// aimsMap.js
/*
*  JavaScript template file for ArcIMS HTML Viewer
*               dependent on aimsXML.js, ArcIMSparam.js, aimsCommon.js
*/

aimsMapPresent=true;

// global variables
        // show xml responses
var debugOn = 0;
  // can debug be toggled?
var setDebug = true;

var useLimitExtent=false;
var getStartingExtent=true;
var getLimitExtent=true;
var enforceFullExtent=false;

// map extents. . . dynamically updated
var eLeft = -180.0;
var eRight = 180.0;
var eTop = 90.0;
var eBottom = -90.0;
var fullLeft = eLeft;
var fullRight = eRight;
var fullTop = eTop;
var fullBottom = eBottom;

// map size . . . dynamically updated
var iWidth = 630;
var iHeight = 512;
// location map size . . . dynamically updated
var i2Width = 150;
var i2Height = 120;

var imageLimitLeft = limitLeft;
var imageLimitTop = limitTop;
var imageLimitRight = limitRight;
var imageLimitBottom = limitBottom;

var appDir = "";

var xDistance = Math.abs(eRight-eLeft);
var yDistance = Math.abs(eTop-eBottom);
var panX = xDistance * panFactor;
var panY = yDistance * panFactor;
var pixelX = xDistance/iWidth;
var pixelY = yDistance/iHeight;
var mapX = eLeft;
var mapY = eTop;
var lastLeft = eLeft;
var lastRight = eRight;
var lastTop = eTop;
var lastBottom = eBottom;
var fullOVLeft = eLeft;
var fullOVRight = eRight;
var fullOVTop = eTop;
var fullOVBottom = eBottom;
var theCursor = "crosshair";
var canLoad=false;
//if (imsURL!="") canLoad=false;

var fullWidth = Math.abs(fullRight - fullLeft);
var fullHeight = Math.abs(fullTop - fullBottom);
var fullOVWidth = Math.abs(fullOVRight - fullOVLeft);
var fullOVHeight = Math.abs(fullOVTop - fullOVBottom);
var mapScaleFactor = xDistance / iWidth;

var geocodeX = 0;
var geocodeY = 0;
var showGeocode = false;
var geocodeLabel = "";

var queryZoom=false;

var sQuote = "'";
var dQuote = '"';

var toolMode = 1;
var legendVisible=false;
// set legend visible at service load... showTOC=false & hasTOC=true
if ((hasTOC) && (!showTOC)) legendVisible=true;

MapUnits = MapUnits.toUpperCase();
ScaleBarUnits = ScaleBarUnits.toUpperCase();

// save the extent
function saveLastExtent() {
        lastLeft = eLeft;
        lastRight = eRight;
        lastTop = eTop;
        lastBottom = eBottom;
}

// zoom out to full extent
function fullExtent() {
        if (aimsDHTMLPresent) moveLayer("theMap",hspc,vspc);
        window.scrollTo(0,0);
        saveLastExtent();
        eLeft = fullLeft;
        eRight = fullRight;
        eTop = fullTop;
        eBottom = fullBottom;
        //var theString = writeXML();
        sendMapXML();
}

function startExtent() {
        if (aimsDHTMLPresent) moveLayer("theMap",hspc,vspc);
        window.scrollTo(0,0);
        saveLastExtent();
        eLeft = startLeft;
        eRight = startRight;
        eTop = startTop;
        eBottom = startBottom;
        //var theString = writeXML();
        sendMapXML();
}

