/**
 * Copyright (c) 2006-2017, JGraph Ltd
 * Copyright (c) 2006-2017, Gaudenz Alder
 */
/**
 * Class: mxCellRenderer
 * 
 * Renders cells into a document object model. The <defaultShapes> is a global
 * map of shapename, constructor pairs that is used in all instances. You can
 * get a list of all available shape names using the following code.
 * 
 * In general the cell renderer is in charge of creating, redrawing and
 * destroying the shape and label associated with a cell state, as well as
 * some other graphical objects, namely controls and overlays. The shape
 * hieararchy in the display (ie. the hierarchy in which the DOM nodes
 * appear in the document) does not reflect the cell hierarchy. The shapes
 * are a (flat) sequence of shapes and labels inside the draw pane of the
 * graph view, with some exceptions, namely the HTML labels being placed
 * directly inside the graph container for certain browsers.
 * 
 * (code)
 * mxLog.show();
 * for (var i in mxCellRenderer.defaultShapes)
 * {
 *   mxLog.debug(i);
 * }
 * (end)
 *
 * Constructor: mxCellRenderer
 * 
 * Constructs a new cell renderer with the following built-in shapes:
 * arrow, rectangle, ellipse, rhombus, image, line, label, cylinder,
 * swimlane, connector, actor and cloud.
 */
function mxCellRenderer() { };

/**
 * Variable: defaultShapes
 * 
 * Static array that contains the globally registered shapes which are
 * known to all instances of this class. For adding new shapes you should
 * use the static <mxCellRenderer.registerShape> function.
 */
mxCellRenderer.defaultShapes = new Object();

/**
 * Variable: defaultEdgeShape
 * 
 * Defines the default shape for edges. Default is <mxConnector>.
 */
mxCellRenderer.prototype.defaultEdgeShape = mxConnector;

/**
 * Variable: defaultVertexShape
 * 
 * Defines the default shape for vertices. Default is <mxRectangleShape>.
 */
mxCellRenderer.prototype.defaultVertexShape = mxRectangleShape;

/**
 * Variable: defaultTextShape
 * 
 * Defines the default shape for labels. Default is <mxText>.
 */
mxCellRenderer.prototype.defaultTextShape = mxText;

/**
 * Variable: legacyControlPosition
 * 
 * Specifies if the folding icon should ignore the horizontal
 * orientation of a swimlane. Default is true.
 */
mxCellRenderer.prototype.legacyControlPosition = true;

/**
 * Variable: legacySpacing
 * 
 * Specifies if spacing and label position should be ignored if overflow is
 * fill or width. Default is true for backwards compatiblity.
 */
mxCellRenderer.prototype.legacySpacing = true;

/**
 * Variable: antiAlias
 * 
 * Anti-aliasing option for new shapes. Default is true.
 */
mxCellRenderer.prototype.antiAlias = true;

/**
 * Variable: minSvgStrokeWidth
 * 
 * Minimum stroke width for SVG output.
 */
mxCellRenderer.prototype.minSvgStrokeWidth = 1;

/**
 * Variable: forceControlClickHandler
 * 
 * Specifies if the enabled state of the graph should be ignored in the control
 * click handler (to allow folding in disabled graphs). Default is false.
 */
mxCellRenderer.prototype.forceControlClickHandler = false;

/**
 * Function: registerShape
 * 
 * Registers the given constructor under the specified key in this instance
 * of the renderer.
 * 
 * Example:
 * 
 * (code)
 * mxCellRenderer.registerShape(mxConstants.SHAPE_RECTANGLE, mxRectangleShape);
 * (end)
 * 
 * Parameters:
 * 
 * key - String representing the shape name.
 * shape - Constructor of the <mxShape> subclass.
 */
mxCellRenderer.registerShape = function(key, shape)
{
	mxCellRenderer.defaultShapes[key] = shape;
};

// Adds default shapes into the default shapes array
mxCellRenderer.registerShape(mxConstants.SHAPE_RECTANGLE, mxRectangleShape);
mxCellRenderer.registerShape(mxConstants.SHAPE_ELLIPSE, mxEllipse);
mxCellRenderer.registerShape(mxConstants.SHAPE_RHOMBUS, mxRhombus);
mxCellRenderer.registerShape(mxConstants.SHAPE_CYLINDER, mxCylinder);
mxCellRenderer.registerShape(mxConstants.SHAPE_CONNECTOR, mxConnector);
mxCellRenderer.registerShape(mxConstants.SHAPE_ACTOR, mxActor);
mxCellRenderer.registerShape(mxConstants.SHAPE_TRIANGLE, mxTriangle);
mxCellRenderer.registerShape(mxConstants.SHAPE_HEXAGON, mxHexagon);
mxCellRenderer.registerShape(mxConstants.SHAPE_CLOUD, mxCloud);
mxCellRenderer.registerShape(mxConstants.SHAPE_LINE, mxLine);
mxCellRenderer.registerShape(mxConstants.SHAPE_ARROW, mxArrow);
mxCellRenderer.registerShape(mxConstants.SHAPE_ARROW_CONNECTOR, mxArrowConnector);
mxCellRenderer.registerShape(mxConstants.SHAPE_DOUBLE_ELLIPSE, mxDoubleEllipse);
mxCellRenderer.registerShape(mxConstants.SHAPE_SWIMLANE, mxSwimlane);
mxCellRenderer.registerShape(mxConstants.SHAPE_IMAGE, mxImageShape);
mxCellRenderer.registerShape(mxConstants.SHAPE_LABEL, mxLabel);

/**
 * Function: initializeShape
 * 
 * Initializes the shape in the given state by calling its init method with
 * the correct container after configuring it using <configureShape>.
 * 
 * Parameters:
 * 
 * state - <mxCellState> for which the shape should be initialized.
 */
mxCellRenderer.prototype.initializeShape = function(state)
{
	state.shape.dialect = state.view.graph.dialect;
	this.configureShape(state);
	state.shape.init(state.view.getDrawPane());
};

/**
 * Function: createShape
 * 
 * Creates and returns the shape for the given cell state.
 * 
 * Parameters:
 * 
 * state - <mxCellState> for which the shape should be created.
 */
mxCellRenderer.prototype.createShape = function(state)
{
	var shape = null;
	
	if (state.style != null)
	{
		// Checks if there is a stencil for the name and creates
		// a shape instance for the stencil if one exists
		var stencil = mxStencilRegistry.getStencil(state.style[mxConstants.STYLE_SHAPE]);
		
		if (stencil != null)
		{
			shape = new mxShape(stencil);
		}
		else
		{
			var ctor = this.getShapeConstructor(state);
			shape = new ctor();
		}
	}
	
	return shape;
};

