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// forked from FLASHMAFIA's FLUID~MAFIA~+
package {
    import flash.display.Bitmap;
    import flash.display.BitmapData;
    import flash.display.Sprite;
    import flash.events.Event;

[SWF(width='465', height='465')]
    public class GKFluidS01 extends Sprite {
        private const NUM_P : uint = 200 * 100;
        private var ppp : Particle;
        private var grid : Vector.<Vector.<Node>>;
        private var nnn : Node;
        private var bmd : BitmapData;
        private var buf : Vector.<uint>;

function GKFluidS01()
        {
            stage.stageFocusRect = tabChildren = tabEnabled = mouseChildren = mouseEnabled = false;
            stage.scaleMode = 'noScale';
            stage.align = 'TL';
            stage.quality = 'low';
            stage.frameRate = 64;
            opaqueBackground = 0x0;

var bm : Bitmap = new Bitmap(bmd = new BitmapData(512, 512, false, 0x0));
            bm.x = bm.y = (465 - 512) / 2;
            bm.opaqueBackground = 0x0;
            addChild(bm);

buf = new Vector.<uint>(512 * 512, true);

grid = new Vector.<Vector.<Node>>(128, true);

var node : Node;
            var gx : int;
            var gy : int;
            for (gx = 0; gx < 128; gx++) {
                grid[gx] = new Vector.<Node>(128, true);

for (gy = 0; gy < 128; gy++) {
                    if (nnn != null) grid[gx][gy] = node = node.next = new Node();
                    else grid[gx][gy] = node = nnn = new Node();
                }
            }

for (gx = 0; gx < 128 - 2; gx++) {
                for (gy = 0; gy < 128 - 2; gy++) {
                    grid[gx][gy].n10 = grid[gx + 1][gy + 0];
                    grid[gx][gy].n20 = grid[gx + 2][gy + 0];
                    grid[gx][gy].n01 = grid[gx + 0][gy + 1];
                    grid[gx][gy].n11 = grid[gx + 1][gy + 1];
                    grid[gx][gy].n21 = grid[gx + 2][gy + 1];
                    grid[gx][gy].n02 = grid[gx + 0][gy + 2];
                    grid[gx][gy].n12 = grid[gx + 1][gy + 2];
                    grid[gx][gy].n22 = grid[gx + 2][gy + 2];
                }
            }

var p : Particle = ppp = new Particle();

var i : uint = NUM_P;
            while (i-- != 0) {
                var id : uint = (i >> 2) & 3;

if (id == 0) {
                    p.color = 0x0F0804;
                    p.mass = 10.0;
                    p.k = 0.2;
                    p.rd = 1.0;
                    p.gas = false;
                } else if (id == 1) {
                    p.color = 0x8F8884;
                    p.mass = 1.25;
                    p.k = 1.0;
                    p.rd = 1.0;
                    p.gas = false;
                } else if (id == 2) {
                    p.color = 0xCFC8C4;
                    p.mass = 1.50;
                    p.k = 1.0;
                    p.rd = 1.0;
                    p.gas = false;
                } else if (id == 3) {
                    p.color = 0xFFF8F4;
                    p.mass = 1.5;
                    p.gas = true;
                }

p.x = 0.1 + 0.9 * (i & 127);
                p.y = 0.1 + 0.9 * ((i >> 7) & 127);

p.id = id;

p = p.next = new Particle();
            }

stage.addEventListener(Event.ENTER_FRAME, oef);
        }

private function oef(e : Event) : void {
            var mgx : Number = (stage.mouseX / 512) - 0.5;
            var mgy : Number = (stage.mouseY / 512) - 0.5;

var n : Node = nnn;
            while (n != null) {
                if (n.active) {
                    n.m = 0;
                    n.d = 0;
                    n.gx = 0;
                    n.gy = 0;
                    n.u = 0;
                    n.v = 0;
                    n.ax = 0;
                    n.ay = 0;

n.active = false;
                }

n = n.next;
            }

var p : Particle = ppp;
            while (p != null) {
                p.cx = (p.x - 0.5) >> 0;
                p.cy = (p.y - 0.5) >> 0;

var pcx : uint = p.cx;
                var pcy : uint = p.cy;

var d : Number = p.cx - p.x;

p.x0 = 0.5 * d * d + 1.5 * d + 1.125;
                p.gx0 = d + 1.5;

d += 1.0;

p.x1 = -d * d + 0.75;
                p.gx1 = -2.0 * d;

d += 1.0;

p.x2 = 0.5 * d * d - 1.5 * d + 1.125;
                p.gx2 = d - 1.5;

d = p.cy - p.y;

p.y0 = 0.5 * d * d + 1.5 * d + 1.125;
                p.gy0 = d + 1.5;

d += 1.0;

p.y1 = -d * d + 0.75;
                p.gy1 = -2.0 * d;

d += 1.0;

p.y2 = 0.5 * d * d - 1.5 * d + 1.125;
                p.gy2 = d - 1.5;

