konva/src/Node.js

Kinetic.Node = (function() {
    // variable cache
    var TYPE = Kinetic.Type;

    /**
     * Node constructor.  Nodes are entities that can be transformed, layered,
     * and have events bound to them.  They are the building blocks of a KineticJS
     * application
     * @constructor
     * @param {Object} config
     * @param {Number} [config.x]
     * @param {Number} [config.y]
     * @param {Boolean} [config.visible]
     * @param {Boolean} [config.listening] whether or not the node is listening for events
     * @param {String} [config.id] unique id
     * @param {String} [config.name] non-unique name
     * @param {Number} [config.opacity] determines node opacity.  Can be any number between 0 and 1
     * @param {Object} [config.scale]
     * @param {Number} [config.scale.x]
     * @param {Number} [config.scale.y]
     * @param {Number} [config.rotation] rotation in radians
     * @param {Number} [config.rotationDeg] rotation in degrees
     * @param {Object} [config.offset] offsets default position point and rotation point
     * @param {Number} [config.offset.x]
     * @param {Number} [config.offset.y]
     * @param {Boolean} [config.draggable]
     * @param {Function} [config.dragBoundFunc] dragBoundFunc(pos, evt) should return new position
     */
    var Node = function(config) {
        this._nodeInit(config);
    };

    Node.prototype = {
        _nodeInit: function(config) {
            this.defaultNodeAttrs = {
                visible: true,
                listening: true,
                name: undefined,
                opacity: 1,
                x: 0,
                y: 0,
                scale: {
                    x: 1,
                    y: 1
                },
                rotation: 0,
                offset: {
                    x: 0,
                    y: 0
                },
                draggable: false
            };

            this.setDefaultAttrs(this.defaultNodeAttrs);
            this.eventListeners = {};
            this.setAttrs(config);

            // bind events
            var that = this;
            this.on('idChange.kinetic', function(evt) {
                var stage = that.getStage();
                if(stage) {
                    stage._removeId(evt.oldVal);
                    stage._addId(that);
                }
            });
            this.on('nameChange.kinetic', function(evt) {
                var stage = that.getStage();
                if(stage) {
                    stage._removeName(evt.oldVal, that._id);
                    stage._addName(that);
                }
            });
        },
        /**
         * bind events to the node.  KineticJS supports mouseover, mousemove,
         *  mouseout, mousedown, mouseup, click, dblclick, touchstart, touchmove,
         *  touchend, tap, dbltap, dragstart, dragmove, and dragend.  Pass in a string
         *  of event types delimmited by a space to bind multiple events at once
         *  such as 'mousedown mouseup mousemove'. include a namespace to bind an
         *  event by name such as 'click.foobar'.
         * @name on
         * @methodOf Kinetic.Node.prototype
         * @param {String} typesStr
         * @param {Function} handler
         */
        on: function(typesStr, handler) {
            var types = typesStr.split(' ');
            /*
             * loop through types and attach event listeners to
             * each one.  eg. 'click mouseover.namespace mouseout'
             * will create three event bindings
             */
            var len = types.length;
            for(var n = 0; n < len; n++) {
                var type = types[n];
                var event = type;
                var parts = event.split('.');
                var baseEvent = parts[0];
                var name = parts.length > 1 ? parts[1] : '';

                if(!this.eventListeners[baseEvent]) {
                    this.eventListeners[baseEvent] = [];
                }

                this.eventListeners[baseEvent].push({
                    name: name,
                    handler: handler
                });
            }
        },
        /**
         * remove event bindings from the node.  Pass in a string of
         *  event types delimmited by a space to remove multiple event
         *  bindings at once such as 'mousedown mouseup mousemove'.
         *  include a namespace to remove an event binding by name
         *  such as 'click.foobar'. If you only give a name like '.foobar',
         *  all events in that namespace will be removed.
         * @name off
         * @methodOf Kinetic.Node.prototype
         * @param {String} typesStr
         */
        off: function(typesStr) {
            var types = typesStr.split(' ');
            var len = types.length;
            for(var n = 0; n < len; n++) {
                var type = types[n];
                //var event = (type.indexOf('touch') === -1) ? 'on' + type : type;
                var event = type;
                var parts = event.split('.');
                var baseEvent = parts[0];

