如何判断一个指定的经纬度点是否落在一个多边形区域内？
百度MAP里面的JS代码
//点在多边形内
function ptInPolygon(){
var pts = [];
var pt1 = new BMap.Point(116.395, 39.910);
var pt2 = new BMap.Point(116.394, 39.914);
var pt3 = new BMap.Point(116.403, 39.920);
var pt4 = new BMap.Point(116.402, 39.914);
var pt5 = new BMap.Point(116.410, 39.913);
pts.push(pt1);
pts.push(pt2);
pts.push(pt3);
pts.push(pt4);
pts.push(pt5);
var ply = new BMap.Polygon(pts);
var pt =new BMap.Point(116.400, 39.914);
var result = BMapLib.GeoUtils.isPointInPolygon(pt, ply);
if(result == true){
alert("点在多边形内");
} else {
alert("点在多边形外")
}
//演示：将面添加到地图上
map.clearOverlays();
var mkr = new BMap.Marker(pt);
map.addOverlay(mkr);
map.addOverlay(ply);
}
b.isPointInPolygon = function(o, l) {
if (! (o instanceof BMap.Point) || !(l instanceof BMap.Polygon)) {
return false
}
var k = l.getBounds();
if (!this.isPointInRect(o, k)) {
return false
}
var t = l.getPath();
var h = t.length;
var n = true;
var j = 0;
var g = 2e-10;
var s, q;
var e = o;
s = t[0];
for (var f = 1; f <= h; ++f) {
if (e.equals(s)) {
return n
}
q = t[f % h];
if (e.lat < Math.min(s.lat, q.lat) || e.lat > Math.max(s.lat, q.lat)) {
s = q;
continue
}
if (e.lat > Math.min(s.lat, q.lat) && e.lat < Math.max(s.lat, q.lat)) {
if (e.lng <= Math.max(s.lng, q.lng)) {
if (s.lat == q.lat && e.lng >= Math.min(s.lng, q.lng)) {
return n
}
if (s.lng == q.lng) {
if (s.lng == e.lng) {
return n
} else {++j
}
} else {
var r = (e.lat - s.lat) * (q.lng - s.lng) / (q.lat - s.lat) + s.lng;
if (Math.abs(e.lng - r) < g) {
return n
}
if (e.lng < r) {++j
}
}
}
} else {
if (e.lat == q.lat && e.lng <= q.lng) {
var m = t[(f + 1) % h];
if (e.lat >= Math.min(s.lat, m.lat) && e.lat <= Math.max(s.lat, m.lat)) {++j
} else {
j += 2
}
}
}
s = q
}
if (j % 2 == 0) {
return false
} else {
return true
}
};
SuperMap.IS.Utility.js 里面找到的代码
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 if (typeof $ != 'function') { $ = 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.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.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) { return _GetOffset(el).left; } function _GetElementY(el) { return _GetOffset(el).top; } //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 false; } // todo: support ie5.0, ie5.5 var returnValue = true; if (typeof (document.namespaces) == "undefined" || typeof (document.namespaces) == "unknown") { return; } if (document.namespaces && !document.namespaces["v"]) { 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) { try { // ie8 标准模式下不支持VML。faint。 document.styleSheets.item(0).addRule("v\\:*", "behavior:url(#default#VML); display:inline-block"); } catch (ex) { returnValue = false; } } _EnableVML = function() { /*nothing but just return true.*/return returnValue; }; return returnValue; } function _ShowProps(obj, objName) { var result = ""; for (var i in obj) { result += objName + "." + i + " = " + obj[i] + "\n"; } return result; } function _GetXmlHttpRequest() { var xh = null; var ie = (navigator.userAgent.toLowerCase().indexOf("msie") != -1); if (ie) { 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, isEncode) { 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"); if (isEncode == true) { return encodeURIComponent(s); } return s; case Array: var v = []; for (var i = 0; i < o.length; i++) v.push(_ToJSON(o[i], isEncode)); 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, isEncode); 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], isEncode)); } 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; } function _ActionToJSON(type, params) { var json = ""; if (!type) { return; } var o = new Object(); o.type = type; if (params) { o.params = params; if (o.params.length > 0) { for (var i = 0; i < o.params.length; i++) { if (typeof (o.params[i]) == "function") { //并加一个标识 o.params[i] = "*function*:" + _GetFunctionName(o.params[i]); } } } } json = _ToJSON(o); return json; } function _JSONToAction(json) { var o = eval('(' + json + ')'); var strParams = ""; if (o.params) { for (var i = 0; i < o.params.length; i++) { if (i != 0) { strParams += ","; } if (typeof (o.params[i]) == "string") { //是否是function转换来的? var index = o.params[i].indexOf("*function*:"); if (index == 0) { o.params[i] = o.params[i].substring(11); strParams += "eval(o.params[" + i + "])"; continue; } } strParams += "o.params[" + i + "]"; } } var str = "new " + o.type + "(" + strParams + ")"; return eval(str); } function _GetFunctionName(fun) { //只要名称,不要内容 var funContent = fun.toString(); var startIndex = funContent.indexOf(" "); var endIndex = funContent.indexOf("("); return funContent.substring(startIndex + 1, endIndex); } function _BackupLayers(_layersBackup, layers) { if (_layersBackup) { while (_layersBackup.length > 0) { var layer = _layersBackup.pop(); layer.Destroy(); layer = null; } } if (layers) { var count = layers.length; if (_layersBackup == null) { _layersBackup = new Array(); } for (var i = 0; i < count; i++) { if (layers[i]) { _layersBackup[i] = new SuperMap.IS.Layer(); _layersBackup[i].Copy(layers[i]); } else { if (_layersBackup[i]) { _layersBackup[i].Destroy(); _layersBackup[i] = null; } } } } } function _FindDifference(_layersBackup, layers) { var changedLayersJSON = ""; var changedLayers = new Array(); if (!layers) { return changedLayersJSON; } var count = layers.length; for (var i = 0; i < count; i++) { if (layers[i]) { if (!_layersBackup[i]) { if (changedLayers.length > 0) { changedLayersJSON = changedLayersJSON + ","; } //changedLayers.push(_layers[i]); changedLayers[i] = layers[i]; changedLayersJSON += i.toString(); continue; } var o = SMISCompare(_layersBackup[i], layers[i]); // var o=_layersBackup[i].Compare(layers[i]); if (o) { /* if(changedLayers.length>0){changedLayersJSON =changedLayersJSON+",";} changedLayersJSON+=i.toString(); changedLayersJSON+="|"; if(o.themeRange&&o.themeRange.breakValueIndex) { changedLayersJSON+=o.themeRange.breakValueIndex; } changedLayersJSON+="|"; if(o.themeRange&&o.themeRange.displaysIndex) { changedLayersJSON+=o.themeRange.displaysIndex; } changedLayersJSON+="|"; if(o.themeGraph&&o.themeGraph.graphStyleIndex) { changedLayersJSON+=o.themeGraph.graphStyleIndex; } */ changedLayers[i] = o; } else { changedLayers[i] = "!@"; } } else { //layer已被修改为null changedLayers[i] = null; if (i != 0) { changedLayersJSON = changedLayersJSON + ","; } changedLayersJSON += i.toString(); } } changedLayersJSON = _ToJSON(changedLayers); return changedLayersJSON; } //以后如果有了打印控件的脚本,就把这个方法转移过去 function SMISPrintMap(param, mapControlPage, printControlPage, imageHandlerEnabled, map) { if (!param || !mapControlPage || !printControlPage) { return false; } var mapParam = eval('(' + param.mapParam + ')'); var queryUrl = param.mapHandler + "common.ashx"; var mapName = mapParam.mapName; var methodName = "GetUrl"; function onRequestComplete(responseText) { if (!responseText) { return; } var url = responseText; printUrl = printControlPage + "?&Url=" + url + "&MapName=" + mapName + "&MapScale=" + mapParam.mapScale + "&MapControlPage=" + mapControlPage + "&ImageHandlerEnabled=" + imageHandlerEnabled + "&trackingLayerHistoryIndex=" + mapParam.trackingLayerIndex + "&userId=" + mapParam.userID; var printWin = window.open(printUrl, "", "resizable,toolbar,menubar,scrollbars,status"); var hiddenLayers = document.getElementById("hiddenLayersForPrint"); hiddenLayers.value = _ToJSON(map.layers); var hiddenMapParam = document.getElementById("hiddenMapParamForPrint"); hiddenMapParam.value = _ToJSON(map.GetMapParam()) }; var reuqestManager = new SuperMap.IS.RequestManager(queryUrl, onRequestComplete, null); reuqestManager.AddQueryString("map", mapName); reuqestManager.AddQueryString("method", methodName); reuqestManager.AddQueryString("layersKey", param.layersKey); reuqestManager.AddQueryString("viewer", param.viewer); reuqestManager.AddQueryString("mapCenter", _ToJSON(mapParam.center)); reuqestManager.AddQueryString("mapScale", mapParam.mapScale); reuqestManager.AddQueryString("viewBounds", _ToJSON(mapParam.viewBounds)); reuqestManager.Send(); reuqestManager.Destroy(); reuqestManager = null; } function SMISGetMapParam() { var hiddenLayers = window.opener.document.getElementById("hiddenLayersForPrint"); if (hiddenLayers) { var hiddenPrintLayers = document.getElementById("hiddenLayersInfo"); hiddenPrintLayers.value = hiddenLayers.value; } var hiddenMapParam = window.opener.document.getElementById("hiddenMapParamForPrint"); if (hiddenMapParam) { var hiddenPrintMapParam = document.getElementById("hiddenMapParamInfo"); hiddenPrintMapParam.value = hiddenMapParam.value; } } function SMISCompare(object1, object2) { // if(!object1||!object2||typeof(object1)!