And applied it to the ASP.NET control I've already blogged about here - from Jeevan Murkoth on this address - http://dotnet.sys-con.com/node/171162
Basically I added to the GMapControl class:
private string _sBoundingBox = string.Empty;
/// <summary>
/// Method to Center and Zoom the map around a bounding box
/// </summary>
/// <param name="swPoint">Point at which the map should be South West</param>
/// <param name="nePoint">Point at which the map should be North East</param>
public void CenterAndZoomUsingBoundingBox(GPoint swPoint, GPoint nePoint)
{
StringBuilder boundingBuilder = new StringBuilder();
boundingBuilder.AppendFormat("var sw{2}=new GLatLng({0},{1});", swPoint.Longitude, swPoint.Latitude, this.ClientID);
boundingBuilder.AppendFormat("var ne{2}=new GLatLng({0},{1});", nePoint.Longitude, nePoint.Latitude, this.ClientID);
boundingBuilder.AppendFormat("var bounds{0}=new GLatLngBounds(sw{0},ne{0});", this.ClientID);
_sBoundingBox = boundingBuilder.ToString();
_sZoomAndCenter = string.Empty;
}
And I modified these GMapControl methods:
/// <summary>
/// Method to Center and Zoom the map at a particular point
/// </summary>
/// <param name="curPoint">Point at which the map should be centered</param>
/// <param name="ZoomLevel">Zoom level</param>
public void CenterAndZoom(GPoint curPoint, int ZoomLevel)
{
_sZoomAndCenter = string.Format("ZoomIn{3}({0},{1},{2});", curPoint.Longitude, curPoint.Latitude, ZoomLevel, this.ClientID);
_sBoundingBox = string.Empty;
}
/// <summary>
/// Method that Generates all the Javascript
/// </summary>
/// <returns>Javascript code as a string</returns>
private string InitializeMap()
{
//This is a work around for the thread abort error in IE
//IE doesn't seem to like script tags in the body so close the form and
//open another form element
_sInitFunction.Append("</form>");
_sInitFunction.Append("<script language='javascript'>\n");
//Check if the Browser is compatible
_sInitFunction.Append("if(GBrowserIsCompatible()){\n");
_sInitFunction.AppendFormat("var {0};", _sGMapVariable);
_sInitFunction.AppendFormat("var {0}= new Array();", _sArrayVariable);
_sInitFunction.AppendFormat("{0}\n", myScriptGenerator.GenerateNewOverLayFunction());
// If pop windows are to be shown then the enable drag has to be set to true
if (_bOverrideEnabledrag)
_bEnabledrag = true;
_sInitFunction.AppendFormat("{0}\n", myScriptGenerator.GenerateGMapVariableInitialization(_sGMapVariable, this.ClientID, _bEnabledrag, _bEnableInfoWindow, _bEnableMapTypeControl));
_sInitFunction.AppendFormat("{0}\n", myScriptGenerator.GenerateMapType(_MapType, _sGMapVariable));
_sInitFunction.AppendFormat("{0}\n", myScriptGenerator.GenerateScrollControl(_MapScrollType, _sGMapVariable));
_sInitFunction.AppendFormat("{0}\n", _sPointOverlay.ToString());
_sInitFunction.AppendFormat("{0}\n", _sLineOverlay.ToString());
_sInitFunction.AppendFormat("{0}\n", _sBoundingBox);
if (_sBoundingBox.Trim().Length > 0)
_sInitFunction.AppendFormat("{0}.centerAndZoom(bounds{1}.getCenter(),{0}.getBoundsZoomLevel(bounds{1}));", _sGMapVariable, this.ClientID);
_sInitFunction.AppendFormat("{0}\n", _sZoomAndCenter);
_sInitFunction.AppendFormat("{0}.addOverlays({1});\n", _sGMapVariable, _sArrayVariable);
_sInitFunction.Append("}\n");
//Render the function only if needed.This reduces the client side Javascript rendered
if (_sZoomAndCenter.Trim().Length > 0)
_sInitFunction.AppendFormat("{0}\n", myScriptGenerator.GenerateZoomInFunction(_sGMapVariable, this.ClientID));
if (_sPointOverlay.Length > 0)
{
_sInitFunction.AppendFormat("{0}\n", myScriptGenerator.GenerateOverLayPointFuncCall(_sArrayVariable, this.ClientID));
_sInitFunction.AppendFormat("{0}\n", myScriptGenerator.GenerateCustomOverLayPointFuncCall(_sArrayVariable, this.ClientID));