                if(parts.length > 1) {
                    if(baseEvent) {
                        if(this.eventListeners[baseEvent]) {
                            this._off(baseEvent, parts[1]);
                        }
                    }
                    else {
                        for(var type in this.eventListeners) {
                            this._off(type, parts[1]);
                        }
                    }
                }
                else {
                    delete this.eventListeners[baseEvent];
                }
            }
        },
        /**
         * remove child from container
         * @name remove
         * @methodOf Kinetic.Container.prototype
         * @param {Node} child
         */
        remove: function() {
            var parent = this.getParent();
            if(parent && this.index !== undefined && parent.children[this.index]._id == this._id) {
                var stage = parent.getStage();
                /*
                 * remove event listeners and references to the node
                 * from the ids and names hashes
                 */
                if(stage) {
                    stage._removeId(this.getId());
                    stage._removeName(this.getName(), this._id);
                }

                Kinetic.Global._removeTempNode(this);
                parent.children.splice(this.index, 1);
                parent._setChildrenIndices();

                // remove children
                while(this.children && this.children.length > 0) {
                    this.children[0].remove();
                }
            }
        },
        /**
         * get attrs
         * @name getAttrs
         * @methodOf Kinetic.Node.prototype
         */
        getAttrs: function() {
            return this.attrs;
        },
        /**
         * set default attrs.  This method should only be used if
         *  you're creating a custom node
         * @name setDefaultAttrs
         * @methodOf Kinetic.Node.prototype
         * @param {Object} confic
         */
        setDefaultAttrs: function(config) {
            // create attrs object if undefined
            if(this.attrs === undefined) {
                this.attrs = {};
            }

            if(config) {
                for(var key in config) {
                    /*
                     * only set the attr if it's undefined in case
                     * a developer writes a custom class that extends
                     * a Kinetic Class such that their default property
                     * isn't overwritten by the Kinetic Class default
                     * property
                     */
                    if(this.attrs[key] === undefined) {
                        this.attrs[key] = config[key];
                    }
                }
            }
        },
        /**
         * set attrs
         * @name setAttrs
         * @methodOf Kinetic.Node.prototype
         * @param {Object} config
         */
        setAttrs: function(config) {
            if(config) {
                for(var key in config) {
                    var method = 'set' + key.charAt(0).toUpperCase() + key.slice(1);
                    // use setter if available
                    if(TYPE._isFunction(this[method])) {
                        this[method](config[key]);
                    }
                    // otherwise set directly
                    else {
                        this.setAttr(key, config[key]);
                    }
                }
            }
        },
        /**
         * determine if node is visible or not.  Node is visible only
         *  if it's visible and all of its ancestors are visible.  If an ancestor
         *  is invisible, this means that the node is also invisible
         * @name getVisible
         * @methodOf Kinetic.Node.prototype
         */
        getVisible: function() {
            if(this.attrs.visible && this.getParent() && !this.getParent().getVisible()) {
                return false;
            }
            return this.attrs.visible;
        },
        /**
         * determine if node is listening or not.  Node is listening only
         *  if it's listening and all of its ancestors are listening.  If an ancestor
         *  is not listening, this means that the node is also not listening
         * @name getListening
         * @methodOf Kinetic.Node.prototype
         */
        getListening: function() {
            if(this.attrs.listening && this.getParent() && !this.getParent().getListening()) {
                return false;
            }
            return this.attrs.listening;
        },
        /**
         * show node
         * @name show
         * @methodOf Kinetic.Node.prototype
         */
        show: function() {
            this.setVisible(true);
        },
        /**
         * hide node.  Hidden nodes are no longer detectable
         * @name hide
         * @methodOf Kinetic.Node.prototype
         */
        hide: function() {
            this.setVisible(false);
        },
        /**
         * get zIndex
         * @name getZIndex
         * @methodOf Kinetic.Node.prototype
         */
        getZIndex: function() {
            return this.index;
        },
        /**
         * get absolute z-index which takes into account sibling
         *  and parent indices
         * @name getAbsoluteZIndex
         * @methodOf Kinetic.Node.prototype
         */
        getAbsoluteZIndex: function() {
            var level = this.getLevel();
            var stage = this.getStage();
            var that = this;
            var index = 0;
            function addChildren(children) {
                var nodes = [];
                var len = children.length;
                for(var n = 0; n < len; n++) {
                    var child = children[n];
                    index++;

