Forked from:: oppei's code on 2008-12-17

forked from: code on 2008-12-17

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2D metaball + bump-map
written by keim +Si+
licence: PD
----------------------------------------

oppei

forked:5
favorite:27
lines:184
license : All rights reserved
modified : 2008-12-17 17:36:20

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//----------------------------------------
// 2D metaball + bump-map
//  written by keim +Si+
//  licence: PD
//----------------------------------------
package {
    import flash.display.*;
    import flash.events.*;
    import flash.geom.*;
    import flash.filters.*;
    import flash.text.*;
    
public class main_bump extends Sprite
    {
        static public  var base:BitmapData;     // base image
        static private var pixels:BitmapData;   // displaying image
        static private var screen:Bitmap;       // displaying image
        static private var balls:Array;         // meta-balls array
	static private var swidth:int=640;
        static private var sheight:int=480;	
           
        static private var ptBallsCenter:Point = new Point();   // balls center position
        static private var matFace:Matrix = new Matrix();       // face matrix
		
        static private var conv:ConvolutionFilter;  // convolution filter for bump
        static private var colt:ColorTransform;     // color matrix for cutout
        
        static private var face:BitmapData;     // face image 
        
        public function main_bump()
        {
            var i:int;
            
            // bitmaps
            base   = new BitmapData(swidth, sheight, false);
            pixels = new BitmapData(swidth, sheight, false);
            screen = new Bitmap(pixels);
            
            // create filter instance
            colt = new ColorTransform(32,4,1.6,1,-1280,-320,-320,0);
            conv = new ConvolutionFilter(3, 3, [-2.5,-2.5,0,-2.5,0,2.5,0,2.5,2.5], 1, 128);
            
            // draw meta-ball gradation
            ball.pat = new BitmapData(ball.R*2,ball.R*2,false,0);
            var shp:Shape = new Shape();
            var mtx:Matrix = new Matrix();
            mtx.createGradientBox(ball.R*2,ball.R*2,0,0);
            shp.graphics.beginGradientFill(GradientType.RADIAL, [0x808080,0x000000], [1,1], [0,255], mtx);
            shp.graphics.drawRect(0,0,ball.R*2,ball.R*2);
            shp.graphics.endFill();
            base.draw(shp);
            base.draw(shp, null, null, BlendMode.MULTIPLY);
            var blr:BlurFilter = new BlurFilter(16, 16);
            ball.pat.applyFilter(base, ball.pat.rect, ball.pat.rect.topLeft, blr);
			
            // draw face
            face = new BitmapData(48, 16, true, 0x00000000);
            var tf:TextField = new TextField();
            tf.width = 48;
            tf.height = 16;
            tf.defaultTextFormat = new TextFormat("MS Gothic", 12, 0x000000, null, null, null, null, null, TextFormatAlign.CENTER);
            tf.text = "+---+";
            face.draw(tf);
            
            // create ball instance
            balls = new Array(16);
            for (i=0; i<balls.length; i++) { balls[i] = new ball(); }
			
            // set sprite/event
            addChild(screen);
            stage.quality   = StageQuality.HIGH;
            stage.scaleMode = StageScaleMode.NO_SCALE;
            stage.align     = StageAlign.TOP_LEFT;
            stage.doubleClickEnabled = true;
            stage.addEventListener(Event.ENTER_FRAME, _onEnterFrame);
            stage.addEventListener(MouseEvent.MOUSE_DOWN, _onMouseDown);
            stage.addEventListener(MouseEvent.MOUSE_UP,   _onMouseUp);
            stage.addEventListener(MouseEvent.DOUBLE_CLICK, _onDoubleClick);
        }
		
        
        private function _onEnterFrame(event:Event) : void
        {
            var i:int, j:int;
            
            // execute
            ball.mouseX = mouseX;
            ball.mouseY = mouseY;
            for (i=0; i<balls.length; i++) { ball(balls[i]).gravity(); }
            for (i=0; i<balls.length-1; i++) for (j=i+1; j<balls.length; j++) { ball(balls[i]).interact(ball(balls[j])); }
				for (i=0; i<balls.length; i++) { ball(balls[i]).run(); }
				calcBallCenter();
            