// zoom back to last extent
function zoomBack() {
        if (aimsDHTMLPresent) moveLayer("theMap",hspc,vspc);
        var left1 = eLeft;
        var right1 = eRight;
        var top1 = eTop;
        var bottom1 = eBottom;
        eLeft = lastLeft;
        eRight = lastRight;
        eTop = lastTop;
        eBottom = lastBottom;
        lastLeft = left1;
        lastRight = right1;
        lastTop = top1;
        lastBottom = bottom1;
        //var theString = writeXML();
        sendMapXML();
}

function zoomToPoint(xIn, yIn, drawIt,theLabel) {
        //alert(xIn + "," + yIn);
        var mWMargin = 0;
        var mHMargin = 0;
        //mWMargin = Math.abs(fullRight-fullLeft) * selectPointMargin;
        //mHMargin = Math.abs(fullTop-fullBottom) * selectPointMargin;
        mWMargin = Math.abs(limitRight-limitLeft) * selectPointMargin;
        mHMargin = Math.abs(limitTop-limitBottom) * selectPointMargin;
        //alert(mWMargin + "," + mHMargin);
        saveLastExtent();
        eLeft = xIn - mWMargin;
        eRight = xIn + mWMargin;
        eTop = yIn + mHMargin;
        eBottom = yIn - mHMargin;
        if (drawIt) {
                showGeocode=true;
                geocodeX=xIn;
                geocodeY=yIn;
                geocodeLabel=theLabel;
        }
        sendMapXML();
}

function zoomToEnvelope(minXin,minYin,maxXin,maxYin) {
        //alert(minXin + ", " + minYin + ", " + maxXin + ", " + maxYin)
        saveLastExtent();
        eLeft=minXin;
        eBottom=minYin;
        eRight=maxXin;
        eTop=maxYin;
        //alert("Left:" + minXin + "\nTop:" + maxYin + "\nRight:" + maxXin + "\nBottom:" + minYin);
        sendMapXML()

}

// zoom to center of fullextent at set scale
function zoomScale(inScale) {
        // inScale is scale factor where 1.0 = 100% of fullWidth and fullHeight
        var halfWidth = fullWidth / 2;
        var halfHeight = fullHeight / 2
        var midX = eRight - (xDistance / 2);
        var midY = eTop - (yDistance / 2);
        var newWidth = halfWidth * inScale;
        var newHeight = halfHeight * inScale;
        saveLastExtent();
        eLeft = midX - newWidth;
        eRight = midX + newWidth;
        eTop = midY + newHeight;
        eBottom = midY - newHeight;
        sendMapXML();