                    if(child.nodeType !== 'Shape') {
                        nodes = nodes.concat(child.getChildren());
                    }

                    if(child._id === that._id) {
                        n = len;
                    }
                }

                if(nodes.length > 0 && nodes[0].getLevel() <= level) {
                    addChildren(nodes);
                }
            }
            if(that.nodeType !== 'Stage') {
                addChildren(that.getStage().getChildren());
            }

            return index;
        },
        /**
         * get node level in node tree
         * @name getLevel
         * @methodOf Kinetic.Node.prototype
         */
        getLevel: function() {
            var level = 0;
            var parent = this.parent;
            while(parent) {
                level++;
                parent = parent.parent;
            }
            return level;
        },
        /**
         * set node position
         * @name setPosition
         * @methodOf Kinetic.Node.prototype
         * @param {Number} x
         * @param {Number} y
         */
        setPosition: function() {
            var pos = TYPE._getXY([].slice.call(arguments));
            this.setAttr('x', pos.x);
            this.setAttr('y', pos.y);
        },
        /**
         * get node position relative to container
         * @name getPosition
         * @methodOf Kinetic.Node.prototype
         */
        getPosition: function() {
            return {
                x: this.attrs.x,
                y: this.attrs.y
            };
        },
        /**
         * get absolute position
         * @name getAbsolutePosition
         * @methodOf Kinetic.Node.prototype
         */
        getAbsolutePosition: function() {
            var trans = this.getAbsoluteTransform();
            var o = this.getOffset();
            trans.translate(o.x, o.y);
            return trans.getTranslation();
        },
        /**
         * set absolute position
         * @name setAbsolutePosition
         * @methodOf Kinetic.Node.prototype
         * @param {Object} pos object containing an x and
         *  y property
         */
        setAbsolutePosition: function() {
            var pos = TYPE._getXY([].slice.call(arguments));
            var trans = this._clearTransform();
            // don't clear translation
            this.attrs.x = trans.x;
            this.attrs.y = trans.y;
            delete trans.x;
            delete trans.y;

            // unravel transform
            var it = this.getAbsoluteTransform();

            it.invert();
            it.translate(pos.x, pos.y);
            pos = {
                x: this.attrs.x + it.getTranslation().x,
                y: this.attrs.y + it.getTranslation().y
            };

            this.setPosition(pos.x, pos.y);
            this._setTransform(trans);
        },
        /**
         * move node by an amount
         * @name move
         * @methodOf Kinetic.Node.prototype
         * @param {Number} x
         * @param {Number} y
         */
        move: function() {
            var pos = TYPE._getXY([].slice.call(arguments));

            var x = this.getX();
            var y = this.getY();

