[资料库]用FLASH实现游戏里即时更新,滚动字幕喊话

时间：2010-12-01 来源：咖啡色

http://www.wedoswf.com/questions/1622

这个是我们以前活动的喊话banner，是从 wonderfl上的效果改的。

效果见这里：http://swfsh.com/images/SwfSHBanner_0530.swf

下面是源代码：

代码    1. package
   2. {
   3.     import flash.display.*;
   4.     import flash.events.Event;
   5.     import flash.geom.*;
   6.     import flash.text.*;
   7.

   8.     /**
   9.      * 電光掲示板のテスト
  10.      */
  11.     [SWF(width="550", height="316", backgroundColor="0x000000", frameRate="24")]
  12.     public class Main extends Sprite
  13.     {
  14.         private var panel:Sprite;
  15.         private var data:BitmapData;
  16.         private var frameCount:int;
  17.         private var textField:TextField;
  18.         private var sourceSprite:Sprite;
  19.

  20.         public function Main():void
  21.         {
  22.             if (stage) init();
  23.             else addEventListener(Event.ADDED_TO_STAGE, init);
  24.

  25.                         panel = new Sprite();
  26.                         panel.rotationY = 25;
  27.                         panel.rotationX = 25;
  28.                         panel.y = 50;
  29.                         addChild(panel);
  30.         }
  31.

  32.         private function init(e:Event = null):void
  33.         {
  34.             removeEventListener(Event.ADDED_TO_STAGE, init);
  35.             sourceSprite = new Sprite();
  36.

  37.             textField = new TextField();
  38.             textField.autoSize = TextFieldAutoSize.LEFT;
  39.             textField.height = 20;
  40.             textField.background = true;
  41.             textField.backgroundColor = 0xC0C0C0;
  42.                         textField.selectable = false;
  43.             textField.x = -1;
  44.             textField.y = -2;
  45.             textField.text = "5月30日FLASH专家交流会火热报名中!!! 请访问 WWW.SWFSH.COM";
  46.

  47.             var format:TextFormat = new TextFormat();
  48.             format.color = 0;
  49.             format.size = 14;
  50.                         format.font = "宋体";
  51.             textField.setTextFormat(format);
  52.

  53.             sourceSprite.addChild(textField);
  54.             data = new BitmapData(textField.width, 16);
  55.             data.draw(sourceSprite);
  56.             sourceSprite.removeChild(textField);
  57.             addChild(sourceSprite);
  58.             frameCount = -31;
  59.             addEventListener(Event.ENTER_FRAME, onEnterFrame);
  60.         }
  61.

  62.                 /**
  63.                  * 逐帧绘制
  64.                  */
  65.         private function onEnterFrame(event:Event):void
  66.         {
  67.             frameCount++;
  68.             if (frameCount > data.width)
  69.                 frameCount = -31;
  70.             panel.graphics.clear();
  71.

  72.             for (var y:int = 0; y < 16; y++)
  73.             {
  74.                 for (var x:int = 0; x < 71; x++)
  75.                 {
  76.                     var pixel:uint;
  77.                     if (x + frameCount < 0 || x + frameCount > data.width - 1)
  78.                         pixel = 1;
  79.                     else
  80.                         pixel = data.getPixel(x + frameCount, y);
  81.

  82.                     if (pixel == 0)
  83.                         drawDot(10 + x * 10, 40 + y * 10, 4.5, 0xFF0000, 0x800000);
  84.                     else
  85.                         drawDot(10 + x * 10, 40 + y * 10, 4.5, 0x600000, 0x400000);
  86.                 }
  87.             }
  88.         }
  89.

  90.         /**
  91.          * 具体的描点方法
  92.          * @param    x            点の中心の X 座標
  93.          * @param    y            点の中心の Y 座標
  94.          * @param    size        点の大きさ
  95.          * @param    colorLight    明るい場所の色
  96.          * @param    colorDark    暗い場所の色
  97.          */
  98.         private function drawDot(x:Number, y:Number, size:Number, colorLight:uint, colorDark:uint):void
  99.         {
100.             var colors:Array = [colorLight, colorDark];
101.             var alphas:Array = [1.0, 1.0];
102.             var ratios:Array = [0, 255];
103.             var matrix:Matrix = new Matrix();
104.             matrix.createGradientBox(size * 2,
105.                                      size * 2,
106.                                      0,
107.                                      x - size,
108.                                      y - size);
109.

110.             panel.graphics.lineStyle();
111.             panel.graphics.beginGradientFill(GradientType.RADIAL,
112.                                         colors,
113.                                         alphas,
114.                                         ratios,
115.                                         matrix);
116.             panel.graphics.drawCircle(x, y, size);
117.             panel.graphics.endFill();
118.         }
119.

120.     }
121.

122. }

效果

/Files/4kapple/flash/SwfSHBanner_0530.swf