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classroom_movie2.html
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<!DOCTYPE html>
<html lang='en'>
<head>
<meta charset='utf-8'>
<!-- css for styling the d3.slider lib -->
<style type='text/css'>.d3-slider {
position: relative;
font-family: Verdana,Arial,sans-serif;
font-size: 1.1em;
border: 1px solid #aaaaaa;
z-index: 2;
}
.d3-slider-horizontal {
height: .8em;
}
.d3-slider-range {
background:#2980b9;
left:0px;
right:0px;
height: 0.8em;
position: absolute;
}
.d3-slider-range-vertical {
background:#2980b9;
left:0px;
right:0px;
position: absolute;
top:0;
}
.d3-slider-vertical {
width: .8em;
height: 100px;
}
.d3-slider-handle {
position: absolute;
width: 1.2em;
height: 1.2em;
border: 1px solid #d3d3d3;
border-radius: 4px;
background: #eee;
background: linear-gradient(to bottom, #eee 0%, #ddd 100%);
z-index: 3;
cursor: move;
}
.d3-slider-handle:hover {
border: 1px solid #999999;
}
.d3-slider-horizontal .d3-slider-handle {
top: -.3em;
}
.d3-slider-axis {
position: relative;
z-index: 1;
}
.d3-slider-axis-bottom {
top: .8em;
}
.d3-slider-axis-right {
left: .8em;
}
.d3-slider-axis path {
stroke-width: 0;
fill: none;
}
.d3-slider-axis line {
fill: none;
stroke: #aaa;
shape-rendering: crispEdges;
}
.d3-slider-axis text {
font-size: 11px;
}
.d3-slider-vertical .d3-slider-handle {
left: -.25em;
margin-left: 0;
margin-bottom: -.6em;
}</style>
<!-- css for styling the ndtv-d3 render and components -->
<style type='text/css'>.ndtv-fullscreen {
padding: 0;
margin: 0;
width: 100%;
height: 100%;
}
.ndtv-d3-container {
position: relative;
}
.main, .xlab {
text-anchor: middle;
}
.label, .main, .xlab, .tooltip {
font-family: sans-serif;
}
.dragging {
cursor: move;
}
.node {
stroke-width: 1px;
fill: red;
stroke: black;
}
.node, .edge {
cursor: pointer;
/*transition: stroke-width 0.2s ease;*/
}
/*.node:hover, .edge:hover {
stroke-width: 5px !important;
}*/
.edge {
stroke: black;
}
.label {
pointer-events: none;
}
.graph {
position: relative;
overflow: hidden;
}
.key {
padding: 10px;
text-align: center;
}
.controls {
margin: 10px 20px;
height: 40px;
box-sizing: border-box;
position: absolute;
bottom: 0px;
left: 0px;
right: 0px;
}
.play-control-container>div {
width: 25px;
height: 25px;
overflow: hidden;
display: inline-block;
}
.controls .icon, .ndtv-menu-container .icon {
width: 100%;
height: 100%;
cursor: pointer;
}
.controls .icon:hover {
fill: blue;
}
.data_chooser_container {
position: absolute; top: 10px; left: 10px;
}
.play-control-container {
float: right;
background: #ccc;
border-radius: 5px;
padding: 7px;
padding-bottom: 3px;
box-sizing: border-box;
}
.ndtv-d3-container {
position: relative;
box-sizing: border-box;
border: 1px solid;
}
.slider-control-container {
margin-right: 160px;
box-sizing: border-box;
}
.d3-slider-handle {
min-width: 10px;
}
.d3-slider-axis {
height: 20px;
}
.tooltip {
display: none;
position: absolute;
z-index: 1000;
padding: 10px 10px;
background: rgba(255,255,255, 1);
border: 1px solid #666;
opacity: 1; /* this is to prevent bootstrap's tooltip rule from overrding */
}
.frameInfo {
display: none;
position: absolute;
bottom: 0px;
left: 0px;
padding: 5px;
}
.durationControl {
width: 150px;
margin-bottom: 20px;
}
.container .screen {
opacity: 0;
pointer-events: none;
fill: none;
}
.container .screen.network-selected {
opacity: .6;
}
.ndtv-menu-container {
position: absolute;
top: 5px;
right: 5px;
}
.ndtv-menu-icon {
width: 25px;
height: 25px;
float: right;
z-index: 100;
}
.ndtv-menu-icon.menu-active {
background: #fff;
border: 1px solid #666;
border-bottom: 1px solid #fff;
}
.ndtv-menu {
background: white;
border: 1px solid #666;
box-shadow: 0px 2px 4px rgba(0,0,0,0.2);
padding: 10px;
margin-top: 25px;
display: none;
}
.menu-item {
padding: 10px 0px;
border-bottom: 1px solid #CCC;
}
.menu-item:first-child {
padding-top: 0px;
}
.menu-item:last-child {
padding-bottom: 0px;
border: none;
}
</style>
<!-- minimized d3.js library -->
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//# sourceMappingURL=jquery.min.map</script>
<!-- d3.slider.js library -->
<script>/*
D3.js Slider
Inspired by jQuery UI Slider
Copyright (c) 2013, Bjorn Sandvik - http://blog.thematicmapping.org
BSD license: http://opensource.org/licenses/BSD-3-Clause
*/
(function (root, factory) {
if (typeof define === 'function' && define.amd) {
// AMD. Register as an anonymous module.
