supermap.is.utility.js

地理信息系统方面的开发源码

//========================================================================== 
// SuperMap IS 客户端程序,版权所有，北京超图地理信息技术有限公司，2000-2006。 
// 本程序只能在有效的授权许可下使用。未经许可，不得以任何手段擅自使用或传播。 
// 作者：			SuperMap IS Team 
// 修改：	 
// 文件名：			SuperMap.IS.Utility.js  
// 功能：			AjaxMap 辅助方法   
// 最后修改时间：	2006-05-23 
//========================================================================== 


function RegisterNamespaces(){for(var i=0;i<arguments.length;i++){var gv=arguments[i].split(".");var gX=window;for(var j=0;j<gv.length;j++){if(!gX[gv[j]]){gX[gv[j]]=new Object();}gX=gX[gv[j]];}}}
RegisterNamespaces("SuperMap.IS");

//from prototype.js
function $() {
  var elements = new Array();

  for (var i = 0; i < arguments.length; i++) {
    var element = arguments[i];
    if (typeof element == 'string')
      element = document.getElementById(element);

    if (arguments.length == 1)
      return element;

    elements.push(element);
  }

  return elements;
}

//from Yahoo! dragdrop_1.0.2.js
function _GetScroll(){var t,l;if(document.documentElement&&document.documentElement.scrollTop){t=document.documentElement.scrollTop;l=document.documentElement.scrollLeft;}else{if(document.body){t=document.body.scrollTop;l=document.body.scrollLeft;}}return {top:t,left:l};};
function _GetStyle(el,_95){if(el.style.styleProp){return el.style.styleProp;}else{if(el.currentStyle){return el.currentStyle[_95];}else{if(document.defaultView){return document.defaultView.getComputedStyle(el,null).getPropertyValue(_95);}}}};
function _GetScrollTop(){return _GetScroll().top;};
function _GetScrollLeft(){return _GetScroll().left;};
//_AddEvent(element,"mousedown",handleMouseDown)
function _AddEvent(el,eventType,fn,useCapture){if(eventType.indexOf("on")==0){eventType=eventType.substring(2);}useCapture=(useCapture)?true:false;if(el.addEventListener){el.addEventListener(eventType,fn,useCapture);}else{if(el.attachEvent){el.attachEvent("on"+eventType,fn);}else{el["on"+eventType]=fn;}}};
function _RemoveEvent(el,eventType,fn,useCapture){if(eventType.indexOf("on")==0){eventType=eventType.substring(2);}useCapture=(useCapture)?true:false;if(el.removeEventListener){el.removeEventListener(eventType,fn,useCapture);}else{if(el.detachEvent){el.detachEvent("on"+eventType,fn);}else{el["on"+eventType]=null;}}};
function _FixIEEvent(ev){
	if(typeof ev.charCode=="undefined"){ev.charCode=(ev.type=="keypress")?ev.keyCode:0;ev.isChar=(ev.charCode>0);}if(ev.srcElement&&!ev.target){ev.eventPhase=2;ev.pageX=ev.clientX+_GetScrollLeft();ev.pageY=ev.clientY+_GetScrollTop();
	if(!ev.preventDefault){ev.preventDefault=function(){this.returnValue=false;};}if(ev.type=="mouseout"){ev.relatedTarget=ev.toElement;}else{if(ev.type=="mouseover"){ev.relatedTarget=ev.fromElement;}}
	if(!ev.stopPropagation){ev.stopPropagation=function(){this.cancelBubble=true;};}ev.target=ev.srcElement;ev.time=(new Date).getTime();}return ev;
};
function _FixDOMEvent(ev){if(!ev.srcElement){ev.srcElement=ev.originalTarget;}if(!ev.pageX&&ev.clientX&&ev.clientY){ev.pageX=ev.clientX;ev.pageY=ev.clientY;}return ev;};
// 下面这个方法有内存泄漏，暂时弃用。 
//function _GetEvent(e){if(ygPos.browser=="ie"){ev=_FixIEEvent(window.event);}else{ev=_GetEvent.caller.arguments[0];ev=_FixDOMEvent(_GetEvent.caller.arguments[0]);}return ev;};
//function _GetEvent(e){if(window.event){ev=_FixIEEvent(window.event);}else{ev=_GetEvent.caller.arguments[0];ev=_FixDOMEvent(_GetEvent.caller.arguments[0]);}return ev;};

