svg-pan-zoom-m/dist/svg-pan-zoom.js

JavaScript library for panning and zooming an SVG image from the mouse, touches and programmatically.

// svg-pan-zoom v3.6.1
// https://github.com/ariutta/svg-pan-zoom
(function(){function r(e,n,t){function o(i,f){if(!n[i]){if(!e[i]){var c="function"==typeof require&&require;if(!f&&c)return c(i,!0);if(u)return u(i,!0);var a=new Error("Cannot find module '"+i+"'");throw a.code="MODULE_NOT_FOUND",a}var p=n[i]={exports:{}};e[i][0].call(p.exports,function(r){var n=e[i][1][r];return o(n||r)},p,p.exports,r,e,n,t)}return n[i].exports}for(var u="function"==typeof require&&require,i=0;i<t.length;i++)o(t[i]);return o}return r})()({1:[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}],2:[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}],3:[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}],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,
  onlyMouseWheel: false // jusitfy if use `wheel` or `mousewheel` event
};

var passiveListenerOption = { passive: true };

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
  // eslint-disable-next-line eqeqeq
  if (this.options.customEventsHandler != null) {
    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],
      !this.options.preventMouseEventsDefault ? passiveListenerOption : 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
    var isPassiveListener = !this.options.preventMouseEventsDefault;
    Wheel.on(
      this.options.eventsListenerElement || this.svg,
      this.wheelListener,
      isPassiveListener
    );

    this.options.mouseWheelZoomEnabled = true;
  }
};

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

  if (this.options.onlyMouseWheel && !evt.ctrlKey) {
    return;
  }

  // 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
  // eslint-disable-next-line eqeqeq
  if (this.options.customEventsHandler != null) {
    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],
      !this.options.preventMouseEventsDefault ? passiveListenerOption : 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":1,"./shadow-viewport":2,"./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