/**
 * Function: createIndicatorShape
 * 
 * Creates the indicator shape for the given cell state.
 * 
 * Parameters:
 * 
 * state - <mxCellState> for which the indicator shape should be created.
 */
mxCellRenderer.prototype.createIndicatorShape = function(state)
{
	state.shape.indicatorShape = this.getShape(state.view.graph.getIndicatorShape(state));
};

/**
 * Function: getShape
 * 
 * Returns the shape for the given name from <defaultShapes>.
 */
mxCellRenderer.prototype.getShape = function(name)
{
	return (name != null) ? mxCellRenderer.defaultShapes[name] : null;
};

/**
 * Function: getShapeConstructor
 * 
 * Returns the constructor to be used for creating the shape.
 */
mxCellRenderer.prototype.getShapeConstructor = function(state)
{
	var ctor = this.getShape(state.style[mxConstants.STYLE_SHAPE]);
	
	if (ctor == null)
	{
		ctor = (state.view.graph.getModel().isEdge(state.cell)) ?
			this.defaultEdgeShape : this.defaultVertexShape;
	}
	
	return ctor;
};

/**
 * Function: configureShape
 * 
 * Configures the shape for the given cell state.
 * 
 * Parameters:
 * 
 * state - <mxCellState> for which the shape should be configured.
 */
mxCellRenderer.prototype.configureShape = function(state)
{
	state.shape.apply(state);
	state.shape.image = state.view.graph.getImage(state);
	state.shape.indicatorColor = state.view.graph.getIndicatorColor(state);
	state.shape.indicatorStrokeColor = state.style[mxConstants.STYLE_INDICATOR_STROKECOLOR];
	state.shape.indicatorGradientColor = state.view.graph.getIndicatorGradientColor(state);
	state.shape.indicatorDirection = state.style[mxConstants.STYLE_INDICATOR_DIRECTION];
	state.shape.indicatorImage = state.view.graph.getIndicatorImage(state);

	this.postConfigureShape(state);
};

/**
 * Function: postConfigureShape
 * 
 * Replaces any reserved words used for attributes, eg. inherit,
 * indicated or swimlane for colors in the shape for the given state.
 * This implementation resolves these keywords on the fill, stroke
 * and gradient color keys.
 */
mxCellRenderer.prototype.postConfigureShape = function(state)
{
	if (state.shape != null)
	{
		this.resolveColor(state, 'indicatorGradientColor', mxConstants.STYLE_GRADIENTCOLOR);
		this.resolveColor(state, 'indicatorColor', mxConstants.STYLE_FILLCOLOR);
		this.resolveColor(state, 'gradient', mxConstants.STYLE_GRADIENTCOLOR);
		this.resolveColor(state, 'stroke', mxConstants.STYLE_STROKECOLOR);
		this.resolveColor(state, 'fill', mxConstants.STYLE_FILLCOLOR);
	}
};

/**
 * Function: checkPlaceholderStyles
 * 
 * Checks if the style of the given <mxCellState> contains 'inherit',
 * 'indicated' or 'swimlane' for colors that support those keywords.
 */
mxCellRenderer.prototype.checkPlaceholderStyles = function(state)
{
	// LATER: Check if the color has actually changed
	if (state.style != null)
	{
		var values = ['inherit', 'swimlane', 'indicated'];
		var styles = [mxConstants.STYLE_FILLCOLOR, mxConstants.STYLE_STROKECOLOR,
			mxConstants.STYLE_GRADIENTCOLOR, mxConstants.STYLE_FONTCOLOR];
		
		for (var i = 0; i < styles.length; i++)
		{
			if (mxUtils.indexOf(values, state.style[styles[i]]) >= 0)
			{
				return true;
			}
		}
	}
	
	return false;
};

/**
 * Function: resolveColor
 * 
 * Resolves special keywords 'inherit', 'indicated' and 'swimlane' and sets
 * the respective color on the shape.
 */
mxCellRenderer.prototype.resolveColor = function(state, field, key)
{
	var shape = (key == mxConstants.STYLE_FONTCOLOR) ?
		state.text : state.shape;
	
	if (shape != null)
	{
		var graph = state.view.graph;
		var value = shape[field];
		var referenced = null;
		
		if (value == 'inherit')
		{
			referenced = graph.model.getParent(state.cell);
		}
		else if (value == 'swimlane')
		{
			shape[field] = (key == mxConstants.STYLE_STROKECOLOR ||
				key == mxConstants.STYLE_FONTCOLOR) ?
				'#000000' : '#ffffff';
			
			if (graph.model.getTerminal(state.cell, false) != null)
			{
				referenced = graph.model.getTerminal(state.cell, false);
			}
			else
			{
				referenced = state.cell;
			}
			
			referenced = graph.getSwimlane(referenced);
			key = graph.swimlaneIndicatorColorAttribute;
		}
		else if (value == 'indicated' && state.shape != null)
		{
			shape[field] = state.shape.indicatorColor;
		}
		else if (key != mxConstants.STYLE_FILLCOLOR &&
			value == mxConstants.STYLE_FILLCOLOR &&
			state.shape != null)
		{
			shape[field] = state.style[mxConstants.STYLE_FILLCOLOR];
		}
		else if (key != mxConstants.STYLE_STROKECOLOR &&
			value == mxConstants.STYLE_STROKECOLOR &&
			state.shape != null)
		{
			shape[field] = state.style[mxConstants.STYLE_STROKECOLOR];
		}
	
		if (referenced != null)
		{
			var rstate = graph.getView().getState(referenced);
			shape[field] = null;
			
			if (rstate != null)
			{
				var rshape = (key == mxConstants.STYLE_FONTCOLOR) ? rstate.text : rstate.shape;
				
				if (rshape != null && field != 'indicatorColor')
				{
					shape[field] = rshape[field];
				}
				else
				{
					shape[field] = rstate.style[key];
				}
			}
		}
	}
};

/**
 * Function: getLabelValue
 * 
 * Returns the value to be used for the label.
 * 
 * Parameters:
 * 
 * state - <mxCellState> for which the label should be created.
 */
mxCellRenderer.prototype.getLabelValue = function(state)
{
	return state.view.graph.getLabel(state.cell);
};

