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              <canvas id="renderCanvas"></canvas>
            
          
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              html, body {
  margin: 0;
  height: 100%;
  overflow: hidden;
}
#renderCanvas{
  position:absolute
}
            
          
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              //==============::MathUtil::=================
(function (){

    window.MathUtil = {};

    MathUtil.PI2 = Math.PI * 2;

    //return number between 1 and 0
    MathUtil.normalize = function(value, min, max){
        return (value - min) / (max - min);
    };

    //map normalized number to values
    MathUtil.interpolate = function(normal, min, max){
        return min + (max - min) * normal;
    };

    //map a value from one set to another
    MathUtil.map = function(value, min1, max1, min2, max2){
        return MathUtil.interpolate( MathUtil.normalize(value, min1, max1), min2, max2);
    };

    //https://github.com/gre/smoothstep/blob/master/index.js
    MathUtil.smoothstep = function(value, min, max) {
        var x = Math.max(0, Math.min(1, (value - min) / (max - min)));
        return x * x * (3 - 2 * x);
    };

    MathUtil.clamp = function(value, min, max){
        return Math.max(min, Math.min(value, max));
    };

    MathUtil.getRandomNumberInRange = function(min, max){
        return min + Math.random() * (max - min);
    };

}());

//==============::Rectangle::===============
(function (){

    window.Rectangle = function(x, y, width, height) {

        this.update = function(x, y, width, height){
            this.x = x;
            this.y = y;
            this.width = width;
            this.height = height;
        };

        this.inflate = function(value){
            this.update(this.x - value, this.y - value, this.width + value * 2, this.height + value * 2);
        };

        this.updateToRect = function(rect){
            this.update(rect.x, rect.y, rect.width, rect.height);
        };

        this.right = function(){
            return this.x + this.width;
        };

        this.bottom = function(){
            return this.y + this.height;
        };

        this.centerX = function(){
            return this.x + this.width / 2;
        };

        this.centerY = function(){
            return this.y + this.height / 2;
        };

        this.containsPoint = function(x, y){
            return x >= this.x && y >= this.y && x <= this.right() && y <= this.bottom();
        };

        this.isLandscape = function(){
            return this.width > this.height;
        };

        this.isPortrait = function(){
            return !this.isLandscape();
        };

        this.smallerSide = function(){
            return Math.min(this.width, this.height);
        };

        this.biggerSide = function(){
            return Math.max(this.width, this.height);
        };

        this.toString = function(){
            return "Rectangle{x:"+this.x+" , y:"+this.y+" , width:"+this.width+" , height:"+this.height+"}";
        };

        this.update(isNaN(x) ? 0 : x, isNaN(y) ? 0 : y, isNaN(width) ? 0 : width, isNaN(height) ? 0 : height);

    };

}());

//==============::UNIT EASING::===============
(function (){

  var halfPi = Math.PI/2;
    /*
     * From : https://gist.github.com/gre/1650294
     * only considering the t value for the range [0, 1] => [0, 1]
     */
    window.UnitEasing = {
        easeInSine: function (t) { return 1 + Math.sin(halfPi * t - halfPi) },
        easeOutSine : function (t) { return Math.sin(halfPi * t) },
        easeInOutSine: function (t) { return (1 + Math.sin(Math.PI * t - halfPi)) / 2;},
    };

}());

//==============::UNIT ANIMATOR::===============
(function (){

    window.UnitAnimator = function() {

        //PRIVATE VARIABLES

        var _duration,
            _animating = true,
            _animationStart,
            _millisecondsAnimated,
            _updateCallBack,
            _completeCallBack,
            _easingFunction;

        //PUBPLIC API

        this.start = function(durationMS, updateCallBack, completeCallBack, easingFunction){
            _duration = durationMS;
            _updateCallBack = updateCallBack;
            _completeCallBack = completeCallBack;
            _easingFunction = easingFunction || UnitEasing.easeLinear;//optional, sets default
            _animating = true;
            _animationStart = Date.now();
            _millisecondsAnimated = 0;//keeps track of how long the animation has been running
            loop();
        };

        this.stop = function(){
            _animating = false;
        };

        this.isAnimating = function(){
            return _animating === true;
        };

        //PRIVATE METHODS

        var dispatchUpdate = function(){
            _updateCallBack( _easingFunction(MathUtil.normalize(_millisecondsAnimated, 0, _duration)) );
        };

        var dispatchComplete = function(){
            dispatchUpdate();
            if(_completeCallBack){
                _completeCallBack();
            }
        };

        var loop = function(){
            if(!_animating){
                return;
            }
            _millisecondsAnimated = Date.now() - _animationStart;
            if(_millisecondsAnimated >= _duration){
                _animating = false;
                _millisecondsAnimated = _duration;
                dispatchComplete();
                return;
            }
            dispatchUpdate();
            requestAnimationFrame(loop);
        };

