source: trunk/svg-pan-zoom-klask.js @ 413

// svg-pan-zoom v3.5.2
// https://github.com/ariutta/svg-pan-zoom
// wget http://ariutta.github.io/svg-pan-zoom/dist/svg-pan-zoom.js
(function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
var svgPanZoom = require('./svg-pan-zoom.js');

// UMD module definition
(function(window, document){
  // AMD
  if (typeof define === 'function' && define.amd) {
    define('svg-pan-zoom', function () {
      return svgPanZoom;
    });
  // CMD
  } else if (typeof module !== 'undefined' && module.exports) {
    module.exports = svgPanZoom;

    // Browser
    // Keep exporting globally as module.exports is available because of browserify
    window.svgPanZoom = svgPanZoom;
  }
})(window, document)

},{"./svg-pan-zoom.js":4}],2:[function(require,module,exports){
var SvgUtils = require('./svg-utilities');

module.exports = {
  enable: function(instance) {
    // Select (and create if necessary) defs
    var defs = instance.svg.querySelector('defs')
    if (!defs) {
      defs = document.createElementNS(SvgUtils.svgNS, 'defs')
      instance.svg.appendChild(defs)
    }

    // Check for style element, and create it if it doesn't exist
    var styleEl = defs.querySelector('style#svg-pan-zoom-controls-styles');
    if (!styleEl) {
      var style = document.createElementNS(SvgUtils.svgNS, 'style')
      style.setAttribute('id', 'svg-pan-zoom-controls-styles')
      style.setAttribute('type', 'text/css')
      style.textContent = '.svg-pan-zoom-control { cursor: pointer; fill: black; fill-opacity: 0.333; } .svg-pan-zoom-control:hover { fill-opacity: 0.8; } .svg-pan-zoom-control-background { fill: white; fill-opacity: 0.5; } .svg-pan-zoom-control-background { fill-opacity: 0.8; }'
      defs.appendChild(style)
    }

    // Zoom Group
    var zoomGroup = document.createElementNS(SvgUtils.svgNS, 'g');
    zoomGroup.setAttribute('id', 'svg-pan-zoom-controls');
    zoomGroup.setAttribute('transform', 'translate(' + ( instance.width - 70 ) + ' ' + ( instance.height - 76 ) + ') scale(0.75)');
    zoomGroup.setAttribute('class', 'svg-pan-zoom-control');

    // Control elements
    zoomGroup.appendChild(this._createZoomIn(instance))
    zoomGroup.appendChild(this._createZoomReset(instance))
    zoomGroup.appendChild(this._createZoomOut(instance))

    // Finally append created element
    instance.svg.appendChild(zoomGroup)

    // Cache control instance
    instance.controlIcons = zoomGroup
  }

, _createZoomIn: function(instance) {
    var zoomIn = document.createElementNS(SvgUtils.svgNS, 'g');
    zoomIn.setAttribute('id', 'svg-pan-zoom-zoom-in');
    zoomIn.setAttribute('transform', 'translate(30.5 5) scale(0.015)');
    zoomIn.setAttribute('class', 'svg-pan-zoom-control');
    zoomIn.addEventListener('click', function() {instance.getPublicInstance().zoomIn()}, false)
    zoomIn.addEventListener('touchstart', function() {instance.getPublicInstance().zoomIn()}, false)

    var zoomInBackground = document.createElementNS(SvgUtils.svgNS, 'rect'); // TODO change these background space fillers to rounded rectangles so they look prettier
    zoomInBackground.setAttribute('x', '0');
    zoomInBackground.setAttribute('y', '0');
    zoomInBackground.setAttribute('width', '1500'); // larger than expected because the whole group is transformed to scale down
    zoomInBackground.setAttribute('height', '1400');
    zoomInBackground.setAttribute('class', 'svg-pan-zoom-control-background');
    zoomIn.appendChild(zoomInBackground);

    var zoomInShape = document.createElementNS(SvgUtils.svgNS, 'path');
    zoomInShape.setAttribute('d', 'M1280 576v128q0 26 -19 45t-45 19h-320v320q0 26 -19 45t-45 19h-128q-26 0 -45 -19t-19 -45v-320h-320q-26 0 -45 -19t-19 -45v-128q0 -26 19 -45t45 -19h320v-320q0 -26 19 -45t45 -19h128q26 0 45 19t19 45v320h320q26 0 45 19t19 45zM1536 1120v-960 q0 -119 -84.5 -203.5t-203.5 -84.5h-960q-119 0 -203.5 84.5t-84.5 203.5v960q0 119 84.5 203.5t203.5 84.5h960q119 0 203.5 -84.5t84.5 -203.5z');
    zoomInShape.setAttribute('class', 'svg-pan-zoom-control-element');
    zoomIn.appendChild(zoomInShape);

    return zoomIn
  }

, _createZoomReset: function(instance){
    // reset
    var resetPanZoomControl = document.createElementNS(SvgUtils.svgNS, 'g');
    resetPanZoomControl.setAttribute('id', 'svg-pan-zoom-reset-pan-zoom');
    resetPanZoomControl.setAttribute('transform', 'translate(5 35) scale(0.4)');
    resetPanZoomControl.setAttribute('class', 'svg-pan-zoom-control');
    resetPanZoomControl.addEventListener('click', function() {instance.getPublicInstance().reset()}, false);
    resetPanZoomControl.addEventListener('touchstart', function() {instance.getPublicInstance().reset()}, false);

    var resetPanZoomControlBackground = document.createElementNS(SvgUtils.svgNS, 'rect'); // TODO change these background space fillers to rounded rectangles so they look prettier
    resetPanZoomControlBackground.setAttribute('x', '2');
    resetPanZoomControlBackground.setAttribute('y', '2');
    resetPanZoomControlBackground.setAttribute('width', '182'); // larger than expected because the whole group is transformed to scale down
    resetPanZoomControlBackground.setAttribute('height', '58');
    resetPanZoomControlBackground.setAttribute('class', 'svg-pan-zoom-control-background');
    resetPanZoomControl.appendChild(resetPanZoomControlBackground);

    var resetPanZoomControlShape1 = document.createElementNS(SvgUtils.svgNS, 'path');
    resetPanZoomControlShape1.setAttribute('d', 'M33.051,20.632c-0.742-0.406-1.854-0.609-3.338-0.609h-7.969v9.281h7.769c1.543,0,2.701-0.188,3.473-0.562c1.365-0.656,2.048-1.953,2.048-3.891C35.032,22.757,34.372,21.351,33.051,20.632z');
    resetPanZoomControlShape1.setAttribute('class', 'svg-pan-zoom-control-element');
    resetPanZoomControl.appendChild(resetPanZoomControlShape1);

    var resetPanZoomControlShape2 = document.createElementNS(SvgUtils.svgNS, 'path');
    resetPanZoomControlShape2.setAttribute('d', 'M170.231,0.5H15.847C7.102,0.5,0.5,5.708,0.5,11.84v38.861C0.5,56.833,7.102,61.5,15.847,61.5h154.384c8.745,0,15.269-4.667,15.269-10.798V11.84C185.5,5.708,178.976,0.5,170.231,0.5z M42.837,48.569h-7.969c-0.219-0.766-0.375-1.383-0.469-1.852c-0.188-0.969-0.289-1.961-0.305-2.977l-0.047-3.211c-0.03-2.203-0.41-3.672-1.142-4.406c-0.732-0.734-2.103-1.102-4.113-1.102h-7.05v13.547h-7.055V14.022h16.524c2.361,0.047,4.178,0.344,5.45,0.891c1.272,0.547,2.351,1.352,3.234,2.414c0.731,0.875,1.31,1.844,1.737,2.906s0.64,2.273,0.64,3.633c0,1.641-0.414,3.254-1.242,4.84s-2.195,2.707-4.102,3.363c1.594,0.641,2.723,1.551,3.387,2.73s0.996,2.98,0.996,5.402v2.32c0,1.578,0.063,2.648,0.19,3.211c0.19,0.891,0.635,1.547,1.333,1.969V48.569z M75.579,48.569h-26.18V14.022h25.336v6.117H56.454v7.336h16.781v6H56.454v8.883h19.125V48.569z M104.497,46.331c-2.44,2.086-5.887,3.129-10.34,3.129c-4.548,0-8.125-1.027-10.731-3.082s-3.909-4.879-3.909-8.473h6.891c0.224,1.578,0.662,2.758,1.316,3.539c1.196,1.422,3.246,2.133,6.15,2.133c1.739,0,3.151-0.188,4.236-0.562c2.058-0.719,3.087-2.055,3.087-4.008c0-1.141-0.504-2.023-1.512-2.648c-1.008-0.609-2.607-1.148-4.796-1.617l-3.74-0.82c-3.676-0.812-6.201-1.695-7.576-2.648c-2.328-1.594-3.492-4.086-3.492-7.477c0-3.094,1.139-5.664,3.417-7.711s5.623-3.07,10.036-3.07c3.685,0,6.829,0.965,9.431,2.895c2.602,1.93,3.966,4.73,4.093,8.402h-6.938c-0.128-2.078-1.057-3.555-2.787-4.43c-1.154-0.578-2.587-0.867-4.301-0.867c-1.907,0-3.428,0.375-4.565,1.125c-1.138,0.75-1.706,1.797-1.706,3.141c0,1.234,0.561,2.156,1.682,2.766c0.721,0.406,2.25,0.883,4.589,1.43l6.063,1.43c2.657,0.625,4.648,1.461,5.975,2.508c2.059,1.625,3.089,3.977,3.089,7.055C108.157,41.624,106.937,44.245,104.497,46.331z M139.61,48.569h-26.18V14.022h25.336v6.117h-18.281v7.336h16.781v6h-16.781v8.883h19.125V48.569z M170.337,20.14h-10.336v28.43h-7.266V20.14h-10.383v-6.117h27.984V20.14z');
    resetPanZoomControlShape2.setAttribute('class', 'svg-pan-zoom-control-element');
    resetPanZoomControl.appendChild(resetPanZoomControlShape2);