define(['d3'], factory);
} else if (typeof exports === 'object') {
if (process.browser) {
// Browserify. Import css too using cssify.
require('./d3.slider.css');
}
// Node. Does not work with strict CommonJS, but
// only CommonJS-like environments that support module.exports,
// like Node.
module.exports = factory(require('d3'));
} else {
// Browser globals (root is window)
root.d3.slider = factory(root.d3);
}
}(this, function (d3) {
return function module() {
"use strict";
// Public variables width default settings
var min = 0,
max = 100,
step = 0.01,
animate = true,
orientation = "horizontal",
axis = false,
margin = 50,
value,
active = 1,
scale,
interval=1;
// Private variables
var axisScale,
dispatch = d3.dispatch("slide", "slideend"),
formatPercent = d3.format(".2%"),
tickFormat = d3.format(".0"),
handle1,
handle2 = null,
sliderLength;
function slider(selection) {
selection.each(function() {
// Create scale if not defined by user
if (!scale) {
scale = d3.scale.linear().domain([min, max]);
}
// Start value
value = value || scale.domain()[0];
// DIV container
var div = d3.select(this).classed("d3-slider d3-slider-" + orientation, true);
var drag = d3.behavior.drag();
drag.on('dragend', function () {
dispatch.slideend(d3.event, value);
})
// Slider handle
//if range slider, create two
var divRange;
if ( value.length == 2 ) {
handle1 = div.append("a")
.classed("d3-slider-handle", true)
.attr("xlink:href", "#")
.attr('id', "handle-one")
.on("click", stopPropagation)
.call(drag);
handle2 = div.append("a")
.classed("d3-slider-handle", true)
.attr('id', "handle-two")
.attr("xlink:href", "#")
.on("click", stopPropagation)
.call(drag);
} else {
handle1 = div.append("a")
.classed("d3-slider-handle", true)
.attr("xlink:href", "#")
.attr('id', "handle-one")
.on("click", stopPropagation)
.call(drag);
}
// Horizontal slider
if (orientation === "horizontal") {
div.on("click", onClickHorizontal);
if ( value.length == 2 ) {
divRange = d3.select(this).append('div').classed("d3-slider-range", true);
handle1.style("left", formatPercent(scale(value[ 0 ])));
divRange.style("left", formatPercent(scale(value[ 0 ])));
drag.on("drag", onDragHorizontal);
var width = 100 - parseFloat(formatPercent(scale(value[ 1 ])));
handle2.style("left", formatPercent(scale(value[ 1 ])));
divRange.style("right", width+"%");
drag.on("drag", onDragHorizontal);
} else {
handle1.style("left", formatPercent(scale(value)));
drag.on("drag", onDragHorizontal);
}
sliderLength = parseInt(div.style("width"), 10);
handle1.style('width', ((scale(interval+min)*sliderLength))+'px')
} else { // Vertical
div.on("click", onClickVertical);
drag.on("drag", onDragVertical);
if ( value.length == 2 ) {
divRange = d3.select(this).append('div').classed("d3-slider-range-vertical", true);
handle1.style("bottom", formatPercent(scale(value[ 0 ])));
divRange.style("bottom", formatPercent(scale(value[ 0 ])));
drag.on("drag", onDragVertical);
var top = 100 - parseFloat(formatPercent(scale(value[ 1 ])));
handle2.style("bottom", formatPercent(scale(value[ 1 ])));
divRange.style("top", top+"%");
drag.on("drag", onDragVertical);
} else {
handle1.style("bottom", formatPercent(scale(value)));
drag.on("drag", onDragVertical);
}
sliderLength = parseInt(div.style("height"), 10);
}
if (axis) {
createAxis(div);
}
function createAxis(dom) {
// Create axis if not defined by user
if (typeof axis === "boolean") {
axis = d3.svg.axis()
.ticks(Math.round(sliderLength / 100))
.tickFormat(tickFormat)
.orient((orientation === "horizontal") ? "bottom" : "right");
}
// Copy slider scale to move from percentages to pixels
axisScale = scale.copy().range([0, sliderLength]);
axis.scale(axisScale);
// Create SVG axis container
var svg = dom.append("svg")
.classed("d3-slider-axis d3-slider-axis-" + axis.orient(), true)