/* ============================================== */

n = p.node = grid[pcx][pcy];

var n00 : Node = n;
                var n01 : Node = n.n01;
                var n02 : Node = n.n02;
                var n10 : Node = n.n10;
                var n11 : Node = n.n11;
                var n12 : Node = n.n12;
                var n20 : Node = n.n20;
                var n21 : Node = n.n21;
                var n22 : Node = n.n22;

n00.active = true;
                n01.active = true;
                n02.active = true;
                n10.active = true;
                n11.active = true;
                n12.active = true;
                n20.active = true;
                n21.active = true;
                n22.active = true;

p.p00 = p.x0 * p.y0;
                p.p10 = p.x1 * p.y0;
                p.p20 = p.x2 * p.y0;
                p.p01 = p.x0 * p.y1;
                p.p11 = p.x1 * p.y1;
                p.p21 = p.x2 * p.y1;
                p.p02 = p.x0 * p.y2;
                p.p12 = p.x1 * p.y2;
                p.p22 = p.x2 * p.y2;

var pm : Number = p.mass;

n00.m += p.p00 * pm;
                n00.d += p.p00;
                n00.gx += p.gx0 * p.y0;
                n00.gy += p.x0 * p.gy0;

n10.m += p.p10 * pm;
                n10.d += p.p10;
                n10.gx += p.gx1 * p.y0;
                n10.gy += p.x1 * p.gy0;

n20.m += p.p20 * pm;
                n20.d += p.p20;
                n20.gx += p.gx2 * p.y0;
                n20.gy += p.x2 * p.gy0;

n01.m += p.p01 * pm;
                n01.d += p.p01;
                n01.gx += p.gx0 * p.y1;
                n01.gy += p.x0 * p.gy1;

n11.m += p.p11 * pm;
                n11.d += p.p11;
                n11.gx += p.gx1 * p.y1;
                n11.gy += p.x1 * p.gy1;

n21.m += p.p21 * pm;
                n21.d += p.p21;
                n21.gx += p.gx2 * p.y1;
                n21.gy += p.x2 * p.gy1;

n02.m += p.p02 * pm;
                n02.d += p.p02;
                n02.gx += p.gx0 * p.y2;
                n02.gy += p.x0 * p.gy2;

n12.m += p.p12 * pm;
                n12.d += p.p12;
                n12.gx += p.gx1 * p.y2;
                n12.gy += p.x1 * p.gy2;

n22.m += p.p22 * pm;
                n22.d += p.p22;
                n22.gx += p.gx2 * p.y2;
                n22.gy += p.x2 * p.gy2;

/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - PRESSURE */

var pressure : Number;

if (p.gas == false) {
                    d = n10.d - n00.d;

var C20 : Number = 3.0 * d - n10.gx - 2.0 * n00.gx;
                    var C30 : Number = -2.0 * d + n10.gx + n00.gx;

d = n01.d - n00.d;

var C02 : Number = 3.0 * d - n01.gy - 2.0 * n00.gy;
                    var C03 : Number = -2.0 * d + n01.gy + n00.gy;

var csum1 : Number = n00.d + n00.gy + C02 + C03;
                    var csum2 : Number = n00.d + n00.gx + C20 + C30;

var C21 : Number = 3.0 * n11.d - 2.0 * n01.gx - n11.gx - 3.0 * csum1 - C20;
                    var C31 : Number = -2.0 * n11.d + n01.gx + n11.gx + 2.0 * csum1 - C30;
                    var C12 : Number = 3.0 * n11.d - 2.0 * n10.gy - n11.gy - 3.0 * csum2 - C02;
                    var C13 : Number = -2.0 * n11.d + n10.gy + n11.gy + 2.0 * csum2 - C03;
                    var C11 : Number = n01.gx - C13 - C12 - n00.gx;

var u : Number = p.x - pcx;
                    var u2 : Number = u * u;
                    var u3 : Number = u * u2;

var v : Number = p.y - pcy;
                    var v2 : Number = v * v;
                    var v3 : Number = v * v2;

var density : Number = n00.d + n00.gx * u + n00.gy * v + C20 * u2 + C02 * v2 + C30 * u3 + C03 * v3 + C21 * u2 * v + C31 * u3 * v + C12 * u * v2 + C13 * u * v3 + C11 * u * v;

pressure = p.k * (density - p.rd);
                    if (pressure > 2.0) pressure = 2.0;

pressure *= pm;
                } else {
                    pressure = 1.9;
                }

