aimsselect.js

用ARCIMS在客户端框选一块区域求面积。

// aimsSelect.js
/*
*  JavaScript template file for ArcIMS HTML Viewer
*		dependent on aimsXML.js, ArcIMSparam.js, aimsCommon.js, aimsMap.js, aimsIdentify, and aimsLayers.js
*		To be interactive, dependent also on aimsDHTML.js, aimsClick.js, and aimsNavigation.js
*/

aimsSelectPresent=true;

var selectData = new Array();
var selectLeft = new Array();
var selectRight = new Array();
var selectTop = new Array();
var selectBottom = new Array();
var selMaxEnvelope = new Array();

var selectLayer="";
var selectType = "";
var selectCount = 0;
var selectBlurb = "";
var selectEnvelope="";
var highlightedOne = "";
	//mode - 0=selection; 1=query
var queryMode=1;
	//mode - 1=query; 2=box,point; 3=line,polygon
var selectionMode=1;
var setQueryString="";

var shapeBufferDistance = 0;


/*
***************************************************************************************

Selection functions 

***************************************************************************************
*/

// select feature
function select(e) {

	//getImageXY(e);
	getMapXY(mouseX,mouseY);
	searchTolerance = (xDistance/iWidth) * pixelTolerance;
	var tempWest = mapX - searchTolerance;
	var tempNorth = mapY + searchTolerance;
	var tempEast = mapX + searchTolerance;
	var tempSouth = mapY - searchTolerance;
	queryStartRecord=1;
	selectEnvelope='maxy="' + forceComma(tempNorth) + '" maxx="' + forceComma(tempEast) + '" miny="' + forceComma(tempSouth) + '" minx="' + forceComma(tempWest) + '"';
	selectionMode=2;
	showRetrieveData();
	var theString = writeGetFeatures2(tempWest,tempSouth,tempEast,tempNorth);
	sendToServer(imsQueryURL,theString,selectXMLMode);
}

// start select box display
function startSelectBox(e) {
	if (checkIfActiveLayerAvailable()) {
		moveLayer("theMap",hspc,vspc);
		getImageXY(e);
		// keep it within the MapImage
		if ((mouseX<iWidth) && (mouseY<iHeight)) {
			if (selectBox) {
				stopSelectBox(e);
			} else {
				x1=mouseX;
				y1=mouseY
				x2=x1+1;
				y2=y1+1;
				zleft=x1;
				ztop=y1;
				zbottom=y1;
				zright=x1
				boxIt(x1,y1,x2,y2);
				/*
				clipLayer("zoomBoxTop",x1,y1,x2,y2);
				clipLayer("zoomBoxLeft",x1,y1,x2,y2);
				clipLayer("zoomBoxRight",x1,y1,x2,y2);
				clipLayer("zoomBoxBottom",x1,y1,x2,y2);
				*/
				selectBox=true;
				
				//if (isNav4) {
					showLayer("zoomBoxTop");
					showLayer("zoomBoxLeft");
					showLayer("zoomBoxRight");
					showLayer("zoomBoxBottom");
				//} else {
				//	showLayer("zoomBox");
				//}
			}
			highlightedOne="";
		}
		return false;
	}

}

// stop select box display..... select
function stopSelectBox(e) {
	selectBox=false;
	/*
	var tempLeft=lastLeft;
	var tempRight=lastRight;
	var tempTop=lastTop;
	var tempBottom=lastBottom;
	*/
	//if (isNav4) {
		hideLayer("zoomBoxTop");
		hideLayer("zoomBoxLeft");
		hideLayer("zoomBoxRight");
		hideLayer("zoomBoxBottom");
	//} else {
	//	showLayer("zoomBox");
	//}
	// /*
	if ((zright <zleft+2) && (zbottom < ztop+2)) {
		
		//getMapXY(mouseX-pixelTolerance,mouseY-pixelTolerance);
		getMapXY(mouseX,mouseY);
		searchTolerance = (xDistance/iWidth) * pixelTolerance;
		tempLeft = mapX-searchTolerance;
		tempTop = mapY-searchTolerance;
		tempRight = mapX+searchTolerance;
		tempBottom = mapY+searchTolerance;
		
		//select(e);
	} else {
	// */	
		pixelX = xDistance / iWidth;
		var theY = iHeight - ztop;
		pixelY = yDistance / iHeight;
		tempTop = pixelY * theY + eBottom;
		tempRight = pixelX * zright + eLeft;
		tempLeft = pixelX * zleft + eLeft;
		theY = iHeight - zbottom;
		pixelY = yDistance / iHeight;
		tempBottom = pixelY * theY + eBottom;
	}
		window.scrollTo(0,0);
	
	queryStartRecord=1;
	var theString = writeGetFeatures2(tempLeft,tempBottom,tempRight,tempTop);
	selectEnvelope='maxy="' + forceComma(tempTop) + '" maxx="' + forceComma(tempRight) + '" miny="' + forceComma(tempBottom) + '" minx="' + forceComma(tempLeft) + '"';
	drawSelectBoundary=true;
	showBuffer=false;
	selectionMode=2;
	//if (useTextFrame) parent.TextFrame.document.location = "text.htm";
	sendToServer(imsQueryURL,theString,selectXMLMode);
	return true;

