AgrimPrasad · January 27, 2014 06:18
diff --git a/readme.mkd b/readme.mkd
diff --git a/index.html b/index.html
 <!--
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * -->

 <html>
 	<head>
 		<title>Interactive Line Graph</title>
 		<script src="http://d3js.org/d3.v2.js"></script>
 		<!-- 
 			using JQuery for element dimensions
 			This is a small aspect of this example so it can be removed fairly easily if needed.
 		-->
 		<script src="http://code.jquery.com/jquery-1.7.2.min.js"></script>
 		<script src="sample_data.js"></script>
 		<script src="line-graph.js"></script>
 		<link rel="stylesheet" href="style.css" type="text/css">
 		<style>
 			body {
 				font-family: "Helvetica Neue", Helvetica;
 			}
 					
 			p {
 				clear:both;
 				top: 20px;
 			}		
 					
 			div.aGraph {
 				margin-bottom: 30px;
 			}
 		</style>
 	</head>
 	<body>
 	<div id="graph1" class="aGraph" style="position:relative;width:100%;height:400px"></div>
 	
 	<div id="graph2" class="aGraph" style="float:left;position:relative;width:49%;height:200px"></div>
 	<div id="graph3" class="aGraph" style="float:left;position:relative;width:49%;height:200px"></div>

 	<script>
 		/* 
 		 * If running inside bl.ocks.org we want to resize the iframe to fit both graphs
 		 */
 		 if(parent.document.getElementsByTagName("iframe")[0]) {
 			 parent.document.getElementsByTagName("iframe")[0].setAttribute('style', 'height: 650px !important');
 		 }
 	
 		 /*
 		 * Note how the 'data' object is added to here before rendering to provide decoration information.
 		 * <p>
 		 * This is purposefully done here instead of in data.js as an example of how data would come from a server
 		 * and then have presentation information injected into it (rather than as separate arguments in another object)
 		 * and passed into LineGraph.
 		 *
 		 * Also, CSS can be used to style colors etc, but this is also doable via the 'data' object so that the styling
 		 * of different data points can be done in code which is often more natural for display names, legends, line colors etc
 		 */
 		 // add presentation logic for 'data' object using optional data arguments
 		 data["displayNames"] = ["2xx","3xx","4xx","5xx"];
 		 data["colors"] = ["green","orange","red","darkred"];
 		 data["scale"] = "pow";
 		 
 		 // add presentation logic for 'data' object using optional data arguments
 		 data2["displayNames"] = ["2xx","3xx","4xx","5xx"];
 		 data2["colors"] = ["green","orange","red","darkred"];
 		 data2["scale"] = "linear";
 		 
 		 // add presentation logic for 'data' object using optional data arguments
 		 data3["displayNames"] = ["Data1", "Data2"];
 		 data3["axis"] = ["left", "right"];
 		 data3["colors"] = ["#2863bc","#c8801c"];
 		 data3["rounding"] = [2, 0];

 		 // create graph now that we've added presentation config
 		var l1 = new LineGraph({containerId: 'graph1', data: data});
 		var l2 = new LineGraph({containerId: 'graph2', data: data2});
 		var l3 = new LineGraph({containerId: 'graph3', data: data3});
 		
 	setInterval(function() {
 		/*
 		* The following will simulate live updating of the data (see dataA, dataB, dataC etc in data.js which are real examples)
 		* This is being simulated so this example functions standalone without a backend server which generates data such as data.js contains.
 		*/
 		// for each data series ...
 		var newData = [];
 		data.values.forEach(function(dataSeries, index) {
 			// take the first value and move it to the end
 			// and capture the value we're moving so we can send it to the graph as an update
 			var v = dataSeries.shift();
 			dataSeries.push(v);
 			// put this value in newData as an array with 1 value
 			newData[index] = [v];
 		})
 		
 		// we will reuse dataA each time
 		dataA.values = newData;
 		// increment time 1 step
 		dataA.start = dataA.start + dataA.step;
 		dataA.end = dataA.end + dataA.step; 
 					
 		l1.slideData(dataA);
 	}, 2000);

 		
 	</script>



 	</body>
 </html>
diff --git a/line-graph.js b/line-graph.js
 /**
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

 /**
 * Create and draw a new line-graph.
 * 
 * Arguments:
 *	 containerId => id of container to insert SVG into [REQUIRED]
 *	 marginTop => Number of pixels for top margin. [OPTIONAL => Default: 20]
 *	 marginRight => Number of pixels for right margin. [OPTIONAL => Default: 20]
 *	 marginBottom => Number of pixels for bottom margin. [OPTIONAL => Default: 35]
 *	 marginLeft => Number of pixels for left margin. [OPTIONAL => Default: 90]
 *	 data => a dictionary containing the following keys [REQUIRED]
 *		 values => The data array of arrays to graph. [REQUIRED]
 *		 start => The start time in milliseconds since epoch of the data. [REQUIRED]
 *		 end => The end time in milliseconds since epoch of the data. [REQUIRED]
 *		 step => The time in milliseconds between each data value.	 [REQUIRED]	
 *		 names => The metric name for each array of data. [REQUIRED]
 *		 displayNames => Display name for each metric. [OPTIONAL => Default: same as 'names' argument]
 *				Example: ['MetricA', 'MetricB'] 
 *		 axis => Which axis (left/right) to put each metric on. [OPTIONAL => Default: Display all values on single axis]
 *				Example: ['left', 'right', 'right'] to display first metric on left axis, next two on right axis.
 *		 colors => What color to use for each metric. [OPTIONAL => Default: black]
 *				Example: ['blue', 'red'] to display first metric in blue and second in red.
 *		 scale => What scale to display the graph with. [OPTIONAL => Default: linear]
 *				Possible Values: linear, pow, log
 *		 rounding => How many decimal points to round each metric to. [OPTIONAL => Default: Numbers are rounded to whole numbers (0 decimals)]
 *				Example: [2, 1] to display first metric with 2 decimals and second metric with 1. 
 *		 numAxisLabelsPowerScale => Hint for how many labels should be displayed for the Y-axis in Power scale. [OPTIONAL => Default: 6]
 *		 numAxisLabelsLinearScale  => Hint for how many labels should be displayed for the Y-axis in Linear scale. [OPTIONAL => Default: 6]
 *
 * Events (fired from container):
 *	 LineGraph:dataModification => whenever data is changed
 *	 LineGraph:configModification => whenever config is changed
 */
 function LineGraph(argsMap) {
 	/* *************************************************************** */
 	/* public methods */
 	/* *************************************************************** */
 	var self = this;
 	