    return resetPanZoomControl
  }

, _createZoomOut: function(instance){
    // zoom out
    var zoomOut = document.createElementNS(SvgUtils.svgNS, 'g');
    zoomOut.setAttribute('id', 'svg-pan-zoom-zoom-out');
    zoomOut.setAttribute('transform', 'translate(30.5 70) scale(0.015)');
    zoomOut.setAttribute('class', 'svg-pan-zoom-control');
    zoomOut.addEventListener('click', function() {instance.getPublicInstance().zoomOut()}, false);
    zoomOut.addEventListener('touchstart', function() {instance.getPublicInstance().zoomOut()}, false);

    var zoomOutBackground = document.createElementNS(SvgUtils.svgNS, 'rect'); // TODO change these background space fillers to rounded rectangles so they look prettier
    zoomOutBackground.setAttribute('x', '0');
    zoomOutBackground.setAttribute('y', '0');
    zoomOutBackground.setAttribute('width', '1500'); // larger than expected because the whole group is transformed to scale down
    zoomOutBackground.setAttribute('height', '1400');
    zoomOutBackground.setAttribute('class', 'svg-pan-zoom-control-background');
    zoomOut.appendChild(zoomOutBackground);

    var zoomOutShape = document.createElementNS(SvgUtils.svgNS, 'path');
    zoomOutShape.setAttribute('d', 'M1280 576v128q0 26 -19 45t-45 19h-896q-26 0 -45 -19t-19 -45v-128q0 -26 19 -45t45 -19h896q26 0 45 19t19 45zM1536 1120v-960q0 -119 -84.5 -203.5t-203.5 -84.5h-960q-119 0 -203.5 84.5t-84.5 203.5v960q0 119 84.5 203.5t203.5 84.5h960q119 0 203.5 -84.5 t84.5 -203.5z');
    zoomOutShape.setAttribute('class', 'svg-pan-zoom-control-element');
    zoomOut.appendChild(zoomOutShape);

    return zoomOut
  }

, disable: function(instance) {
    if (instance.controlIcons) {
      instance.controlIcons.parentNode.removeChild(instance.controlIcons)
      instance.controlIcons = null
    }
  }
}

},{"./svg-utilities":5}],3:[function(require,module,exports){
var SvgUtils = require('./svg-utilities')
  , Utils = require('./utilities')
  ;

var ShadowViewport = function(viewport, options){
  this.init(viewport, options)
}

/**
 * Initialization
 *
 * @param  {SVGElement} viewport
 * @param  {Object} options
 */
ShadowViewport.prototype.init = function(viewport, options) {
  // DOM Elements
  this.viewport = viewport
  this.options = options

  // State cache
  this.originalState = {zoom: 1, x: 0, y: 0}
  this.activeState = {zoom: 1, x: 0, y: 0}

  this.updateCTMCached = Utils.proxy(this.updateCTM, this)

  // Create a custom requestAnimationFrame taking in account refreshRate
  this.requestAnimationFrame = Utils.createRequestAnimationFrame(this.options.refreshRate)

  // ViewBox
  this.viewBox = {x: 0, y: 0, width: 0, height: 0}
  this.cacheViewBox()

  // Process CTM
  var newCTM = this.processCTM()

  // Update viewport CTM and cache zoom and pan
  this.setCTM(newCTM)

  // Update CTM in this frame
  this.updateCTM()
}

/**
 * Cache initial viewBox value
 * If no viewBox is defined, then use viewport size/position instead for viewBox values
 */
ShadowViewport.prototype.cacheViewBox = function() {
  var svgViewBox = this.options.svg.getAttribute('viewBox')

  if (svgViewBox) {
    var viewBoxValues = svgViewBox.split(/[\s\,]/).filter(function(v){return v}).map(parseFloat)

    // Cache viewbox x and y offset
    this.viewBox.x = viewBoxValues[0]
    this.viewBox.y = viewBoxValues[1]
    this.viewBox.width = viewBoxValues[2]
    this.viewBox.height = viewBoxValues[3]

    var zoom = Math.min(this.options.width / this.viewBox.width, this.options.height / this.viewBox.height)

    // Update active state
    this.activeState.zoom = zoom
    this.activeState.x = (this.options.width - this.viewBox.width * zoom) / 2
    this.activeState.y = (this.options.height - this.viewBox.height * zoom) / 2

    // Force updating CTM
    this.updateCTMOnNextFrame()

    this.options.svg.removeAttribute('viewBox')
  } else {
    this.simpleViewBoxCache()
  }
}

/**
 * Recalculate viewport sizes and update viewBox cache
 */
ShadowViewport.prototype.simpleViewBoxCache = function() {
  var bBox = this.viewport.getBBox()

  this.viewBox.x = bBox.x
  this.viewBox.y = bBox.y
  this.viewBox.width = bBox.width
  this.viewBox.height = bBox.height
}

/**
 * Returns a viewbox object. Safe to alter
 *
 * @return {Object} viewbox object
 */
ShadowViewport.prototype.getViewBox = function() {
  return Utils.extend({}, this.viewBox)
}

/**
 * Get initial zoom and pan values. Save them into originalState
 * Parses viewBox attribute to alter initial sizes
 *
 * @return {CTM} CTM object based on options
 */
ShadowViewport.prototype.processCTM = function() {
  var newCTM = this.getCTM()

  if (this.options.fit || this.options.contain) {
    var newScale;
    if (this.options.fit) {
      newScale = Math.min(this.options.width/this.viewBox.width, this.options.height/this.viewBox.height);
    } else {
      newScale = Math.max(this.options.width/this.viewBox.width, this.options.height/this.viewBox.height);
    }

    newCTM.a = newScale; //x-scale
    newCTM.d = newScale; //y-scale
    newCTM.e = -this.viewBox.x * newScale; //x-transform
    newCTM.f = -this.viewBox.y * newScale; //y-transform
  }

  if (this.options.center) {
    var offsetX = (this.options.width - (this.viewBox.width + this.viewBox.x * 2) * newCTM.a) * 0.5
      , offsetY = (this.options.height - (this.viewBox.height + this.viewBox.y * 2) * newCTM.a) * 0.5

    newCTM.e = offsetX
    newCTM.f = offsetY
  }

  // Cache initial values. Based on activeState and fix+center opitons
  this.originalState.zoom = newCTM.a
  this.originalState.x = newCTM.e
  this.originalState.y = newCTM.f

  return newCTM
}

/**
 * Return originalState object. Safe to alter
 *
 * @return {Object}
 */
ShadowViewport.prototype.getOriginalState = function() {
  return Utils.extend({}, this.originalState)
}

/**
 * Return actualState object. Safe to alter
 *
 * @return {Object}
 */
ShadowViewport.prototype.getState = function() {
  return Utils.extend({}, this.activeState)
}