}

// get URLs and extents from URL
function getCommandLineParams(cmdString) {
        // Parse out from URL querystring parameters
        // to pass to the viewer.
        // Syntax:
        // Host=Hostmachine                                     name of Host, if not default
        // Service=MapService                           name of MapService, if not default
        // OVMap=OvMapService                           name of Overview MapService, if not default
        // Box=minX:minY:maxX:maxY                      extent to be displayed
        // Layers=0101101                                       visible layers,starting from topmost: 0=not visible;1=visible
        // ActiveLayer=layerIndex                       index of layer to be active, if not default
        // Query=queryExpression                        query expression to be send on load - expression must be escaped in URL
        // QueryZoom=Yes                                        zoom to above query?
        // StartLeft,StartTop,
        // StartRight,StartBottom                       starting coords - alternative to Box
        // LimitLeft,LimitTop,
        // LimitRight,LimitBottom                       limit coords
        //
        //
        setLayerVisible.length=0;
        var cmdString2 = cmdString.toUpperCase();
        var startpos = 0;
        var endpos = 0;
        var pos = cmdString2.indexOf("HOST=");
        if (pos!=-1) {
                startpos = pos + 5;
                endpos = cmdString.indexOf("&",startpos);
                if (endpos==-1) endpos = cmdString.length;
                hostName = cmdString.substring(startpos,endpos);
                serverURL  = "http://" + hostName + "/servlet/com.esri.esrimap.Esrimap?ServiceName=";
        }
        pos = cmdString2.indexOf("SERVICE="); // formally was MAPSERVICE=
        if (pos!=-1) {
                startpos = pos + 8;
                endpos = cmdString.indexOf("&",startpos);
                if (endpos==-1) endpos = cmdString.length;
                imsURL = serverURL + cmdString.substring(startpos,endpos);
        }
        pos = cmdString2.indexOf("OVMAP="); // formally was OVMAPSERVICE=
        if (pos!=-1) {
                startpos = pos + 6;
                endpos = cmdString.indexOf("&",startpos);
                if (endpos==-1) endpos = cmdString.length;
                imsOVURL = serverURL + cmdString.substring(startpos,endpos);
        }
        pos = cmdString2.indexOf("BOX=");
        if (pos!=-1) {
                startpos = pos + 4;
                endpos = cmdString.indexOf("&",startpos);
                if (endpos==-1) endpos = cmdString.length;
                var boxString = cmdString.substring(startpos,endpos);
                //alert(boxString);
                var xyBox = boxString.split(":");
                if (xyBox.length==4) {
                        startLeft = parseFloat(xyBox[0]);
                        startBottom = parseFloat(xyBox[1]);
                        startRight = parseFloat(xyBox[2]);
                        startTop = parseFloat(xyBox[3]);
                        eLeft=startLeft;
                        eBottom=startBottom;
                        eRight=startRight;
                        eTop = startTop;
                }
                //xyBox=null;
        }
        pos = cmdString2.indexOf("MAXRECT=");
        if (pos!=-1) {
                startpos = pos + 8;
                endpos = cmdString.indexOf("&",startpos);
                if (endpos==-1) endpos = cmdString.length;
                var boxString = cmdString.substring(startpos,endpos);
                //alert(boxString);
                var xyBox = boxString.split(":");
                if (xyBox.length==4) {
                        limitLeft = xyBox[0];
                        limitBottom = xyBox[1];
                        limitRight = xyBox[2];
                        limitTop = xyBox[3];
                }
                //xyBox=null;
        }
        if (aimsLayersPresent) {
                // you need to have aimsLayers.js loaded
                pos = cmdString2.indexOf("LAYERS=");
                if (pos!=-1) {
                        startpos = pos + 7;
                        endpos = cmdString.indexOf("&",startpos);
                        if (endpos==-1) endpos = cmdString.length;
                        var layers = cmdString.substring(startpos,endpos);
                        //"0" means the layer should be turned off, and "1" means
                        //the layer should be visible.  For example, "1001" means there
                        //are 4 layers.  The first and last layer are visible, and the
                        //middle two layers are turned off. The first number represents
                        //the top-most layer.

                        //Parse the layers string
                        var numLayers=layers.length;
                        icount=0;
                        //alert(layers);
                        while (icount<=numLayers-1) {
                          onoff=layers.substring(icount,icount+1);
                          if (onoff=='0') {
                                setLayerVisible[icount]=false;
                          }
                          else if (onoff=='1') {
                            setLayerVisible[icount]=true;
                          }
                          icount=icount+1;
                        }
                        layers="";
                }

                pos = cmdString2.indexOf("ACTIVELAYER=");
                if (pos!=-1) {
                        startpos = pos + 12;
                        endpos = cmdString.indexOf("&",startpos);
                        if (endpos==-1) endpos = cmdString.length;
                        var actlyr = cmdString.substring(startpos,endpos);
                        //alert(actlyr);
                        ActiveLayerIndex = parseInt(actlyr);
                        selectType = LayerType[ActiveLayerIndex];
                        actlyr = "";
                }
                if (aimsQueryPresent) {
                        // you need to have aimsQuery.js loaded
                        pos = cmdString2.indexOf("QUERY=");
                        if (pos!=-1) {
                                startpos = pos + 6;
                                endpos = cmdString.indexOf("&",startpos);
                                if (endpos==-1) endpos = cmdString.length;
                                var escQuery = cmdString.substring(startpos,endpos);
                                escQuery = replacePlus(escQuery);
                                escQuery = unescape(escQuery);
                                highlightedOne = makeXMLsafe(escQuery);
                                escQuery="";
                        }
                        if (highlightedOne!="") {
                                pos = cmdString2.indexOf("QUERYZOOM=YES");
                                if (pos!=-1) queryZoom = true;
                        }
                }
        }