.on("click", stopPropagation);
var g = svg.append("g");
// Horizontal axis
if (orientation === "horizontal") {
svg.style("margin-left", -margin + "px");
svg.attr({
width: sliderLength + margin * 2,
height: margin
});
if (axis.orient() === "top") {
svg.style("top", -margin + "px");
g.attr("transform", "translate(" + margin + "," + margin + ")");
} else { // bottom
g.attr("transform", "translate(" + margin + ",0)");
}
} else { // Vertical
svg.style("top", -margin + "px");
svg.attr({
width: margin,
height: sliderLength + margin * 2
});
if (axis.orient() === "left") {
svg.style("left", -margin + "px");
g.attr("transform", "translate(" + margin + "," + margin + ")");
} else { // right
g.attr("transform", "translate(" + 0 + "," + margin + ")");
}
}
g.call(axis);
}
function onClickHorizontal() {
if (!value.length) {
var pos = Math.max(0, Math.min(sliderLength, d3.event.offsetX || d3.event.layerX));
moveHandle(stepValue(scale.invert(pos / sliderLength)));
}
}
function onClickVertical() {
if (!value.length) {
var pos = sliderLength - Math.max(0, Math.min(sliderLength, d3.event.offsetY || d3.event.layerY));
moveHandle(stepValue(scale.invert(pos / sliderLength)));
}
}
function onDragHorizontal() {
if ( d3.event.sourceEvent.target.id === "handle-one") {
active = 1;
} else if ( d3.event.sourceEvent.target.id == "handle-two" ) {
active = 2;
}
var pos = Math.max(0, Math.min(sliderLength, d3.event.x));
moveHandle(stepValue(scale.invert(pos / sliderLength)));
}
function onDragVertical() {
if ( d3.event.sourceEvent.target.id === "handle-one") {
active = 1;
} else if ( d3.event.sourceEvent.target.id == "handle-two" ) {
active = 2;
}
var pos = sliderLength - Math.max(0, Math.min(sliderLength, d3.event.y))
moveHandle(stepValue(scale.invert(pos / sliderLength)));
}
function stopPropagation() {
d3.event.stopPropagation();
}
});
}
// Move slider handle on click/drag
function moveHandle(newValue) {
if (slider.max()-slider.interval() < newValue) {
newValue = slider.max() - slider.interval();
}
var currentValue = value.length ? value[active - 1]: value;
if (currentValue !== newValue) {
var oldPos = formatPercent(scale(stepValue(currentValue))),
newPos = formatPercent(scale(stepValue(newValue))),
position = (orientation === "horizontal") ? "left" : "bottom";
if ( value.length === 2) {
value[ active - 1 ] = newValue;
if (d3.event) {
dispatch.slide(d3.event, value );
};
} else {
if (d3.event) {
dispatch.slide(d3.event.sourceEvent || d3.event, value = newValue);
};
}
if ( value[ 0 ] >= value[ 1 ] ) return;
if ( active === 1 ) {
if (value.length === 2) {
(position === "left") ? divRange.style("left", newPos) : divRange.style("bottom", newPos);
}
if (animate) {
handle1.transition()
.styleTween(position, function() { return d3.interpolate(oldPos, newPos); })
.duration((typeof animate === "number") ? animate : 250);
} else {
handle1.style(position, newPos);
}
} else {
var width = 100 - parseFloat(newPos);
var top = 100 - parseFloat(newPos);
(position === "left") ? divRange.style("right", width + "%") : divRange.style("top", top + "%");
if (animate) {
handle2.transition()
.styleTween(position, function() { return d3.interpolate(oldPos, newPos); })
.duration((typeof animate === "number") ? animate : 250);
} else {
handle2.style(position, newPos);
}
}
}
}
// Calculate nearest step value
function stepValue(val) {
if (val === scale.domain()[0] || val === scale.domain()[1]) {
return val;
}
var valModStep = (val - scale.domain()[0]) % step,
alignValue = val - valModStep;
if (Math.abs(valModStep) * 2 >= step) {
alignValue += (valModStep > 0) ? step : -step;
}
return alignValue;
}
// Getter/setter functions
slider.min = function(_) {
if (!arguments.length) return min;
min = _;
return slider;
};
slider.max = function(_) {
if (!arguments.length) return max;
max = _;