            if(pos.x !== undefined) {
                x += pos.x;
            }

            if(pos.y !== undefined) {
                y += pos.y;
            }

            this.setPosition(x, y);
        },
        /**
         * get rotation in degrees
         * @name getRotationDeg
         * @methodOf Kinetic.Node.prototype
         */
        getRotationDeg: function() {
            return this.getRotation() * 180 / Math.PI;
        },
        /**
         * set rotation in degrees
         * @name setRotationDeg
         * @methodOf Kinetic.Node.prototype
         * @param {Number} rotDeg
         */
        setRotationDeg: function(rotDeg) {
            this.setRotation(rotDeg * Math.PI / 180);
        },
        /**
         * rotate node by an amount in radians
         * @name rotate
         * @methodOf Kinetic.Node.prototype
         * @param {Number} theta
         */
        rotate: function(theta) {
            this.setRotation(this.getRotation() + theta);
        },
        /**
         * rotate node by an amount in degrees
         * @name rotateDeg
         * @methodOf Kinetic.Node.prototype
         * @param {Number} deg
         */
        rotateDeg: function(deg) {
            this.setRotation(this.getRotation() + (deg * Math.PI / 180));
        },
        /**
         * move node to the top of its siblings
         * @name moveToTop
         * @methodOf Kinetic.Node.prototype
         */
        moveToTop: function() {
            var index = this.index;
            this.parent.children.splice(index, 1);
            this.parent.children.push(this);
            this.parent._setChildrenIndices();
            return true;
        },
        /**
         * move node up
         * @name moveUp
         * @methodOf Kinetic.Node.prototype
         */
        moveUp: function() {
            var index = this.index;
            var len = this.parent.getChildren().length;
            if(index < len - 1) {
                this.parent.children.splice(index, 1);
                this.parent.children.splice(index + 1, 0, this);
                this.parent._setChildrenIndices();
                return true;
            }
        },
        /**
         * move node down
         * @name moveDown
         * @methodOf Kinetic.Node.prototype
         */
        moveDown: function() {
            var index = this.index;
            if(index > 0) {
                this.parent.children.splice(index, 1);
                this.parent.children.splice(index - 1, 0, this);
                this.parent._setChildrenIndices();
                return true;
            }
        },
        /**
         * move node to the bottom of its siblings
         * @name moveToBottom
         * @methodOf Kinetic.Node.prototype
         */
        moveToBottom: function() {
            var index = this.index;
            if(index > 0) {
                this.parent.children.splice(index, 1);
                this.parent.children.unshift(this);
                this.parent._setChildrenIndices();
                return true;
            }
        },
        /**
         * set zIndex
         * @name setZIndex
         * @methodOf Kinetic.Node.prototype
         * @param {Integer} zIndex
         */
        setZIndex: function(zIndex) {
            var index = this.index;
            this.parent.children.splice(index, 1);
            this.parent.children.splice(zIndex, 0, this);
            this.parent._setChildrenIndices();
        },
        /**
         * get absolute opacity
         * @name getAbsoluteOpacity
         * @methodOf Kinetic.Node.prototype
         */
        getAbsoluteOpacity: function() {
            var absOpacity = this.getOpacity();
            if(this.getParent()) {
                absOpacity *= this.getParent().getAbsoluteOpacity();
            }
            return absOpacity;
        },
        /**
         * move node to another container
         * @name moveTo
         * @methodOf Kinetic.Node.prototype
         * @param {Container} newContainer
         */
        moveTo: function(newContainer) {
            var parent = this.parent;
            // remove from parent's children
            parent.children.splice(this.index, 1);
            parent._setChildrenIndices();

            // add to new parent
            newContainer.children.push(this);
            this.index = newContainer.children.length - 1;
            this.parent = newContainer;
            newContainer._setChildrenIndices();
        },
        /**
         * convert Node into an object for serialization
         * @name toObject
         * @methodOf Kinetic.Node.prototype
         */
        toObject: function() {
            var obj = {};

            obj.attrs = {};

            // serialize only attributes that are not function, image, DOM, or objects with methods
            for(var key in this.attrs) {
                var val = this.attrs[key];
                if(!TYPE._isFunction(val) && !TYPE._isElement(val) && !(TYPE._isObject(val) && TYPE._hasMethods(val))) {
                    obj.attrs[key] = val;
                }
            }

            obj.nodeType = this.nodeType;
            obj.shapeType = this.shapeType;

