forked from: forked from: Galaxy (Sandy 3D)

by rainafter 04 Mar 2010

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// forked from Razorblade's forked from: Galaxy (Sandy 3D)
// forked from makc3d's Galaxy (Sandy 3D)
// forked from makc3d's Galaxy (Pixels)
package
{
    import flash.events.Event;
    import flash.filters.GlowFilter;

    import sandy.core.*;
    import sandy.core.data.*;
    import sandy.core.scenegraph.*;
    import sandy.primitive.*;
    import sandy.materials.*;
    import sandy.view.*;

    [SWF (width=465, height=465, backgroundColor=0x0, frameRate=20)]
    public class Galaxy extends BasicView
    {
        private var sf:StarField;

        public function Galaxy()
        {
            super (); init (465, 465);
            camera.z = -100;

            sf = new StarField ();
            rootNode.addChild (sf);

            var stars:Array = [];
            generate (stars); 
            generate (stars);
            generate (stars);
            generate (stars); 
            generate (stars); 
            generate (stars);

            // trying to give central stars more visibility
            // by placing them after other stars (works ??)
            stars.reverse ();

            for each (var obj:Object in stars) {
                sf.stars.push (new Vertex (obj.x, obj.y, obj.z));
                sf.starColors.push (obj.c + 0x1000000 * obj.a);
            }
        
            render ();
            filters = [ new GlowFilter (0x007fff, 0.5, 30, 30, 10) ];
        }

        override public function simpleRender(e:Event = null):void {
            sf.pan += 2; sf.roll += 1; super.simpleRender (e);
        }

        private function generate (stars:Array):void {
            // I wrote this code back in late '90s in TurboPascal
            // By now, I have no idea how it works, and what those magic numbers are :)

            var I:Number, J:Number, K:Number,
            s:Number, L:Number, d:Number, R:Number,
            dX:Number, dY:Number, dZ:Number,
            c2:Number;
            var Rm:Number = 20, A:Number = 0.3;

            var clr:Array = [0x0080FF, 0x8080E4, 0xB0B0FF];

            for (I = 0; I < 101; I++)
            {
                A = A + 0.03;
                R = A * Rm;
                for (J = 0; J < 5 - Math.floor(I / 20); J++)
                {
                    for (K = 0; K < 5; K++)
                    {
                        L = clr[(R > 3 * Rm * Math.random()) ? 0 : 1];
                        c2 = (R > 2 * Rm * Math.random()) ? 1 : 2;
                        if (A < 0.6) L = clr[2];
                        s = Math.max (2, Rm - R / 3);

                        dX = R * Math.cos(A + K * 2 * Math.PI / 5) +
                            0.2 * ((100 - I) * Math.random() + I / 2);
                        dY = R * Math.sin(A + K * 2 * Math.PI / 5) +
                            0.2 * ((100 - I) * Math.random() + I / 2);
                        dZ = s * (Math.random() - Math.random());

                        stars.push ({ x: dX, y: dY, z: dZ, c: L, a: (255 - 120 * c2) });
                    }
                }
                
            }
        }
    }
}