 	/**
 	 * This allows appending new data points to the end of the lines and sliding them within the time window:
 	 * - x-axis will slide to new range
 	 * - new data will be added to the end of the lines
 	 * - equivalent number of data points will be removed from beginning of lines
 	 * - lines will be transitioned through horizontoal slide to show progression over time
 	 */
 	this.slideData = function(newData) {
 		// validate data
 		var tempData = processDataMap(newData);
 		debug("Existing startTime: " + data.startTime + "  endTime: " + data.endTime);
 		debug("New startTime: " + tempData.startTime + "  endTime: " + tempData.endTime);
 		
 		// validate step is the same on each
 		if(tempData.step != newData.step) {
 			throw new Error("The step size on appended data must be the same as the existing data => " + data.step + " != " + tempData.step);
 		}

 		if(tempData.values[0].length == 0) {
 			throw new Error("There is no data to append.");
 		}
 		
 		var numSteps = tempData.values[0].length;
 		console.log("slide => add num new values: " + numSteps);
 		console.log(tempData.values[0])
 		tempData.values.forEach(function(dataArrays, i) {
 			var existingDataArrayForIndex = data.values[i];
 			dataArrays.forEach(function(v) {
 				console.log("slide => add new value: " + v);
 				// push each new value onto the existing data array
 				existingDataArrayForIndex.push(v);
 				// shift the front value off to compensate for what we just added
 				existingDataArrayForIndex.shift();
 			})
 		})
 		
 		// shift domain by number of data elements we just added
 		// == numElements * step
 		data.startTime = new Date(data.startTime.getTime() + (data.step * numSteps));
 		data.endTime = tempData.endTime;
 		debug("Updated startTime: " + data.startTime + "  endTime: " + data.endTime);
 				
 		/*
 		* The following transition implementation was learned from examples at http://bost.ocks.org/mike/path/
 		* In particular, view the HTML source for the last example on the page inside the tick() function.
 		*/

 		// redraw each of the lines
 			// Transitions are turned off on this since the small steps we're taking
 			// don't actually look good when animated and it uses unnecessary CPU
 			// The quick-steps look cleaner, and keep the axis/line in-sync instead of jittering
 		redrawAxes(false);	
 		redrawLines(false);
 			
 	    // slide the lines left
 	    graph.selectAll("g .lines path")
 	        .attr("transform", "translate(-" + x(numSteps*data.step) + ")");
 		 
 		handleDataUpdate();
 		
 		// fire an event that data was updated
 		$(container).trigger('LineGraph:dataModification')
 	}
 	
 	/**
 	 * This does a full refresh of the data:
 	 * - x-axis will slide to new range
 	 * - lines will change in place
 	 */
 	this.updateData = function(newData) {
 		// data is being replaced, not appended so we re-assign 'data'
 		data = processDataMap(newData);
 		// and then we rebind data.values to the lines
 	    graph.selectAll("g .lines path").data(data.values)
 		
 		// redraw (with transition)
 		redrawAxes(true);
 		// transition is 'false' for lines because the transition is really weird when the data significantly changes
 		// such as going from 700 points to 150 to 400
 		// and because of that we rebind the data anyways which doesn't work with transitions very well at all
 		redrawLines(false);
 		
 		handleDataUpdate();
 		
 		// fire an event that data was updated
 		$(container).trigger('LineGraph:dataModification')
 	}

 	
 	this.switchToPowerScale = function() {
 		yScale = 'pow';
 		redrawAxes(true);
 		redrawLines(true);
 		
 		// fire an event that config was changed
 		$(container).trigger('LineGraph:configModification')
 	}

 	this.switchToLogScale = function() {
 		yScale = 'log';
 		redrawAxes(true);
 		redrawLines(true);
 		
 		// fire an event that config was changed
 		$(container).trigger('LineGraph:configModification')
 	}

 	this.switchToLinearScale = function() {
 		yScale = 'linear';
 		redrawAxes(true);		
 		redrawLines(true);
 		
 		// fire an event that config was changed
 		$(container).trigger('LineGraph:configModification')
 	}
 	
 	/**
 	 * Return the current scale value: pow, log or linear
 	 */
 	this.getScale = function() {
 		return yScale;
 	}

 	
 	
 	/* *************************************************************** */
 	/* private variables */
 	/* *************************************************************** */
 	// the div we insert the graph into
 	var containerId;
 	var container;
 	
 	// functions we use to display and interact with the graphs and lines
 	var graph, x, yLeft, yRight, xAxis, yAxisLeft, yAxisRight, yAxisLeftDomainStart, linesGroup, linesGroupText, lines, lineFunction, lineFunctionSeriesIndex = -1;
 	var yScale = 'linear'; // can be pow, log, linear
 	var scales = [['linear','Linear'], ['pow','Power'], ['log','Log']];
 	var hoverContainer, hoverLine, hoverLineXOffset, hoverLineYOffset, hoverLineGroup;
 	var legendFontSize = 12; // we can resize dynamically to make fit so we remember it here

 	// instance storage of data to be displayed
 	var data;
 		
 	// define dimensions of graph
 	var margin = [-1, -1, -1, -1]; // margins (top, right, bottom, left)
 	var w, h;	 // width & height
 	
 	var transitionDuration = 300;
 	
 	var formatNumber = d3.format(",.0f") // for formatting integers
 	var tickFormatForLogScale = function(d) { return formatNumber(d) };
 	
 	// used to track if the user is interacting via mouse/finger instead of trying to determine
 	// by analyzing various element class names to see if they are visible or not
 	var userCurrentlyInteracting = false;
 	var currentUserPositionX = -1;
 		
 	/* *************************************************************** */
 	/* initialization and validation */
 	/* *************************************************************** */
 	var _init = function() {
 		// required variables that we'll throw an error on if we don't find
 		containerId = getRequiredVar(argsMap, 'containerId');
 		container = document.querySelector('#' + containerId);
 		
 		// margins with defaults (do this before processDataMap since it can modify the margins)
 		margin[0] = getOptionalVar(argsMap, 'marginTop', 20) // marginTop allows fitting the actions, date and top of axis labels
 		margin[1] = getOptionalVar(argsMap, 'marginRight', 20)
 		margin[2] = getOptionalVar(argsMap, 'marginBottom', 35) // marginBottom allows fitting the legend along the bottom
 		margin[3] = getOptionalVar(argsMap, 'marginLeft', 90) // marginLeft allows fitting the axis labels
 		
 		// assign instance vars from dataMap
 		data = processDataMap(getRequiredVar(argsMap, 'data'));
 		
 		/* set the default scale */
 		yScale = data.scale;

 		// do this after processing margins and executing processDataMap above
 		initDimensions();
 		
 		createGraph()
 		//debug("Initialization successful for container: " + containerId)	
 		