return slider;
};
slider.step = function(_) {
if (!arguments.length) return step;
step = _;
return slider;
};
slider.animate = function(_) {
if (!arguments.length) return animate;
animate = _;
return slider;
};
slider.orientation = function(_) {
if (!arguments.length) return orientation;
orientation = _;
return slider;
};
slider.axis = function(_) {
if (!arguments.length) return axis;
axis = _;
return slider;
};
slider.margin = function(_) {
if (!arguments.length) return margin;
margin = _;
return slider;
};
slider.value = function(_) {
if (!arguments.length) return value;
if (value !== undefined) {
moveHandle(stepValue(_));
};
value = _;
return slider;
};
slider.scale = function(_) {
if (!arguments.length) return scale;
scale = _;
return slider;
};
slider.interval = function(_) {
if (!arguments.length) return interval;
interval = _;
return slider;
};
d3.rebind(slider, dispatch, "on");
return slider;
}
}));
</script>
<!-- ndtv-d3 js code -->
<script>/**
ndtv-d3 is a d3-based HTML5 network animation player for the ndtv package (http://cran.r-project.org/web/packages/ndtv/index.html)
The ndtv-d3 library was created by Greg Michalec and Skye Bender-deMoll for the statnet project http://statnet.org funded by NICHD grant R01HD068395.
This software is distributed under the GPL-3 license (http://choosealicense.com/licenses/gpl-3.0/). It is free, open source, and has the attribution requirements (GPL Section 7) at http://statnet.org/attribution:
a. you agree to retain in ndtv-d3 and any modifications to ndtv-d3 the copyright, author attribution and URL information as provided at a http://statnetproject.org/attribution.
b. you agree that ndtv-d3 and any modifications to ndtv-d3 will, when used, display the attribution:
Based on 'statnet' project software (http://statnetproject.org). For license and citation information see http://statnetproject.org/attribution
Copyright 2014 Statnet Commons http://statnet.org
To cite this project, please use:
Greg Michalec, Skye Bender-deMoll, Martina Morris (2014) 'ndtv-d3: an HTML5 network animation player for the ndtv package' The statnet project. http://statnet.org
@module
*/
(function (root, factory) {
/** @class */
root.ndtv_d3 = factory();
}(this, function() {
"use strict";
/**
* Public options to control visualization functionality
* @constant {object}
* @global
* @default
*/
var default_options = {
animationDuration: 800, //Duration of each step animation during play or step actions, in milliseconds
enterExitAnimationFactor: 0, //Percentage (0-1) of total step animation time that enter/exit animations should take
labelOffset: { //pixel offset of labels
x: 12,
y: 0
},
baseFontSize: '14', //Font size, in pixels, for labels with cex value of 1
nodeSizeFactor: 0.01, //Percentage (0-1) of viewport size that a node of size 1 will be rendered at
dataChooser: false, //show a select box for choosing different graphs?
dataChooserDir: 'data/', //web path to dir containing data json files
playControls: true, //show the player controls
slider: true, //show the slider control
menu: true, //show a menu in upper-right
animateOnLoad: false, //play the graph animation on page load
margin: { //graph render area margins
x: 20,
y: 10
},
graphData: null, //graph data, either as JSON object or URL to json file
debugFrameInfo: false, //Show the slice info in corner
durationControl: true, //Show a control to change duration speed
};
/**
* Supported NDTV network properties and their default values
* @constant {object}
* @global
* @default
*/
var ndtvProperties = {
graph: {
xlab: null, // label caption below the render, on the xaxis
main: null, // main headline above the render
displaylabels: false , // should vertex labels be displayed
bg: '#fff', // background color
usearrows: true, // should arrows be drawn on edges?