}
//Render the function only if needed.This reduces the client side Javascript rendered
if (_sLineOverlay.Length > 0)
_sInitFunction.AppendFormat("{0}\n", myScriptGenerator.GenerateOverlayLineFuncCall(_sArrayVariable, this.ClientID));
_sInitFunction.Append("</script>\n");
_sInitFunction.Append("<form>");
return _sInitFunction.ToString();
}
And in I modified these JScriptGenerator methods:
/// <summary>
/// Method that generates JavaScript code to Initialize the map Variable
/// </summary>
/// <param name="sGMapVariable">Variable representing the map</param>
/// <param name="sClientID">Client ID of the control</param>
/// <param name="bEnableDrag">Set if the map can be dragged</param>
/// <param name="bEnableInfoWindow">set if there can be pop up windows on the map</param>
/// <param name="bEnableMapTypeControl">set if the map Type can be changed</param>
/// <returns>JavaScript code as string</returns>
public string GenerateGMapVariableInitialization(string sGMapVariable, string sClientID,bool bEnableDrag,bool bEnableInfoWindow, bool bEnableMapTypeControl)
{
StringBuilder sInitVarBuilder= new StringBuilder();
sInitVarBuilder.AppendFormat("{1} =new GMap2(document.getElementById('{0}'));\n",sClientID,sGMapVariable);
if(!bEnableDrag)
sInitVarBuilder.AppendFormat("{0}.disableDragging() ;\n",sGMapVariable);
if(!bEnableInfoWindow)
sInitVarBuilder.AppendFormat("{0}.disableInfoWindow() ;\n",sGMapVariable);
if( bEnableMapTypeControl)
sInitVarBuilder.AppendFormat("{0}.addControl(new GMapTypeControl()) ;\n",sGMapVariable);
return sInitVarBuilder.ToString();
}
/// <summary>
/// Method to generate the Javascript function to center and Zoom in
/// at a point on a map
/// </summary>
/// <param name="sGMapVariable">Variable representing the map</param>
/// <param name="sClientID">Client ID of the control</param>
/// <returns>JavaScript function as a string</returns>
///<code>
/// function ZoomIn(clong,cLat,ZoomLevel)
/// {
/// map.centerAndZoom(new GPoint(clong,cLat), ZoomLevel);
/// }
/// </code>
public string GenerateZoomInFunction(string sGMapVariable ,string sClientID)
{
StringBuilder sZoomInFunction = new StringBuilder();
//Generate a unique Name for the function
sZoomInFunction.AppendFormat("function ZoomIn{0}(clong,cLat,ZoomLevel)",sClientID);
sZoomInFunction.Append("\n{");
sZoomInFunction.AppendFormat("{0}.setCenter(new GPoint(clong,cLat),ZoomLevel)", sGMapVariable);
sZoomInFunction.Append("\n; }");
return sZoomInFunction.ToString();
}
/// <summary>
/// Method to Overlay points on the map
/// Instead of overlaying each point or lay individually
/// it stores them in an array and overlays them together
/// </summary>
/// <returns>JavaScript code as string</returns>
public string GenerateNewOverLayFunction()
{
// The credit for the method goes to Lokkju and is available
// on the google group for Google Maps
StringBuilder sOverLayFunction = new StringBuilder();
sOverLayFunction.Append("GMap2.prototype.addOverlays=function(a)\n");
sOverLayFunction.Append("{ var b=this;\n ");
sOverLayFunction.Append(" for (i=0;i<a.length;i++)\n");
sOverLayFunction.Append("{\n");
// SL - changed
//sOverLayFunction.Append("try{this.overlays.push(a[i]); \n");
sOverLayFunction.Append("try{this.addOverlay(a[i]); \n");
sOverLayFunction.Append("a[i].initialize(this);\n");
sOverLayFunction.Append(" a[i].redraw(true);\n");
sOverLayFunction.Append(" }catch(er){}\n");
// SL - changed
//sOverLayFunction.Append("} this.reOrderOverlays();}; ");
sOverLayFunction.Append("} }; ");
return sOverLayFunction.ToString();
}
This was a lot more involved than I expected - all part of the shift from GMaps version 1 to version 2 and I've no idea what I've broken now....