function _GetEvent(e){return e?e:window.event;}
function _CancelBubble(e){e.cancelBubble=true;}
function G(e){e=_GetEvent(e);_CancelBubble(e);return false;}
function _GetMouseX(e){var posX=0;if(e.pageX){posX=e.pageX;}else if(e.clientX){if(document.documentElement&&document.documentElement.scrollLeft){posX=e.clientX+document.documentElement.scrollLeft;}else if(document.body){posX=e.clientX+document.body.scrollLeft;}}return posX;}
function _GetMouseY(e){var posY=0;if(e.pageY){posY=e.pageY;}else if(e.clientY){if(document.documentElement&&document.documentElement.scrollTop){posY=e.clientY+document.documentElement.scrollTop;}else if(document.body){posY=e.clientY+document.body.scrollTop;}}return posY;}
function _GetMouseScrollDelta(e){if(e.wheelDelta){return e.wheelDelta;}else if(e.detail){return-e.detail;}return 0;}
function _GetTarget(e){if(!e){e=window.event;}var t=null;if(e.srcElement){t=e.srcElement;}else if(e.target){t=e.target;}if(t&&t.nodeType){if(t.nodeType==3){t=targ.parentNode;}}return t;}
function _GetElementX(el){var element=el;var x=0;while(element){x+=element.offsetLeft;element=element.offsetParent;}if(navigator.userAgent.indexOf("Mac")!=-1&&typeof(document.body.leftMargin)!="undefined"){x+=document.body.leftMargin;}return x;}
function _GetElementY(el){var element=el;var y=0;while(element){y+=element.offsetTop;element=element.offsetParent;}if(navigator.userAgent.indexOf("Mac")!=-1&&typeof(document.body.topMargin)!="undefined"){y+=document.body.topMargin;}return y;}
//function _GetElementX(el){return ygPos.getX(el);}
//function _GetElementY(el){return ygPos.getY(el);}
function _Floor(d){return Math.floor(d);}function _Ceil(d){return Math.ceil(d);}function _Max(d,f){return Math.max(d,f);}function _Min(d,f){return Math.min(d,f);}function _Abs(d){return Math.abs(d);}function _Round(d){return Math.round(d);}function _AngleToRadian(angle){return angle*Math.PI/180.0;}function _RadianToAngle(radian){return radian*180.0/Math.PI;}