/**
 * Function: createLabel
 * 
 * Creates the label for the given cell state.
 * 
 * Parameters:
 * 
 * state - <mxCellState> for which the label should be created.
 */
mxCellRenderer.prototype.createLabel = function(state, value)
{
	var graph = state.view.graph;
	var isEdge = graph.getModel().isEdge(state.cell);
	
	if (state.style[mxConstants.STYLE_FONTSIZE] > 0 || state.style[mxConstants.STYLE_FONTSIZE] == null)
	{
		// Avoids using DOM node for empty labels
		var isForceHtml = (graph.isHtmlLabel(state.cell) || (value != null && mxUtils.isNode(value)));

		state.text = new this.defaultTextShape(value, new mxRectangle(),
				(state.style[mxConstants.STYLE_ALIGN] || mxConstants.ALIGN_CENTER),
				graph.getVerticalAlign(state),
				state.style[mxConstants.STYLE_FONTCOLOR],
				state.style[mxConstants.STYLE_FONTFAMILY],
				state.style[mxConstants.STYLE_FONTSIZE],
				state.style[mxConstants.STYLE_FONTSTYLE],
				state.style[mxConstants.STYLE_SPACING],
				state.style[mxConstants.STYLE_SPACING_TOP],
				state.style[mxConstants.STYLE_SPACING_RIGHT],
				state.style[mxConstants.STYLE_SPACING_BOTTOM],
				state.style[mxConstants.STYLE_SPACING_LEFT],
				state.style[mxConstants.STYLE_HORIZONTAL],
				state.style[mxConstants.STYLE_LABEL_BACKGROUNDCOLOR],
				state.style[mxConstants.STYLE_LABEL_BORDERCOLOR],
				graph.isWrapping(state.cell) && graph.isHtmlLabel(state.cell),
				graph.isLabelClipped(state.cell),
				state.style[mxConstants.STYLE_OVERFLOW],
				state.style[mxConstants.STYLE_LABEL_PADDING],
				mxUtils.getValue(state.style, mxConstants.STYLE_TEXT_DIRECTION, mxConstants.DEFAULT_TEXT_DIRECTION));
		state.text.opacity = mxUtils.getValue(state.style, mxConstants.STYLE_TEXT_OPACITY, 100);
		state.text.dialect = (isForceHtml) ? mxConstants.DIALECT_STRICTHTML : state.view.graph.dialect;
		state.text.style = state.style;
		state.text.state = state;
		this.initializeLabel(state, state.text);
		
		// Workaround for touch devices routing all events for a mouse gesture
		// (down, move, up) via the initial DOM node. IE additionally redirects
		// the event via the initial DOM node but the event source is the node
		// under the mouse, so we need to check if this is the case and force
		// getCellAt for the subsequent mouseMoves and the final mouseUp.
		var forceGetCell = false;
		
		var getState = function(evt)
		{
			var result = state;

			if (mxClient.IS_TOUCH || forceGetCell)
			{
				var x = mxEvent.getClientX(evt);
				var y = mxEvent.getClientY(evt);
				
				// Dispatches the drop event to the graph which
				// consumes and executes the source function
				var pt = mxUtils.convertPoint(graph.container, x, y);
				result = graph.view.getState(graph.getCellAt(pt.x, pt.y));
			}
			
			return result;
		};
		
		// Add handling for special touch device gestures
		mxEvent.addGestureListeners(state.text.node,
			mxUtils.bind(this, function(evt)
			{
				if (this.isLabelEvent(state, evt))
				{
					graph.fireMouseEvent(mxEvent.MOUSE_DOWN, new mxMouseEvent(evt, state));
					forceGetCell = graph.dialect != mxConstants.DIALECT_SVG &&
						mxEvent.getSource(evt).nodeName == 'IMG';
				}
			}),
			mxUtils.bind(this, function(evt)
			{
				if (this.isLabelEvent(state, evt))
				{
					graph.fireMouseEvent(mxEvent.MOUSE_MOVE, new mxMouseEvent(evt, getState(evt)));
				}
			}),
			mxUtils.bind(this, function(evt)
			{
				if (this.isLabelEvent(state, evt))
				{
					graph.fireMouseEvent(mxEvent.MOUSE_UP, new mxMouseEvent(evt, getState(evt)));
					forceGetCell = false;
				}
			})
		);

		// Uses double click timeout in mxGraph for quirks mode
		if (graph.nativeDblClickEnabled)
		{
			mxEvent.addListener(state.text.node, 'dblclick',
				mxUtils.bind(this, function(evt)
				{
					if (this.isLabelEvent(state, evt))
					{
						graph.dblClick(evt, state);
						mxEvent.consume(evt);
					}
				})
			);
		}
	}
};

/**
 * Function: initializeLabel
 * 
 * Initiailzes the label with a suitable container.
 * 
 * Parameters:
 * 
 * state - <mxCellState> whose label should be initialized.
 */
mxCellRenderer.prototype.initializeLabel = function(state, shape)
{
	if (mxClient.IS_SVG && mxClient.NO_FO && shape.dialect != mxConstants.DIALECT_SVG)
	{
		shape.init(state.view.graph.container);
	}
	else
	{
		shape.init(state.view.getDrawPane());
	}
};

/**
 * Function: createCellOverlays
 * 
 * Creates the actual shape for showing the overlay for the given cell state.
 * 
 * Parameters:
 * 
 * state - <mxCellState> for which the overlay should be created.
 */
mxCellRenderer.prototype.createCellOverlays = function(state)
{
	var graph = state.view.graph;
	var overlays = graph.getCellOverlays(state.cell);
	var dict = null;
	
	if (overlays != null)
	{
		dict = new mxDictionary();
		
		for (var i = 0; i < overlays.length; i++)
		{
			var shape = (state.overlays != null) ? state.overlays.remove(overlays[i]) : null;
			
			if (shape == null)
			{
				var tmp = new mxImageShape(new mxRectangle(), overlays[i].image.src);
				tmp.dialect = state.view.graph.dialect;
				tmp.preserveImageAspect = false;
				tmp.overlay = overlays[i];
				this.initializeOverlay(state, tmp);
				this.installCellOverlayListeners(state, overlays[i], tmp);
	
				if (overlays[i].cursor != null)
				{
					tmp.node.style.cursor = overlays[i].cursor;
				}
				
				dict.put(overlays[i], tmp);
			}
			else
			{
				dict.put(overlays[i], shape);
			}
		}
	}
	