            return obj;
        },
        toJSON: function() {
            return JSON.stringify(this.toObject());
        },
        /**
         * get parent container
         * @name getParent
         * @methodOf Kinetic.Node.prototype
         */
        getParent: function() {
            return this.parent;
        },
        /**
         * get layer that contains the node
         * @name getLayer
         * @methodOf Kinetic.Node.prototype
         */
        getLayer: function() {
            return this.getParent().getLayer();
        },
        /**
         * get stage that contains the node
         * @name getStage
         * @methodOf Kinetic.Node.prototype
         */
        getStage: function() {
            if(this.getParent()) {
                return this.getParent().getStage();
            }
            else {
                return undefined;
            }
        },
        /**
         * simulate event with event bubbling
         * @name simulate
         * @methodOf Kinetic.Node.prototype
         * @param {String} eventType
         * @param {EventObject} evt event object
         */
        simulate: function(eventType, evt) {
            this._handleEvent(eventType, evt || {});
        },
        /**
         * synthetically fire an event.&nbsp; The event object will not bubble up the Node tree.&nbsp; You can also pass in custom properties
         * @name fire
         * @methodOf Kinetic.Node.prototype
         * @param {String} eventType
         * @param {Object} obj optional object which can be used to pass parameters
         */
        fire: function(eventType, obj) {
            this._executeHandlers(eventType, obj || {});
        },
        /**
         * get absolute transform of the node which takes into
         *  account its parent transforms
         * @name getAbsoluteTransform
         * @methodOf Kinetic.Node.prototype
         */
        getAbsoluteTransform: function() {
            // absolute transform
            var am = new Kinetic.Transform();

            var family = [];
            var parent = this.parent;

            family.unshift(this);
            while(parent) {
                family.unshift(parent);
                parent = parent.parent;
            }

            var len = family.length;
            for(var n = 0; n < len; n++) {
                var node = family[n];
                var m = node.getTransform();
                am.multiply(m);
            }

            return am;
        },
        /**
         * get transform of the node
         * @name getTransform
         * @methodOf Kinetic.Node.prototype
         */
        getTransform: function() {
            var m = new Kinetic.Transform();

            if(this.attrs.x !== 0 || this.attrs.y !== 0) {
                m.translate(this.attrs.x, this.attrs.y);
            }
            if(this.attrs.rotation !== 0) {
                m.rotate(this.attrs.rotation);
            }
            if(this.attrs.scale.x !== 1 || this.attrs.scale.y !== 1) {
                m.scale(this.attrs.scale.x, this.attrs.scale.y);
            }
            if(this.attrs.offset && (this.attrs.offset.x !== 0 || this.attrs.offset.y !== 0)) {
                m.translate(-1 * this.attrs.offset.x, -1 * this.attrs.offset.y);
            }

            return m;
        },
        /**
         * clone node
         * @name clone
         * @methodOf Kinetic.Node.prototype
         * @param {Object} attrs override attrs
         */
        clone: function(obj) {
            // instantiate new node
            var classType = this.shapeType || this.nodeType;
            var node = new Kinetic[classType](this.attrs);

            /*
             * copy over user listeners
             */
            for(var key in this.eventListeners) {
                var allListeners = this.eventListeners[key];
                var len = allListeners.length;
                for(var n = 0; n < len; n++) {
                    var listener = allListeners[n];
                    /*
                     * don't include kinetic namespaced listeners because
                     *  these are generated by the constructors
                     */
                    if(listener.name.indexOf('kinetic') < 0) {
                        // if listeners array doesn't exist, then create it
                        if(!node.eventListeners[key]) {
                            node.eventListeners[key] = [];
                        }
                        node.eventListeners[key].push(listener);
                    }
                }
            }

            // apply attr overrides
            node.setAttrs(obj);
            return node;
        },
        /**
         * Creates a composite data URL. If MIME type is not
         * specified, then "image/png" will result. For "image/jpeg", specify a quality
         * level as quality (range 0.0 - 1.0)
         * @name toDataURL
         * @methodOf Kinetic.Node.prototype
         * @param {Object} config
         * @param {String} [config.mimeType] mime type.  can be "image/png" or "image/jpeg".
         *  "image/png" is the default
         * @param {Number} [config.width] data url image width
         * @param {Number} [config.height] data url image height
         * @param {Number} [config.quality] jpeg quality.  If using an "image/jpeg" mimeType,
         *  you can specify the quality from 0 to 1, where 0 is very poor quality and 1
         *  is very high quality
         */
        toDataURL: function(config) {
            var mimeType = config && config.mimeType ? config.mimeType : null;
            var quality = config && config.quality ? config.quality : null;
            var canvas;