// from Yahoo! position_1.0.2.js
var ygPos=new function(){

	this.getPos=function(oEl){
		var pos=[oEl.offsetLeft,oEl.offsetTop];var parent=oEl.offsetParent;var tmp={x:null,y:null};
		if(parent!=oEl){
			while(parent){
				switch(browser){
					case'ie':
						if(_getStyle(parent,'position')=='relative'&&_getStyle(oEl,'width')=='auto'&&!(_getStyle(oEl,'position')!='static')){return[oEl.offsetLeft,oEl.offsetTop];}
						else if(_getStyle(parent,'width')!='auto'||_getStyle(oEl.parentNode,'position')!='static'){tmp.x=parseInt(_getStyle(parent,'borderLeftWidth'));tmp.y=parseInt(_getStyle(parent,'borderTopWidth'));if(!isNaN(tmp.x))pos[0]+=tmp.x;if(!isNaN(tmp.y))pos[1]+=tmp.y;}
						break;
					case'gecko':
						if(_getStyle(parent,'position')=='relative'){tmp.x=parseInt(_getStyle(parent,'border-left-width'));tmp.y=parseInt(_getStyle(parent,'border-top-width'));if(!isNaN(tmp.x))pos[0]+=tmp.x;if(!isNaN(tmp.y))pos[1]+=tmp.y;}
						break;
				}
				pos[0]+=parent.offsetLeft;pos[1]+=parent.offsetTop;parent=parent.offsetParent;
			}
		}
		if(browser=='ie'&&_getStyle(oEl,'width')!='auto'&&_getStyle(oEl.offsetParent,'width')=='auto'&&_getStyle(oEl.offsetParent,'position')=='relative'){
			parent=oEl.parentNode;
			while(parent.tagName!='HTML'){
				tmp.x=parseInt(_getStyle(parent,'marginLeft'));tmp.y=parseInt(_getStyle(parent,'paddingLeft'));
				if(!isNaN(tmp.x))pos[0]-=tmp.x;if(!isNaN(tmp.y))pos[0]-=tmp.y;
				parent=parent.parentNode;
			}
		}
		return pos;
	},
	this.getX=function(oEl){return this.getPos(oEl)[0];}

	this.getY=function(oEl){return this.getPos(oEl)[1];}

	this.setPos=function(oEl,endPos){
		var offset=[0,0];var delta={x:0,y:0};var curStylePos=_getStyle(oEl,'position');
		if(curStylePos=='static'){oEl.style.position='relative';curStylePos='relative';}
		if(oEl.offsetWidth){
			if(curStylePos=='relative'){offset=this.getPos(oEl);var tmp={x:_getStyle(oEl,'left'),y:_getStyle(oEl,'top')};delta.x=(tmp.x&&tmp.x.indexOf('px')!=-1)?parseInt(tmp.x):0;delta.y=(tmp.y&&tmp.y.indexOf('px')!=-1)?parseInt(tmp.y):0;}
			else{offset=this.getPos(oEl.offsetParent);var tmp={x:_getStyle(oEl,'margin-left'),y:_getStyle(oEl,'margin-top')};delta.x=(tmp.x&&tmp.x.indexOf('px')!=-1)?0-parseInt(tmp.x):0;delta.y=(tmp.y&&tmp.y.indexOf('px')!=-1)?0-parseInt(tmp.y):0;}
		}
		if(browser=='safari'){
			if(oEl.offsetParent&&oEl.offsetParent.tagName=='BODY'){
				if(_getStyle(oEl,'position')=='relative'){delta.x-=document.body.offsetLeft;delta.y-=document.body.offsetTop;}
				else if(_getStyle(oEl,'position')=='absolute'||_getStyle(oEl,'position')=='fixed'){delta.x+=document.body.offsetLeft;delta.y+=document.body.offsetTop;}
			}
		}
		if(endPos[0]!==null)oEl.style.left=endPos[0]-offset[0]+delta.x+'px';
		if(endPos[1]!==null)oEl.style.top=endPos[1]-offset[1]+delta.y+'px';
	}

	this.setX=function(oEl,x){this.setPos(oEl,[x,null]);}

	this.setY=function(oEl,y){this.setPos(oEl,[null,y]);}

	var _getStyle=function(oEl,property){
		var dv=document.defaultView;
		if(oEl.style[property])return oEl.style[property];
		else if(oEl.currentStyle){
			if(property.indexOf('-')!=-1){
				property=property.split('-');
				property[1]=property[1].toUpperCase().charAt(0)+property[1].substr(1);
				property=property.join('');
			}
			if(oEl.currentStyle[property])return oEl.currentStyle[property];
		}
		else if(dv&&dv.getComputedStyle(oEl, '')&&dv.getComputedStyle(oEl,'').getPropertyValue(property)) return dv.getComputedStyle(oEl,'').getPropertyValue(property);
		return null;
	}