/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */

var fx : Number = 0.0;
                var fy : Number = 0.0;

if (p.x < 8) fx = pm * (8 - p.x);
                else if (p.x > 128 - 8) fx = pm * (128 - 8 - p.x);

if (p.y < 8) fy = pm * (8 - p.y);
                else if (p.y > 128 - 8) fy = pm * (128 - 8 - p.y);

/* - - - - - - - - - - - - - - - - - - - - - - - - - - - CURVATURE */

var phi : Number = p.x0 * p.y0;
                var dx : Number = p.gx0 * p.y0;
                var dy : Number = p.x0 * p.gy0;

n00.ax += -(dx * pressure) + fx * phi;
                n00.ay += -(dy * pressure) + fy * phi;

phi = (p.x0 * p.y1);
                n01.ax += -((p.gx0 * p.y1) * pressure) + fx * phi;
                n01.ay += -((p.x0 * p.gy1) * pressure) + fy * phi;

phi = (p.x0 * p.y2);
                n02.ax += -((p.gx0 * p.y2) * pressure) + fx * phi;
                n02.ay += -((p.x0 * p.gy2) * pressure) + fy * phi;

phi = (p.x1 * p.y0);
                n10.ax += -((p.gx1 * p.y0) * pressure) + fx * phi;
                n10.ay += -((p.x1 * p.gy0) * pressure) + fy * phi;

phi = (p.x1 * p.y1);
                n11.ax += -((p.gx1 * p.y1) * pressure) + fx * phi;
                n11.ay += -((p.x1 * p.gy1) * pressure) + fy * phi;

phi = (p.x1 * p.y2);
                n12.ax += -((p.gx1 * p.y2) * pressure) + fx * phi;
                n12.ay += -((p.x1 * p.gy2) * pressure) + fy * phi;

phi = (p.x2 * p.y0);
                n20.ax += -((p.gx2 * p.y0) * pressure) + fx * phi;
                n20.ay += -((p.x2 * p.gy0) * pressure) + fy * phi;

phi = (p.x2 * p.y1);
                n21.ax += -((p.gx2 * p.y1) * pressure) + fx * phi;
                n21.ay += -((p.x2 * p.gy1) * pressure) + fy * phi;

phi = (p.x2 * p.y2);
                n22.ax += -((p.gx2 * p.y2) * pressure) + fx * phi;
                n22.ay += -((p.x2 * p.gy2) * pressure) + fy * phi;

p = p.next;
            }

/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */

var gravX : Number = 0.11 * mgx;
            var gravY : Number = 0.11 * mgy;

n = nnn;
            while (n != null) {
                if (n.active == true) {
                    n.ax /= n.m;
                    n.ay /= n.m;
                    n.ax += gravX;
                    n.ay += gravY;
                }

n = n.next;
            }

/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */

p = ppp;
            while (p != null) {
                n = p.node;

n00 = n;
                n01 = n.n01;
                n02 = n.n02;
                n10 = n.n10;
                n11 = n.n11;
                n12 = n.n12;
                n20 = n.n20;
                n21 = n.n21;
                n22 = n.n22;

p.u += (p.p00 * n00.ax + p.p10 * n10.ax + p.p20 * n20.ax + p.p01 * n01.ax + p.p11 * n11.ax + p.p21 * n21.ax + p.p02 * n02.ax + p.p12 * n12.ax + p.p22 * n22.ax);
                p.v += (p.p00 * n00.ay + p.p10 * n10.ay + p.p20 * n20.ay + p.p01 * n01.ay + p.p11 * n11.ay + p.p21 * n21.ay + p.p02 * n02.ay + p.p12 * n12.ay + p.p22 * n22.ay);

var mu : Number = p.mass * p.u;
                var mv : Number = p.mass * p.v;