/**
 * Get zoom scale
 *
 * @return {Float} zoom scale
 */
ShadowViewport.prototype.getZoom = function() {
  return this.activeState.zoom
}

/**
 * Get zoom scale for pubilc usage
 *
 * @return {Float} zoom scale
 */
ShadowViewport.prototype.getRelativeZoom = function() {
  return this.activeState.zoom / this.originalState.zoom
}

/**
 * Compute zoom scale for pubilc usage
 *
 * @return {Float} zoom scale
 */
ShadowViewport.prototype.computeRelativeZoom = function(scale) {
  return scale / this.originalState.zoom
}

/**
 * Get pan
 *
 * @return {Object}
 */
ShadowViewport.prototype.getPan = function() {
  return {x: this.activeState.x, y: this.activeState.y}
}

/**
 * Return cached viewport CTM value that can be safely modified
 *
 * @return {SVGMatrix}
 */
ShadowViewport.prototype.getCTM = function() {
  var safeCTM = this.options.svg.createSVGMatrix()

  // Copy values manually as in FF they are not itterable
  safeCTM.a = this.activeState.zoom
  safeCTM.b = 0
  safeCTM.c = 0
  safeCTM.d = this.activeState.zoom
  safeCTM.e = this.activeState.x
  safeCTM.f = this.activeState.y

  return safeCTM
}

/**
 * Set a new CTM
 *
 * @param {SVGMatrix} newCTM
 */
ShadowViewport.prototype.setCTM = function(newCTM) {
  var willZoom = this.isZoomDifferent(newCTM)
    , willPan = this.isPanDifferent(newCTM)

  if (willZoom || willPan) {
    // Before zoom
    if (willZoom) {
      // If returns false then cancel zooming
      if (this.options.beforeZoom(this.getRelativeZoom(), this.computeRelativeZoom(newCTM.a)) === false) {
        newCTM.a = newCTM.d = this.activeState.zoom
        willZoom = false
      } else {
        this.updateCache(newCTM);
        this.options.onZoom(this.getRelativeZoom())
      }
    }

    // Before pan
    if (willPan) {
      var preventPan = this.options.beforePan(this.getPan(), {x: newCTM.e, y: newCTM.f})
          // If prevent pan is an object
        , preventPanX = false
        , preventPanY = false

      // If prevent pan is Boolean false
      if (preventPan === false) {
        // Set x and y same as before
        newCTM.e = this.getPan().x
        newCTM.f = this.getPan().y

        preventPanX = preventPanY = true
      } else if (Utils.isObject(preventPan)) {
        // Check for X axes attribute
        if (preventPan.x === false) {
          // Prevent panning on x axes
          newCTM.e = this.getPan().x
          preventPanX = true
        } else if (Utils.isNumber(preventPan.x)) {
          // Set a custom pan value
          newCTM.e = preventPan.x
        }

        // Check for Y axes attribute
        if (preventPan.y === false) {
          // Prevent panning on x axes
          newCTM.f = this.getPan().y
          preventPanY = true
        } else if (Utils.isNumber(preventPan.y)) {
          // Set a custom pan value
          newCTM.f = preventPan.y
        }
      }

      // Update willPan flag
      // Check if newCTM is still different
      if ((preventPanX && preventPanY) || !this.isPanDifferent(newCTM)) {
        willPan = false
      } else {
        this.updateCache(newCTM);
        this.options.onPan(this.getPan());
      }
    }

    // Check again if should zoom or pan
    if (willZoom || willPan) {
      this.updateCTMOnNextFrame()
    }
  }
}

ShadowViewport.prototype.isZoomDifferent = function(newCTM) {
  return this.activeState.zoom !== newCTM.a
}

ShadowViewport.prototype.isPanDifferent = function(newCTM) {
  return this.activeState.x !== newCTM.e || this.activeState.y !== newCTM.f
}


/**
 * Update cached CTM and active state
 *
 * @param {SVGMatrix} newCTM
 */
ShadowViewport.prototype.updateCache = function(newCTM) {
  this.activeState.zoom = newCTM.a
  this.activeState.x = newCTM.e
  this.activeState.y = newCTM.f
}

ShadowViewport.prototype.pendingUpdate = false

/**
 * Place a request to update CTM on next Frame
 */
ShadowViewport.prototype.updateCTMOnNextFrame = function() {
  if (!this.pendingUpdate) {
    // Lock
    this.pendingUpdate = true

    // Throttle next update
    this.requestAnimationFrame.call(window, this.updateCTMCached)
  }
}

/**
 * Update viewport CTM with cached CTM
 */
ShadowViewport.prototype.updateCTM = function() {
  var ctm = this.getCTM()

  // Updates SVG element
  SvgUtils.setCTM(this.viewport, ctm, this.defs)

  // Free the lock
  this.pendingUpdate = false

  // Notify about the update
  if(this.options.onUpdatedCTM) {
    this.options.onUpdatedCTM(ctm)
  }
}

module.exports = function(viewport, options){
  return new ShadowViewport(viewport, options)
}

},{"./svg-utilities":5,"./utilities":7}],4:[function(require,module,exports){
var Wheel = require('./uniwheel')
, ControlIcons = require('./control-icons')
, Utils = require('./utilities')
, SvgUtils = require('./svg-utilities')
, ShadowViewport = require('./shadow-viewport')

var SvgPanZoom = function(svg, options) {
  this.init(svg, options)
}

var optionsDefaults = {
  viewportSelector: '.svg-pan-zoom_viewport' // Viewport selector. Can be querySelector string or SVGElement
, panEnabled: true // enable or disable panning (default enabled)
, controlIconsEnabled: false // insert icons to give user an option in addition to mouse events to control pan/zoom (default disabled)
, zoomEnabled: true // enable or disable zooming (default enabled)
, dblClickZoomEnabled: true // enable or disable zooming by double clicking (default enabled)
, mouseWheelZoomEnabled: true // enable or disable zooming by mouse wheel (default enabled)
, preventMouseEventsDefault: true // enable or disable preventDefault for mouse events
, zoomScaleSensitivity: 0.1 // Zoom sensitivity
, minZoom: 0.5 // Minimum Zoom level
, maxZoom: 10 // Maximum Zoom level
, fit: true // enable or disable viewport fit in SVG (default true)
, contain: false // enable or disable viewport contain the svg (default false)
, center: true // enable or disable viewport centering in SVG (default true)
, refreshRate: 'auto' // Maximum number of frames per second (altering SVG's viewport)
, beforeZoom: null
, onZoom: null
, beforePan: null
, onPan: null
, customEventsHandler: null
, eventsListenerElement: null
, onUpdatedCTM: null
}

SvgPanZoom.prototype.init = function(svg, options) {
  var that = this

  this.svg = svg
  this.defs = svg.querySelector('defs')

  // Add default attributes to SVG
  SvgUtils.setupSvgAttributes(this.svg)

  // Set options
  this.options = Utils.extend(Utils.extend({}, optionsDefaults), options)

  // Set default state
  this.state = 'none'

  // Get dimensions
  var boundingClientRectNormalized = SvgUtils.getBoundingClientRectNormalized(svg)
  this.width = boundingClientRectNormalized.width
  this.height = boundingClientRectNormalized.height

  // Init shadow viewport
  this.viewport = ShadowViewport(SvgUtils.getOrCreateViewport(this.svg, this.options.viewportSelector), {
    svg: this.svg
  , width: this.width
  , height: this.height
  , fit: this.options.fit
  , contain: this.options.contain
  , center: this.options.center
  , refreshRate: this.options.refreshRate
  // Put callbacks into functions as they can change through time
  , beforeZoom: function(oldScale, newScale) {
      if (that.viewport && that.options.beforeZoom) {return that.options.beforeZoom(oldScale, newScale)}
    }
  , onZoom: function(scale) {
      if (that.viewport && that.options.onZoom) {return that.options.onZoom(scale)}
    }
  , beforePan: function(oldPoint, newPoint) {
      if (that.viewport && that.options.beforePan) {return that.options.beforePan(oldPoint, newPoint)}
    }
  , onPan: function(point) {
      if (that.viewport && that.options.onPan) {return that.options.onPan(point)}
    }
  , onUpdatedCTM: function(ctm) {
      if (that.viewport && that.options.onUpdatedCTM) {return that.options.onUpdatedCTM(ctm)}
    }
  })

