ウロコ型

by aaaaaz025 29 Jan 2011
Tags

弾幕制作
Embed
/**
 * Copyright aaaaaz025 ( http://wonderfl.net/user/aaaaaz025 )
 * MIT License ( http://www.opensource.org/licenses/mit-license.php )
 * Downloaded from: http://wonderfl.net/c/kNT7
 */

// forked from kihon's flash on 2010-4-23
package
{
    import flash.display.Bitmap;
    import flash.display.BitmapData;
    import flash.display.Loader;
    import flash.display.Sprite;
    import flash.events.Event;
    import flash.geom.Matrix;
    import flash.geom.Point;
    import flash.net.URLRequest;
    import flash.system.LoaderContext;
    
    public class Main extends Sprite
    {
        private var bullets:Vector.<Bullet> = new Vector.<Bullet>();
        private var images:Array = new Array();
        private var canvas:BitmapData;
        private var frame:int = 0;
        
        public function Main()
        {        
            canvas = new BitmapData(stage.stageWidth, stage.stageHeight, false, 0x0);
            addChild(new Bitmap(canvas));
            
            var loader:Loader = new Loader();
            loader.contentLoaderInfo.addEventListener(Event.INIT, initHandler);
            loader.load(new URLRequest("http://assets.wonderfl.net/images/related_images/e/ee/ee9f/ee9f19360d9569ddcf91bc571f71488f3beb6840"), new LoaderContext(true));
        }
        
        private function initHandler(event:Event):void 
        {
            var loader:Loader = event.currentTarget.loader;
            
            for (var i:int = 0; i < 360; i++)
            {
                var matrix:Matrix = new Matrix();
                matrix.tx = -loader.width / 2;
                matrix.ty = -loader.height / 2;
                matrix.rotate(i * Math.PI / 180);
                matrix.tx += loader.width / 2;
                matrix.ty += loader.height / 2;
                
                var image:BitmapData = new BitmapData(loader.width, loader.height, false, 0x0);
                image.draw(loader, matrix);
                images.push(image);
            }
            
            addEventListener(Event.ENTER_FRAME, onEnterFrame);
        }
        
        private function onEnterFrame(event:Event):void 
        {
            if (frame++ % 2 == 0)
            {
                var degree:int = Math.random() * 360;
                var tx:Number = 232 + Math.random() * 20 - 10;
                var ty:Number = 140 + Math.random() * 20 - 10;
                for (var d:int = degree; d < degree + 240; d += 10)
                {
                    var bullet:Bullet = new Bullet();
                    bullet.x = tx;
                    bullet.y = ty;
                    bullet.rotate = d % 360;
                    bullet.tx = Math.cos(d * Math.PI / 180) * 5;
                    bullet.ty = Math.sin(d * Math.PI / 180) * 5;
                    bullets.push(bullet);
                }
            }
            canvas.fillRect(canvas.rect, 0x0);
            for (var i:int = 0; i < bullets.length; i++)
            {
                var b:Bullet = bullets[i];
                b.x += b.tx;
                b.y += b.ty;

                canvas.copyPixels(images[b.rotate], images[b.rotate].rect, new Point(b.x, b.y));

                if (b.x < -30 || 480 < b.x ||
                    b.y < -30 || 480 < b.y) bullets.splice(i--, 1);
            }
        }
    }
}

class Bullet
{
    public var x:Number;
    public var y:Number;
    
    public var tx:Number;
    public var ty:Number;
    
    public var rotate:int;
}