xlim: null, // range of x values
ylim: null, // range of y values
edgeOffset: 0, // offset of edge length to vertex borders
tooltipOffset: 0, // offset of tooltips to vertex borders
},
node: {
coord: null, // coordinates for nodes
label: null, // labels for vertices
'label.col': '#000', // color of node label
'label.cex': 1, // label font size scale factor
'vertex.cex': 1, // vertex (node) expansion scale factor
'vertex.col': '#F00', // node fill color
'vertex.sides': 50, // number of sides for vertex polygon (shape)
'vertex.rot': 0, // rotation for vertex polygon
'vertex.tooltip': '', // vertex tooltip value
'vertex.border': '#000', // color of vertex border stroke
'vertex.lwd': 1, // width of vertex border stroke
'vertex.css.class': null, // css class name applied to node
'vertex.label.css.class': null, // css class name applied to node label
'vertex.css.style': null, // css inline-style applied to node (UNIMPLIMENTED)
'vertex.label.css.style': null, // css inline style applied to node label (UNIMPLEMENTED)
'image': null, // background image for vertex
},
edge: {
'edge.lwd': 1, // width of edge stroke
'edge.col': '#000', // edge stroke color
'edge.tooltip': null, // edge tooltip value
'edge.css.class': null, // css class name applied to edge
'edge.label.css.class': null, // css class name applied to edge label
'edge.css.style': null, // css inline-style applied to edge (UNIMPLIMENTED)
'edge.label.css.style': null, // css inline style applied to edge label (UNIMPLEMENTED)
}
}
/**
* Initialize a new ndtv-d3 instance
* @constructs ndtv_d3
* @param {object} - An object of default options overrides
* @param {string|HTMLElement} - A CSS selector string or DOM element reference specifying the target dom element the network should be initialized to
*/
var n3 = function(options, target) {
var n3 = this;
var globals = {
svg: null,
xScale: null,
yScale: null,
minTime: null,
interval: null,
maxTime: null,
animate: null,
baseNodeSize: null,
currTime: 0,
graph: null,
timeIndex:null,
domTarget:null,
slider:null,
nodeCoords: {},
options: {}
}
//initialize class globals
$.extend(true, n3, globals);
//replace defaults with user-specified options
$.extend(true, n3.options, default_options);
$.extend(true, n3.options, options);
if (!target) {
target = d3.select('body').append('div').style({width: '100%', height: '100%'}).node();
d3.selectAll('html, body').classed({'ndtv-fullscreen': true})
}
n3.domTarget = d3.select(target);
n3.domTarget.classed({'ndtv-d3-container': true});
n3.SVGSetup(n3.domTarget);
if (n3.options.playControls || n3.options.slider) {
n3.domTarget.append('div').attr('class', 'controls');
}
if (n3.options.dataChooser) { n3.createDataChooser(); }
if (n3.options.playControls) { n3.createPlayControls(); }
if (n3.options.slider) { n3.createSliderControl(); }
if (n3.options.menu) { n3.createMenu(); }
n3.tooltip = n3.domTarget.select('.graph').append('div').attr('class', 'tooltip');
n3.frameInfoDiv = n3.domTarget.select('.graph').append('div').attr('class', 'frameInfo')
if (n3.options.debugFrameInfo) { n3.frameInfoDiv.style('display', 'block'); }
if(n3.options.graphData) { n3.loadData(n3.options.graphData); }
}
/**
* Initialize the SVG element and related DOM elements and listeners
* @param {D3Selection} - DOM element to insert svg into
*/
n3.prototype.SVGSetup = function(domTarget) {
var n3 = this;
$(domTarget).resize(function(n) {
n3.resizeGraph(n);
});
$(window).resize(function(n) {
n3.resizeGraph(n);
});
domTarget
.append('div').attr('class', 'graph')
.append("svg:svg")
.append("defs")
var svg = domTarget.select('svg')
.append('g')
var dragEvent;
var rect = svg.append("rect")
.attr('class', 'background')
.style("fill", "none")
.style("pointer-events", "all")
.on('mousedown', function() {
dragEvent = d3.event;
})
.on('mouseup', function() {