	var _getBrowser=function(){
		var ua=navigator.userAgent.toLowerCase();
		if(ua.indexOf('opera')!=-1)return'opera';
		else if(ua.indexOf('msie')!=-1)return'ie';
		else if(ua.indexOf('safari')!=-1)return'safari';
		else if(ua.indexOf('gecko')!=-1)return'gecko';
		else return false;
	}

	var browser=_getBrowser();

	this.browser = browser;
}

//Enable VML support
function _EnableVML()
{
    if(ygPos.browser != "ie"){return;}
	// todo: support ie5.0, ie5.5
	if(document.namespaces){
		document.namespaces.add("v", "urn:schemas-microsoft-com:vml")
	}
	if(document.styleSheets.length < 1){
		var _oStyle = document.createElement("style");
		document.body.appendChild(_oStyle);
	}
	if(document.styleSheets.item(0).addRule){
		document.styleSheets.item(0).addRule("v\\:*", "behavior:url(#default#VML)");
	}
}

function show_props(obj, objName) {
   var result = "";
   for (var i in obj) {
      result += objName + "." + i + " = " + obj[i] + "\n";
   }
   return result;
} 

function _GetXmlHttpRequest(){
	var xh=null;
	try{xh=new ActiveXObject("Msxml2.XMLHTTP");}catch(ex){
		try{xh=new ActiveXObject("Microsoft.XMLHTTP");}catch(ex){xh=null;}}
	if(!xh&&typeof XMLHttpRequest!="undefined"){xh=new XMLHttpRequest();}
	return xh;
}

function _ToJSON(o){

	if(o == null)
		return "null";

	switch(o.constructor) {
		case String:
			var s = o; // .encodeURI();
			s = '"' + s.replace(/(["\\])/g, '\\$1') + '"';
			s = s.replace(/\n/g,"\\n");
			s = s.replace(/\r/g,"\\r");
			return s;
		case Array:
			var v = [];
			for(var i=0; i<o.length; i++)
				v.push(_ToJSON(o[i])) ;
			return "[" + v.join(", ") + "]";
		case Number:
			return isFinite(o) ? o.toString() : _ToJSON(null);
		case Boolean:
			return o.toString();
		case Date:
			var d = new Object();
			d.__type = "System.DateTime";
			d.Year = o.getUTCFullYear();
			d.Month = o.getUTCMonth() +1;
			d.Day = o.getUTCDate();
			d.Hour = o.getUTCHours();
			d.Minute = o.getUTCMinutes();
			d.Second = o.getUTCSeconds();
			d.Millisecond = o.getUTCMilliseconds();
			d.TimezoneOffset = o.getTimezoneOffset();
			return _ToJSON(d);
		default:
			if(o["toJSON"] != null && typeof o["toJSON"] == "function")
				return o.toJSON();
			if(typeof o == "object") {
				var v=[];
				for(attr in o) {
					if(typeof o[attr] != "function")
						v.push('"' + attr + '": ' + _ToJSON(o[attr]));
				}

				if(v.length>0)
					return "{" + v.join(", ") + "}";
				else
					return "{}";		
			}
			return o.toString();
	}
};

function _FromJSON(o, j){
    if(!j){return;}
    for(var m in j){
        if(typeof(o[m]) == "object"){
            _FromJSON(o[m], j[m]);
        }
        else if(typeof(o[m]) != "function" && typeof(o[m]) != "undefined"){
            o[m] = j[m];
        }
    }
};

function _SplitX(points, offsetX)
{
	if(typeof(offsetX)=="undefined"){offsetX=0;}
	var pxs=new Array();
	for(var i=0; i<points.length/2; i++){pxs.push(parseInt(points[2*i])+parseInt(offsetX));}
	return pxs;
}

function _SplitY(points,offsetY)
{
	if(typeof(offsetY)=="undefined"){offsetY=0;}
	var pys=new Array();
	for(var i=0; i<points.length/2; i++){pys.push(parseInt(points[2*i+1])+parseInt(offsetY));}
	return pys;
}