  // Wrap callbacks into public API context
  var publicInstance = this.getPublicInstance()
  publicInstance.setBeforeZoom(this.options.beforeZoom)
  publicInstance.setOnZoom(this.options.onZoom)
  publicInstance.setBeforePan(this.options.beforePan)
  publicInstance.setOnPan(this.options.onPan)
  publicInstance.setOnUpdatedCTM(this.options.onUpdatedCTM)

  if (this.options.controlIconsEnabled) {
    ControlIcons.enable(this)
  }

  // Init events handlers
  this.lastMouseWheelEventTime = Date.now()
  this.setupHandlers()
}

/**
 * Register event handlers
 */
SvgPanZoom.prototype.setupHandlers = function() {
  var that = this
    , prevEvt = null // use for touchstart event to detect double tap
    ;

  this.eventListeners = {
    // Mouse down group
    mousedown: function(evt) {
      var result = that.handleMouseDown(evt, prevEvt);
      prevEvt = evt
      return result;
    }
  , touchstart: function(evt) {
      var result = that.handleMouseDown(evt, prevEvt);
      prevEvt = evt
      return result;
    }

    // Mouse up group
  , mouseup: function(evt) {
      return that.handleMouseUp(evt);
    }
  , touchend: function(evt) {
      return that.handleMouseUp(evt);
    }

    // Mouse move group
  , mousemove: function(evt) {
      return that.handleMouseMove(evt);
    }
  , touchmove: function(evt) {
      return that.handleMouseMove(evt);
    }

    // Mouse leave group
  , mouseleave: function(evt) {
      return that.handleMouseUp(evt);
    }
  , touchleave: function(evt) {
      return that.handleMouseUp(evt);
    }
  , touchcancel: function(evt) {
      return that.handleMouseUp(evt);
    }
  }

  // Init custom events handler if available
  if (this.options.customEventsHandler != null) { // jshint ignore:line
    this.options.customEventsHandler.init({
      svgElement: this.svg
    , eventsListenerElement: this.options.eventsListenerElement
    , instance: this.getPublicInstance()
    })

    // Custom event handler may halt builtin listeners
    var haltEventListeners = this.options.customEventsHandler.haltEventListeners
    if (haltEventListeners && haltEventListeners.length) {
      for (var i = haltEventListeners.length - 1; i >= 0; i--) {
        if (this.eventListeners.hasOwnProperty(haltEventListeners[i])) {
          delete this.eventListeners[haltEventListeners[i]]
        }
      }
    }
  }

  // Bind eventListeners
  for (var event in this.eventListeners) {
    // Attach event to eventsListenerElement or SVG if not available
    (this.options.eventsListenerElement || this.svg)
      .addEventListener(event, this.eventListeners[event], false)
  }

  // Zoom using mouse wheel
  if (this.options.mouseWheelZoomEnabled) {
    this.options.mouseWheelZoomEnabled = false // set to false as enable will set it back to true
    this.enableMouseWheelZoom()
  }
}

/**
 * Enable ability to zoom using mouse wheel
 */
SvgPanZoom.prototype.enableMouseWheelZoom = function() {
  if (!this.options.mouseWheelZoomEnabled) {
    var that = this

    // Mouse wheel listener
    this.wheelListener = function(evt) {
      return that.handleMouseWheel(evt);
    }

    // Bind wheelListener
    Wheel.on(this.options.eventsListenerElement || this.svg, this.wheelListener, false)

    this.options.mouseWheelZoomEnabled = true
  }
}

/**
 * Disable ability to zoom using mouse wheel
 */
SvgPanZoom.prototype.disableMouseWheelZoom = function() {
  if (this.options.mouseWheelZoomEnabled) {
    Wheel.off(this.options.eventsListenerElement || this.svg, this.wheelListener, false)
    this.options.mouseWheelZoomEnabled = false
  }
}

/**
 * Handle mouse wheel event
 *
 * @param  {Event} evt
 */
SvgPanZoom.prototype.handleMouseWheel = function(evt) {
  if (!this.options.zoomEnabled || this.state !== 'none') {
    return;
  }

  if (this.options.preventMouseEventsDefault){
    if (evt.preventDefault) {
      evt.preventDefault();
    } else {
      evt.returnValue = false;
    }
  }

  // Default delta in case that deltaY is not available
  var delta = evt.deltaY || 1
    , timeDelta = Date.now() - this.lastMouseWheelEventTime
    , divider = 3 + Math.max(0, 30 - timeDelta)

  // Update cache
  this.lastMouseWheelEventTime = Date.now()

  // Make empirical adjustments for browsers that give deltaY in pixels (deltaMode=0)
  if ('deltaMode' in evt && evt.deltaMode === 0 && evt.wheelDelta) {
    delta = evt.deltaY === 0 ? 0 :  Math.abs(evt.wheelDelta) / evt.deltaY
  }

  delta = -0.3 < delta && delta < 0.3 ? delta : (delta > 0 ? 1 : -1) * Math.log(Math.abs(delta) + 10) / divider

  var inversedScreenCTM = this.svg.getScreenCTM().inverse()
    , relativeMousePoint = SvgUtils.getEventPoint(evt, this.svg).matrixTransform(inversedScreenCTM)
    , zoom = Math.pow(1 + this.options.zoomScaleSensitivity, (-1) * delta); // multiplying by neg. 1 so as to make zoom in/out behavior match Google maps behavior

  this.zoomAtPoint(zoom, relativeMousePoint)
}

/**
 * Zoom in at a SVG point
 *
 * @param  {SVGPoint} point
 * @param  {Float} zoomScale    Number representing how much to zoom
 * @param  {Boolean} zoomAbsolute Default false. If true, zoomScale is treated as an absolute value.
 *                                Otherwise, zoomScale is treated as a multiplied (e.g. 1.10 would zoom in 10%)
 */
SvgPanZoom.prototype.zoomAtPoint = function(zoomScale, point, zoomAbsolute) {
  var originalState = this.viewport.getOriginalState()

  if (!zoomAbsolute) {
    // Fit zoomScale in set bounds
    if (this.getZoom() * zoomScale < this.options.minZoom * originalState.zoom) {
      zoomScale = (this.options.minZoom * originalState.zoom) / this.getZoom()
    } else if (this.getZoom() * zoomScale > this.options.maxZoom * originalState.zoom) {
      zoomScale = (this.options.maxZoom * originalState.zoom) / this.getZoom()
    }
  } else {
    // Fit zoomScale in set bounds
    zoomScale = Math.max(this.options.minZoom * originalState.zoom, Math.min(this.options.maxZoom * originalState.zoom, zoomScale))
    // Find relative scale to achieve desired scale
    zoomScale = zoomScale/this.getZoom()
  }

  var oldCTM = this.viewport.getCTM()
    , relativePoint = point.matrixTransform(oldCTM.inverse())
    , modifier = this.svg.createSVGMatrix().translate(relativePoint.x, relativePoint.y).scale(zoomScale).translate(-relativePoint.x, -relativePoint.y)
    , newCTM = oldCTM.multiply(modifier)

  if (newCTM.a !== oldCTM.a) {
    this.viewport.setCTM(newCTM)
  }
}

/**
 * Zoom at center point
 *
 * @param  {Float} scale
 * @param  {Boolean} absolute Marks zoom scale as relative or absolute
 */
SvgPanZoom.prototype.zoom = function(scale, absolute) {
  this.zoomAtPoint(scale, SvgUtils.getSvgCenterPoint(this.svg, this.width, this.height), absolute)
}

/**
 * Zoom used by public instance
 *
 * @param  {Float} scale
 * @param  {Boolean} absolute Marks zoom scale as relative or absolute
 */
SvgPanZoom.prototype.publicZoom = function(scale, absolute) {
  if (absolute) {
    scale = this.computeFromRelativeZoom(scale)
  }

  this.zoom(scale, absolute)
}

/**
 * Zoom at point used by public instance
 *
 * @param  {Float} scale
 * @param  {SVGPoint|Object} point    An object that has x and y attributes
 * @param  {Boolean} absolute Marks zoom scale as relative or absolute
 */
SvgPanZoom.prototype.publicZoomAtPoint = function(scale, point, absolute) {
  if (absolute) {
    // Transform zoom into a relative value
    scale = this.computeFromRelativeZoom(scale)
  }