if (Math.abs(dragEvent.pageX - d3.event.pageX) < 5 && Math.abs(dragEvent.pageY - d3.event.pageY) < 5) {
n3.hideTooltip();
n3.unSelectNetwork();
}
})
n3.container = svg.append("g")
.attr('class', 'container')
n3.container.append('g').attr('class', 'edges');
n3.container.append('g').attr('class', 'nodes');
n3.container.append('g').attr('class', 'labels');
n3.container.append('rect').attr('class', 'screen');
n3.container.append('g').attr('class', 'edges_selected');
n3.container.append('g').attr('class', 'nodes_selected');
n3.container.append('g').attr('class', 'labels_selected');
svg.append('g').attr('class', 'main').append('text');
svg.append('g').attr('class', 'xlab').append('text');
svg.on('mousedown', function() {
svg.classed({'dragging': true})
})
svg.on('mouseup', function() {
svg.classed({'dragging': false})
})
n3.zoom = d3.behavior.zoom()
.scaleExtent([.5, 10])
.on("zoom", function zoomed() {
n3.container.attr("transform", "translate(" + d3.event.translate + ")scale(" + d3.event.scale + ")");
n3.ctm = n3.container.node().getScreenCTM();
n3.moveTooltip();
})
svg.call(n3.zoom)
}
/** sets positioning on svg elements based on current DOM container size and sets data scaling factors accordingly */
n3.prototype.updateDimensions = function() {
var n3 = this;
var div_width = n3.domTarget.node().offsetWidth
var div_height = n3.domTarget.node().offsetHeight - $(n3.domTarget.select('.controls').node()).outerHeight(true);
var xlab = n3.timeIndex[n3.currTime].renderData.graph.xlab;
var main = n3.timeIndex[n3.currTime].renderData.graph.main;
var xlabSize = parseFloat(window.getComputedStyle(n3.domTarget.select('.xlab').node(), null).getPropertyValue('font-size'));
var mainSize = parseFloat(window.getComputedStyle(n3.domTarget.select('.main').node(), null).getPropertyValue('font-size'));
var mainMargin = 0;
var xlabMargin = 0;
if (xlab) {
xlabMargin = xlabSize*(xlab.length+1)*1.2;
}
if (main) {
mainMargin = mainSize*(main.length+1)*1.2;
}
var margin = {
x: n3.options.margin.x,
y: n3.options.margin.y
}
if (div_width > div_height) {
margin.x = (div_width - div_height)/2
} else {
margin.y = (div_height - div_width)/2
}
var width = div_width - (margin.x*2);
var height = div_height - (margin.y*2);
n3.domTarget.selectAll('.graph>svg, .background, .screen')
.attr({
width: width + margin.x * 2,
height: height + margin.y * 2
})
//reset height including main & xlab for graph container translation
height = height - mainMargin - xlabMargin;
n3.container.attr("transform", "translate(" + margin.x + "," + (margin.y+mainMargin) + ")");
var center = margin.x + width/2;
n3.domTarget.select('.xlab').attr('transform', "translate("+center+","+(div_height-margin.y)+")")
n3.domTarget.select('.main').attr('transform', "translate("+center+","+(margin.y+mainSize)+")")
var pixelSpace = height > width ? width : height;
n3.baseNodeSize = pixelSpace * n3.options.nodeSizeFactor;
//set the X and Y scales
n3.xScale = d3.scale.linear()
.domain([n3.timeIndex[0].renderData.graph.xlim[0],n3.timeIndex[0].renderData.graph.xlim[1]])
.range([0, pixelSpace]);
n3.yScale = d3.scale.linear()
.domain([n3.timeIndex[0].renderData.graph.ylim[0],n3.timeIndex[0].renderData.graph.ylim[1]])
.range([pixelSpace, 0]);
//reset zoom translate based on margins
n3.zoom.translate([margin.x, margin.y+mainMargin])
//Cache height and offset to use for tooltip movement
n3.height = n3.domTarget.select('.graph').node().offsetHeight
n3.offset = $(n3.domTarget.select('.graph').node()).offset();
n3.ctm = n3.container.node().getScreenCTM();
}
/** creates the optional dataChooser element to be used for slecting among multiple JSON files for debugging */
n3.prototype.createDataChooser = function() {
var n3 = this;
var div = n3.domTarget.append('div').attr('class', 'data_chooser_container')
div.append('select').attr('class', 'data_chooser')
div.append('a').attr({'class': 'video_link', 'target': '_blank'}).html('Video');