MORE:INT = 1;//Vertex, the vertex of movement and transparency, 1 is completely opaque or not scaling,AS3 in 1 as the vertex, AS2 100
38. Private Const MCY:INT = 1;//Move Up speed
40. Private var i=1;//count variable
44. private var obj_scal:array=new array ();//zoom variable Save arrays
46. private var obj_fast:array=new array ();//move speed variable save arrays
48. private var obj_action:array=new Array ();//horizontal Move Speed change variable
52. private var obj_n:array=new Array ();//lateral Movement Direction control variable
54. private var obj_s:array=new Array ();//transverse velocity control variable
56. private var obj_gs:array=new Array ();
60. private var obj_g:array=new Array ();//Color control variable
64. Public Function Fire () {
66. AddEventListener (EVENT.ENTER_FRAME,FIRE_MV);
68. }
72. Public Function FIRE_MV (event:event): void{
74. var k = Math.random ()//Create the number, this variable determines the distance of the spark, has moved the range
76. var scale:number = k? k:1;//creates a random number, which is less than 1, more than 0.
78. fires = new Mack_fire ();
80. Fires.scalex = Fires.scaley = Fires.alpha = scale;//component Scaling and transparency settings, based on the number of seconds above
82. Obj_g[i] = 100;
84. Obj_gs[i] = (1-scale+.2) *3;//defines a new array element, changing the color of the component
86. Obj_fast[i] = Math.floor (scale*2);//longitudinal moving speed main variable
88. Obj_action[i]= (Math.random () >0.5)? 1:-1;//longitudinal moving direction main variable
90. Obj_scal[i] = 1-obj_fast[i]/10;//controls the scaling of the in-process spark
92. Obj_n[i] = obj_s[i] = 1;
94. fires.x= mc_x;//defines the horizontal axis generated by the spark
96. Fires.y= mc_y;//defines the ordinate that sparks produce
98. Fires.blendmode = blendmode.add;//This part is the focus of pure code sparks, color overlay. Make the Sparks and sparks look more sleek. Without this part, the effect of the fire simply does not set
100. Fires.name = "Fire" +i;//defines the name of a spark, which is used below through Getchildbyname. This is a stupid way. Remember that there used to be a friend without definition or use.
102. AddChild (fires);
104. for (var n:int = 1; n<maxballs; ++n) {
106. var m=getchildbyname ("Fire" +n);//Use the Spark movie clip defined above
108. if (m) {
110. var colorinfo:colortransform = m.transform.colortransform;//Define color controller
112. var xx=obj_gs[n]*2;
114. Obj_g[n]-= Math.ceil (XX);
116. if (Obj_g[n] <) obj_g[n]= "00";//change color, this part is why the yellow movie clips turn red for reasons
118. var Rgbs = "0xFF" +obj_g[n]+ "00";//escaped as a string, this Part I do with the stupidest way, really do not understand AS3. Please Master more guidance
120. Colorinfo.color = Rgbs;
122. M.transform.colortransform = Colorinfo;
124. M.Y-= 1-obj_s[n]+.4;//Move Up
126. M.x + = obj_fast[n]*obj_action[n]*obj_n[n]*obj_s[n];//for lateral movement
128. M.scalex + = (Obj_scal[n])/20 * obj_n[n] * obj_s[n];//scaling horizontally
130. M.scaley + = (Obj_scal[n])/20 * obj_n[n] * obj_s[n];//Vertical Scaling
132. M.alpha + + 1 *obj_n[n]*obj_s[n];//for transparency settings
134. if (M.scalex >= mc_more) {;
136. Obj_n[n] = -1;//moving in the opposite direction
138. Obj_s[n] =. 2;//Lateral movement speed slows down
140. };
144. if (M.alpha >= mc_more) {m.alpha = Mc_more;} else if (M.alpha <= math.random () *.1) {Removechildat (m);} If the transparency is higher or lower than the specified value, do the action
146. }
148. }
150. if (i>=maxballs) {i=0;}
152. ++i;
154. }
156. }
158. }

Fire.fla file as a scene file, just import the fire.as file
Specific methods:
In the scene attribute, find the document class and enter fire.