Expanding rings

Click to add a ring (ripple)

forked:1
favorite:4
lines:70
license : see code comments
modified : 2011-11-17 08:20:04

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package {
    import flash.events.MouseEvent;
    import flash.display.Bitmap;
    import flash.display.BitmapData;
    import flash.display.Sprite;
    public class FlashTest extends Sprite {
        public function FlashTest() {
            addChild(new Bitmap(_canvas));
            
            _ripples.add(new Ripple(200, 200, 2));
            
            stage.addEventListener(MouseEvent.MOUSE_DOWN, mD);
        }
        
        private function mD(e:MouseEvent):void {
            _ripples.add(new Ripple(stage.mouseX, stage.mouseY, Math.random()*8));
        }
        
        private var _canvas:BitmapData = new BitmapData(465,465, false, 0x000000);
        private var _ripples:RippleHandler = new RippleHandler(stage, _canvas);
    }
}

import flash.filters.ColorMatrixFilter;
import flash.geom.Point;
import flash.filters.BlurFilter;
import flash.display.BitmapData;

import flash.events.Event;
import flash.display.Stage;

class Ripple {
    public function Ripple(X:int, Y:int, V:Number):void {
        x = X;
        y = Y;
        v = V;
        rad = 0;
    }
    
    public var x:int;
    public var y:int;
    public var rad:Number;
    public var v:Number;
}

class RippleHandler {
    public function RippleHandler(stage:Stage, bmd:BitmapData):void {
        _canvas = bmd;
        stage.addEventListener(Event.ENTER_FRAME, update);
    } 
    
    private var _ripples:Array = [];
    private var _canvas:BitmapData;
    
    public function add(r:Ripple):void {
        _ripples.push(r);
    }
    
    private var bf:BlurFilter = new BlurFilter(4,4,2);
    private var cmf:ColorMatrixFilter = new ColorMatrixFilter(
        [1,0,0,0,0,
         0,1,0,0,0,
         0,0,1,0,0,
         0,0,0,.95,0]
    );
    
    private function update(e:Event):void {
        for each (var r:Ripple in _ripples) {
            r.rad += r.v;
            
            if(r.rad>600)
                _ripples.splice(_ripples.indexOf(r),1);
            
            var n:Number = r.rad*6.28;
            var angle:Number = 0;
            var dA:Number = 2*Math.PI/n;
            
            for(var i:int = 0; i<n; i++) {
                _canvas.setPixel(r.x+Math.cos(angle)*r.rad, r.y+Math.sin(angle)*r.rad, 0xFFFFFF);
                
                angle+=dA;
            }
        }
        
        _canvas.applyFilter(_canvas, _canvas.rect, new Point(0,0), bf);
        _canvas.applyFilter(_canvas, _canvas.rect, new Point(0,0), cmf);
    }
}

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fallen

tjoen

xor

bradsedito

sort

pv0

forked from: Expanding rings

tjoen

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