// EWindow.js 
//
//   This Javascript is provided by Mike Williams
//   Blackpool Community Church Javascript Team
//   http://www.commchurch.freeserve.co.uk/   
//   http://econym.googlepages.com/index.htm
//
//   This work is licenced under a Creative Commons Licence
//   http://creativecommons.org/licenses/by/2.0/uk/
//
// Version 0.0  Initial version 
// Version 0.1  10/10/2006 Added E_STYLE_7 
// Version 0.2  17/05/2007 Added .isHidden() and .supportsHide()
// Version 0.3  14/09/2007 added .zindex()
// Version 0.4  09/02/2008 moved the window to the G_MAP_FLOAT_PANE


      function EStyle(stemImage, stemSize, boxClass, boxOffset) {
        this.stemImage = stemImage;
        this.stemSize = stemSize;
        this.boxClass = boxClass;
        this.boxOffset = boxOffset;
        //this.border = border;
        
        // Known fudge factors are:
        // Firefox (1.0.6 and 1.5)    5, -1
        // IE 6.0                     0, -1
        // Opera 8.54                 3, -1
        // Opera 9 prev               4, -1
        // Netscape (7.2, 8.0)        5, -1
        // Safari                     5, -1        
        
        var agent = navigator.userAgent.toLowerCase();
        
        var fudge = 5;  // assume Netscape if no match found
       
        if (agent.indexOf("opera") > -1) {
          fudge = 3;
        }   
        if (agent.indexOf("firefox") > -1) {
          fudge = 5;
        }   
        if (agent.indexOf("safari") > -1) {
          fudge = 5;
        }   
        if ((agent.indexOf("msie") > -1) && (agent.indexOf("opera") < 1)){
          fudge = 0;
        }
        this.fudge = fudge;
      }
      
      var E_STYLE_1 = new EStyle("stem1.png", new GSize(81,87),  "estyle1", new GPoint(-30,87-3));
      var E_STYLE_2 = new EStyle("stem2.png", new GSize(81,87),  "estyle2", new GPoint(1,-51));
      var E_STYLE_3 = new EStyle("stem3.png", new GSize(81,87),  "estyle3", new GPoint(-30,87-10));
      var E_STYLE_4 = new EStyle("stem3.png", new GSize(81,87),  "estyle4", new GPoint(-30,87-10));
      var E_STYLE_5 = new EStyle("stem1.png", new GSize(81,87),  "estyle5", new GPoint(-30,87-3));
      var E_STYLE_6 = new EStyle("stem6.png", new GSize(100,50), "estyle6", new GPoint(100-2,20));
      var E_STYLE_7 = new EStyle("stem7.png", new GSize(24,24),  "estyle2", new GPoint(-10,23));


      function EWindow(map,estyle) {
        // parameters
        this.map=map;
        this.estyle=estyle;
        // internal variables
        this.visible = false;
        // browser - specific variables
        this.ie = false;
        var agent = navigator.userAgent.toLowerCase();
        if ((agent.indexOf("msie") > -1) && (agent.indexOf("opera") < 1)){ this.ie = true} else {this.ie = false}
      } 
      
      EWindow.prototype = new GOverlay();

      EWindow.prototype.initialize = function(map) {
        var div1 = document.createElement("div");
        div1.style.position = "absolute";
        map.getPane(G_MAP_FLOAT_PANE).appendChild(div1);
        var div2 = document.createElement("div");
        div2.style.position = "absolute";
        div2.style.width = this.estyle.stemSize.width+"px";
        map.getPane(G_MAP_FLOAT_PANE).appendChild(div2);
        this.div1 = div1;
        this.div2 = div2;
      }

      EWindow.prototype.openOnMap = function(point, html, offset) {
        this.offset = offset||new GPoint(0,0);
        this.point = point;
        this.div1.innerHTML = '<div class="' + this.estyle.boxClass + '"><nobr>' + html + '</nobr></div>';
        if (this.ie && this.estyle.stemImage.toLowerCase().indexOf(".png")>-1) {
          var loader = "filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(src='"+this.estyle.stemImage+"', sizingMethod='scale');";
          this.div2.innerHTML = '<div style="height:' +this.estyle.stemSize.height+ 'px; width:'+this.estyle.stemSize.width+'px; ' +loader+ '" ></div>';
        } else {
          this.div2.innerHTML = '<img src="' + this.estyle.stemImage + '" width="' + this.estyle.stemSize.width +'" height="' + this.estyle.stemSize.height +'">';
        }
        var z = GOverlay.getZIndex(this.point.lat());
        this.div1.style.zIndex = z;
        this.div2.style.zIndex = z+1;
        this.visible = true;
        this.show();
        this.redraw(true);
      }
      