    };
}());


(function() {
  
    window.GridArray = function(){

        //private properties
        var _rows = 0, _cols = 0;

        //public properties
        this.array = [];

        //public API
        this.init = function(rows, cols){
            this.array.length = 0;
            _rows = rows || 10;
            _cols = cols || 10;
        };

        this.getRows = function(){
            return _rows;
        };

        this.getCols = function(){
            return _cols;
        };

        this.getSize = function(){
            return _rows * _cols;
        };

        this.getGridIndex = function(row, col){
            return row * _cols + col;
        };

        this.getRowForIndex = function(index){
            return Math.floor(index / _cols);
        };

        this.getColForIndex = function(index){
            return index % _cols;
        };

        this.isValidCol = function(col){
            return col > -1 && col < _cols;
        };

        this.isValidRow = function(row){
            return row > -1 && row < _rows;
        };

        this.isValidRowCol = function(row, col){
            return this.isValidRow(row) && this.isValidCol(col);
        };

        this.isValidIndex = function(index){
            return index > -1 && index < this.getSize();
        };

    };

}());

(function() {

    window.GridArrayScanner = {};

    //private variables
    var _scanRow = 0,
        _scanCol = 0,
        _scanRules,
        _scanRulesCW = [{x:0, y:1}, {x:-1, y:0},{x:0, y:-1},{x:1, y:0}],
        _scanRulesCC = [{x:0, y:-1}, {x:-1, y:0},{x:0, y:1},{x:1, y:0}],
        _maxScanOffset = 0;

    //public API
    GridArrayScanner.searchSurroundingCells = function(gridArray, index, compareFunction, counterClockwise){

        _scanRules = counterClockwise ? _scanRulesCC : _scanRulesCW;
        _scanRow = gridArray.getRowForIndex(index);
        _scanCol = gridArray.getColForIndex(index);

        _maxScanOffset = Math.max(
            _scanRow,
            _scanCol,
            gridArray.getRows() - _scanRow,
            gridArray.getCols() - _scanCol
        );
        return surroundSearch(gridArray, index, 2, compareFunction);
    };

    var surroundSearch = function(grid, index, offset, compareFunction){
        if(offset > _maxScanOffset){
            console.log("---> boo hoo, didn't find it?", offset);
            return -1;
        }
        _scanRow = grid.getRowForIndex(index);
        _scanCol = grid.getColForIndex(index);
        var startOffset = Math.floor(offset * .5);
        _scanRow -= startOffset * _scanRules[0].y;
        _scanCol += startOffset;
        var total = offset * 4, scan, i, found;
        for(i=0; i < total; i++){
            scan = _scanRules[Math.floor(i / offset)];
            _scanRow += scan.y;
            _scanCol += scan.x;
            if(grid.isValidRowCol(_scanRow, _scanCol)){
                found = grid.getGridIndex(_scanRow, _scanCol);
                if(compareFunction(grid.array[found])){
                    return grid.array[found];
                }
            }
        }
        return surroundSearch(grid, index, offset + 2, compareFunction);
    };

}());



(function() {

    window.EggFactory = {};

    EggFactory.getRandomRadiusEggPoints = function(bounds, numPoints, minRadiusNormal){
        minRadiusNormal = minRadiusNormal || .1;
        minRadiusNormal = MathUtil.clamp(minRadiusNormal, .1, .99);
        var i, topHeight = Math.floor(bounds.height * .666),
            bottomHeight = Math.floor(bounds.height - topHeight),
            points = [], radian,
            increment = MathUtil.PI2 / numPoints,
            halfWidth = Math.floor(bounds.width * .5),
            center = {x : Math.floor(bounds.centerX()), y: Math.floor(bounds.y + topHeight)},
            minXRadius = Math.floor(halfWidth * minRadiusNormal),
            maxXRadius = halfWidth - minXRadius,
            minYRadius, maxYRadius, radiusNormal;
        for(i=0; i < numPoints; i++){
            radian = i * increment;
            radiusNormal = Math.random();
            if(radian < Math.PI) {
                minYRadius = bottomHeight * minRadiusNormal;
                maxYRadius = bottomHeight;
            }else{
                minYRadius = topHeight * minRadiusNormal;
                maxYRadius = topHeight;
            }
            points.push(
                center.x + Math.cos(radian) * MathUtil.interpolate(radiusNormal, minXRadius, halfWidth),
                center.y + Math.sin(radian) * MathUtil.interpolate(radiusNormal, minYRadius, maxYRadius)
            );
        }
        return points;
    };