	// Removes unused
	if (state.overlays != null)
	{
		state.overlays.visit(function(id, shape)
		{
			shape.destroy();
		});
	}
	
	state.overlays = dict;
};

/**
 * Function: initializeOverlay
 * 
 * Initializes the given overlay.
 * 
 * Parameters:
 * 
 * state - <mxCellState> for which the overlay should be created.
 * overlay - <mxImageShape> that represents the overlay.
 */
mxCellRenderer.prototype.initializeOverlay = function(state, overlay)
{
	overlay.init(state.view.getOverlayPane());
};

/**
 * Function: installOverlayListeners
 * 
 * Installs the listeners for the given <mxCellState>, <mxCellOverlay> and
 * <mxShape> that represents the overlay.
 */
mxCellRenderer.prototype.installCellOverlayListeners = function(state, overlay, shape)
{
	var graph  = state.view.graph;
	
	mxEvent.addListener(shape.node, 'click', function (evt)
	{
		if (graph.isEditing())
		{
			graph.stopEditing(!graph.isInvokesStopCellEditing());
		}
		
		overlay.fireEvent(new mxEventObject(mxEvent.CLICK,
				'event', evt, 'cell', state.cell));
	});
	
	mxEvent.addGestureListeners(shape.node,
		function (evt)
		{
			mxEvent.consume(evt);
		},
		function (evt)
		{
			graph.fireMouseEvent(mxEvent.MOUSE_MOVE,
				new mxMouseEvent(evt, state));
		});
	
	if (mxClient.IS_TOUCH)
	{
		mxEvent.addListener(shape.node, 'touchend', function (evt)
		{
			overlay.fireEvent(new mxEventObject(mxEvent.CLICK,
					'event', evt, 'cell', state.cell));
		});
	}
};

/**
 * Function: createControl
 * 
 * Creates the control for the given cell state.
 * 
 * Parameters:
 * 
 * state - <mxCellState> for which the control should be created.
 */
mxCellRenderer.prototype.createControl = function(state)
{
	var graph = state.view.graph;
	var image = graph.getFoldingImage(state);
	
	if (graph.foldingEnabled && image != null)
	{
		if (state.control == null)
		{
			var b = new mxRectangle(0, 0, image.width, image.height);
			state.control = new mxImageShape(b, image.src);
			state.control.preserveImageAspect = false;
			state.control.dialect = graph.dialect;

			this.initControl(state, state.control, true, this.createControlClickHandler(state));
		}
	}
	else if (state.control != null)
	{
		state.control.destroy();
		state.control = null;
	}
};

/**
 * Function: createControlClickHandler
 * 
 * Hook for creating the click handler for the folding icon.
 * 
 * Parameters:
 * 
 * state - <mxCellState> whose control click handler should be returned.
 */
mxCellRenderer.prototype.createControlClickHandler = function(state)
{
	var graph = state.view.graph;
	
	return mxUtils.bind(this, function (evt)
	{
		if (this.forceControlClickHandler || graph.isEnabled())
		{
			var collapse = !graph.isCellCollapsed(state.cell);
			graph.foldCells(collapse, false, [state.cell], null, evt);
			mxEvent.consume(evt);
		}
	});
};

/**
 * Function: initControl
 * 
 * Initializes the given control and returns the corresponding DOM node.
 * 
 * Parameters:
 * 
 * state - <mxCellState> for which the control should be initialized.
 * control - <mxShape> to be initialized.
 * handleEvents - Boolean indicating if mousedown and mousemove should fire events via the graph.
 * clickHandler - Optional function to implement clicks on the control.
 */
mxCellRenderer.prototype.initControl = function(state, control, handleEvents, clickHandler)
{
	var graph = state.view.graph;
	
	// In the special case where the label is in HTML and the display is SVG the image
	// should go into the graph container directly in order to be clickable. Otherwise
	// it is obscured by the HTML label that overlaps the cell.
	var isForceHtml = graph.isHtmlLabel(state.cell) && mxClient.NO_FO &&
		graph.dialect == mxConstants.DIALECT_SVG;

	if (isForceHtml)
	{
		control.dialect = mxConstants.DIALECT_PREFERHTML;
		control.init(graph.container);
		control.node.style.zIndex = 1;
	}
	else
	{
		control.init(state.view.getOverlayPane());
	}

	var node = control.innerNode || control.node;
	
	// Workaround for missing click event on iOS is to check tolerance below
	if (clickHandler != null && !mxClient.IS_IOS)
	{
		if (graph.isEnabled())
		{
			node.style.cursor = 'pointer';
		}
		
		mxEvent.addListener(node, 'click', clickHandler);
	}
	
	if (handleEvents)
	{
		var first = null;

		mxEvent.addGestureListeners(node,
			function (evt)
			{
				first = new mxPoint(mxEvent.getClientX(evt), mxEvent.getClientY(evt));
				graph.fireMouseEvent(mxEvent.MOUSE_DOWN, new mxMouseEvent(evt, state));
				mxEvent.consume(evt);
			},
			function (evt)
			{
				graph.fireMouseEvent(mxEvent.MOUSE_MOVE, new mxMouseEvent(evt, state));
			},
			function (evt)
			{
				graph.fireMouseEvent(mxEvent.MOUSE_UP, new mxMouseEvent(evt, state));
				mxEvent.consume(evt);
			});
		
		// Uses capture phase for event interception to stop bubble phase
		if (clickHandler != null && mxClient.IS_IOS)
		{
			node.addEventListener('touchend', function(evt)
			{
				if (first != null)
				{
					var tol = graph.tolerance;
					
					if (Math.abs(first.x - mxEvent.getClientX(evt)) < tol &&
						Math.abs(first.y - mxEvent.getClientY(evt)) < tol)
					{
						clickHandler.call(clickHandler, evt);
						mxEvent.consume(evt);
					}
				}
			}, true);
		}
	}
	
	return node;
};

/**
 * Function: isShapeEvent
 * 
 * Returns true if the event is for the shape of the given state. This
 * implementation always returns true.
 * 
 * Parameters:
 * 
 * state - <mxCellState> whose shape fired the event.
 * evt - Mouse event which was fired.
 */
mxCellRenderer.prototype.isShapeEvent = function(state, evt)
{
	return true;
};