        pos = cmdString2.indexOf("STARTLEFT=");
        if (pos!=-1) {
                startpos = pos + 10;
                endpos = cmdString.indexOf("&",startpos);
                if (endpos==-1) endpos = cmdString.length;
                startLeft = cmdString.substring(startpos,endpos);
        }
        pos = cmdString2.indexOf("STARTTOP=");
        if (pos!=-1) {
                startpos = pos + 9;
                endpos = cmdString.indexOf("&",startpos);
                if (endpos==-1) endpos = cmdString.length;
                startTop = cmdString.substring(startpos,endpos);
        }
        pos = cmdString2.indexOf("STARTRIGHT=");
        if (pos!=-1) {
                startpos = pos + 11;
                endpos = cmdString.indexOf("&",startpos);
                if (endpos==-1) endpos = cmdString.length;
                startRight = cmdString.substring(startpos,endpos);
        }
        pos = cmdString2.indexOf("STARTBOTTOM=");
        if (pos!=-1) {
                startpos = pos + 12;
                endpos = cmdString.indexOf("&",startpos);
                if (endpos==-1) endpos = cmdString.length;
                startBottom = cmdString.substring(startpos,endpos);
        }
        pos = cmdString2.indexOf("LIMITLEFT=");
        if (pos!=-1) {
                startpos = pos + 10;
                endpos = cmdString.indexOf("&",startpos);
                if (endpos==-1) endpos = cmdString.length;
                limitLeft = cmdString.substring(startpos,endpos);
        }
        pos = cmdString2.indexOf("LIMITTOP=");
        if (pos!=-1) {
                startpos = pos + 9;
                endpos = cmdString.indexOf("&",startpos);
                if (endpos==-1) endpos = cmdString.length;
                limitTop = cmdString.substring(startpos,endpos);
        }
        pos = cmdString2.indexOf("LIMITRIGHT=");
        if (pos!=-1) {
                startpos = pos + 11;
                endpos = cmdString.indexOf("&",startpos);
                if (endpos==-1) endpos = cmdString.length;
                limitRight = cmdString.substring(startpos,endpos);
        }
        pos = cmdString2.indexOf("LIMITBOTTOM=");
        if (pos!=-1) {
                startpos = pos + 12;
                endpos = cmdString.indexOf("&",startpos);
                if (endpos==-1) endpos = cmdString.length;
                limitBottom = cmdString.substring(startpos,endpos);
        }
        pos = cmdString2.indexOf("EXTENT=AUTO");
        if (pos!=-1) {
                startLeft=0;
                startRight=0;
                startTop=0;
                startBottom=0;
                limitLeft=0;
                limitRight=0;
                limitTop=0;
                limitBottom=0;
                getStartingExtent=true;
                getLimitExtent=true;
        }

        //alert("imsURL=" + imsURL + "\nimsOVURL=" + imsOVURL);
        if (imsURL!="") {
                imsQueryURL= imsURL + "&CustomService=Query";
                imsGeocodeURL = imsURL + "&CustomService=Geocode";
                //canLoad=false;
        }
        // if starting extents zero'd then flag to get start from mapservice
        if ((startLeft!=0) && (startRight!=0)) getStartingExtent=false;
        // if limit extents zero'd then flag to get max from mapservice
        if ((limitLeft!=0) && (limitRight!=0)) {
                getLimitExtent=false;
                enforceFullExtent=true;
        }
}

// get directory path of URL
function getPath(theFullPath) {
        var theSlash = theFullPath.lastIndexOf("/");
        var theDir = theFullPath.substring(0,theSlash);
        if (theDir==null) theDir="";
        theDir = theDir + "/";
        return theDir;

}

// check for existance of layer
function hasLayer(name) {
        var result = false;
        if (isNav4) {
                if (document.layers[name]!=null) result=true;
        }  else if (isIE) {
                if (eval('document.all.' + name)!=null) result=true;
        } else if (isNav) {
                var theElements = document.getElementsByTagName("DIV");
                var theObj;
                var j = -1;
                for (i=0;i<theElements.length;i++) {
                        if (theElements[i].id==name) result=true;
                }
    }
        return result;
}