 		// window resize listener
 		// de-dupe logic from http://stackoverflow.com/questions/667426/javascript-resize-event-firing-multiple-times-while-dragging-the-resize-handle/668185#668185
 		var TO = false;
 		$(window).resize(function(){
 		 	if(TO !== false)
 		    	clearTimeout(TO);
 		 	TO = setTimeout(handleWindowResizeEvent, 200); // time in miliseconds
 		});
 	}
 	
 	
 	
 	/* *************************************************************** */
 	/* private methods */
 	/* *************************************************************** */

 	/*
 	 * Return a validated data map
 	 * 
 	 * Expects a map like this:
 	 *	 {"start": 1335035400000, "end": 1335294600000, "step": 300000, "values": [[28,22,45,65,34], [45,23,23,45,65]]}
 	 */
 	var processDataMap = function(dataMap) {
 		// assign data values to plot over time
 		var dataValues = getRequiredVar(dataMap, 'values', "The data object must contain a 'values' value with a data array.")
 		var startTime = new Date(getRequiredVar(dataMap, 'start', "The data object must contain a 'start' value with the start time in milliseconds since epoch."))
 		var endTime = new Date(getRequiredVar(dataMap, 'end', "The data object must contain an 'end' value with the end time in milliseconds since epoch."))
 		var step = getRequiredVar(dataMap, 'step', "The data object must contain a 'step' value with the time in milliseconds between each data value.")		
 		var names = getRequiredVar(dataMap, 'names', "The data object must contain a 'names' array with the same length as 'values' with a name for each data value array.")		
 		var displayNames = getOptionalVar(dataMap, 'displayNames', names);
 		var numAxisLabelsPowerScale = getOptionalVar(dataMap, 'numAxisLabelsPowerScale', 6); 
 		var numAxisLabelsLinearScale = getOptionalVar(dataMap, 'numAxisLabelsLinearScale', 6); 
 		
 		var axis = getOptionalVar(dataMap, 'axis', []);
 		// default axis values
 		if(axis.length == 0) {
 			displayNames.forEach(function (v, i) {
 				// set the default to left axis
 				axis[i] = "left";
 			})
 		} else {
 			var hasRightAxis = false;
 			axis.forEach(function(v) {
 				if(v == 'right') {
 					hasRightAxis = true;
 				}
 			})
 			if(hasRightAxis) {
 				// add space to right margin
 				margin[1] = margin[1] + 50;
 			}
 		}

 		
 		var colors = getOptionalVar(dataMap, 'colors', []);
 		// default colors values
 		if(colors.length == 0) {
 			displayNames.forEach(function (v, i) {
 				// set the default
 				colors[i] = "black";
 			})
 		}
 		
 		var maxValues = [];
 		var rounding = getOptionalVar(dataMap, 'rounding', []);
 		// default rounding values
 		if(rounding.length == 0) {
 			displayNames.forEach(function (v, i) {
 				// set the default to 0 decimals
 				rounding[i] = 0;
 			})
 		}
 		
 		/* copy the dataValues array, do NOT assign the reference otherwise we modify the original source when we shift/push data */
 		var newDataValues = [];
 		dataValues.forEach(function (v, i) {
 			newDataValues[i] = v.slice(0);
 			maxValues[i] = d3.max(newDataValues[i])
 		})

 		

 		
 		return {
 			"values" : newDataValues,
 			"startTime" : startTime,
 			"endTime" : endTime,
 			"step" : step,
 			"names" : names,
 			"displayNames": displayNames,
 			"axis" : axis,
 			"colors": colors,
 			"scale" : getOptionalVar(dataMap, 'scale', yScale),
 			"maxValues" : maxValues,
 			"rounding" : rounding,
 			"numAxisLabelsLinearScale": numAxisLabelsLinearScale,
 			"numAxisLabelsPowerScale": numAxisLabelsPowerScale
 		}
 	}
 	
 	var redrawAxes = function(withTransition) {
 		initY();
 		initX();
 		
 		if(withTransition) {
 			// slide x-axis to updated location
 			graph.selectAll("g .x.axis").transition()
 			.duration(transitionDuration)
 			.ease("linear")
 			.call(xAxis)				  
 		
 			// slide y-axis to updated location
 			graph.selectAll("g .y.axis.left").transition()
 			.duration(transitionDuration)
 			.ease("linear")
 			.call(yAxisLeft)
 			
 			if(yAxisRight != undefined) {
 				// slide y-axis to updated location
 				graph.selectAll("g .y.axis.right").transition()
 				.duration(transitionDuration)
 				.ease("linear")
 				.call(yAxisRight)
 			}
 		} else {
 			// slide x-axis to updated location
 			graph.selectAll("g .x.axis")
 			.call(xAxis)				  
 		
 			// slide y-axis to updated location
 			graph.selectAll("g .y.axis.left")
 			.call(yAxisLeft)

 			if(yAxisRight != undefined) {			
 				// slide y-axis to updated location
 				graph.selectAll("g .y.axis.right")
 				.call(yAxisRight)
 			}
 		}
 	}
 	
 	var redrawLines = function(withTransition) {
 		/**
 		* This is a hack to deal with the left/right axis.
 		*
 		* See createGraph for a larger comment explaining this. 
 		*
 		* Yes, it's ugly. If you can suggest a better solution please do.
 		*/
 		lineFunctionSeriesIndex  =-1;
 		
 		// redraw lines
 		if(withTransition) {
 			graph.selectAll("g .lines path")
 			.transition()
 				.duration(transitionDuration)
 				.ease("linear")
 				.attr("d", lineFunction)
 				.attr("transform", null);
 		} else {
 			graph.selectAll("g .lines path")
 				.attr("d", lineFunction)
 				.attr("transform", null);
 		}
 	}
 	