/**
 * Function: isLabelEvent
 * 
 * Returns true if the event is for the label of the given state. This
 * implementation always returns true.
 * 
 * Parameters:
 * 
 * state - <mxCellState> whose label fired the event.
 * evt - Mouse event which was fired.
 */
mxCellRenderer.prototype.isLabelEvent = function(state, evt)
{
	return true;
};

/**
 * Function: installListeners
 * 
 * Installs the event listeners for the given cell state.
 * 
 * Parameters:
 * 
 * state - <mxCellState> for which the event listeners should be isntalled.
 */
mxCellRenderer.prototype.installListeners = function(state)
{
	var graph = state.view.graph;

	// Workaround for touch devices routing all events for a mouse
	// gesture (down, move, up) via the initial DOM node. Same for
	// HTML images in all IE versions (VML images are working).
	var getState = function(evt)
	{
		var result = state;
		
		if ((graph.dialect != mxConstants.DIALECT_SVG && mxEvent.getSource(evt).nodeName == 'IMG') || mxClient.IS_TOUCH)
		{
			var x = mxEvent.getClientX(evt);
			var y = mxEvent.getClientY(evt);
			
			// Dispatches the drop event to the graph which
			// consumes and executes the source function
			var pt = mxUtils.convertPoint(graph.container, x, y);
			result = graph.view.getState(graph.getCellAt(pt.x, pt.y));
		}
		
		return result;
	};

	mxEvent.addGestureListeners(state.shape.node,
		mxUtils.bind(this, function(evt)
		{
			if (this.isShapeEvent(state, evt))
			{
				graph.fireMouseEvent(mxEvent.MOUSE_DOWN, new mxMouseEvent(evt, state));
			}
		}),
		mxUtils.bind(this, function(evt)
		{
			if (this.isShapeEvent(state, evt))
			{
				graph.fireMouseEvent(mxEvent.MOUSE_MOVE, new mxMouseEvent(evt, getState(evt)));
			}
		}),
		mxUtils.bind(this, function(evt)
		{
			if (this.isShapeEvent(state, evt))
			{
				graph.fireMouseEvent(mxEvent.MOUSE_UP, new mxMouseEvent(evt, getState(evt)));
			}
		})
	);
	
	// Uses double click timeout in mxGraph for quirks mode
	if (graph.nativeDblClickEnabled)
	{
		mxEvent.addListener(state.shape.node, 'dblclick',
			mxUtils.bind(this, function(evt)
			{
				if (this.isShapeEvent(state, evt))
				{
					graph.dblClick(evt, state.cell);
					mxEvent.consume(evt);
				}
			})
		);
	}
};

/**
 * Function: redrawLabel
 * 
 * Redraws the label for the given cell state.
 * 
 * Parameters:
 * 
 * state - <mxCellState> whose label should be redrawn.
 */
mxCellRenderer.prototype.redrawLabel = function(state, forced)
{
	var graph = state.view.graph;
	var value = this.getLabelValue(state);
	var wrapping = graph.isWrapping(state.cell);
	var clipping = graph.isLabelClipped(state.cell);
	var isForceHtml = (state.view.graph.isHtmlLabel(state.cell) || (value != null && mxUtils.isNode(value)));
	var dialect = (isForceHtml) ? mxConstants.DIALECT_STRICTHTML : state.view.graph.dialect;
	var overflow = state.style[mxConstants.STYLE_OVERFLOW] || 'visible';

	if (state.text != null && (state.text.wrap != wrapping || state.text.clipped != clipping ||
		state.text.overflow != overflow || state.text.dialect != dialect))
	{
		state.text.destroy();
		state.text = null;
	}
	
	if (state.text == null && value != null && (mxUtils.isNode(value) || value.length > 0))
	{
		this.createLabel(state, value);
	}
	else if (state.text != null && (value == null || value.length == 0))
	{
		state.text.destroy();
		state.text = null;
	}

	if (state.text != null)
	{
		// Forced is true if the style has changed, so to get the updated
		// result in getLabelBounds we apply the new style to the shape
		if (forced)
		{
			// Checks if a full repaint is needed
			if (state.text.lastValue != null && this.isTextShapeInvalid(state, state.text))
			{
				// Forces a full repaint
				state.text.lastValue = null;
			}
			
			state.text.resetStyles();
			state.text.apply(state);
			
			// Special case where value is obtained via hook in graph
			state.text.valign = graph.getVerticalAlign(state);
		}
		
		var bounds = this.getLabelBounds(state);
		var nextScale = this.getTextScale(state);
		this.resolveColor(state, 'color', mxConstants.STYLE_FONTCOLOR);
		
		if (forced || state.text.value != value || state.text.isWrapping != wrapping ||
			state.text.overflow != overflow || state.text.isClipping != clipping ||
			state.text.scale != nextScale || state.text.dialect != dialect ||
			state.text.bounds == null || !state.text.bounds.equals(bounds))
		{
			state.text.dialect = dialect;
			state.text.value = value;
			state.text.bounds = bounds;
			state.text.scale = nextScale;
			state.text.wrap = wrapping;
			state.text.clipped = clipping;
			state.text.overflow = overflow;
			
			// Preserves visible state
			var vis = state.text.node.style.visibility;
			this.redrawLabelShape(state.text);
			state.text.node.style.visibility = vis;
		}
	}
};

/**
 * Function: isTextShapeInvalid
 * 
 * Returns true if the style for the text shape has changed.
 * 
 * Parameters:
 * 
 * state - <mxCellState> whose label should be checked.
 * shape - <mxText> shape to be checked.
 */
mxCellRenderer.prototype.isTextShapeInvalid = function(state, shape)
{
	function check(property, stylename, defaultValue)
	{
		var result = false;
		