            //if width and height are defined, create new canvas to draw on, else reuse stage buffer canvas
            if(config && config.width && config.height) {
                canvas = new Kinetic.Canvas(config.width, config.height);
            }
            else {
                canvas = this.getStage().canvas;
                canvas.clear();
            }

            this.draw(canvas);
            return canvas.toDataURL(mimeType, quality);
        },
        /**
         * converts node into an image.  Since the toImage
         *  method is asynchronous, a callback is required
         * @name toImage
         * @methodOf Kinetic.Node.prototype
         * @param {Object} config
         * @param {Function} config.callback since the toImage() method is asynchonrous, the
         *  resulting image object is passed into the callback function
         * @param {String} [config.mimeType] mime type.  can be "image/png" or "image/jpeg".
         *  "image/png" is the default
         * @param {Number} [config.width] data url image width
         * @param {Number} [config.height] data url image height
         * @param {Number} [config.quality] jpeg quality.  If using an "image/jpeg" mimeType,
         *  you can specify the quality from 0 to 1, where 0 is very poor quality and 1
         *  is very high quality
         */
        toImage: function(config) {
            TYPE._getImage(this.toDataURL(config), function(img) {
                config.callback(img);
            });
        },
        /**
         * set offset.  A node's offset defines the position and rotation point
         * @name setOffset
         * @methodOf Kinetic.Node.prototype
         * @param {Number} x
         * @param {Number} y
         */
        setOffset: function() {
            var pos = TYPE._getXY([].slice.call(arguments));
            if(pos.x === undefined) {
                pos.x = this.getOffset().x;
            }
            if(pos.y === undefined) {
                pos.y = this.getOffset().y;
            }
            this.setAttr('offset', pos);
        },
        /**
         * set scale.
         * @name setScale
         * @param {Number} x
         * @param {Number} y
         * @methodOf Kinetic.Node.prototype
         */
        setScale: function() {
            var pos = TYPE._getXY([].slice.call(arguments));

            if(pos.x === undefined) {
                pos.x = this.getScale().x;
            }
            if(pos.y === undefined) {
                pos.y = this.getScale().y;
            }
            this.setAttr('scale', pos);

        },
        /**
         * set size
         * @name setSize
         * @methodOf Kinetic.Node.prototype
         * @param {Number} width
         * @param {Number} height
         */
        setSize: function() {
            // set stage dimensions
            var size = TYPE._getSize(Array.prototype.slice.call(arguments));
            this.setWidth(size.width);
            this.setHeight(size.height);
        },
        /**
         * get size
         * @name getSize
         * @methodOf Kinetic.Node.prototype
         */
        getSize: function() {
            return {
                width: this.getWidth(),
                height: this.getHeight()
            };
        },
        /**
         * get width
         * @name getWidth
         * @methodOf Kinetic.Node.prototype
         */
        getWidth: function() {
            return this.attrs.width || 0;
        },
        /**
         * get height
         * @name getHeight
         * @methodOf Kinetic.Node.prototype
         */
        getHeight: function() {
            return this.attrs.height || 0;
        },
        _get: function(selector) {
            return this.nodeType === selector ? [this] : [];
        },
        _off: function(type, name) {
            for(var i = 0; i < this.eventListeners[type].length; i++) {
                if(this.eventListeners[type][i].name === name) {
                    this.eventListeners[type].splice(i, 1);
                    if(this.eventListeners[type].length === 0) {
                        delete this.eventListeners[type];
                        break;
                    }
                    i--;
                }
            }
        },
        _clearTransform: function() {
            var trans = {
                x: this.attrs.x,
                y: this.attrs.y,
                rotation: this.attrs.rotation,
                scale: {
                    x: this.attrs.scale.x,
                    y: this.attrs.scale.y
                },
                offset: {
                    x: this.attrs.offset.x,
                    y: this.attrs.offset.y
                }
            };