}

// write out XML request to select features
function writeGetFeatures2(west1,south1,east1,north1) {
	if (swapSelectFields) {
		selectFields=selFieldList[ActiveLayerIndex];
		//alert(selectFields);
	}
	var theEnvelope = 'maxy="' + forceComma(north1) + '" maxx="' + forceComma(east1) + '" miny="' + forceComma(south1) + '" minx="' + forceComma(west1 )+ '"';
	var theString = writeEnvelopeXML(ActiveLayer,ActiveLayerType,selectFields,maxFeaturesReturned,queryStartRecord,theEnvelope,useLimitExtent);
	//alert(theString);
	selectLayer=ActiveLayer;
	selectType=ActiveLayerType;
	selectCount=0;
	hightlightedOne="";
	selectPoints.length=1;
	selectLeft.length=1;
	selectRight.length=1;
	selectTop.length=1;
	selectBottom.length=1;
	return theString;
}

function writeGetFeatures3() {
	if (swapSelectFields) {
		selectFields=selFieldList[ActiveLayerIndex];
	}
	var theString = writeEnvelopeXML(ActiveLayer,ActiveLayerType,selectFields,maxFeaturesReturned,queryStartRecord,selectEnvelope,useLimitExtent);
	//alert(theString);
	selectLayer=ActiveLayer;
	selectType=ActiveLayerType;
	selectCount=0;
	hightlightedOne="";
	selectPoints.length=1;
	selectLeft.length=1;
	selectRight.length=1;
	selectTop.length=1;
	selectBottom.length=1;
	return theString;
}

// generic envelope select xml write routine
function writeEnvelopeXML(theLayer,theLayerType,theFields,maxReturned,startRec,theEnvelope,hasLimit) {
	var theString = '<ARCXML version="1.1">\n<REQUEST>\n<GET_FEATURES outputmode="xml" envelope="true" geometry="false"';
	theString += ' featurelimit="' + maxReturned + '" beginrecord="' + startRec + '">\n';
	theString += '<LAYER id="' + theLayer + '" />';
	theString += '<SPATIALQUERY subfields="' + theFields + '">';
	//theString += '<SPATIALFILTER relation=envelope_intersection >';
	theString += '<SPATIALFILTER relation="area_intersection" >';
	theString += '<ENVELOPE ' + theEnvelope + ' />';
	theString += '</SPATIALFILTER>';
	if (hasLimit) {
		// keep this within the limitExtent
		theString += '<SPATIALFILTER relation="area_intersection">\n';
		theString += '<ENVELOPE maxx="' + forceComma(limitRight) + '" maxy="' + forceComma(limitTop) + '" minx="' + forceComma(limitLeft) + '" miny="' + forceComma(limitBottom) + '" />\n';
		theString += '</SPATIALFILTER>\n';
	}
	theString += '</SPATIALQUERY>';
	theString += '</GET_FEATURES>';
	theString += '</REQUEST>';
	theString += '</ARCXML>';
	return theString;

}

// write out xml request for selection by shape
function writeShapeSelect(theType) {
	if (swapSelectFields) {
		selectFields=selFieldList[ActiveLayerIndex];
	}
	var theString = '<ARCXML version="1.1">\n<REQUEST>\n<GET_FEATURES outputmode="xml" envelope="true" geometry="false"';
	theString += ' featurelimit="' + maxFeaturesReturned + '" beginrecord="' + queryStartRecord + '">\n';
	theString += '<LAYER id="' + ActiveLayer + '" />';
	theString += '<SPATIALQUERY subfields="' + selectFields + '">';
	theString += '<SPATIALFILTER relation="area_intersection" >';
	if ((shapeSelectBuffer) && (shapeBufferDistance>0)) {
	//if (shapeBufferDistance>0) {
		// do a buffer around the shape before selecting
		
		theString += '<BUFFER distance="' + forceComma(shapeBufferDistance) + '" ';
		
		theString += ' bufferunits="' + ScaleBarUnits + '"';
		theString += ' />\n';
	}
	if (theType==1) {
		theString += '<POLYLINE>\n<PATH>\n';
	} else if (theType==2) {
		theString += '<POLYGON>\n<RING>\n';
	} else {
		theString += '<MULTIPOINT>\n';
	}
	if (theType==0) {
		theString += '<POINT x="' + clickPointX[clickCount-1] + '" y="' + clickPointY[clickCount-1] + '" />\n';
	} else {
		for (var i=0;i<clickCount;i++) {
			theString += '<POINT x="' + clickPointX[i] + '" y="' + clickPointY[i] + '" />\n'; 
		}
	}
	if (theType==0) {
		theString += '</MULTIPOINT>\n';
	} else if (theType==2) {
		theString += '</RING>\n</POLYGON>\n';
	} else {
		theString += '</PATH>\n</POLYLINE>\n';
	}
	theString += '</SPATIALFILTER>';
	if (useLimitExtent) {
		// keep this within the limitExtent
		theString += '<SPATIALFILTER relation="area_intersection">\n';
		theString += '<ENVELOPE maxx="' + forceComma(limitRight) + '" maxy="' + forceComma(limitTop) + '" minx="' + forceComma(limitLeft) + '" miny="' + forceComma(limitBottom) + '" />\n';
		theString += '</SPATIALFILTER>\n';
	}
	theString += '</SPATIALQUERY>';
	theString += '</GET_FEATURES>';
	theString += '</REQUEST>';
	theString += '</ARCXML>';
	//alert(theString);
	selectLayer=ActiveLayer;
	selectType=ActiveLayerType;
	selectCount=0;
	hightlightedOne="";
	selectPoints.length=1;
	selectLeft.length=1;
	selectRight.length=1;
	selectTop.length=1;
	selectBottom.length=1;
	return theString;
	
}

// request a selection using a shape
function sendShapeSelect(theType) {
	queryStartRecord=1;
	selectionMode=3;
	showBuffer=false;
	if (theType==2) {
		if ((clickPointX[0]!=clickPointX[clickCount-1]) && (clickPointY[0]!=clickPointY[clickCount-1])) {
			clickPointX[clickCount]=clickPointX[0];
			clickPointY[clickCount]=clickPointY[0];
			clickCount=clickCount+1;
		}