// put up the "RetriveData" image
function showRetrieveData() {
        if (hasLayer("LoadData")) {
                showLayer("LoadData");
        }
}

// hide the "RetriveData" image
function hideRetrieveData() {
        if (hasLayer("LoadData")) {
                hideLayer("LoadData");
        }
}

// put up the "RetriveMap" image
function showRetrieveMap() {
        if (hasLayer("LoadMap")) {
                showLayer("LoadMap");
        }
}

// hide the "RetriveMap" image
function hideRetrieveMap() {
        if (hasLayer("LoadMap")) {
                hideLayer("LoadMap");
        }
}

/*  *****************************************************
*       Various Distance Conversion Functions
*       *****************************************************
*/

// get scale bar distance
function getScaleBarDistance() {
        // get distance from left and right values in map units
        // convert to ScaleBar units then clip to ScaleBar size

        // Note: decimal are not hard coded to allow use with locales using commas instead of points.
        var mUnits = MapUnits;
        var mDistance = eRight - eLeft;
        var sbDistance = 0
        if (MapUnits=="DEGREES") {
                // if DEGREES then convert to feet
                        // first get mid y point
                var midY = eBottom + (eTop-eBottom)/2;
                var tempL = eLeft;
                var tempR = eRight;
                if (tempL<-180) tempL = (-1799999 /10000);
                if (tempR>180) tempL = (1799999/10000);
                var Lon1 = tempL * Math.PI / 180;
                var Lon2 = tempR * Math.PI / 180;
                var Lat1 = midY * Math.PI / 180;
                var Lat2 = midY * Math.PI / 180;
                var LonDist = Math.abs(Lon2-Lon1);
                var LatDist = Math.abs(Lat1-Lat2);
                var A = Math.pow(Math.sin(LatDist / 2),2) + Math.cos(Lat1) * Math.cos(Lat2) * Math.pow(Math.sin(LonDist /2),2);
                //var A = Math.cos(Lat1) * Math.cos(Lat2) * Math.pow(Math.sin(LonDist /2),2);
                var C = 2 * Math.asin(Math.min(1, Math.sqrt(A)));
                var D = (3963 - 13 * Math.sin((Lat1 + Lat2) / 2)) * C

                mDistance = D * 5280;
                mUnits = "FEET";
        }
        if (mUnits != ScaleBarUnits) {
                theDist = mDistance
                mDistance = convertUnits(theDist,mUnits,ScaleBarUnits);
        }

        sbDistance = mDistance/5;
        // /*
        var num1 = 0;
        var num2 = sbDistance;
        if (sbDistance>10000000) {
                num1 = parseInt(sbDistance/5000000);
                num2 = num1 * 5000000;
        } else if (sbDistance>1000000) {
                num1 = parseInt(sbDistance/500000);
                num2 = num1 * 500000;
        } else if (sbDistance>100000) {
                num1 = parseInt(sbDistance/50000);
                num2 = num1 * 50000;
        } else if (sbDistance>10000) {
                num1 = parseInt(sbDistance/5000);
                num2 = num1 * 5000;
        } else if (sbDistance>1000) {
                num1 = parseInt(sbDistance/500);
                num2 = num1 * 500;
        } else if (sbDistance>100) {
                num1 = parseInt(sbDistance/50);
                num2 = num1 * 50;
        } else if (sbDistance>10) {
                num1 = parseInt(sbDistance/5);
                num2 = num1 * 5;
        } else if (sbDistance>1) {
                num1 = parseInt(sbDistance/(25/100));
                num2 = num1 * (25/100);
        } else if (sbDistance>0.1) {
                num1 = parseInt(sbDistance/(25/1000));
                num2 = num1 * (25/1000);
        }
        sbDistance = num2;
        // */
        if (sbDistance > 2) {
                ScaleBarPrecision = "0";
        } else if (sbDistance > 1) {
                ScaleBarPrecision = "1";
        } else if (sbDistance > 1/10) {
                ScaleBarPrecision = "2";
        } else if (sbDistance > 1/100) {
                ScaleBarPrecision = "3";
        } else {
                ScaleBarPrecision = "4";
        }

