construct: function (map) {  this._dciMap = map;  this._onClickHandler = dojo.hitch(this, this._onClickHandler);  this._onMouseMoveHandler = dojo.hitch(this, this._onMouseMoveHandler);  this._onDrawEndHandler = dojo.hitch(this, this._onDrawEndHandler);  this._onExtentChangeHandler = dojo.hitch(this, this._onExtentChangeHandler);  this._onGraphicClearHandler = dojo.hitch(this, this._onGraphicClearHandler);  this._graphicsLayer = new esri.layers.GraphicsLayer({ id: "DciMeatureGLyr" });
}  

DUtil.getDistanceInEarth = function (point1, point2) {
var d = new Number(0);
//1度等于0.0174532925199432957692222222222弧度
//var radPerDegree=0.0174532925199432957692222222222;
var radPerDegree = Math.PI / 180.0;
if (DCI.Measure.map.spatialReference.wkid == "4326") {
var latLength1 = Math.abs(this.translateLonLatToDistance({ x: point1.x, y: point2.y }).x - this.translateLonLatToDistance({ x: point2.x, y: point2.y }).x);
var latLength2 = Math.abs(this.translateLonLatToDistance({ x: point1.x, y: point1.y }).x - this.translateLonLatToDistance({ x: point2.x, y: point1.y }).x);
var lonLength = Math.abs(this.translateLonLatToDistance({ x: point1.x, y: point2.y }).y - this.translateLonLatToDistance({ x: point1.x, y: 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 {
var len_prj = Math.pow((point2.x - point1.x), 2) + Math.pow((point2.y - point1.y), 2);  d = Math.sqrt(len_prj);  }  d = Math.ceil(d);
return d;
};
DUtil.translateLonLatToDistance = function (point) {
var d = new Number(0);
//1度等于0.0174532925199432957692222222222弧度
//var radPerDegree=0.0174532925199432957692222222222;
var radPerDegree = Math.PI / 180.0;
var equatorialCircumference = 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****
DUtil.getTriangleArea = function (point1, point2, point3) {  var area = 0;  if (!point1 || !point2 || !point3) {  return 0;  }  if (DCI.Measure.map.spatialReference.wkid == "4326") {  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;  return area;
};