 	/*
 	 * Allow re-initializing the y function at any time.
 	 *  - it will properly determine what scale is being used based on last user choice (via public switchScale methods)
 	 */
 	var initY = function() {
 		initYleft();
 		initYright();
 	}
 	
 	var initYleft = function() {
 		var maxYscaleLeft = calculateMaxY(data, 'left')
 		//debug("initY => maxYscale: " + maxYscaleLeft);
 		var numAxisLabels = 6;
 		if(yScale == 'pow') {
 			yLeft = d3.scale.pow().exponent(0.3).domain([0, maxYscaleLeft]).range([h, 0]).nice();	
 			numAxisLabels = data.numAxisLabelsPowerScale;
 		} else if(yScale == 'log') {
 			// we can't have 0 so will represent 0 with a very small number
 			// 0.1 works to represent 0, 0.01 breaks the tickFormatter
 			yLeft = d3.scale.log().domain([0.1, maxYscaleLeft]).range([h, 0]).nice();	
 		} else if(yScale == 'linear') {
 			yLeft = d3.scale.linear().domain([0, maxYscaleLeft]).range([h, 0]).nice();
 			numAxisLabels = data.numAxisLabelsLinearScale;
 		}

 		yAxisLeft = d3.svg.axis().scale(yLeft).ticks(numAxisLabels, tickFormatForLogScale).orient("left");
 	}
 	
 	var initYright = function() {
 		var maxYscaleRight = calculateMaxY(data, 'right')
 		// only create the right axis if it has values
 		if(maxYscaleRight != undefined) {
 			//debug("initY => maxYscale: " + maxYscaleRight);
 			var numAxisLabels = 6;
 			if(yScale == 'pow') {
 				yRight = d3.scale.pow().exponent(0.3).domain([0, maxYscaleRight]).range([h, 0]).nice();		
 				numAxisLabels = data.numAxisLabelsPowerScale;
 			} else if(yScale == 'log') {
 				// we can't have 0 so will represent 0 with a very small number
 				// 0.1 works to represent 0, 0.01 breaks the tickFormatter
 				yRight = d3.scale.log().domain([0.1, maxYscaleRight]).range([h, 0]).nice();	
 			} else if(yScale == 'linear') {
 				yRight = d3.scale.linear().domain([0, maxYscaleRight]).range([h, 0]).nice();
 				numAxisLabels = data.numAxisLabelsLinearScale;
 			}
 			
 			yAxisRight = d3.svg.axis().scale(yRight).ticks(numAxisLabels, tickFormatForLogScale).orient("right");
 		}
 	}
 	
 	
 	
 	/*
 	 * Whenever we add/update data we want to re-calculate if the max Y scale has changed
 	 */
 	var calculateMaxY = function(data, whichAxis) {
 		// Y scale will fit values from 0-10 within pixels h-0 (Note the inverted domain for the y-scale: bigger is up!)
 			// we get the max of the max of values for the given index since we expect an array of arrays

 		// we can shortcut to using data.maxValues since we've already calculated the max of each series in processDataMap

 		var maxValuesForAxis = [];
 		data.maxValues.forEach(function(v, i) {
 			if(data.axis[i] == whichAxis) {
 				maxValuesForAxis.push(v);
 			}
 		})
 		
 		// we now have the max values for the axis we're interested in so get the max of them
 		return d3.max(maxValuesForAxis);
 	}
 	
 	/*
 	 * Allow re-initializing the x function at any time.
 	 */
 	var initX = function() {
 		// X scale starts at epoch time 1335035400000, ends at 1335294600000 with 300s increments
 		x = d3.time.scale().domain([data.startTime, data.endTime]).range([0, w]);
 		
 		// create yAxis (with ticks)
 		xAxis = d3.svg.axis().scale(x).tickSize(-h).tickSubdivide(1);
 			// without ticks
 			//xAxis = d3.svg.axis().scale(x);
 	}

 	/**
 	* Creates the SVG elements and displays the line graph.
 	*
 	* Expects to be called once during instance initialization.
 	*/
 	var createGraph = function() {
 		
 		// Add an SVG element with the desired dimensions and margin.
 		graph = d3.select("#" + containerId).append("svg:svg")
 				.attr("class", "line-graph")
 				.attr("width", w + margin[1] + margin[3])
 				.attr("height", h + margin[0] + margin[2])	
 				.append("svg:g")
 					.attr("transform", "translate(" + margin[3] + "," + margin[0] + ")");

 		initX()		
 		
 		// Add the x-axis.
 		graph.append("svg:g")
 			.attr("class", "x axis")
 			.attr("transform", "translate(0," + h + ")")
 			.call(xAxis);
 			
 		
 		// y is all done in initY because we need to re-assign vars quite often to change scales
 		initY();
 				
 		// Add the y-axis to the left
 		graph.append("svg:g")
 			.attr("class", "y axis left")
 			.attr("transform", "translate(-10,0)")
 			.call(yAxisLeft);
 			
 		if(yAxisRight != undefined) {
 			// Add the y-axis to the right if we need one
 			graph.append("svg:g")
 				.attr("class", "y axis right")
 				.attr("transform", "translate(" + (w+10) + ",0)")
 				.call(yAxisRight);
 		}
 				
 		// create line function used to plot our data
 		lineFunction = d3.svg.line()
 			// assign the X function to plot our line as we wish
 			.x(function(d,i) { 
 				/* 
 				 * Our x value is defined by time and since our data doesn't have per-metric timestamps
 				 * we calculate time as (startTime + the step between metrics * the index)
 				 *
 				 * We also reach out to the persisted 'data' object for time
 				 * since the 'd' passed in here is one of the children, not the parent object
 				 */
 				var _x = x(data.startTime.getTime() + (data.step*i)); 
 				
 				// verbose logging to show what's actually being done
 				//debug("Line X => index: " + i + " scale: " + _x)
 				// return the X coordinate where we want to plot this datapoint
 				return _x;
 			})
 			.y(function(d, i) { 
 				if(yScale == 'log' && d < 0.1) {
 					// log scale can't have 0s, so we set it to the smallest value we set on y
 					d = 0.1;
 				}
 				
 				/**
 				* This is a hack that relies on:
 				*   a) the single-threaded nature of javascript that this will not be interleaved
 				*   b) that lineFunction will always be passed the data[] for all lines in the same way each time
 				*
 				* We then use an external variable to track each time we move from one series to the next
 				* so that we can have its seriesIndex to access information in the data[] object, particularly
 				* so we can determine what axis this data is supposed to be on.
 				*
 				* I didn't want to split the line function into left and right lineFunctions as that would really
 				* complicate the data binding.
 				*
 				* Also ... I can't figure out nested functions to keep it scoped so I had to put lineFunctionSeriesIndex
 				* as a variable in the same scope as lineFunction. Ugly. And worse ... reset it in redrawAxes. 
 				*
 				* Anyone reading this who knows a better solution please let me know.
 				*/
 				if(i == 0) {
 					lineFunctionSeriesIndex++;
 				}
 				var axis = data.axis[lineFunctionSeriesIndex];
 				var _y;
 				if(axis == 'right') {
 					_y = yRight(d); 
 				} else {
 					_y = yLeft(d); 
 				}

 				// verbose logging to show what's actually being done
 				//debug("Line Y => data: " + d + " scale: " + _y)
 				// return the Y coordinate where we want to plot this datapoint
 				return _y;
 			})
 			.defined(function(d) {
 				// handle missing data gracefully
 				// feature added in https://github.com/mbostock/d3/pull/594
 				return d >= 0;
 			});