		// Workaround for spacing added to directional spacing
		if (stylename == 'spacingTop' || stylename == 'spacingRight' ||
			stylename == 'spacingBottom' || stylename == 'spacingLeft')
		{
			result = parseFloat(shape[property]) - parseFloat(shape.spacing) !=
				(state.style[stylename] || defaultValue);
		}
		else
		{
			result = shape[property] != (state.style[stylename] || defaultValue);
		}
		
		return result;
	};

	return check('fontStyle', mxConstants.STYLE_FONTSTYLE, mxConstants.DEFAULT_FONTSTYLE) ||
		check('family', mxConstants.STYLE_FONTFAMILY, mxConstants.DEFAULT_FONTFAMILY) ||
		check('size', mxConstants.STYLE_FONTSIZE, mxConstants.DEFAULT_FONTSIZE) ||
		check('color', mxConstants.STYLE_FONTCOLOR, 'black') ||
		check('align', mxConstants.STYLE_ALIGN, '') ||
		check('valign', mxConstants.STYLE_VERTICAL_ALIGN, '') ||
		check('spacing', mxConstants.STYLE_SPACING, 2) ||
		check('spacingTop', mxConstants.STYLE_SPACING_TOP, 0) ||
		check('spacingRight', mxConstants.STYLE_SPACING_RIGHT, 0) ||
		check('spacingBottom', mxConstants.STYLE_SPACING_BOTTOM, 0) ||
		check('spacingLeft', mxConstants.STYLE_SPACING_LEFT, 0) ||
		check('horizontal', mxConstants.STYLE_HORIZONTAL, true) ||
		check('background', mxConstants.STYLE_LABEL_BACKGROUNDCOLOR) ||
		check('border', mxConstants.STYLE_LABEL_BORDERCOLOR) ||
		check('opacity', mxConstants.STYLE_TEXT_OPACITY, 100) ||
		check('textDirection', mxConstants.STYLE_TEXT_DIRECTION, mxConstants.DEFAULT_TEXT_DIRECTION);
};

/**
 * Function: redrawLabelShape
 * 
 * Called to invoked redraw on the given text shape.
 * 
 * Parameters:
 * 
 * shape - <mxText> shape to be redrawn.
 */
mxCellRenderer.prototype.redrawLabelShape = function(shape)
{
	shape.redraw();
};

/**
 * Function: getTextScale
 * 
 * Returns the scaling used for the label of the given state
 * 
 * Parameters:
 * 
 * state - <mxCellState> whose label scale should be returned.
 */
mxCellRenderer.prototype.getTextScale = function(state)
{
	return state.view.scale;
};

/**
 * Function: getLabelBounds
 * 
 * Returns the bounds to be used to draw the label of the given state.
 * 
 * Parameters:
 * 
 * state - <mxCellState> whose label bounds should be returned.
 */
mxCellRenderer.prototype.getLabelBounds = function(state)
{
	var graph = state.view.graph;
	var scale = state.view.scale;
	var isEdge = graph.getModel().isEdge(state.cell);
	var bounds = new mxRectangle(state.absoluteOffset.x, state.absoluteOffset.y);

	if (isEdge)
	{
		var spacing = state.text.getSpacing();
		bounds.x += spacing.x * scale;
		bounds.y += spacing.y * scale;
		
		var geo = graph.getCellGeometry(state.cell);
		
		if (geo != null)
		{
			bounds.width = Math.max(0, geo.width * scale);
			bounds.height = Math.max(0, geo.height * scale);
		}
	}
	else
	{
		// Inverts label position
		if (state.text.isPaintBoundsInverted())
		{
			var tmp = bounds.x;
			bounds.x = bounds.y;
			bounds.y = tmp;
		}
		
		bounds.x += state.x;
		bounds.y += state.y;
		
		// Minimum of 1 fixes alignment bug in HTML labels
		bounds.width = Math.max(1, state.width);
		bounds.height = Math.max(1, state.height);
	}

	if (state.text.isPaintBoundsInverted())
	{
		// Rotates around center of state
		var t = (state.width - state.height) / 2;
		bounds.x += t;
		bounds.y -= t;
		var tmp = bounds.width;
		bounds.width = bounds.height;
		bounds.height = tmp;
	}
	
	// Shape can modify its label bounds
	if (state.shape != null)
	{
		var hpos = mxUtils.getValue(state.style, mxConstants.STYLE_LABEL_POSITION, mxConstants.ALIGN_CENTER);
		var vpos = mxUtils.getValue(state.style, mxConstants.STYLE_VERTICAL_LABEL_POSITION, mxConstants.ALIGN_MIDDLE);
		
		if (hpos == mxConstants.ALIGN_CENTER && vpos == mxConstants.ALIGN_MIDDLE)
		{
			bounds = state.shape.getLabelBounds(bounds);
		}
	}
	
	// Label width style overrides actual label width
	var lw = mxUtils.getValue(state.style, mxConstants.STYLE_LABEL_WIDTH, null);
	
	if (lw != null)
	{
		bounds.width = parseFloat(lw) * scale;
	}
	
	if (!isEdge)
	{
		this.rotateLabelBounds(state, bounds);
	}
	
	return bounds;
};

/**
 * Function: rotateLabelBounds
 * 
 * Adds the shape rotation to the given label bounds and
 * applies the alignment and offsets.
 * 
 * Parameters:
 * 
 * state - <mxCellState> whose label bounds should be rotated.
 * bounds - <mxRectangle> the rectangle to be rotated.
 */
mxCellRenderer.prototype.rotateLabelBounds = function(state, bounds)
{
	bounds.y -= state.text.margin.y * bounds.height;
	bounds.x -= state.text.margin.x * bounds.width;
	
	if (!this.legacySpacing || (state.style[mxConstants.STYLE_OVERFLOW] != 'fill' && state.style[mxConstants.STYLE_OVERFLOW] != 'width'))
	{
		var s = state.view.scale;
		var spacing = state.text.getSpacing();
		bounds.x += spacing.x * s;
		bounds.y += spacing.y * s;
		
		var hpos = mxUtils.getValue(state.style, mxConstants.STYLE_LABEL_POSITION, mxConstants.ALIGN_CENTER);
		var vpos = mxUtils.getValue(state.style, mxConstants.STYLE_VERTICAL_LABEL_POSITION, mxConstants.ALIGN_MIDDLE);
		var lw = mxUtils.getValue(state.style, mxConstants.STYLE_LABEL_WIDTH, null);
		
		bounds.width = Math.max(0, bounds.width - ((hpos == mxConstants.ALIGN_CENTER && lw == null) ? (state.text.spacingLeft * s + state.text.spacingRight * s) : 0));
		bounds.height = Math.max(0, bounds.height - ((vpos == mxConstants.ALIGN_MIDDLE) ? (state.text.spacingTop * s + state.text.spacingBottom * s) : 0));
	}

	var theta = state.text.getTextRotation();

	// Only needed if rotated around another center
	if (theta != 0 && state != null && state.view.graph.model.isVertex(state.cell))
	{
		var cx = state.getCenterX();
		var cy = state.getCenterY();
		
		if (bounds.x != cx || bounds.y != cy)
		{
			var rad = theta * (Math.PI / 180);
			var pt = mxUtils.getRotatedPoint(new mxPoint(bounds.x, bounds.y),
					Math.cos(rad), Math.sin(rad), new mxPoint(cx, cy));
			
			bounds.x = pt.x;
			bounds.y = pt.y;
		}
	}
};