            // draw
            base.fillRect(pixels.rect,0x000000);
            for (i=0; i<balls.length; i++) { ball(balls[i]).draw(base); }
            pixels.applyFilter(base, pixels.rect, pixels.rect.topLeft, conv);
            base.colorTransform(pixels.rect, colt);
            pixels.draw(base,null,null,BlendMode.MULTIPLY);
            drawFace();
        }
		
        private function _onMouseDown(event:MouseEvent) : void
        {
            for (var i:int=0; i<balls.length; i++) { ball(balls[i]).check_hold(event.localX, event.localY); }
        }
		
        private function _onMouseUp(event:MouseEvent) : void
        {
            for (var i:int=0; i<balls.length; i++) { ball(balls[i]).hold = false; }
        }
        
        private function _onDoubleClick(event:MouseEvent) : void
        {
            for (var i:int=0; i<balls.length; i++) { ball(balls[i]).blast(); }
        }
        
        private function calcBallCenter() : void
        {
            ptBallsCenter.x = 0;
            ptBallsCenter.y = 0;
            for (var i:int=0; i<balls.length; i++) { ptBallsCenter.offset(balls[i].x, balls[i].y); }
            var dv:Number=1/balls.length;
            ptBallsCenter.x *= dv;
            ptBallsCenter.y *= dv;
        }
        
        private function drawFace() : void
        {
            matFace.identity();
            matFace.translate(-24, -8);
            matFace.rotate(Math.atan2(balls[0].y-ptBallsCenter.y, balls[0].x-ptBallsCenter.x));
            matFace.translate(ptBallsCenter.x, ptBallsCenter.y);
            pixels.draw(face, matFace, null, null, null, true);
        }
    }
}

import flash.display.*;
import flash.geom.*;
class ball
{
    static internal var pat:BitmapData;
	
    static internal var R :Number = 48;       // radius
    static internal var K :Number = 0.025;    // spring
    static internal var K2:Number = 0.3;      // dumper
    static internal var D :Number = 48;       // comfortable distance
    static internal var G :Number = 0.8;      // gravity
    static internal var HR:Number = 32*32;    // holding radius ^ 2
    
    internal var mat:Matrix = new Matrix();
    internal var ax:Number = 0;
    internal var ay:Number = 0;
    internal var vx:Number = 0;
    internal var vy:Number = 0;
    internal var x:Number = 0;
    internal var y:Number = 0;
    
    internal var hold:Boolean = false;
    internal var holdX:Number = 0;
    internal var holdY:Number = 0;
    
    static internal var mouseX:Number = 0;
    static internal var mouseY:Number = 0;
    
    function ball() {
        reset();
    }
    
    internal function reset() : void {
        x = Math.random()*R+120;
        y = Math.random()*R;
        vx = 0;
        vy = 0;
        ax = 0;
        ay = 0;
        hold = false;
    }
	
    internal function run() : void {
        if (hold) {
            x = mouseX+holdX;
            y = mouseY+holdY;
        } else {
            x  += vx + ax * 0.5;
            y  += vy + ay * 0.5;
            vx += ax - vx * K2;
            vy += ay - vy * K2;
            if (y>240) { vy=-vy; y=480-y; }
            if (x<0)   { vx=-vx; x=-x; } else 
				if (x>240) { vx=-vx; x=480-x; }
        }
        
        mat.identity();
        mat.translate(x-R, y-R);
    }
    
    internal function draw(base:BitmapData) : void {
        base.draw(pat, mat, null, BlendMode.ADD);
    }
	
    internal function gravity() : void {
        ax = 0;
        ay = G;
    }
    
    internal function interact(b:ball) : void {
        var dx:Number = b.x - x;
        var dy:Number = b.y - y;
        var l:Number = Math.sqrt(dx*dx+dy*dy);
        var f:Number = (D-l)*K/l;
        dx *= f;
        dy *= f;
        ax -= dx;
        ay -= dy;
        b.ax += dx;
        b.ay += dy;
    }
    
    internal function check_hold(x_:Number, y_:Number) : void {
        holdX = x - x_;
        holdY = y - y_;
        if (holdX*holdX+holdY*holdY < HR) { hold = true; }
    }
    
    internal function blast() : void {
        x = Math.random()*240;
        y = Math.random()*240;
    }
}

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