            this.attrs.x = 0;
            this.attrs.y = 0;
            this.attrs.rotation = 0;
            this.attrs.scale = {
                x: 1,
                y: 1
            };
            this.attrs.offset = {
                x: 0,
                y: 0
            };

            return trans;
        },
        _setTransform: function(trans) {
            for(var key in trans) {
                this.attrs[key] = trans[key];
            }
        },
        _fireBeforeChangeEvent: function(attr, oldVal, newVal) {
            this._handleEvent('before' + attr.toUpperCase() + 'Change', {
                oldVal: oldVal,
                newVal: newVal
            });
        },
        _fireChangeEvent: function(attr, oldVal, newVal) {
            this._handleEvent(attr + 'Change', {
                oldVal: oldVal,
                newVal: newVal
            });
        },
        setAttr: function(key, val) {
            if(val !== undefined) {
                var oldVal = this.attrs[key];
                this._fireBeforeChangeEvent(key, oldVal, val);
                this.attrs[key] = val;
                this._fireChangeEvent(key, oldVal, val);
            }
        },
        /**
         * handle node event
         */
        _handleEvent: function(eventType, evt, compareShape) {
            if(evt && this.nodeType === 'Shape') {
                evt.shape = this;
            }
            var stage = this.getStage();
            var el = this.eventListeners;
            var okayToRun = true;

            if(eventType === 'mouseenter' && compareShape && this._id === compareShape._id) {
                okayToRun = false;
            }
            else if(eventType === 'mouseleave' && compareShape && this._id === compareShape._id) {
                okayToRun = false;
            }

            if(okayToRun) {
                if(el[eventType]) {
                    this.fire(eventType, evt);
                }

                // simulate event bubbling
                if(evt && !evt.cancelBubble && this.parent) {
                    if(compareShape && compareShape.parent) {
                        this._handleEvent.call(this.parent, eventType, evt, compareShape.parent);
                    }
                    else {
                        this._handleEvent.call(this.parent, eventType, evt);
                    }
                }
            }
        },
        _executeHandlers: function(eventType, evt) {
            var events = this.eventListeners[eventType];
            var len = events.length;
            for(var i = 0; i < len; i++) {
                events[i].handler.apply(this, [evt]);
            }
        },
        _shouldDraw: function(canvas) {
            return (this.isVisible() && (!canvas || canvas.getContext().type === 'scene' || this.getListening()));
        }
    };

    // add getter and setter methods
    Node.addSetters = function(constructor, arr) {
        var len = arr.length;
        for(var n = 0; n < len; n++) {
            var attr = arr[n];
            this._addSetter(constructor, attr);
        }
    };
    Node.addGetters = function(constructor, arr) {
        var len = arr.length;
        for(var n = 0; n < len; n++) {
            var attr = arr[n];
            this._addGetter(constructor, attr);
        }
    };
    Node.addGettersSetters = function(constructor, arr) {
        this.addSetters(constructor, arr);
        this.addGetters(constructor, arr);
    };
    Node._addSetter = function(constructor, attr) {
        var that = this;
        var method = 'set' + attr.charAt(0).toUpperCase() + attr.slice(1);
        constructor.prototype[method] = function(val) {
            this.setAttr(attr, val);
        };
    };
    Node._addGetter = function(constructor, attr) {
        var that = this;
        var method = 'get' + attr.charAt(0).toUpperCase() + attr.slice(1);
        constructor.prototype[method] = function(arg) {
            return this.attrs[attr];
        };
    };
    /**
     * create node with JSON string.  De-serializtion does not generate custom
     *  shape drawing functions, images, or event handlers (this would make the
     * 	serialized object huge).  If your app uses custom shapes, images, and
     *  event handlers (it probably does), then you need to select the appropriate
     *  shapes after loading the stage and set these properties via on(), setDrawFunc(),
     *  and setImage()
     * @name create
     * @methodOf Kinetic.Node
     * @param {String} JSON string
     */
    Node.create = function(json, container) {
        return this._createNode(JSON.parse(json), container);
    };
    Node._createNode = function(obj, container) {
        var type;