 		// append a group to contain all lines
 		lines = graph.append("svg:g")
 				.attr("class", "lines")
 			.selectAll("path")
 				.data(data.values); // bind the array of arrays

 		// persist this reference so we don't do the selector every mouse event
 		hoverContainer = container.querySelector('g .lines');
 		
 		
 		$(container).mouseleave(function(event) {
 			handleMouseOutGraph(event);
 		})
 		
 		$(container).mousemove(function(event) {
 			handleMouseOverGraph(event);
 		})		

 					
 		// add a line group for each array of values (it will iterate the array of arrays bound to the data function above)
 		linesGroup = lines.enter().append("g")
 				.attr("class", function(d, i) {
 					return "line_group series_" + i;
 				});
 				
 		// add path (the actual line) to line group
 		linesGroup.append("path")
 				.attr("class", function(d, i) {
 					//debug("Appending line [" + containerId + "]: " + i)
 					return "line series_" + i;
 				})
 				.attr("fill", "none")
 				.attr("stroke", function(d, i) {
 					return data.colors[i];
 				})
 				.attr("d", lineFunction) // use the 'lineFunction' to create the data points in the correct x,y axis
 				.on('mouseover', function(d, i) {
 					handleMouseOverLine(d, i);
 				});
 				
 		// add line label to line group
 		linesGroupText = linesGroup.append("svg:text");
 		linesGroupText.attr("class", function(d, i) {
 				//debug("Appending line [" + containerId + "]: " + i)
 				return "line_label series_" + i;
 			})
 			.text(function(d, i) {
 				return "";
 			});
 			
 		// add a 'hover' line that we'll show as a user moves their mouse (or finger)
 		// so we can use it to show detailed values of each line
 		hoverLineGroup = graph.append("svg:g")
 							.attr("class", "hover-line");
 		// add the line to the group
 		hoverLine = hoverLineGroup
 			.append("svg:line")
 				.attr("x1", 10).attr("x2", 10) // vertical line so same value on each
 				.attr("y1", 0).attr("y2", h); // top to bottom	
 				
 		// hide it by default
 		hoverLine.classed("hide", true);
 			
 		createScaleButtons();
 		createDateLabel();
 		createLegend();		
 		setValueLabelsToLatest();
 	}
 	
 	/**
 	 * Create a legend that displays the name of each line with appropriate color coding
 	 * and allows for showing the current value when doing a mouseOver
 	 */
 	var createLegend = function() {
 		
 		// append a group to contain all lines
 		var legendLabelGroup = graph.append("svg:g")
 				.attr("class", "legend-group")
 			.selectAll("g")
 				.data(data.displayNames)
 			.enter().append("g")
 				.attr("class", "legend-labels");
 				
 		legendLabelGroup.append("svg:text")
 				.attr("class", "legend name")
 				.text(function(d, i) {
 					return d;
 				})
 				.attr("font-size", legendFontSize)
 				.attr("fill", function(d, i) {
 					// return the color for this row
 					return data.colors[i];
 				})
 				.attr("y", function(d, i) {
 					return h+28;
 				})

 				
 		// put in placeholders with 0 width that we'll populate and resize dynamically
 		legendLabelGroup.append("svg:text")
 				.attr("class", "legend value")
 				.attr("font-size", legendFontSize)
 				.attr("fill", function(d, i) {
 					return data.colors[i];
 				})
 				.attr("y", function(d, i) {
 					return h+28;
 				})
 				
 		// x values are not defined here since those get dynamically calculated when data is set in displayValueLabelsForPositionX()
 	}
 	
 	var redrawLegendPosition = function(animate) {
 		var legendText = graph.selectAll('g.legend-group text');
 		if(animate) {
 			legendText.transition()
 			.duration(transitionDuration)
 			.ease("linear")
 			.attr("y", function(d, i) {
 				return h+28;
 			});	
 			
 		} else {
 			legendText.attr("y", function(d, i) {
 				return h+28;
 			});	
 		}	
 	}
 	
 	/**
 	 * Create scale buttons for switching the y-axis
 	 */
 	var createScaleButtons = function() {
 		var cumulativeWidth = 0;		
 		// append a group to contain all lines
 		var buttonGroup = graph.append("svg:g")
 				.attr("class", "scale-button-group")
 			.selectAll("g")
 				.data(scales)
 			.enter().append("g")
 				.attr("class", "scale-buttons")
 			.append("svg:text")
 				.attr("class", "scale-button")
 				.text(function(d, i) {
 					return d[1];
 				})
 				.attr("font-size", "12") // this must be before "x" which dynamically determines width
 				.attr("fill", function(d) {
 					if(d[0] == yScale) {
 						return "black";
 					} else {
 						return "blue";
 					}
 				})
 				.classed("selected", function(d) {
 					if(d[0] == yScale) {
 						return true;
 					} else {
 						return false;
 					}
 				})
 				.attr("x", function(d, i) {
 					// return it at the width of previous labels (where the last one ends)
 					var returnX = cumulativeWidth;
 					// increment cumulative to include this one
 					cumulativeWidth += this.getComputedTextLength()+5;
 					return returnX;
 				})
 				.attr("y", -4)
 				.on('click', function(d, i) {
 					handleMouseClickScaleButton(this, d, i);
 				});
 	}

 	var handleMouseClickScaleButton = function(button, buttonData, index) {
 		if(index == 0) {
 			self.switchToLinearScale();
 		} else if(index == 1) {
 			self.switchToPowerScale();
 		} else if(index == 2) {
 			self.switchToLogScale();
 		}
 		
 		// change text decoration
 		graph.selectAll('.scale-button')
 		.attr("fill", function(d) {
 			if(d[0] == yScale) {
 				return "black";
 			} else {
 				return "blue";
 			}
 		})
 		.classed("selected", function(d) {
 			if(d[0] == yScale) {
 				return true;
 			} else {
 				return false;
 			}
 		})
 		
 	}
 	
 	/**
 	 * Create a data label
 	 */
 	var createDateLabel = function() {
 		var date = new Date(); // placeholder just so we can calculate a valid width
 		// create the date label to the left of the scaleButtons group
 		var buttonGroup = graph.append("svg:g")
 				.attr("class", "date-label-group")
 			.append("svg:text")
 				.attr("class", "date-label")
 				.attr("text-anchor", "end") // set at end so we can position at far right edge and add text from right to left
 				.attr("font-size", "10") 
 				.attr("y", -4)
 				.attr("x", w)
 				.text(date.toDateString() + " " + date.toLocaleTimeString())
 				
 	}

 	
 	/**
 	 * Called when a user mouses over a line.
 	 */
 	var handleMouseOverLine = function(lineData, index) {
 		//debug("MouseOver line [" + containerId + "] => " + index)
 		