/**
 * Function: redrawCellOverlays
 * 
 * Redraws the overlays for the given cell state.
 * 
 * Parameters:
 * 
 * state - <mxCellState> whose overlays should be redrawn.
 */
mxCellRenderer.prototype.redrawCellOverlays = function(state, forced)
{
	this.createCellOverlays(state);

	if (state.overlays != null)
	{
		var rot = mxUtils.mod(mxUtils.getValue(state.style, mxConstants.STYLE_ROTATION, 0), 90);
        var rad = mxUtils.toRadians(rot);
        var cos = Math.cos(rad);
        var sin = Math.sin(rad);
		
		state.overlays.visit(function(id, shape)
		{
			var bounds = shape.overlay.getBounds(state);
		
			if (!state.view.graph.getModel().isEdge(state.cell))
			{
				if (state.shape != null && rot != 0)
				{
					var cx = bounds.getCenterX();
					var cy = bounds.getCenterY();

					var point = mxUtils.getRotatedPoint(new mxPoint(cx, cy), cos, sin,
			        		new mxPoint(state.getCenterX(), state.getCenterY()));

			        cx = point.x;
			        cy = point.y;
			        bounds.x = Math.round(cx - bounds.width / 2);
			        bounds.y = Math.round(cy - bounds.height / 2);
				}
			}
			
			if (forced || shape.bounds == null || shape.scale != state.view.scale ||
				!shape.bounds.equals(bounds))
			{
				shape.bounds = bounds;
				shape.scale = state.view.scale;
				shape.redraw();
			}
		});
	}
};

/**
 * Function: redrawControl
 * 
 * Redraws the control for the given cell state.
 * 
 * Parameters:
 * 
 * state - <mxCellState> whose control should be redrawn.
 */
mxCellRenderer.prototype.redrawControl = function(state, forced)
{
	var image = state.view.graph.getFoldingImage(state);
	
	if (state.control != null && image != null)
	{
		var bounds = this.getControlBounds(state, image.width, image.height);
		var r = (this.legacyControlPosition) ?
				mxUtils.getValue(state.style, mxConstants.STYLE_ROTATION, 0) :
				state.shape.getTextRotation();
		var s = state.view.scale;
		
		if (forced || state.control.scale != s || !state.control.bounds.equals(bounds) ||
			state.control.rotation != r)
		{
			state.control.rotation = r;
			state.control.bounds = bounds;
			state.control.scale = s;
			
			state.control.redraw();
		}
	}
};

/**
 * Function: getControlBounds
 * 
 * Returns the bounds to be used to draw the control (folding icon) of the
 * given state.
 */
mxCellRenderer.prototype.getControlBounds = function(state, w, h)
{
	if (state.control != null)
	{
		var s = state.view.scale;
		var cx = state.getCenterX();
		var cy = state.getCenterY();
	
		if (!state.view.graph.getModel().isEdge(state.cell))
		{
			cx = state.x + w * s;
			cy = state.y + h * s;
			
			if (state.shape != null)
			{
				// Factor out common code
				var rot = state.shape.getShapeRotation();
				
				if (this.legacyControlPosition)
				{
					rot = mxUtils.getValue(state.style, mxConstants.STYLE_ROTATION, 0);
				}
				else
				{
					if (state.shape.isPaintBoundsInverted())
					{
						var t = (state.width - state.height) / 2;
						cx += t;
						cy -= t;
					}
				}
				
				if (rot != 0)
				{
			        var rad = mxUtils.toRadians(rot);
			        var cos = Math.cos(rad);
			        var sin = Math.sin(rad);
			        
			        var point = mxUtils.getRotatedPoint(new mxPoint(cx, cy), cos, sin,
			        		new mxPoint(state.getCenterX(), state.getCenterY()));
			        cx = point.x;
			        cy = point.y;
				}
			}
		}
		
		return (state.view.graph.getModel().isEdge(state.cell)) ? 
			new mxRectangle(Math.round(cx - w / 2 * s), Math.round(cy - h / 2 * s), Math.round(w * s), Math.round(h * s))
			: new mxRectangle(Math.round(cx - w / 2 * s), Math.round(cy - h / 2 * s), Math.round(w * s), Math.round(h * s));
	}
	
	return null;
};

/**
 * Function: insertStateAfter
 * 
 * Inserts the given array of <mxShapes> after the given nodes in the DOM.
 * 
 * Parameters:
 * 
 * shapes - Array of <mxShapes> to be inserted.
 * node - Node in <drawPane> after which the shapes should be inserted.
 * htmlNode - Node in the graph container after which the shapes should be inserted that
 * will not go into the <drawPane> (eg. HTML labels without foreignObjects).
 */
mxCellRenderer.prototype.insertStateAfter = function(state, node, htmlNode)
{
	var shapes = this.getShapesForState(state);
	
	for (var i = 0; i < shapes.length; i++)
	{
		if (shapes[i] != null && shapes[i].node != null)
		{
			var html = shapes[i].node.parentNode != state.view.getDrawPane() &&
				shapes[i].node.parentNode != state.view.getOverlayPane();
			var temp = (html) ? htmlNode : node;
			
			if (temp != null && temp.nextSibling != shapes[i].node)
			{
				if (temp.nextSibling == null)
				{
					temp.parentNode.appendChild(shapes[i].node);
				}
				else
				{
					temp.parentNode.insertBefore(shapes[i].node, temp.nextSibling);
				}
			}
			else if (temp == null)
			{
				// Special case: First HTML node should be first sibling after canvas
				if (shapes[i].node.parentNode == state.view.graph.container)
				{
					var canvas = state.view.canvas;
					
					while (canvas != null && canvas.parentNode != state.view.graph.container)
					{
						canvas = canvas.parentNode;
					}
					
					if (canvas != null && canvas.nextSibling != null)
					{
						if (canvas.nextSibling != shapes[i].node)
						{
							shapes[i].node.parentNode.insertBefore(shapes[i].node, canvas.nextSibling);
						}
					}
					else
					{
						shapes[i].node.parentNode.appendChild(shapes[i].node);
					}
				}
				else if (shapes[i].node.parentNode != null &&
					shapes[i].node.parentNode.firstChild != null &&
					shapes[i].node.parentNode.firstChild != shapes[i].node)
				{
					// Inserts the node as the first child of the parent to implement the order
					shapes[i].node.parentNode.insertBefore(shapes[i].node, shapes[i].node.parentNode.firstChild);
				}
			}
			
			if (html)
			{
				htmlNode = shapes[i].node;
			}
			else
			{
				node = shapes[i].node;
			}
		}
	}

	return [node, htmlNode];
};