  // If not a SVGPoint but has x and y then create a SVGPoint
  if (Utils.getType(point) !== 'SVGPoint') {
    if('x' in point && 'y' in point) {
      point = SvgUtils.createSVGPoint(this.svg, point.x, point.y)
    } else {
      throw new Error('Given point is invalid')
    }
  }

  this.zoomAtPoint(scale, point, absolute)
}

/**
 * Get zoom scale
 *
 * @return {Float} zoom scale
 */
SvgPanZoom.prototype.getZoom = function() {
  return this.viewport.getZoom()
}

/**
 * Get zoom scale for public usage
 *
 * @return {Float} zoom scale
 */
SvgPanZoom.prototype.getRelativeZoom = function() {
  return this.viewport.getRelativeZoom()
}

/**
 * Compute actual zoom from public zoom
 *
 * @param  {Float} zoom
 * @return {Float} zoom scale
 */
SvgPanZoom.prototype.computeFromRelativeZoom = function(zoom) {
  return zoom * this.viewport.getOriginalState().zoom
}

/**
 * Set zoom to initial state
 */
SvgPanZoom.prototype.resetZoom = function() {
  var originalState = this.viewport.getOriginalState()

  this.zoom(originalState.zoom, true);
}

/**
 * Set pan to initial state
 */
SvgPanZoom.prototype.resetPan = function() {
  this.pan(this.viewport.getOriginalState());
}

/**
 * Set pan and zoom to initial state
 */
SvgPanZoom.prototype.reset = function() {
  this.resetZoom()
  this.resetPan()
}

/**
 * Handle double click event
 * See handleMouseDown() for alternate detection method
 *
 * @param {Event} evt
 */
SvgPanZoom.prototype.handleDblClick = function(evt) {
  if (this.options.preventMouseEventsDefault) {
    if (evt.preventDefault) {
      evt.preventDefault()
    } else {
      evt.returnValue = false
    }
  }

  // Check if target was a control button
  if (this.options.controlIconsEnabled) {
    var targetClass = evt.target.getAttribute('class') || ''
    if (targetClass.indexOf('svg-pan-zoom-control') > -1) {
      return false
    }
  }

  var zoomFactor

  if (evt.shiftKey) {
    zoomFactor = 1/((1 + this.options.zoomScaleSensitivity) * 2) // zoom out when shift key pressed
  } else {
    zoomFactor = (1 + this.options.zoomScaleSensitivity) * 2
  }

  var point = SvgUtils.getEventPoint(evt, this.svg).matrixTransform(this.svg.getScreenCTM().inverse())
  this.zoomAtPoint(zoomFactor, point)
}

/**
 * Handle click event
 *
 * @param {Event} evt
 */
SvgPanZoom.prototype.handleMouseDown = function(evt, prevEvt) {
  if (this.options.preventMouseEventsDefault) {
    if (evt.preventDefault) {
      evt.preventDefault()
    } else {
      evt.returnValue = false
    }
  }

  Utils.mouseAndTouchNormalize(evt, this.svg)

  // Double click detection; more consistent than ondblclick
  if (this.options.dblClickZoomEnabled && Utils.isDblClick(evt, prevEvt)){
    this.handleDblClick(evt)
  } else {
    // Pan mode
    this.state = 'pan'
    this.firstEventCTM = this.viewport.getCTM()
    this.stateOrigin = SvgUtils.getEventPoint(evt, this.svg).matrixTransform(this.firstEventCTM.inverse())
  }
}

/**
 * Handle mouse move event
 *
 * @param  {Event} evt
 */
SvgPanZoom.prototype.handleMouseMove = function(evt) {
  if (this.options.preventMouseEventsDefault) {
    if (evt.preventDefault) {
      evt.preventDefault()
    } else {
      evt.returnValue = false
    }
  }

  if (this.state === 'pan' && this.options.panEnabled) {
    // Pan mode
    var point = SvgUtils.getEventPoint(evt, this.svg).matrixTransform(this.firstEventCTM.inverse())
      , viewportCTM = this.firstEventCTM.translate(point.x - this.stateOrigin.x, point.y - this.stateOrigin.y)

    this.viewport.setCTM(viewportCTM)
  }
}

/**
 * Handle mouse button release event
 *
 * @param {Event} evt
 */
SvgPanZoom.prototype.handleMouseUp = function(evt) {
  if (this.options.preventMouseEventsDefault) {
    if (evt.preventDefault) {
      evt.preventDefault()
    } else {
      evt.returnValue = false
    }
  }

  if (this.state === 'pan') {
    // Quit pan mode
    this.state = 'none'
  }
}

/**
 * Adjust viewport size (only) so it will fit in SVG
 * Does not center image
 */
SvgPanZoom.prototype.fit = function() {
  var viewBox = this.viewport.getViewBox()
    , newScale = Math.min(this.width/viewBox.width, this.height/viewBox.height)

  this.zoom(newScale, true)
}

/**
 * Adjust viewport size (only) so it will contain the SVG
 * Does not center image
 */
SvgPanZoom.prototype.contain = function() {
  var viewBox = this.viewport.getViewBox()
    , newScale = Math.max(this.width/viewBox.width, this.height/viewBox.height)

  this.zoom(newScale, true)
}

/**
 * Adjust viewport pan (only) so it will be centered in SVG
 * Does not zoom/fit/contain image
 */
SvgPanZoom.prototype.center = function() {
  var viewBox = this.viewport.getViewBox()
    , offsetX = (this.width - (viewBox.width + viewBox.x * 2) * this.getZoom()) * 0.5
    , offsetY = (this.height - (viewBox.height + viewBox.y * 2) * this.getZoom()) * 0.5

  this.getPublicInstance().pan({x: offsetX, y: offsetY})
}

/**
 * Update content cached BorderBox
 * Use when viewport contents change
 */
SvgPanZoom.prototype.updateBBox = function() {
  this.viewport.simpleViewBoxCache()
}

/**
 * Pan to a rendered position
 *
 * @param  {Object} point {x: 0, y: 0}
 */
SvgPanZoom.prototype.pan = function(point) {
  var viewportCTM = this.viewport.getCTM()
  viewportCTM.e = point.x
  viewportCTM.f = point.y
  this.viewport.setCTM(viewportCTM)
}

/**
 * Relatively pan the graph by a specified rendered position vector
 *
 * @param  {Object} point {x: 0, y: 0}
 */
SvgPanZoom.prototype.panBy = function(point) {
  var viewportCTM = this.viewport.getCTM()
  viewportCTM.e += point.x
  viewportCTM.f += point.y
  this.viewport.setCTM(viewportCTM)
}

/**
 * Get pan vector
 *
 * @return {Object} {x: 0, y: 0}
 */
SvgPanZoom.prototype.getPan = function() {
  var state = this.viewport.getState()

  return {x: state.x, y: state.y}
}

/**
 * Recalculates cached svg dimensions and controls position
 */
SvgPanZoom.prototype.resize = function() {
  // Get dimensions
  var boundingClientRectNormalized = SvgUtils.getBoundingClientRectNormalized(this.svg)
  this.width = boundingClientRectNormalized.width
  this.height = boundingClientRectNormalized.height

  // Recalculate original state
  var viewport = this.viewport
  viewport.options.width = this.width
  viewport.options.height = this.height
  viewport.processCTM()

  // Reposition control icons by re-enabling them
  if (this.options.controlIconsEnabled) {
    this.getPublicInstance().disableControlIcons()
    this.getPublicInstance().enableControlIcons()
  }
}

/**
 * Unbind mouse events, free callbacks and destroy public instance
 */
SvgPanZoom.prototype.destroy = function() {
  var that = this

  // Free callbacks
  this.beforeZoom = null
  this.onZoom = null
  this.beforePan = null
  this.onPan = null
  this.onUpdatedCTM = null

  // Destroy custom event handlers
  if (this.options.customEventsHandler != null) { // jshint ignore:line
    this.options.customEventsHandler.destroy({
      svgElement: this.svg
    , eventsListenerElement: this.options.eventsListenerElement
    , instance: this.getPublicInstance()
    })
  }

  // Unbind eventListeners
  for (var event in this.eventListeners) {
    (this.options.eventsListenerElement || this.svg)
      .removeEventListener(event, this.eventListeners[event], false)
  }

  // Unbind wheelListener
  this.disableMouseWheelZoom()

  // Remove control icons
  this.getPublicInstance().disableControlIcons()

  // Reset zoom and pan
  this.reset()

  // Remove instance from instancesStore
  instancesStore = instancesStore.filter(function(instance){
    return instance.svg !== that.svg
  })