 		// user is interacting
 		userCurrentlyInteracting = true;
 	}

 	/**
 	 * Called when a user mouses over the graph.
 	 */
 	var handleMouseOverGraph = function(event) {	
 		var mouseX = event.pageX-hoverLineXOffset;
 		var mouseY = event.pageY-hoverLineYOffset;
 		
 		//debug("MouseOver graph [" + containerId + "] => x: " + mouseX + " y: " + mouseY + "  height: " + h + " event.clientY: " + event.clientY + " offsetY: " + event.offsetY + " pageY: " + event.pageY + " hoverLineYOffset: " + hoverLineYOffset)
 		if(mouseX >= 0 && mouseX <= w && mouseY >= 0 && mouseY <= h) {
 			// show the hover line
 			hoverLine.classed("hide", false);

 			// set position of hoverLine
 			hoverLine.attr("x1", mouseX).attr("x2", mouseX)
 			
 			displayValueLabelsForPositionX(mouseX)
 			
 			// user is interacting
 			userCurrentlyInteracting = true;
 			currentUserPositionX = mouseX;
 		} else {
 			// proactively act as if we've left the area since we're out of the bounds we want
 			handleMouseOutGraph(event)
 		}
 	}
 	
 	
 	var handleMouseOutGraph = function(event) {	
 		// hide the hover-line
 		hoverLine.classed("hide", true);
 		
 		setValueLabelsToLatest();
 		
 		//debug("MouseOut graph [" + containerId + "] => " + mouseX + ", " + mouseY)
 		
 		// user is no longer interacting
 		userCurrentlyInteracting = false;
 		currentUserPositionX = -1;
 	}
 	
 /*  // if we need to support older browsers without pageX/pageY we can use this
 	var getMousePositionFromEvent = function(e, element) {
 		var posx = 0;
 		var posy = 0;
 		if (!e) var e = window.event;
 		if (e.pageX || e.pageY) 	{
 			posx = e.pageX;
 			posy = e.pageY;
 		}
 		else if (e.clientX || e.clientY) 	{
 			posx = e.clientX + document.body.scrollLeft
 				+ document.documentElement.scrollLeft;
 			posy = e.clientY + document.body.scrollTop
 				+ document.documentElement.scrollTop;
 		}
 		
 		return {x: posx, y: posy};
 	}
 */
 	
 	/*
 	* Handler for when data is updated.
 	*/
 	var handleDataUpdate = function() {
 		if(userCurrentlyInteracting) {
 			// user is interacting, so let's update values to wherever the mouse/finger is on the updated data
 			if(currentUserPositionX > -1) {
 				displayValueLabelsForPositionX(currentUserPositionX)
 			}
 		} else {
 			// the user is not interacting with the graph, so we'll update the labels to the latest
 			setValueLabelsToLatest();
 		}
 	}
 	
 	/**
 	* Display the data values at position X in the legend value labels.
 	*/
 	var displayValueLabelsForPositionX = function(xPosition, withTransition) {
 		var animate = false;
 		if(withTransition != undefined) {
 			if(withTransition) {
 				animate = true;
 			}
 		}
 		var dateToShow;
 		var labelValueWidths = [];
 		graph.selectAll("text.legend.value")
 		.text(function(d, i) {
 			var valuesForX = getValueForPositionXFromData(xPosition, i);
 			dateToShow = valuesForX.date;
 			return valuesForX.value;
 		})
 		.attr("x", function(d, i) {
 			labelValueWidths[i] = this.getComputedTextLength();
 		})

 		// position label names
 		var cumulativeWidth = 0;
 		var labelNameEnd = [];
 		graph.selectAll("text.legend.name")
 				.attr("x", function(d, i) {
 					// return it at the width of previous labels (where the last one ends)
 					var returnX = cumulativeWidth;
 					// increment cumulative to include this one + the value label at this index
 					cumulativeWidth += this.getComputedTextLength()+4+labelValueWidths[i]+8;
 					// store where this ends
 					labelNameEnd[i] = returnX + this.getComputedTextLength()+5;
 					return returnX;
 				})

 		// remove last bit of padding from cumulativeWidth
 		cumulativeWidth = cumulativeWidth - 8;

 		if(cumulativeWidth > w) {
 			// decrease font-size to make fit
 			legendFontSize = legendFontSize-1;
 			//debug("making legend fit by decreasing font size to: " + legendFontSize)
 			graph.selectAll("text.legend.name")
 				.attr("font-size", legendFontSize);
 			graph.selectAll("text.legend.value")
 				.attr("font-size", legendFontSize);
 			
 			// recursively call until we get ourselves fitting
 			displayValueLabelsForPositionX(xPosition);
 			return;
 		}

 		// position label values
 		graph.selectAll("text.legend.value")
 		.attr("x", function(d, i) {
 			return labelNameEnd[i];
 		})
 		

 		// show the date
 		graph.select('text.date-label').text(dateToShow.toDateString() + " " + dateToShow.toLocaleTimeString())

 		// move the group of labels to the right side
 		if(animate) {
 			graph.selectAll("g.legend-group g")
 				.transition()
 				.duration(transitionDuration)
 				.ease("linear")
 				.attr("transform", "translate(" + (w-cumulativeWidth) +",0)")
 		} else {
 			graph.selectAll("g.legend-group g")
 				.attr("transform", "translate(" + (w-cumulativeWidth) +",0)")
 		}
 	}
 	
 	/**
 	* Set the value labels to whatever the latest data point is.
 	*/
 	var setValueLabelsToLatest = function(withTransition) {
 		displayValueLabelsForPositionX(w, withTransition);
 	}
 	
 	/**
 	* Convert back from an X position on the graph to a data value from the given array (one of the lines)
 	* Return {value: value, date, date}
 	*/
 	var getValueForPositionXFromData = function(xPosition, dataSeriesIndex) {
 		var d = data.values[dataSeriesIndex]
 		
 		// get the date on x-axis for the current location
 		var xValue = x.invert(xPosition);

 		// Calculate the value from this date by determining the 'index'
 		// within the data array that applies to this value
 		var index = (xValue.getTime() - data.startTime) / data.step;


 		if(index >= d.length) {
 			index = d.length-1;
 		}
 		// The date we're given is interpolated so we have to round off to get the nearest
 		// index in the data array for the xValue we're given.
 		// Once we have the index, we then retrieve the data from the d[] array
 		index = Math.round(index);