/**
 * Function: getShapesForState
 * 
 * Returns the <mxShapes> for the given cell state in the order in which they should
 * appear in the DOM.
 * 
 * Parameters:
 * 
 * state - <mxCellState> whose shapes should be returned.
 */
mxCellRenderer.prototype.getShapesForState = function(state)
{
	return [state.shape, state.text, state.control];
};

/**
 * Function: redraw
 * 
 * Updates the bounds or points and scale of the shapes for the given cell
 * state. This is called in mxGraphView.validatePoints as the last step of
 * updating all cells.
 * 
 * Parameters:
 * 
 * state - <mxCellState> for which the shapes should be updated.
 * force - Optional boolean that specifies if the cell should be reconfiured
 * and redrawn without any additional checks.
 * rendering - Optional boolean that specifies if the cell should actually
 * be drawn into the DOM. If this is false then redraw and/or reconfigure
 * will not be called on the shape.
 */
mxCellRenderer.prototype.redraw = function(state, force, rendering)
{

	// if(state.cell.cellType == jaConstants.ICON_TYPE_PARALLEL_START || state.cell.cellType == jaConstants.ICON_TYPE_PARALLEL_END || state.cell.cellType == jaConstants.ICON_TYPE_LOOP){
    //     state.width = 30.5
    //     state.height = 30.5;
    // }
	var shapeChanged = this.redrawShape(state, force, rendering);

	if (state.shape != null && (rendering == null || rendering))
	{
		this.redrawLabel(state, shapeChanged);
		this.redrawCellOverlays(state, shapeChanged);
		this.redrawControl(state, shapeChanged);
	}
};

/**
 * Function: redrawShape
 * 
 * Redraws the shape for the given cell state.
 * 
 * Parameters:
 * 
 * state - <mxCellState> whose label should be redrawn.
 */
mxCellRenderer.prototype.redrawShape = function(state, force, rendering)
{
	var model = state.view.graph.model;
	var shapeChanged = false;

	// Forces creation of new shape if shape style has changed
	if (state.shape != null && state.shape.style != null && state.style != null &&
		state.shape.style[mxConstants.STYLE_SHAPE] != state.style[mxConstants.STYLE_SHAPE])
	{
		state.shape.destroy();
		state.shape = null;
	}
	
	if (state.shape == null && state.view.graph.container != null &&
		state.cell != state.view.currentRoot &&
		(model.isVertex(state.cell) || model.isEdge(state.cell)))
	{
		state.shape = this.createShape(state);
		
		if (state.shape != null)
		{
			state.shape.minSvgStrokeWidth = this.minSvgStrokeWidth;
			state.shape.antiAlias = this.antiAlias;
	
			this.createIndicatorShape(state);
			this.initializeShape(state);
			this.createCellOverlays(state);
			this.installListeners(state);
			
			// Forces a refresh of the handler if one exists
			state.view.graph.selectionCellsHandler.updateHandler(state);
		}
	}
	else if (!force && state.shape != null && (!mxUtils.equalEntries(state.shape.style,
		state.style) || this.checkPlaceholderStyles(state)))
	{
		state.shape.resetStyles();
		this.configureShape(state);
		// LATER: Ignore update for realtime to fix reset of current gesture
		state.view.graph.selectionCellsHandler.updateHandler(state);
		force = true;
	}
	
	// Updates indicator shape
	if (state.shape != null && state.shape.indicatorShape !=
		this.getShape(state.view.graph.getIndicatorShape(state)))
	{
		if (state.shape.indicator != null)
		{
			state.shape.indicator.destroy();
			state.shape.indicator = null;
		}
		
		this.createIndicatorShape(state);
		
		if (state.shape.indicatorShape != null)
		{
			state.shape.indicator = new state.shape.indicatorShape();
			state.shape.indicator.dialect = state.shape.dialect;
			state.shape.indicator.init(state.node);
			force = true;
		}
	}

	if (state.shape != null)
	{
		// Handles changes of the collapse icon
		this.createControl(state);
		
		// Redraws the cell if required, ignores changes to bounds if points are
		// defined as the bounds are updated for the given points inside the shape
		if (force || this.isShapeInvalid(state, state.shape))
		{
			if (state.absolutePoints != null)
			{
				state.shape.points = state.absolutePoints.slice();
				state.shape.bounds = null;
			}
			else
			{
				state.shape.points = null;
				state.shape.bounds = new mxRectangle(state.x, state.y, state.width, state.height);
			}

			state.shape.scale = state.view.scale;
			
			if (rendering == null || rendering)
			{
				this.doRedrawShape(state);
			}
			else
			{
				state.shape.updateBoundingBox();
			}
			
			shapeChanged = true;
		}
	}

	return shapeChanged;
};

/**
 * Function: doRedrawShape
 * 
 * Invokes redraw on the shape of the given state.
 */
mxCellRenderer.prototype.doRedrawShape = function(state)
{
	state.shape.redraw();
};

/**
 * Function: isShapeInvalid
 * 
 * Returns true if the given shape must be repainted.
 */
mxCellRenderer.prototype.isShapeInvalid = function(state, shape)
{
	return shape.bounds == null || shape.scale != state.view.scale ||
		(state.absolutePoints == null && !shape.bounds.equals(state)) ||
		(state.absolutePoints != null && !mxUtils.equalPoints(shape.points, state.absolutePoints))
};

/**
 * Function: destroy
 * 
 * Destroys the shapes associated with the given cell state.
 * 
 * Parameters:
 * 
 * state - <mxCellState> for which the shapes should be destroyed.
 */
mxCellRenderer.prototype.destroy = function(state)
{
	if (state.shape != null)
	{
		if (state.text != null)
		{		
			state.text.destroy();
			state.text = null;
		}
		
		if (state.overlays != null)
		{
			state.overlays.visit(function(id, shape)
			{
				shape.destroy();
			});
			
			state.overlays = null;
		}

		if (state.control != null)
		{
			state.control.destroy();
			state.control = null;
		}
		
		state.shape.destroy();
		state.shape = null;
	}
};