        //alert(mDistance);
        return sbDistance;
}

// calculate distance to current scalebarunits
function calcDistance(mX,mY) {
        // Note: decimal are not hard coded to allow use with locales using commas instead of points.
        if (clickCount>0) {
                var mUnits = MapUnits;
                var mDistance = 0;
                var p = clickCount-1;
                var Lon1 = clickPointX[p] * Math.PI / 180;
                var Lon2 = mX * Math.PI / 180;
                var Lat1 = clickPointY[p] * Math.PI / 180;
                var Lat2 = mY * Math.PI / 180;
                //var LonDist = Math.abs(Lon1-Lon2);
                //var LatDist = Math.abs(Lat1-Lat2);
                var LonDist = Lon1-Lon2;
                var LatDist = Lat1-Lat2;
                if (MapUnits=="DEGREES") {
                        //var Lon1 = clickPointX[p] * Math.PI / 180;
                        //var Lon2 = mX * Math.PI / 180;
                        //var Lat1 = clickPointY[p] * Math.PI / 180;
                        //var Lat2 = mY * Math.PI / 180;
                        //var LonDist = Math.abs(Lon1-Lon2);
                        //var LatDist = Math.abs(Lat1-Lat2);
                        var A = Math.pow(Math.sin(LatDist / 2),2) + Math.cos(Lat1) * Math.cos(Lat2) * Math.pow(Math.sin(LonDist /2),2);
                        //var A = Math.cos(Lat1) * Math.cos(Lat2) * Math.pow(Math.sin(LonDist /2),2);
                        var C = 2 * Math.asin(Math.min(1, Math.sqrt(A)));
                        var D = (3963 - 13 * Math.sin((Lat1 + Lat2) / 2)) * C
                        mDistance = D * 5280;
                        mUnits = "FEET";
                } else {
                        var xD = Math.abs(mX - clickPointX[p]);
                        var yD = Math.abs(mY - clickPointY[p]);
                        mDistance = Math.sqrt(Math.pow(xD,2) + Math.pow(yD,2));
                }

                var theDist = convertUnits(mDistance,mUnits,ScaleBarUnits);
                var u = Math.pow(10,numDecimals);
                currentMeasure = parseInt(theDist*u+(5/10))/u;

                updateMeasureBox();

        }
}

// convert the amounts to new units
function convertUnits(theDist1,mUnits,sUnits) {
        // Note: decimal are not hard coded to allow use with locales using commas instead of points.
        var theDist = parseFloat(theDist1);
        var mDistance = theDist;
        //alert(theDist);
        if (mUnits == "FEET") {
                if (sUnits=="MILES") {
                        mDistance = theDist / 5280;
                } else if (sUnits == "METERS") {
                        mDistance = theDist * (3048/10000);
                } else if (sUnits == "KILOMETERS") {
                        mDistance = theDist * (3048/10000000);
                }
        } else {
                if (sUnits=="MILES") {
                        mDistance = theDist * (6213711922/10000000000000);
                } else if (sUnits == "FEET") {
                        mDistance = theDist * (3280839895/1000000000);
                } else if (sUnits == "KILOMETERS") {
                        mDistance = theDist / 1000;
                }
        }
        var u = Math.pow(10,numDecimals);
        //alert(u);
        if (!isNav) mDistance = parseInt(mDistance * u + (5/10)) / u
        //alert(mDistance);
        return mDistance;
}

// set new map extent
function setExtent(newLeft, newTop, newRight, newBottom) {
        eLeft = newLeft;
        eTop = newTop;
        eRight = newRight;
        eBottom = newBottom;
}