}());


(function() {

    window.FluffyCloud = function(){

        //private properties
        var _canvas,
            _context,
            _fluff,
            _fluffGrid = new GridArray();

        //public API
        this.init = function(canvas, bounds, rows, cols){
            _canvas = canvas;
            _context = canvas.getContext("2d");
            _fluffGrid.init(rows, cols);
            createFluffs(bounds);
        }

        this.render = function(debug, color){
            renderFluff(color);
        };

        this.getFluff = function(){
            return _fluff;
        };
        this.getFluffGrid = function(){
            return _fluffGrid;
        };

        //private methods

        var renderEggPath = function(points, fillColor){
            _context.beginPath();
            _context.moveTo(points[0], points[1])
            for(var i=2; i<points.length; i+=2){
                _context.lineTo(points[i], points[i+1]);
            }
            _context.closePath();
            if(fillColor){
                _context.fillStyle = fillColor;//"#FFFFFF";//MathUtil.getRandomHexColorString();// ;
                _context.fill();
            }
        };

        var createFluffs = function(bounds, rows, cols){
            var pointsAlongEgg = Math.round(MathUtil.getRandomNumberInRange(6, 20));
            var eggPoints = EggFactory.getRandomRadiusEggPoints(bounds, pointsAlongEgg, .3);
            renderEggPath(eggPoints);
            _fluff = [];
            var x, y,
                cellWidth = Math.floor(bounds.width / _fluffGrid.getCols()),
                cellHeight = Math.floor(bounds.height / _fluffGrid.getRows()),
                halfCellWidth = Math.floor(cellWidth * .5),
                halfCellHeight = Math.floor(cellHeight * .5),
                radius;
            for(var i=0; i<_fluffGrid.getSize(); i++){
                x = bounds.x + _fluffGrid.getColForIndex(i) * cellWidth + halfCellWidth;
                y = bounds.y + _fluffGrid.getRowForIndex(i) * cellHeight + halfCellHeight;
                if(_context.isPointInPath(x, y)){
                    radius = Math.round(Math.max(halfCellWidth, halfCellHeight) * MathUtil.getRandomNumberInRange(1.6, 2));
                    _fluffGrid.array[i] = _fluff.length;
                    _fluff.push(x, y, radius);
                }else{
                    _fluffGrid.array[i] = -1;
                }
            }
        };

        var renderFluff = function(color){
            _context.beginPath();
            _context.fillStyle = color || "#FFFFFF";
            for(var i=0; i<_fluff.length; i+=3){
                _context.moveTo(_fluff[i], _fluff[i+1]);
                _context.arc(_fluff[i], _fluff[i+1], _fluff[i+2], 0, MathUtil.PI2);
            }
            _context.fill();
        };

    };
}());

(function() {

    window.MorphingFluffyCloud = function(){

        //private properties
        var _canvas, _context,
            _morphData = [],
            _morphGrid = new GridArray(),
            _fromCloud = new FluffyCloud(),
            _toCloud = new FluffyCloud(),
            _animator = new UnitAnimator();

        //public API
        this.init = function(canvas, rows, cols){
            _morphGrid.init(rows, cols);
            _canvas = canvas;
            _context = canvas.getContext("2d");
            initCloud(_toCloud);
            nextMorph();
        };

        this.stop = function(){
            _animator.stop();
        };

        //private methods

        var getRandomCanvasRect = function(minWidth, maxWidth, minHeight, maxHeight){
            var bounds = new Rectangle(
                0,0,
                MathUtil.getRandomNumberInRange(_canvas.width * (minWidth || .4), _canvas.width * (maxWidth || .9)),
                MathUtil.getRandomNumberInRange(_canvas.height * (minHeight || .4), _canvas.height * (maxHeight || .9))
            );
            bounds.x = _canvas.width * .5 - bounds.width * .5;
            bounds.y = _canvas.height * .5 - bounds.height * .5;
            return bounds;
        };


        var initCloud = function(cloud){
            cloud.init(_canvas, getRandomCanvasRect(.5, .9, .5, .9), _morphGrid.getRows(), _morphGrid.getCols());
        };

        var nextMorph = function(){
            //swap from and to clouds
            var temp = _fromCloud;
            _fromCloud = _toCloud;
            _toCloud = temp;
            initCloud(_toCloud);