      EWindow.prototype.openOnMarker = function(marker,html) {
        var vx = marker.getIcon().iconAnchor.x - marker.getIcon().infoWindowAnchor.x;
        var vy = marker.getIcon().iconAnchor.y - marker.getIcon().infoWindowAnchor.y;
        this.openOnMap(marker.getPoint(), html, new GPoint(vx,vy));
      }
      

      EWindow.prototype.redraw = function(force) {
        if (!this.visible) {return;}
        var p = this.map.fromLatLngToDivPixel(this.point);
        this.div2.style.left   = (p.x + this.offset.x) + "px";
        this.div2.style.bottom = (-p.y + this.offset.y -this.estyle.fudge) + "px";
        this.div1.style.left   = (p.x + this.offset.x + this.estyle.boxOffset.x) + "px";
        this.div1.style.bottom = (-p.y + this.offset.y + this.estyle.boxOffset.y) + "px";
      }

      EWindow.prototype.remove = function() {
        this.div1.parentNode.removeChild(this.div1);
        this.div2.parentNode.removeChild(this.div2);
        this.visible = false;
      }

      EWindow.prototype.copy = function() {
        return new EWindow(this.map, this.estyle);
      }

      EWindow.prototype.show = function() {
        this.div1.style.display="";
        this.div2.style.display="";
        this.visible = true;
      }
      
      EWindow.prototype.hide = function() {
        this.div1.style.display="none";
        this.div2.style.display="none";
        this.visible = false;
      }
      
      EWindow.prototype.isHidden = function() {
        return !this.visible;
      }
      
      EWindow.prototype.supportsHide = function() {
        return true;
      }

      EWindow.prototype.zindex = function(zin) {
        var z = GOverlay.getZIndex(this.point.lat());
        this.div1.style.zIndex = z+zin;
        this.div2.style.zIndex = z+1+zin;
      }


/*********************************************************************\
*                                                                     *
* epolys.js                                          by Mike Williams *
*                                                                     *
* A Google Maps API Extension                                         *
*                                                                     *
* Adds various Methods to GPolygon and GPolyline                      *
*                                                                     *
* .Contains(latlng) returns true is the poly contains the specified   *
*                   GLatLng                                           *
*                                                                     *
* .Area()           returns the approximate area of a poly that is    *
*                   not self-intersecting                             *
*                                                                     *
* .Distance()       returns the length of the poly path               *
*                                                                     *
* .Bounds()         returns a GLatLngBounds that bounds the poly      *
*                                                                     *
* .GetPointAtDistance() returns a GLatLng at the specified distance   *
*                   along the path.                                   *
*                   The distance is specified in metres               *
*                   Reurns null if the path is shorter than that      *
*                                                                     *
* .GetIndexAtDistance() returns the vertex number at the specified    *
*                   distance along the path.                          *
*                   The distance is specified in metres               *
*                   Reurns null if the path is shorter than that      *
*                                                                     *
* .Bearing(v1?,v2?) returns the bearing between two vertices          *
*                   if v1 is null, returns bearing from first to last *
*                   if v2 is null, returns bearing from v1 to next    *
*                                                                     *
*                                                                     *
***********************************************************************
*                                                                     *
*   This Javascript is provided by Mike Williams                      *
*   Blackpool Community Church Javascript Team                        *
*   http://www.commchurch.freeserve.co.uk/                            *
*   http://econym.googlepages.com/index.htm                           *
*                                                                     *
*   This work is licenced under a Creative Commons Licence            *
*   http://creativecommons.org/licenses/by/2.0/uk/                    *
*                                                                     *
***********************************************************************
*                                                                     *
* Version 1.1       6-Jun-2007                                        *
* Version 1.2       1-Jul-2007 - fix: Bounds was omitting vertex zero *
*                                add: Bearing                         *
*                                                                     *
\*********************************************************************/


// === A method for testing if a point is inside a polygon
// === Returns true if poly contains point
// === Algorithm shamelessly stolen from http://alienryderflex.com/polygon/ 
GPolygon.prototype.Contains = function(point) {
  var j=0;
  var oddNodes = false;
  var x = point.lng();
  var y = point.lat();
  for (var i=0; i < this.getVertexCount(); i++) {
    j++;
    if (j == this.getVertexCount()) {j = 0;}
    if (((this.getVertex(i).lat() < y) && (this.getVertex(j).lat() >= y))
    || ((this.getVertex(j).lat() < y) && (this.getVertex(i).lat() >= y))) {
      if ( this.getVertex(i).lng() + (y - this.getVertex(i).lat())
      /  (this.getVertex(j).lat()-this.getVertex(i).lat())
      *  (this.getVertex(j).lng() - this.getVertex(i).lng())<x ) {
        oddNodes = !oddNodes
      }
    }
  }
  return oddNodes;
}