n00.u += p.p00 * mu;
                n00.v += p.p00 * mv;
                n10.u += p.p10 * mu;
                n10.v += p.p10 * mv;
                n20.u += p.p20 * mu;
                n20.v += p.p20 * mv;
                n01.u += p.p01 * mu;
                n01.v += p.p01 * mv;
                n11.u += p.p11 * mu;
                n11.v += p.p11 * mv;
                n21.u += p.p21 * mu;
                n21.v += p.p21 * mv;
                n02.u += p.p02 * mu;
                n02.v += p.p02 * mv;
                n12.u += p.p12 * mu;
                n12.v += p.p12 * mv;
                n22.u += p.p22 * mu;
                n22.v += p.p22 * mv;

p = p.next;
            }

/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */

n = nnn;
            while (n != null) {
                if (n.active == true) {
                    n.u /= n.m;
                    n.v /= n.m;
                }

n = n.next;
            }

/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */

var buf : Vector.<uint> = this.buf;
            var pos : uint = buf.length;
            while (pos--) buf[pos] = 0x5F5854;

p = ppp;
            while (p != null)//
            {
                n = p.node;

var gu : Number = p.p00 * n.u + p.p10 * n.n10.u + p.p20 * n.n20.u + p.p01 * n.n01.u + p.p11 * n.n11.u + p.p21 * n.n21.u + p.p02 * n.n02.u + p.p12 * n.n12.u + p.p22 * n.n22.u;
                var gv : Number = p.p00 * n.v + p.p10 * n.n10.v + p.p20 * n.n20.v + p.p01 * n.n01.v + p.p11 * n.n11.v + p.p21 * n.n21.v + p.p02 * n.n02.v + p.p12 * n.n12.v + p.p22 * n.n22.v;

p.x += gu;
                p.y += gv;
                p.u += gu - p.u;
                p.v += gv - p.v;

if (p.x < 2) {
                    p.x = 2.2;
                    p.u = 0.0;
                } else if (p.x > (128 - 2)) {
                    p.x = 128 - 2.2;
                    p.u = 0.0;
                }

if (p.y < 2) {
                    p.y = 2.2;
                    p.v = 0.0;
                } else if (p.y > (128 - 2)) {
                    p.y = 128 - 2.2;
                    p.v = 0.0;
                }

/* draw */

var c : uint = p.color;

var px0 : uint = (p.x * 4) >> 0;
                var py0 : uint = (p.y * 4) >> 0;

var px1 : uint = ((p.x - p.u) * 4) >> 0;
                var py1 : uint = ((p.y - p.v) * 4) >> 0;

var pos0 : uint = px0 + (py0 << 9);
                var pos1 : uint = ((px0 + px1) >> 1) + (((py0 + py1) >> 1) << 9);
                var pos2 : uint = px1 + (py1 << 9);

buf[pos0] = c;
                buf[(pos0 - 1) & 262143] = c;
                buf[(pos0 + 1) & 262143] = c;
                buf[(pos0 + 512) & 262143] = c;
                buf[(pos0 - 512) & 262143] = c;

buf[pos1] = c;
                buf[pos2] = c;

p = p.next;
            }

bmd.setVector(bmd.rect, buf);
        }
    }
}

internal class Node {
    public var next : Node;
    public var m : Number = 0;
    public var d : Number = 0;
    public var gx : Number = 0;
    public var gy : Number = 0;
    public var u : Number = 0;
    public var v : Number = 0;
    public var ax : Number = 0;
    public var ay : Number = 0;
    public var active : Boolean;
    public var n10 : Node;
    public var n20 : Node;
    public var n01 : Node;
    public var n11 : Node;
    public var n21 : Node;
    public var n02 : Node;
    public var n12 : Node;
    public var n22 : Node;

function Node() {
    }
}

internal class Particle {
    public var next : Particle;
    public var node : Node;
    public var id : uint;
    public var color : uint = 0x0000FF;
    public var mass : Number;
    public var rd : Number;
    public var k : Number;
    public var gas : Boolean;
    public var cx : uint;
    public var cy : uint;
    public var x : Number = 0.0;
    public var y : Number = 0.0;
    public var u : Number = 0.0;
    public var v : Number = 0.0;
    public var gx0 : Number;
    public var gx1 : Number;
    public var gx2 : Number;
    public var gy0 : Number;
    public var gy1 : Number;
    public var gy2 : Number;
    public var x0 : Number;
    public var x1 : Number;
    public var x2 : Number;
    public var y0 : Number;
    public var y1 : Number;
    public var y2 : Number;
    public var p00 : Number;
    public var p10 : Number;
    public var p20 : Number;
    public var p01 : Number;
    public var p11 : Number;
    public var p21 : Number;
    public var p02 : Number;
    public var p12 : Number;
    public var p22 : Number;

function Particle() {
    }
}

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