WEBGIS纯客户端计算面积及长度Word文件下载.docx

WEBGIS纯客户端计算面积及长度Word文件下载.docx

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sourceinstanceofwindow.Event;

if（!

sourceIsEvt&

source.hasOwnProperty&

source.hasOwnProperty（'

toString'

））{

destination.toString=source.toString;

returndestination;

};

GISUtil.getDistanceInEarth=function（point1,point2）{

vard=newNumber（0）;

//1度等于0.0174532925199432957692222222222弧度

//varradPerDegree=0.0174532925199432957692222222222;

varradPerDegree=Math.PI/180.0;

if（GIS.Measure.map.spatialReference.wkid=="

4326"

）{

varlatLength1=Math.abs（this.translateLonLatToDistance（{x:

point1.x,y:

point2.y}）.x-this.translateLonLatToDistance（{x:

point2.x,y:

point2.y}）.x）;

varlatLength2=Math.abs（this.translateLonLatToDistance（{x:

point1.y}）.x-this.translateLonLatToDistance（{x:

point1.y}）.x）;

varlonLength=Math.abs（this.translateLonLatToDistance（{x:

point2.y}）.y-this.translateLonLatToDistance（{x:

point1.y}）.y）;

d=Math.sqrt（Math.pow（lonLength,2）-Math.pow（Math.abs（latLength1-latLength2）/2,2）+Math.pow（Math.abs（latLength1-latLength2）/2+Math.min（latLength1,latLength2）,2））;

else{

varlen_prj=Math.pow（（point2.x-point1.x）,2）+Math.pow（（point2.y-point1.y）,2）;

d=Math.sqrt（len_prj）;

d=Math.ceil（d）;

returnd;

GISUtil.translateLonLatToDistance=function（point）{

//1度等于0.0174532925199432957692222222222弧度varradPerDegree=0.0174532925199432957692222222222;

varequatorialCircumference=Math.PI*2*6378137;

return{

x:

Math.cos（point.y*radPerDegree）*equatorialCircumference*Math.abs（point.x/360）,

y:

equatorialCircumference*Math.abs（point.y/360）

};

//******求三角形面积****

GISUtil.getTriangleArea=function（point1,point2,point3）{

vararea=0;

point1||!

point2||!

point3）{

return0;

point1=this.translateLonLatToDistance（point1）;

point2=this.translateLonLatToDistance（point2）;

point3=this.translateLonLatToDistance（point3）;

area=（（point1.x*point2.y-point2.x*point1.y）+（point2.x*point3.y-point3.x*point2.y）+（point3.x*point1.y-point1.x*point3.y））/2;

returnarea;

GISMapAction={

ZOOMIN:

"

action_zoomin"

ZOOMOUT:

action_zoomout"

PAN:

action_pan"

DISTANCE:

action_distance"

AREA:

action_area"

GISMeatureType={

distance"

area"

GISMeatureUnit={

HECTARE:

HECTARE"

SMETER:

SMETER"

SKILOMETER:

SKILOMETER"

ACRES:

ACRES"

DObject=function（）{

varClass=function（）{

if（arguments&

arguments[0]!

=null）{

this.construct.apply（this,arguments）;

varextended={};

varparent;

for（vari=0,len=arguments.length;

i<

len;

++i）{

if（typeofarguments[i]=="

parent=arguments[i].prototype;

}else{

parent=arguments[i];

GISUtil.extend（extended,parent）;

Class.prototype=extended;

returnClass;

if（typeofGIS=="

undefined"

）{varGIS={};

GIS.Measure={

/**

*全局变量

*/

map:

null,//地图对象

meatureTool:

null,

onDrawEnd:

drawToolbar:

markerSymbol:

lineSymbol:

fillSymbol:

*初始化加载部分

Init:

function（map）{

GIS.Measure.map=map;

this.markerSymbol=newesri.symbol.SimpleMarkerSymbol（esri.symbol.SimpleMarkerSymbol.STYLE_CIRCLE,8,newesri.symbol.SimpleLineSymbol（esri.symbol.SimpleLineSymbol.STYLE_SOLID,newdojo.Color（[255,69,0]）,2）,newdojo.Color（[255,255,255,1]））;

this.lineSymbol=newesri.symbol.SimpleLineSymbol（esri.symbol.SimpleLineSymbol.STYLE_SOLID,newdojo.Color（[255,160,122]）,2）;

this.fillSymbol=newesri.symbol.SimpleFillSymbol（esri.symbol.SimpleFillSymbol.STYLE_SOLID,newesri.symbol.SimpleLineSymbol（esri.symbol.SimpleLineSymbol.STYLE_SOLID,newdojo.Color（[255,160,122]）,2）,newdojo.Color（[255,255,255,0.5]））;

GIS.Measure._initDrawTool（）;

GIS.Measure.meatureTool=newGISMeature（map）;

},

_initDrawTool:

function（）{

varT=this;

this.drawToolbar=newesri.toolbars.Draw（GIS.Measure.map,{showTooltips:

false}）;

this.drawToolbar.markerSymbol=this.markerSymbol;

this.drawToolbar.lineSymbol=this.lineSymbol;

this.drawToolbar.fillSymbol=this.fillSymbol;

dojo.connect（this.drawToolbar,"

onDrawEnd"

function（geometry）{

if（T.onDrawEnd）{

T.onDrawEnd（geometry）;

}）;

//动态测距

measureDistance:

this.setMapCursor（"

url（'

../Widget/style/cursor/draw.cur'

）,auto"

）;

this.meatureTool.activate（GISMeatureType.DISTANCE）;