// === A method which returns the approximate area of a non-intersecting polygon in square metres ===
// === It doesn't fully account for spechical geometry, so will be inaccurate for large polygons ===
// === The polygon must not intersect itself ===
GPolygon.prototype.Area = function() {
  var a = 0;
  var j = 0;
  var b = this.Bounds();
  var x0 = b.getSouthWest().lng();
  var y0 = b.getSouthWest().lat();
  for (var i=0; i < this.getVertexCount(); i++) {
    j++;
    if (j == this.getVertexCount()) {j = 0;}
    var x1 = this.getVertex(i).distanceFrom(new GLatLng(this.getVertex(i).lat(),x0));
    var x2 = this.getVertex(j).distanceFrom(new GLatLng(this.getVertex(j).lat(),x0));
    var y1 = this.getVertex(i).distanceFrom(new GLatLng(y0,this.getVertex(i).lng()));
    var y2 = this.getVertex(j).distanceFrom(new GLatLng(y0,this.getVertex(j).lng()));
    a += x1*y2 - x2*y1;
  }
  return Math.abs(a * 0.5);
}

// === A method which returns the length of a path in metres ===
GPolygon.prototype.Distance = function() {
  var dist = 0;
  for (var i=1; i < this.getVertexCount(); i++) {
    dist += this.getVertex(i).distanceFrom(this.getVertex(i-1));
  }
  return dist;
}

// === A method which returns the bounds as a GLatLngBounds ===
GPolygon.prototype.Bounds = function() {
  var bounds = new GLatLngBounds();
  for (var i=0; i < this.getVertexCount(); i++) {
    bounds.extend(this.getVertex(i));
  }
  return bounds;
}

// === A method which returns a GLatLng of a point a given distance along the path ===
// === Returns null if the path is shorter than the specified distance ===
GPolygon.prototype.GetPointAtDistance = function(metres) {
  // some awkward special cases
  if (metres == 0) return this.getVertex(0);
  if (metres < 0) return null;
  var dist=0;
  var olddist=0;
  for (var i=1; (i < this.getVertexCount() && dist < metres); i++) {
    olddist = dist;
    dist += this.getVertex(i).distanceFrom(this.getVertex(i-1));
  }
  if (dist < metres) {return null;}
  var p1= this.getVertex(i-2);
  var p2= this.getVertex(i-1);
  var m = (metres-olddist)/(dist-olddist);
  return new GLatLng( p1.lat() + (p2.lat()-p1.lat())*m, p1.lng() + (p2.lng()-p1.lng())*m);
}

// === A method which returns the Vertex number at a given distance along the path ===
// === Returns null if the path is shorter than the specified distance ===
GPolygon.prototype.GetIndexAtDistance = function(metres) {
  // some awkward special cases
  if (metres == 0) return this.getVertex(0);
  if (metres < 0) return null;
  var dist=0;
  var olddist=0;
  for (var i=1; (i < this.getVertexCount() && dist < metres); i++) {
    olddist = dist;
    dist += this.getVertex(i).distanceFrom(this.getVertex(i-1));
  }
  if (dist < metres) {return null;}
  return i;
}

// === A function which returns the bearing between two vertices in decgrees from 0 to 360===
// === If v1 is null, it returns the bearing between the first and last vertex ===
// === If v1 is present but v2 is null, returns the bearing from v1 to the next vertex ===
// === If either vertex is out of range, returns void ===
GPolygon.prototype.Bearing = function(v1,v2) {
  if (v1 == null) {
    v1 = 0;
    v2 = this.getVertexCount()-1;
  } else if (v2 ==  null) {
    v2 = v1+1;
  }
  if ((v1 < 0) || (v1 >= this.getVertexCount()) || (v2 < 0) || (v2 >= this.getVertexCount())) {
    return;
  }
  var from = this.getVertex(v1);
  var to = this.getVertex(v2);
  if (from.equals(to)) {
    return 0;
  }
  var lat1 = from.latRadians();
  var lon1 = from.lngRadians();
  var lat2 = to.latRadians();
  var lon2 = to.lngRadians();
  var angle = - Math.atan2( Math.sin( lon1 - lon2 ) * Math.cos( lat2 ), Math.cos( lat1 ) * Math.sin( lat2 ) - Math.sin( lat1 ) * Math.cos( lat2 ) * Math.cos( lon1 - lon2 ) );
  if ( angle < 0.0 ) angle  += Math.PI * 2.0;
  angle = angle * 180.0 / Math.PI;
  return parseFloat(angle.toFixed(1));
}




// === Copy all the above functions to GPolyline ===
GPolyline.prototype.Contains             = GPolygon.prototype.Contains;
GPolyline.prototype.Area                 = GPolygon.prototype.Area;
GPolyline.prototype.Distance             = GPolygon.prototype.Distance;
GPolyline.prototype.Bounds               = GPolygon.prototype.Bounds;
GPolyline.prototype.GetPointAtDistance   = GPolygon.prototype.GetPointAtDistance;
GPolyline.prototype.GetIndexAtDistance   = GPolygon.prototype.GetIndexAtDistance;
GPolyline.prototype.Bearing              = GPolygon.prototype.Bearing;