        // determine type
        if(obj.nodeType === 'Shape') {
            // add custom shape
            if(obj.shapeType === undefined) {
                type = 'Shape';
            }
            // add standard shape
            else {
                type = obj.shapeType;
            }
        }
        else {
            type = obj.nodeType;
        }

        // if container was passed in, add it to attrs
        if(container) {
            obj.attrs.container = container;
        }

        var no = new Kinetic[type](obj.attrs);
        if(obj.children) {
            var len = obj.children.length;
            for(var n = 0; n < len; n++) {
                no.add(this._createNode(obj.children[n]));
            }
        }

        return no;
    };
    // add getters setters
    Node.addGettersSetters(Node, ['x', 'y', 'rotation', 'opacity', 'name', 'id']);
    Node.addGetters(Node, ['scale', 'offset']);
    Node.addSetters(Node, ['width', 'height', 'listening', 'visible']);

    // mappings
    /**
     * Alias of getListening()
     * @name isListening
     * @methodOf Kinetic.Node.prototype
     */
    Node.prototype.isListening = Node.prototype.getListening;
    /**
     * Alias of getVisible()
     * @name isVisible
     * @methodOf Kinetic.Node.prototype
     */
    Node.prototype.isVisible = Node.prototype.getVisible;

    // collection mappings
    var collectionMappings = ['on', 'off'];
    for(var n = 0; n < 2; n++) {
        // induce scope
        (function(i) {
            var method = collectionMappings[i];
            Kinetic.Collection.prototype[method] = function() {
                var args = [].slice.call(arguments);
                args.unshift(method);
                this.apply.apply(this, args);
            };
        })(n);
    }

    /**
     * set node x position
     * @name setX
     * @methodOf Kinetic.Node.prototype
     * @param {Number} x
     */

    /**
     * set node y position
     * @name setY
     * @methodOf Kinetic.Node.prototype
     * @param {Number} y
     */

    /**
     * set node rotation in radians
     * @name setRotation
     * @methodOf Kinetic.Node.prototype
     * @param {Number} theta
     */

    /**
     * set opacity.  Opacity values range from 0 to 1.
     *  A node with an opacity of 0 is fully transparent, and a node
     *  with an opacity of 1 is fully opaque
     * @name setOpacity
     * @methodOf Kinetic.Node.prototype
     * @param {Object} opacity
     */

    /**
     * set name
     * @name setName
     * @methodOf Kinetic.Node.prototype
     * @param {String} name
     */

    /**
     * set id
     * @name setId
     * @methodOf Kinetic.Node.prototype
     * @param {String} id
     */

    /**
     * listen or don't listen to events
     * @name setListening
     * @methodOf Kinetic.Node.prototype
     * @param {Boolean} listening
     */

    /**
     * set visible
     * @name setVisible
     * @methodOf Kinetic.Node.prototype
     * @param {Boolean} visible
     */

    /**
     * get node x position
     * @name getX
     * @methodOf Kinetic.Node.prototype
     */

    /**
     * get node y position
     * @name getY
     * @methodOf Kinetic.Node.prototype
     */

    /**
     * get rotation in radians
     * @name getRotation
     * @methodOf Kinetic.Node.prototype
     */

    /**
     * get opacity.
     * @name getOpacity
     * @methodOf Kinetic.Node.prototype
     */

    /**
     * get name
     * @name getName
     * @methodOf Kinetic.Node.prototype
     */

    /**
     * get id
     * @name getId
     * @methodOf Kinetic.Node.prototype
     */

    /**
     * get scale
     * @name getScale
     * @methodOf Kinetic.Node.prototype
     */

    /**
     * get offset
     * @name getOffset
     * @methodOf Kinetic.Node.prototype
     */

    return Node;
})();