 		// bucketDate is the date rounded to the correct 'step' instead of interpolated
 		var bucketDate = new Date(data.startTime.getTime() + data.step * (index+1)); // index+1 as it is 0 based but we need 1-based for this math
 				
 		var v = d[index];

 		var roundToNumDecimals = data.rounding[dataSeriesIndex];

 		return {value: roundNumber(v, roundToNumDecimals), date: bucketDate};
 	}

 	
 	/**
 	 * Called when the window is resized to redraw graph accordingly.
 	 */
 	var handleWindowResizeEvent = function() {
 	 	//debug("Window Resize Event [" + containerId + "] => resizing graph")
 	 	initDimensions();
 		initX();
 		
 		// reset width/height of SVG
 		d3.select("#" + containerId + " svg")
 				.attr("width", w + margin[1] + margin[3])
 				.attr("height", h + margin[0] + margin[2]);

 		// reset transform of x axis
 		graph.selectAll("g .x.axis")
 			.attr("transform", "translate(0," + h + ")");
 			
 		if(yAxisRight != undefined) {
 			// Reset the y-axisRight transform if it exists
 			graph.selectAll("g .y.axis.right")
 				.attr("transform", "translate(" + (w+10) + ",0)");
 		}

 		// reset legendFontSize on window resize so it has a chance to re-calculate to a bigger size if it can now fit 
 		legendFontSize = 12;
 		//debug("making legend fit by decreasing font size to: " + legendFontSize)
 		graph.selectAll("text.legend.name")
 			.attr("font-size", legendFontSize);
 		graph.selectAll("text.legend.value")
 			.attr("font-size", legendFontSize);

 		// move date label
 		graph.select('text.date-label')
 			.transition()
 			.duration(transitionDuration)
 			.ease("linear")
 			.attr("x", w)

 		// redraw the graph with new dimensions
 		redrawAxes(true);
 		redrawLines(true);
 		
 		// reposition legend if necessary
 		redrawLegendPosition(true);
 				
 		// force legend to redraw values
 		setValueLabelsToLatest(true);
 	}

 	/**
 	 * Set height/width dimensions based on container.
 	 */
 	var initDimensions = function() {
 		// automatically size to the container using JQuery to get width/height
 		w = $("#" + containerId).width() - margin[1] - margin[3]; // width
 		h = $("#" + containerId).height() - margin[0] - margin[2]; // height
 		
 		// make sure to use offset() and not position() as we want it relative to the document, not its parent
 		hoverLineXOffset = margin[3]+$(container).offset().left;
 		hoverLineYOffset = margin[0]+$(container).offset().top;
 	}
 	
 	/**
 	* Return the value from argsMap for key or throw error if no value found
 	*/	  
 	var getRequiredVar = function(argsMap, key, message) {
 		if(!argsMap[key]) {
 			if(!message) {
 				throw new Error(key + " is required")
 			} else {
 				throw new Error(message)
 			}
 		} else {
 			return argsMap[key]
 		}
 	}
 	
 	/**
 	* Return the value from argsMap for key or defaultValue if no value found
 	*/
 	var getOptionalVar = function(argsMap, key, defaultValue) {
 		if(!argsMap[key]) {
 			return defaultValue
 		} else {
 			return argsMap[key]
 		}
 	}
 	
 	var error = function(message) {
 		console.log("ERROR: " + message)
 	}

 	var debug = function(message) {
 		console.log("DEBUG: " + message)
 	}
 	
 	/* round a number to X digits: num => the number to round, dec => the number of decimals */
 	/* private */ function roundNumber(num, dec) {
 		var result = Math.round(num*Math.pow(10,dec))/Math.pow(10,dec);
 		var resultAsString = result.toString();
 		if(dec > 0) {
 			if(resultAsString.indexOf('.') == -1) {
 				resultAsString = resultAsString + '.';
 			}
 			// make sure we have a decimal and pad with 0s to match the number we were asked for
 			var indexOfDecimal = resultAsString.indexOf('.');
 			while(resultAsString.length <= (indexOfDecimal+dec)) {
 				resultAsString = resultAsString + '0';
 			}
 		}
 		return resultAsString;
 	};
 	
 	/* *************************************************************** */
 	/* execute init now that everything is defined */
 	/* *************************************************************** */
 	_init();
 };
diff --git a/sample_data.js b/sample_data.js
 /**
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

 		/* 
 		 * sample data to plot over time
 		 */
 		var data = {"start":1336594920000,"end":1336680960000,"step":120000,"names":["Stats_count2xx","Stats_count3xx","Stats_count4xx","Stats_count5xx"],"values":[[15820.0101840488, 15899.7253668067, 16047.4476816121, 16225.0631734631, 16321.0429563369, 16477.289219996, 16372.5034462091, 16420.2024254868, 16499.3156905815, 16422.1844610347, 16419.7447928312, 16602.0198900243, 16795.2846238759, 16708.9466016093, 16709.8158889291, 16796.7377507963, 16814.8517758747, 16944.4126048633, 16959.6935058422, 17249.8381137218, 17589.8424377422, 17531.9557988989, 17441.3403929293, 17316.4010302911, 17346.7236664321, 17430.6259138371, 17451.6104156993, 17583.58587248, 17613.4099078811, 17606.2248380331, 17585.3724344667, 17758.0871611239, 17838.6330766152, 17926.3287042096, 18061.8656942517, 18180.5441958674, 18266.052913289, 18199.5231629554, 18132.5794044834, 18141.4166460033, 18385.5401052213, 18449.9025074614, 18447.4506647813, 18482.1044829091, 18468.1994941392, 18519.2243177982, 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 		/* 
 		 * delta updates to data that would be incrementally appended to the original every 2 minutes (120000ms)
 		 */
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 		var dataB = {"start":1336681200000,"end":1336681200000,"step":120000,"names":["Stats_count2xx","Stats_count3xx","Stats_count4xx","Stats_count5xx"],"values":[[15540.6970523899],[410.530462906806],[21.0841810692307],[26.1008030172405]]};
 		var dataC = {"start":1336681320000,"end":1336681320000,"step":120000,"names":["Stats_count2xx","Stats_count3xx","Stats_count4xx","Stats_count5xx"],"values":[[15641.1082208258],[410.469367403579],[21.1010449137829],[51.24715381879]]};
 		var dataD = {"start":1336681440000,"end":1336681440000,"step":120000,"names":["Stats_count2xx","Stats_count3xx","Stats_count4xx","Stats_count5xx"],"values":[[15814.0450377164],[412.641854739243],[22.5711995438838],[41.9139079953229]]};
 		var dataE = {"start":1336681560000,"end":1336681680000,"step":120000,"names":["Stats_count2xx","Stats_count3xx","Stats_count4xx","Stats_count5xx"],"values":[[15859.6222573285, 15868.8955336875],[412.37113849966, 410.678153589876],[20.9144118654616, 20.6286077453409],[23.0275855057073, 22.9727162887915]]};
 		