  // Delete options and its contents
  delete this.options

  // Delete viewport to make public shadow viewport functions uncallable
  delete this.viewport

  // Destroy public instance and rewrite getPublicInstance
  delete this.publicInstance
  delete this.pi
  this.getPublicInstance = function(){
    return null
  }
}

/**
 * Returns a public instance object
 *
 * @return {Object} Public instance object
 */
SvgPanZoom.prototype.getPublicInstance = function() {
  var that = this

  // Create cache
  if (!this.publicInstance) {
    this.publicInstance = this.pi = {
      // Pan
      enablePan: function() {that.options.panEnabled = true; return that.pi}
    , disablePan: function() {that.options.panEnabled = false; return that.pi}
    , isPanEnabled: function() {return !!that.options.panEnabled}
    , pan: function(point) {that.pan(point); return that.pi}
    , panBy: function(point) {that.panBy(point); return that.pi}
    , getPan: function() {return that.getPan()}
      // Pan event
    , setBeforePan: function(fn) {that.options.beforePan = fn === null ? null : Utils.proxy(fn, that.publicInstance); return that.pi}
    , setOnPan: function(fn) {that.options.onPan = fn === null ? null : Utils.proxy(fn, that.publicInstance); return that.pi}
      // Zoom and Control Icons
    , enableZoom: function() {that.options.zoomEnabled = true; return that.pi}
    , disableZoom: function() {that.options.zoomEnabled = false; return that.pi}
    , isZoomEnabled: function() {return !!that.options.zoomEnabled}
    , enableControlIcons: function() {
        if (!that.options.controlIconsEnabled) {
          that.options.controlIconsEnabled = true
          ControlIcons.enable(that)
        }
        return that.pi
      }
    , disableControlIcons: function() {
        if (that.options.controlIconsEnabled) {
          that.options.controlIconsEnabled = false;
          ControlIcons.disable(that)
        }
        return that.pi
      }
    , isControlIconsEnabled: function() {return !!that.options.controlIconsEnabled}
      // Double click zoom
    , enableDblClickZoom: function() {that.options.dblClickZoomEnabled = true; return that.pi}
    , disableDblClickZoom: function() {that.options.dblClickZoomEnabled = false; return that.pi}
    , isDblClickZoomEnabled: function() {return !!that.options.dblClickZoomEnabled}
      // Mouse wheel zoom
    , enableMouseWheelZoom: function() {that.enableMouseWheelZoom(); return that.pi}
    , disableMouseWheelZoom: function() {that.disableMouseWheelZoom(); return that.pi}
    , isMouseWheelZoomEnabled: function() {return !!that.options.mouseWheelZoomEnabled}
      // Zoom scale and bounds
    , setZoomScaleSensitivity: function(scale) {that.options.zoomScaleSensitivity = scale; return that.pi}
    , setMinZoom: function(zoom) {that.options.minZoom = zoom; return that.pi}
    , setMaxZoom: function(zoom) {that.options.maxZoom = zoom; return that.pi}
      // Zoom event
    , setBeforeZoom: function(fn) {that.options.beforeZoom = fn === null ? null : Utils.proxy(fn, that.publicInstance); return that.pi}
    , setOnZoom: function(fn) {that.options.onZoom = fn === null ? null : Utils.proxy(fn, that.publicInstance); return that.pi}
      // Zooming
    , zoom: function(scale) {that.publicZoom(scale, true); return that.pi}
    , zoomBy: function(scale) {that.publicZoom(scale, false); return that.pi}
    , zoomAtPoint: function(scale, point) {that.publicZoomAtPoint(scale, point, true); return that.pi}
    , zoomAtPointBy: function(scale, point) {that.publicZoomAtPoint(scale, point, false); return that.pi}
    , zoomIn: function() {this.zoomBy(1 + that.options.zoomScaleSensitivity); return that.pi}
    , zoomOut: function() {this.zoomBy(1 / (1 + that.options.zoomScaleSensitivity)); return that.pi}
    , getZoom: function() {return that.getRelativeZoom()}
      // CTM update
    , setOnUpdatedCTM: function(fn) {that.options.onUpdatedCTM = fn === null ? null : Utils.proxy(fn, that.publicInstance); return that.pi}
      // Reset
    , resetZoom: function() {that.resetZoom(); return that.pi}
    , resetPan: function() {that.resetPan(); return that.pi}
    , reset: function() {that.reset(); return that.pi}
      // Fit, Contain and Center
    , fit: function() {that.fit(); return that.pi}
    , contain: function() {that.contain(); return that.pi}
    , center: function() {that.center(); return that.pi}
      // Size and Resize
    , updateBBox: function() {that.updateBBox(); return that.pi}
    , resize: function() {that.resize(); return that.pi}
    , getSizes: function() {
        return {
          width: that.width
        , height: that.height
        , realZoom: that.getZoom()
        , viewBox: that.viewport.getViewBox()
        }
      }
      // Destroy
    , destroy: function() {that.destroy(); return that.pi}
    }
  }

  return this.publicInstance
}

/**
 * Stores pairs of instances of SvgPanZoom and SVG
 * Each pair is represented by an object {svg: SVGSVGElement, instance: SvgPanZoom}
 *
 * @type {Array}
 */
var instancesStore = []

var svgPanZoom = function(elementOrSelector, options){
  var svg = Utils.getSvg(elementOrSelector)

  if (svg === null) {
    return null
  } else {
    // Look for existent instance
    for(var i = instancesStore.length - 1; i >= 0; i--) {
      if (instancesStore[i].svg === svg) {
        return instancesStore[i].instance.getPublicInstance()
      }
    }

    // If instance not found - create one
    instancesStore.push({
      svg: svg
    , instance: new SvgPanZoom(svg, options)
    })

    // Return just pushed instance
    return instancesStore[instancesStore.length - 1].instance.getPublicInstance()
  }
}

module.exports = svgPanZoom;

},{"./control-icons":2,"./shadow-viewport":3,"./svg-utilities":5,"./uniwheel":6,"./utilities":7}],5:[function(require,module,exports){
var Utils = require('./utilities')
  , _browser = 'unknown'
  ;

// http://stackoverflow.com/questions/9847580/how-to-detect-safari-chrome-ie-firefox-and-opera-browser
if (/*@cc_on!@*/false || !!document.documentMode) { // internet explorer
  _browser = 'ie';
}

module.exports = {
  svgNS:  'http://www.w3.org/2000/svg'
, xmlNS:  'http://www.w3.org/XML/1998/namespace'
, xmlnsNS:  'http://www.w3.org/2000/xmlns/'
, xlinkNS:  'http://www.w3.org/1999/xlink'
, evNS:  'http://www.w3.org/2001/xml-events'

  /**
   * Get svg dimensions: width and height
   *
   * @param  {SVGSVGElement} svg
   * @return {Object}     {width: 0, height: 0}
   */
, getBoundingClientRectNormalized: function(svg) {
    if (svg.clientWidth && svg.clientHeight) {
      return {width: svg.clientWidth, height: svg.clientHeight}
    } else if (!!svg.getBoundingClientRect()) {
      return svg.getBoundingClientRect();
    } else {
      throw new Error('Cannot get BoundingClientRect for SVG.');
    }
  }

  /**
   * Gets g element with class of "viewport" or creates it if it doesn't exist
   *
   * @param  {SVGSVGElement} svg
   * @return {SVGElement}     g (group) element
   */
, getOrCreateViewport: function(svg, selector) {
    var viewport = null

    if (Utils.isElement(selector)) {
      viewport = selector
    } else {
      viewport = svg.querySelector(selector)
    }

    // Check if there is just one main group in SVG
    if (!viewport) {
      var childNodes = Array.prototype.slice.call(svg.childNodes || svg.children).filter(function(el){
        return el.nodeName !== 'defs' && el.nodeName !== '#text'
      })

      // Node name should be SVGGElement and should have no transform attribute
      // Groups with transform are not used as viewport because it involves parsing of all transform possibilities
      if (childNodes.length === 1 && childNodes[0].nodeName === 'g' && childNodes[0].getAttribute('transform') === null) {
        viewport = childNodes[0]
      }
    }

    // If no favorable group element exists then create one
    if (!viewport) {
      var viewportId = 'viewport-' + new Date().toISOString().replace(/\D/g, '');
      viewport = document.createElementNS(this.svgNS, 'g');
      viewport.setAttribute('id', viewportId);