            _morphData.length = 0;//clear particle system

            var i, fromFluff = _fromCloud.getFluff(),
                fromFluffGrid = _fromCloud.getFluffGrid(),
                toFluff = _toCloud.getFluff(),
                toFluffGrid = _toCloud.getFluffGrid(),
                fromIndex, toIndex,
                fluff = fromFluffGrid.getSize();

            //console.log("fromFluff : ", fromFluff.length/3);
            //console.log("toFluff : ", toFluff.length/3);

            //populate with "fluffs on same grid index" from grids
            for(i=0; i < fluff; i++){
                _morphGrid.array[i] = -1;
                if(fromFluffGrid.array[i] > -1 && toFluffGrid.array[i] > -1){
                    fromIndex = fromFluffGrid.array[i];
                    toIndex = toFluffGrid.array[i];
                    _morphGrid.array[i] = _morphData.length;
                    _morphData.push(
                        fromFluff[fromIndex], fromFluff[fromIndex + 1], fromFluff[fromIndex + 2],
                        toFluff[toIndex], toFluff[toIndex + 1], toFluff[toIndex + 2]
                    );
                }
            }
            //console.log("matches after merge : ", _morphData.length/6);

            var morphIndex = -1;
            for(i=0; i < fluff; i++){
                if(_morphGrid.array[i] > -1){
                    continue;
                }
                //find closest fluff in morphGrid to merge to
                fromIndex = fromFluffGrid.array[i];
                if(fromIndex > -1){
                    morphIndex = GridArrayScanner.searchSurroundingCells(_morphGrid, i, gridScanCompare);//, Math.random() > .5);
                    if(morphIndex > -1 ){
                        _morphData.push(
                            fromFluff[fromIndex], fromFluff[fromIndex + 1], fromFluff[fromIndex + 2],
                            _morphData[morphIndex + 3], _morphData[morphIndex + 4], _morphData[morphIndex + 5]
                        );
                    }else{
                        console.log("WTF WTF WTF  : red ", i);
                    }
                }
                //find closest fluff in morphGrid to emerge from
                toIndex = toFluffGrid.array[i];
                if(toIndex > -1){
                    morphIndex = GridArrayScanner.searchSurroundingCells(_morphGrid, i, gridScanCompare);//, Math.random() > .5);
                    if(morphIndex > -1 ){
                        _morphData.push(
                            _morphData[morphIndex], _morphData[morphIndex + 1], _morphData[morphIndex + 2],
                            toFluff[toIndex], toFluff[toIndex + 1], toFluff[toIndex + 2]
                        );
                    }else{
                        console.log("WTF WTF WTF  : blue ", i);
                    }
                }
            }
            _animator.start(Math.floor(MathUtil.getRandomNumberInRange(3000, 7000)), updateMorph, nextMorph, UnitEasing.easeInOutSine);
        }

        var gridScanCompare = function(value){
            return value > -1;
        };

        var updateMorph = function(normal){
            //background
            _context.fillStyle = "#179ed7";
            _context.fillRect(0, 0, _canvas.width, _canvas.height);

            //sun
            _context.fillStyle = "#ffde25";//ffc000
            _context.beginPath();
            _context.arc(_canvas.width * .75, _canvas.height * .35, Math.min(_canvas.width, _canvas.height) * .2, 0, MathUtil.PI2);
            _context.fill();

            //cloud
            _context.fillStyle = "#555555";
            var fluff = _morphData.length, x, y, radius;
            _context.beginPath();
            for(var i=0; i<fluff; i+=6){
                x = MathUtil.interpolate(normal, _morphData[i], _morphData[i + 3]);
                y = MathUtil.interpolate(normal, _morphData[i + 1], _morphData[i + 4]);
                radius = MathUtil.interpolate(normal, _morphData[i + 2], _morphData[i + 5]);
                _context.moveTo(x, y);
                _context.arc(x, y, radius, 0, MathUtil.PI2);
            }
            _context.fill();

            _context.fillStyle = "#FFFFFF";
            _context.beginPath();
            for(var i=0; i<fluff; i+=6){
                x = MathUtil.interpolate(normal, _morphData[i], _morphData[i + 3]);
                y = MathUtil.interpolate(normal, _morphData[i + 1], _morphData[i + 4]);
                radius = MathUtil.interpolate(normal, _morphData[i + 2], _morphData[i + 5]) * .8;
                _context.moveTo(x, y);
                _context.arc(x, y, radius, 0, MathUtil.PI2);
            }
            _context.fill();
        };

    };

}());

var canvas = document.getElementById("renderCanvas");
canvas.width = window.innerWidth;
canvas.height = window.innerHeight;
var cloud = new MorphingFluffyCloud();
cloud.init(canvas);
            
          
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