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 		var data3 = {"start":1938982200000,"end":1939413600000,"step":600000,"names":["Data1","Data2"],"values":[[2.439, 2.44, 2.54, 2.376, 2.335, 2.356, 2.395, 2.888, 2.96, 3.087, 3.331, 3.423, 3.526, 3.328, 3.164, 3.257, 3.308, 3.47, 3.698, 3.504, 3.433, 3.295, 3.21, 3.366, 3.514, 3.554, 3.416, 3.42, 3.437, 3.328, 3.348, 3.25, 3.235, 3.155, 3.113, 3.091, 3.16, 2.973, 2.86, 2.76, 2.634, 2.604, 2.492, 2.241, 2.168, 2.164, 2.071, 2.009, 2.16, 2.006, 2.018, 2.031, 1.909, 1.925, 1.949, 1.775, 1.787, 1.74, 1.738, 1.674, 1.714, 1.555, 1.514, 1.526, 1.482, 1.494, 1.52, 1.439, 1.432, 1.422, 1.395, 1.413, 1.489, 1.471, 1.483, 1.586, 1.568, 1.693, 1.774, 1.802, 1.877, 1.952, 2.082, 2.161, 2.381, 2.556, 2.611, 2.822, 2.752, 2.894, 2.767, 2.734, 2.721, 2.835, 2.891, 2.796, 2.969, 2.797, 2.752, 2.803, 2.877, 3.012, 3.043, 2.952, 2.866, 2.705, 2.691, 2.762, 2.931, 2.951, 2.977, 3.036, 3.056, 3.673, 4.16, 3.83, 3.7, 3.759, 3.8, 3.816, 3.97, 4.001, 4.01, 3.998, 4.017, 4.135, 4.158, 3.938, 3.824, 3.78, 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diff --git a/style.css b/style.css
 /**
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

 /*
 * The CSS below is intended for the "global" styles of svg.line-graph, not specifics per graph such as color of lines
 * which is expected to come from the data itself (even though it can be done via CSS as well if wanted)
 */


 svg.line-graph text {
 	cursor: default;
 }

 svg.line-graph .hover-line {
 	stroke: #6E7B8B;
 }

 svg.line-graph .hide {
 	opacity: 0;
 }
 				
 svg.line-graph .axis {
  shape-rendering: crispEdges;
 }

 svg.line-graph .x.axis line {
  stroke: #D3D3D3;
 }

 svg.line-graph .x.axis .minor {
  stroke-opacity: .5;
 }

 svg.line-graph .x.axis path {
  display: none;
 }
 			
 svg.line-graph .x.axis text {
 	font-size: 10px;
 }

 svg.line-graph .y.axis line, .y.axis path {
  fill: none;
  stroke: #000;
 }
 			
 svg.line-graph .y.axis text {
 	font-size: 12px;
 }

 svg.line-graph .scale-button:not(.selected):hover {
 	text-decoration: underline;
 	cursor: pointer !important;
 }

 svg.line-graph .date-label {
 	fill: #6E7B8B;
 }
	<!--
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	* -->

	<html>
	<head>
	<title>Interactive Line Graph</title>
	<script src="http://d3js.org/d3.v2.js"></script>
	<!--
	using JQuery for element dimensions
	This is a small aspect of this example so it can be removed fairly easily if needed.
	-->
	<script src="http://code.jquery.com/jquery-1.7.2.min.js"></script>
	<script src="sample_data.js"></script>
	<script src="line-graph.js"></script>
	<link rel="stylesheet" href="style.css" type="text/css">
	<style>
	body {
	font-family: "Helvetica Neue", Helvetica;
	}

	p {
	clear:both;
	top: 20px;
	}

	div.aGraph {
	margin-bottom: 30px;
	}
	</style>
	</head>
	<body>
	<div id="graph1" class="aGraph" style="position:relative;width:100%;height:400px"></div>

	<div id="graph2" class="aGraph" style="float:left;position:relative;width:49%;height:200px"></div>
	<div id="graph3" class="aGraph" style="float:left;position:relative;width:49%;height:200px"></div>

	<script>
	/*
	* If running inside bl.ocks.org we want to resize the iframe to fit both graphs
	*/
	if(parent.document.getElementsByTagName("iframe")[0]) {
	parent.document.getElementsByTagName("iframe")[0].setAttribute('style', 'height: 650px !important');
	}

	/*
	* Note how the 'data' object is added to here before rendering to provide decoration information.
	* <p>
	* This is purposefully done here instead of in data.js as an example of how data would come from a server
	* and then have presentation information injected into it (rather than as separate arguments in another object)
	* and passed into LineGraph.
	*
	* Also, CSS can be used to style colors etc, but this is also doable via the 'data' object so that the styling
	* of different data points can be done in code which is often more natural for display names, legends, line colors etc
	*/
	// add presentation logic for 'data' object using optional data arguments
	data["displayNames"] = ["2xx","3xx","4xx","5xx"];
	data["colors"] = ["green","orange","red","darkred"];
	data["scale"] = "pow";

	// add presentation logic for 'data' object using optional data arguments
	data2["displayNames"] = ["2xx","3xx","4xx","5xx"];
	data2["colors"] = ["green","orange","red","darkred"];
	data2["scale"] = "linear";

	// add presentation logic for 'data' object using optional data arguments
	data3["displayNames"] = ["Data1", "Data2"];
	data3["axis"] = ["left", "right"];
	data3["colors"] = ["#2863bc","#c8801c"];
	data3["rounding"] = [2, 0];

	// create graph now that we've added presentation config
	var l1 = new LineGraph({containerId: 'graph1', data: data});
	var l2 = new LineGraph({containerId: 'graph2', data: data2});
	var l3 = new LineGraph({containerId: 'graph3', data: data3});

	setInterval(function() {
	/*
	* The following will simulate live updating of the data (see dataA, dataB, dataC etc in data.js which are real examples)
	* This is being simulated so this example functions standalone without a backend server which generates data such as data.js contains.
	*/
	// for each data series ...
	var newData = [];
	data.values.forEach(function(dataSeries, index) {
	// take the first value and move it to the end
	// and capture the value we're moving so we can send it to the graph as an update
	var v = dataSeries.shift();
	dataSeries.push(v);
	// put this value in newData as an array with 1 value
	newData[index] = [v];
	})

	// we will reuse dataA each time
	dataA.values = newData;
	// increment time 1 step
	dataA.start = dataA.start + dataA.step;
	dataA.end = dataA.end + dataA.step;

	l1.slideData(dataA);
	}, 2000);


	</script>



	</body>
	</html>