      // Internet Explorer (all versions?) can't use childNodes, but other browsers prefer (require?) using childNodes
      var svgChildren = svg.childNodes || svg.children;
      if (!!svgChildren && svgChildren.length > 0) {
        for (var i = svgChildren.length; i > 0; i--) {
          // Move everything into viewport except defs
          if (svgChildren[svgChildren.length - i].nodeName !== 'defs') {
            viewport.appendChild(svgChildren[svgChildren.length - i]);
          }
        }
      }
      svg.appendChild(viewport);
    }

    // Parse class names
    var classNames = [];
    if (viewport.getAttribute('class')) {
      classNames = viewport.getAttribute('class').split(' ')
    }

    // Set class (if not set already)
    if (!~classNames.indexOf('svg-pan-zoom_viewport')) {
      classNames.push('svg-pan-zoom_viewport')
      viewport.setAttribute('class', classNames.join(' '))
    }

    return viewport
  }

  /**
   * Set SVG attributes
   *
   * @param  {SVGSVGElement} svg
   */
  , setupSvgAttributes: function(svg) {
    // Setting default attributes
    svg.setAttribute('xmlns', this.svgNS);
    svg.setAttributeNS(this.xmlnsNS, 'xmlns:xlink', this.xlinkNS);
    svg.setAttributeNS(this.xmlnsNS, 'xmlns:ev', this.evNS);

    // Needed for Internet Explorer, otherwise the viewport overflows
    if (svg.parentNode !== null) {
      var style = svg.getAttribute('style') || '';
      if (style.toLowerCase().indexOf('overflow') === -1) {
        svg.setAttribute('style', 'overflow: hidden; ' + style);
      }
    }
  }

/**
 * How long Internet Explorer takes to finish updating its display (ms).
 */
, internetExplorerRedisplayInterval: 300

/**
 * Forces the browser to redisplay all SVG elements that rely on an
 * element defined in a 'defs' section. It works globally, for every
 * available defs element on the page.
 * The throttling is intentionally global.
 *
 * This is only needed for IE. It is as a hack to make markers (and 'use' elements?)
 * visible after pan/zoom when there are multiple SVGs on the page.
 * See bug report: https://connect.microsoft.com/IE/feedback/details/781964/
 * also see svg-pan-zoom issue: https://github.com/ariutta/svg-pan-zoom/issues/62
 */
, refreshDefsGlobal: Utils.throttle(function() {
    var allDefs = document.querySelectorAll('defs');
    var allDefsCount = allDefs.length;
    for (var i = 0; i < allDefsCount; i++) {
      var thisDefs = allDefs[i];
      thisDefs.parentNode.insertBefore(thisDefs, thisDefs);
    }
  }, this.internetExplorerRedisplayInterval)

  /**
   * Sets the current transform matrix of an element
   *
   * @param {SVGElement} element
   * @param {SVGMatrix} matrix  CTM
   * @param {SVGElement} defs
   */
, setCTM: function(element, matrix, defs) {
    var that = this
      , s = 'matrix(' + matrix.a + ',' + matrix.b + ',' + matrix.c + ',' + matrix.d + ',' + matrix.e + ',' + matrix.f + ')';

    element.setAttributeNS(null, 'transform', s);
    if ('transform' in element.style) {
      element.style.transform = s;
    } else if ('-ms-transform' in element.style) {
      element.style['-ms-transform'] = s;
    } else if ('-webkit-transform' in element.style) {
      element.style['-webkit-transform'] = s;
    }

    // IE has a bug that makes markers disappear on zoom (when the matrix "a" and/or "d" elements change)
    // see http://stackoverflow.com/questions/17654578/svg-marker-does-not-work-in-ie9-10
    // and http://srndolha.wordpress.com/2013/11/25/svg-line-markers-may-disappear-in-internet-explorer-11/
    if (_browser === 'ie' && !!defs) {
      // this refresh is intended for redisplaying the SVG during zooming
      defs.parentNode.insertBefore(defs, defs);
      // this refresh is intended for redisplaying the other SVGs on a page when panning a given SVG
      // it is also needed for the given SVG itself, on zoomEnd, if the SVG contains any markers that
      // are located under any other element(s).
      window.setTimeout(function() {
        that.refreshDefsGlobal();
      }, that.internetExplorerRedisplayInterval);
    }
  }

  /**
   * Instantiate an SVGPoint object with given event coordinates
   *
   * @param {Event} evt
   * @param  {SVGSVGElement} svg
   * @return {SVGPoint}     point
   */
, getEventPoint: function(evt, svg) {
    var point = svg.createSVGPoint()

    Utils.mouseAndTouchNormalize(evt, svg)

    point.x = evt.clientX
    point.y = evt.clientY

    return point
  }

  /**
   * Get SVG center point
   *
   * @param  {SVGSVGElement} svg
   * @return {SVGPoint}
   */
, getSvgCenterPoint: function(svg, width, height) {
    return this.createSVGPoint(svg, width / 2, height / 2)
  }

  /**
   * Create a SVGPoint with given x and y
   *
   * @param  {SVGSVGElement} svg
   * @param  {Number} x
   * @param  {Number} y
   * @return {SVGPoint}
   */
, createSVGPoint: function(svg, x, y) {
    var point = svg.createSVGPoint()
    point.x = x
    point.y = y

    return point
  }
}

},{"./utilities":7}],6:[function(require,module,exports){
// uniwheel 0.1.2 (customized)
// A unified cross browser mouse wheel event handler
// https://github.com/teemualap/uniwheel

module.exports = (function(){

  //Full details: https://developer.mozilla.org/en-US/docs/Web/Reference/Events/wheel

  var prefix = "", _addEventListener, _removeEventListener, onwheel, support, fns = [];

  // detect event model
  if ( window.addEventListener ) {
    _addEventListener = "addEventListener";
    _removeEventListener = "removeEventListener";
  } else {
    _addEventListener = "attachEvent";
    _removeEventListener = "detachEvent";
    prefix = "on";
  }

  // detect available wheel event
  support = "onwheel" in document.createElement("div") ? "wheel" : // Modern browsers support "wheel"
            document.onmousewheel !== undefined ? "mousewheel" : // Webkit and IE support at least "mousewheel"
            "DOMMouseScroll"; // let's assume that remaining browsers are older Firefox


  function createCallback(element,callback,capture) {

    var fn = function(originalEvent) {

      !originalEvent && ( originalEvent = window.event );

      // create a normalized event object
      var event = {
        // keep a ref to the original event object
        originalEvent: originalEvent,
        target: originalEvent.target || originalEvent.srcElement,
        type: "wheel",
        deltaMode: originalEvent.type == "MozMousePixelScroll" ? 0 : 1,
        deltaX: 0,
        delatZ: 0,
        preventDefault: function() {
          originalEvent.preventDefault ?
            originalEvent.preventDefault() :
            originalEvent.returnValue = false;
        }
      };

      // calculate deltaY (and deltaX) according to the event
      if ( support == "mousewheel" ) {
        event.deltaY = - 1/40 * originalEvent.wheelDelta;
        // Webkit also support wheelDeltaX
        originalEvent.wheelDeltaX && ( event.deltaX = - 1/40 * originalEvent.wheelDeltaX );
      } else {
        event.deltaY = originalEvent.detail;
      }

      // it's time to fire the callback
      return callback( event );

    };

    fns.push({
      element: element,
      fn: fn,
      capture: capture
    });

    return fn;
  }

  function getCallback(element,capture) {
    for (var i = 0; i < fns.length; i++) {
      if (fns[i].element === element && fns[i].capture === capture) {
        return fns[i].fn;
      }
    }
    return function(){};
  }

  function removeCallback(element,capture) {
    for (var i = 0; i < fns.length; i++) {
      if (fns[i].element === element && fns[i].capture === capture) {
        return fns.splice(i,1);
      }
    }
  }

  function _addWheelListener( elem, eventName, callback, useCapture ) {

    var cb;

    if (support === "wheel") {
      cb = callback;
    } else {
      cb = createCallback(elem,callback,useCapture);
    }

    elem[ _addEventListener ]( prefix + eventName, cb, useCapture || false );

  }

  function _removeWheelListener( elem, eventName, callback, useCapture ) {

    var cb;

    if (support === "wheel") {
      cb = callback;
    } else {
      cb = getCallback(elem,useCapture);
    }

    elem[ _removeEventListener ]( prefix + eventName, cb, useCapture || false );

    removeCallback(elem,useCapture);