//  set new full extent
function setFullExtent(maxLeft, maxTop, maxRight, maxBottom) {
        fullLeft = maxLeft;
        fullTop = maxTop;
        fullRight = maxRight;
        fullBottom = maxBottom;
        fullWidth = Math.abs(fullRight-fullLeft);
        fullHeight = Math.abs(fullTop-fullBottom);
}

function beforeMapRefresh() {
  // Call actually goes to MapFrame.htm->beforeMapRefresh()
}

function afterMapRefresh() {
  // Call actually goes to MapFrame.htm->afterMapRefresh()
}

// zoom using button.
//              zoomType: 1=in; 2=out
function zoomButton(zoomType) {
        saveLastExtent();
        if (zoomType == 1) {
                // zoom in
                eLeft = eLeft + (xHalf/2);
                eRight = eRight - (xHalf/2);
                eTop = eTop - (yHalf/2);
                eBottom = eBottom + (yHalf/2);
        }
        else {
                // zoom out
                eLeft = eLeft - xHalf;
                eRight = eRight + xHalf;
                eTop = eTop + yHalf;
                eBottom = eBottom - yHalf;
        }
        checkFullExtent();
        //var theString = writeXML();
        sendMapXML();
}

// pan using arrow buttons
function panButton(panType) {
        //alert("Left:" + left + "\nTop:" + top + "\nRight:" + right + "\nBottom:" + bottom + "\nWidth:" + xDistance + "\nHeight:" + yDistance + "\nPanX:" + panX + "\nPanY:" + panY);
        saveLastExtent();
        xDistance = Math.abs(eRight-eLeft);
        yDistance = Math.abs(eTop-eBottom);
        panX = xDistance * panFactor;
        panY = yDistance * panFactor;
        switch(panType) {
        //if (panType == 1) {
        case 1:
                //west
                eLeft = eLeft - panX;
                eRight = eLeft + xDistance;
                break
        case 2:
                // north
                eTop = eTop + panY;
                eBottom = eTop - yDistance;
                break
        case 3:
                // east
                eRight = eRight + panX;
                eLeft = eRight - xDistance;
                break
        case 4:
                // south
                eBottom = eBottom - panY;
                eTop = eBottom + yDistance;
                break
        case 5:
                // southwest
                eTop = eTop - panY;
                eLeft = eLeft - panX;
                eBottom = eTop - yDistance;
                eRight = eLeft + xDistance;
                break
        case 6:
                // northwest
                eTop = eTop + panY;
                eLeft = eLeft - panX;
                eBottom = eTop - yDistance;
                eRight = eLeft + xDistance;
                break
        case 7:
                // northeast
                eTop = eTop + panY;
                eLeft = eLeft + panX;
                eBottom = eTop - yDistance;
                eRight = eLeft + xDistance;
                break
        case 8:
                // southeast
                eTop = eTop - panY;
                eLeft = eLeft + panX;
                eBottom = eTop - yDistance;
                eRight = eLeft + xDistance;
        }
        checkFullExtent();
        //alert("Left:" + left + "\nTop:" + top + "\nRight:" + right + "\nBottom:" + bottom + "\nWidth:" + xDistance + "\nHeight:" + yDistance + "\nPanX:" + panX + "\nPanY:" + panY);
        //var theString = writeXML();
        sendMapXML();

}

function checkFullExtent() {
        if (xDistance>fullWidth) xDistance = fullWidth;
        if (yDistance>fullHeight) yDistance = fullHeight;
        if (enforceFullExtent) {
                if (eLeft < limitLeft) {
                        eLeft = limitLeft;
                        eRight = eLeft + xDistance;
                }
                if (eTop > imageLimitTop) {
                        eTop = imageLimitTop;
                        eBottom = eTop - yDistance;
                }
                if (eRight > imageLimitRight) {
                        eRight = imageLimitRight;
                        eLeft = eRight - xDistance;
                }
                if (eBottom < imageLimitBottom) {
                        eBottom = imageLimitBottom;
                        eTop = eBottom + yDistance;
                }
        }

}