  }

  function addWheelListener( elem, callback, useCapture ) {
    _addWheelListener( elem, support, callback, useCapture );

    // handle MozMousePixelScroll in older Firefox
    if( support == "DOMMouseScroll" ) {
        _addWheelListener( elem, "MozMousePixelScroll", callback, useCapture);
    }
  }

  function removeWheelListener(elem,callback,useCapture){
    _removeWheelListener(elem,support,callback,useCapture);

    // handle MozMousePixelScroll in older Firefox
    if( support == "DOMMouseScroll" ) {
        _removeWheelListener(elem, "MozMousePixelScroll", callback, useCapture);
    }
  }

  return {
    on: addWheelListener,
    off: removeWheelListener
  };

})();

},{}],7:[function(require,module,exports){
module.exports = {
  /**
   * Extends an object
   *
   * @param  {Object} target object to extend
   * @param  {Object} source object to take properties from
   * @return {Object}        extended object
   */
  extend: function(target, source) {
    target = target || {};
    for (var prop in source) {
      // Go recursively
      if (this.isObject(source[prop])) {
        target[prop] = this.extend(target[prop], source[prop])
      } else {
        target[prop] = source[prop]
      }
    }
    return target;
  }

  /**
   * Checks if an object is a DOM element
   *
   * @param  {Object}  o HTML element or String
   * @return {Boolean}   returns true if object is a DOM element
   */
, isElement: function(o){
    return (
      o instanceof HTMLElement || o instanceof SVGElement || o instanceof SVGSVGElement || //DOM2
      (o && typeof o === 'object' && o !== null && o.nodeType === 1 && typeof o.nodeName === 'string')
    );
  }

  /**
   * Checks if an object is an Object
   *
   * @param  {Object}  o Object
   * @return {Boolean}   returns true if object is an Object
   */
, isObject: function(o){
    return Object.prototype.toString.call(o) === '[object Object]';
  }

  /**
   * Checks if variable is Number
   *
   * @param  {Integer|Float}  n
   * @return {Boolean}   returns true if variable is Number
   */
, isNumber: function(n) {
    return !isNaN(parseFloat(n)) && isFinite(n);
  }

  /**
   * Search for an SVG element
   *
   * @param  {Object|String} elementOrSelector DOM Element or selector String
   * @return {Object|Null}                   SVG or null
   */
, getSvg: function(elementOrSelector) {
    var element
      , svg;

    if (!this.isElement(elementOrSelector)) {
      // If selector provided
      if (typeof elementOrSelector === 'string' || elementOrSelector instanceof String) {
        // Try to find the element
        element = document.querySelector(elementOrSelector)

        if (!element) {
          throw new Error('Provided selector did not find any elements. Selector: ' + elementOrSelector)
          return null
        }
      } else {
        throw new Error('Provided selector is not an HTML object nor String')
        return null
      }
    } else {
      element = elementOrSelector
    }

    if (element.tagName.toLowerCase() === 'svg') {
      svg = element;
    } else {
      if (element.tagName.toLowerCase() === 'object') {
        svg = element.contentDocument.documentElement;
      } else {
        if (element.tagName.toLowerCase() === 'embed') {
          svg = element.getSVGDocument().documentElement;
        } else {
          if (element.tagName.toLowerCase() === 'img') {
            throw new Error('Cannot script an SVG in an "img" element. Please use an "object" element or an in-line SVG.');
          } else {
            throw new Error('Cannot get SVG.');
          }
          return null
        }
      }
    }

    return svg
  }

  /**
   * Attach a given context to a function
   * @param  {Function} fn      Function
   * @param  {Object}   context Context
   * @return {Function}           Function with certain context
   */
, proxy: function(fn, context) {
    return function() {
      return fn.apply(context, arguments)
    }
  }

  /**
   * Returns object type
   * Uses toString that returns [object SVGPoint]
   * And than parses object type from string
   *
   * @param  {Object} o Any object
   * @return {String}   Object type
   */
, getType: function(o) {
    return Object.prototype.toString.apply(o).replace(/^\[object\s/, '').replace(/\]$/, '')
  }

  /**
   * If it is a touch event than add clientX and clientY to event object
   *
   * @param  {Event} evt
   * @param  {SVGSVGElement} svg
   */
, mouseAndTouchNormalize: function(evt, svg) {
    // If no clientX then fallback
    if (evt.clientX === void 0 || evt.clientX === null) {
      // Fallback
      evt.clientX = 0
      evt.clientY = 0

      // If it is a touch event
      if (evt.touches !== void 0 && evt.touches.length) {
        if (evt.touches[0].clientX !== void 0) {
          evt.clientX = evt.touches[0].clientX
          evt.clientY = evt.touches[0].clientY
        } else if (evt.touches[0].pageX !== void 0) {
          var rect = svg.getBoundingClientRect();

          evt.clientX = evt.touches[0].pageX - rect.left
          evt.clientY = evt.touches[0].pageY - rect.top
        }
      // If it is a custom event
      } else if (evt.originalEvent !== void 0) {
        if (evt.originalEvent.clientX !== void 0) {
          evt.clientX = evt.originalEvent.clientX
          evt.clientY = evt.originalEvent.clientY
        }
      }
    }
  }

  /**
   * Check if an event is a double click/tap
   * TODO: For touch gestures use a library (hammer.js) that takes in account other events
   * (touchmove and touchend). It should take in account tap duration and traveled distance
   *
   * @param  {Event}  evt
   * @param  {Event}  prevEvt Previous Event
   * @return {Boolean}
   */
, isDblClick: function(evt, prevEvt) {
    // Double click detected by browser
    if (evt.detail === 2) {
      return true;
    }
    // Try to compare events
    else if (prevEvt !== void 0 && prevEvt !== null) {
      var timeStampDiff = evt.timeStamp - prevEvt.timeStamp // should be lower than 250 ms
        , touchesDistance = Math.sqrt(Math.pow(evt.clientX - prevEvt.clientX, 2) + Math.pow(evt.clientY - prevEvt.clientY, 2))

      return timeStampDiff < 250 && touchesDistance < 10
    }

    // Nothing found
    return false;
  }

  /**
   * Returns current timestamp as an integer
   *
   * @return {Number}
   */
, now: Date.now || function() {
    return new Date().getTime();
  }

  // From underscore.
  // Returns a function, that, when invoked, will only be triggered at most once
  // during a given window of time. Normally, the throttled function will run
  // as much as it can, without ever going more than once per `wait` duration;
  // but if you'd like to disable the execution on the leading edge, pass
  // `{leading: false}`. To disable execution on the trailing edge, ditto.
// jscs:disable
// jshint ignore:start
, throttle: function(func, wait, options) {
    var that = this;
    var context, args, result;
    var timeout = null;
    var previous = 0;
    if (!options) options = {};
    var later = function() {
      previous = options.leading === false ? 0 : that.now();
      timeout = null;
      result = func.apply(context, args);
      if (!timeout) context = args = null;
    };
    return function() {
      var now = that.now();
      if (!previous && options.leading === false) previous = now;
      var remaining = wait - (now - previous);
      context = this;
      args = arguments;
      if (remaining <= 0 || remaining > wait) {
        clearTimeout(timeout);
        timeout = null;
        previous = now;
        result = func.apply(context, args);
        if (!timeout) context = args = null;
      } else if (!timeout && options.trailing !== false) {
        timeout = setTimeout(later, remaining);
      }
      return result;
    };
  }
// jshint ignore:end
// jscs:enable

  /**
   * Create a requestAnimationFrame simulation
   *
   * @param  {Number|String} refreshRate
   * @return {Function}
   */
, createRequestAnimationFrame: function(refreshRate) {
    var timeout = null

    // Convert refreshRate to timeout
    if (refreshRate !== 'auto' && refreshRate < 60 && refreshRate > 1) {
      timeout = Math.floor(1000 / refreshRate)
    }

    if (timeout === null) {
      return window.requestAnimationFrame || requestTimeout(33)
    } else {
      return requestTimeout(timeout)
    }
  }
}

/**
 * Create a callback that will execute after a given timeout
 *
 * @param  {Function} timeout
 * @return {Function}
 */
function requestTimeout(timeout) {
  return function(callback) {
    window.setTimeout(callback, timeout)
  }
}

},{}]},{},[1]);