="object"||typeof(object2)!="object"){return;} // if(object1.constructor!=object2.constructor){return;} var newObject = null; if (typeof (object1) != "object" && typeof (object1) != "function" && typeof (object2) != "object" && typeof (object2) != "function") { if (object1 != object2) { newObject = object2; } } else { if (object1 == null || object2 == null) { newObject = object2; return newObject; } for (var property in object1) { if (object2[property] == null) { if (object1[property] == null) { continue; } else { if (!newObject) { newObject = new Object(); } newObject[property] = null; continue; } } //还要考虑object1[property] == null的情况 if (object1[property] == null) { //由于上面已经考虑了两者都为null的情况，此处object2[property]必不为null if (!newObject) { newObject = new Object(); } newObject[property] = object2[property]; continue; } if (object2[property] == object1[property]) { continue; } else { if (object2[property].constructor == Array) { var length = object1[property].length > object2[property].length ? object1[property].length : object2[property].length; for (var i = 0; i < length; i++) { var result = SMISCompare(object1[property][i], object2[property][i]); if (result != null) { if (!newObject) { newObject = new Object(); } if (!newObject[property]) { newObject[property] = new Array(); } newObject[property][i] = result; } else { if (typeof (result) != "undefined") { if (!newObject) { newObject = new Object(); } if (!newObject[property]) { newObject[property] = new Array(); } newObject[property][i] = "!@"; } } } } else if (object2[property].constructor == Function) { continue; } else { var result = SMISCompare(object1[property], object2[property]); if (result != null) { if (!newObject) { newObject = new Object(); } newObject[property] = result; } } } } } return newObject; } function _AdjustCustomMarkPosition(customMarkID, alignStyle) { var customMark = document.getElementById(customMarkID); var offsetX, offsetY; if (customMark) { switch (alignStyle) { case 0: offsetX = 0; offsetY = 0; break; case 1: offsetX = 0; offsetY = customMark.offsetHeight / 2; break; case 2: offsetX = 0; offsetY = customMark.offsetHeight; break; case 3: offsetX = customMark.offsetWidth / 2; offsetY = 0; break; case 4: offsetX = customMark.offsetWidth / 2; offsetY = customMark.offsetHeight / 2; break; case 5: offsetX = customMark.offsetWidth / 2; offsetY = customMark.offsetHeight; break; case 6: offsetX = customMark.offsetWidth; offsetY = 0; break; case 7: offsetX = customMark.offsetWidth; offsetY = customMark.offsetHeight / 2; break; case 8: offsetX = customMark.offsetWidth; offsetY = customMark.offsetHeight; break; default: offsetX = 0; offsetY = 0; break; } // 没有必要设置zIndex //customMark.style.zIndex = 1000; customMark.style.left = (parseFloat(customMark.style.left) - offsetX) + "px"; customMark.style.top = (parseFloat(customMark.style.top) - offsetY) + "px"; } } function _CreateMapControl(clientID, centerX, centerY, mapScale, bModifiedByServer, mapHandler, mapName, imageFormat, fixedView, buffer, trackingLayerIndex, userID, writeScalesInfoToScript, antiAlias, disableLogo, tileSize, useImageBuffer, wheelZoomByMouse, tileCheckTime, redirect) { var doc = document; // var container = $(clientID); var container = doc.getElementById(clientID); var params = new Object(); // 为支持Jquery 等插件的使用 // var hiddenLayers = $(clientID + "_hiddenLayers"); var hiddenLayers = doc.getElementById(clientID + "_hiddenLayers"); if (hiddenLayers && hiddenLayers.value) { var layers = eval(hiddenLayers.value); if (layers) { params.layers = new Array(); for (var i = 0; i < layers.length; i++) { if (layers[i]) { params.layers[i] = new SuperMap.IS.Layer(); params.layers[i].FromJSON(layers[i]); } } } } // var hiddenMapParam = $(clientID + "_hiddenMapParam"); var hiddenMapParam = doc.getElementById(clientID + "_hiddenMapParam"); if (hiddenMapParam && hiddenMapParam.value) { var paramInfo = hiddenMapParam.value; var mapParam = eval('(' + paramInfo + ')'); params.x = mapParam.center.x; params.y = mapParam.center.y; params.mapScale = mapParam.mapScale; if (mapParam.mapBounds) { params.mapBounds = new SuperMap.IS.MapRect(); params.mapBounds.Copy(mapParam.mapBounds); } } else { params.x = centerX; params.y = centerY; params.mapScale = mapScale; } // var hiddenWmsLayer = $(clientID + "_hiddenWmsLayers"); var hiddenWmsLayer = doc.getElementById(clientID + "_hiddenWmsLayers"); if (hiddenWmsLayer && hiddenWmsLayer.value) { var wmsLayersInfo = hiddenWmsLayer.value; var wmsLayers = eval('(' + wmsLayersInfo + ')'); } params.bModifiedByServer = bModifiedByServer; //是否进行了编辑 params.mapHandler = mapHandler; params.mapName = mapName; params.imageFormat = imageFormat; params.fixedView = fixedView; params.buffer = buffer; params.trackingLayerIndex = trackingLayerIndex; params.userID = userID; eval(writeScalesInfoToScript); params.antiAlias = antiAlias; params.disableLogo = disableLogo; params.tileSize = tileSize; params.useImageBuffer = useImageBuffer; params.wheelZoomByMouse = wheelZoomByMouse; params.tileCheckTime = tileCheckTime; params.redirect = redirect; params.storeClientInfo = true; eval(clientID + "=new SuperMap.IS.MapControl(container,params);"); }; function _InitMapControl(clientID) { var init = function() { eval(clientID + ".Init();"); } return init; }; function _InitMapControlInternal(clientID) { eval(clientID + ".Init()"); } function _DisposeMapControl(clientID) { var destroy = function() { eval("if(" + clientID + "){" + clientID + ".Destroy();" + clientID + "=null;}"); } return destroy; }; function _DisposeMapControlInternal(clientID) { eval("if(" + clientID + "){" + clientID + ".Destroy();" + clientID + "=null;}"); }; function _IsInCurrentDomain(url) { if (!url) { return true; } // 本地文件页面地址，直接返回 true。 if (document.location.protocol.toLowerCase() == "file:") { return true; } var index = url.indexOf("//"); // 相对路径 if (index == -1) { return true; } var protocol = url.substring(0, index); if (document.location.protocol.toLowerCase() != protocol.toLowerCase()) { return false; } var subText = url.substring(index + 2); // "//"之后的部分 var domainWithPortIndex = subText.indexOf("/"); var domainWithPort = subText.substring(0, domainWithPortIndex); var portIndex = domainWithPort.indexOf(":"); var domain = domainWithPort; if (portIndex != -1) { domain = domainWithPort.substring(0, portIndex); } if (domain != document.location.hostname) { return false; } var currentPort = document.location.port; if (!currentPort || currentPort == "") { var currentProtocolLower = document.location.protocol.toLowerCase(); switch (currentProtocolLower) { case "http:": currentPort = 80; break; case "https:": currentPort = 443; break; case "ftp:": currentPort = 21; break; case "file:": currentPort = ""; break; default: currentPort = 80; break; } } var port = 80; if (portIndex != -1) { port = domainWithPort.substring(portIndex + 1); } else { var protocolLower = protocol.toLowerCase(); switch (protocolLower) { case "http:": port = 80; break; case "https:": port = 443; break; case "ftp:": port = 21; break; case "file:": port = ""; break; default: port = 80; break; } } if (port != currentPort) { return false; } return true; } // 支持 Firebug 形式的控制台调试。 if (!console) { var console = { log: function() { } }; var cn = ["assert", "count", "debug", "dir", "dirxml", "error", "group", "groupEnd", "info", "profile", "profileEnd", "time", "timeEnd", "trace", "warn", "log"]; var i = 0, tn; while ((tn = cn[i++])) { if (!console[tn]) { (function() { var _c = tn + ""; console[_c] = function() { var a = Array.apply({}, arguments); a.unshift(_c + ":"); console.log(a.join(" ")); }; })(); } } }; function isPointInGeometry(position, geometry, tolerance) { if (!position || !geometry) { return; } if (!tolerance || tolerance < 0) { tolerance = 0; } switch (geometry.feature) { case SuperMap.IS.FeatureType.point: var distance = Math.sqrt(Math.pow(geometry.points[0].x - position.x, 2) + Math.pow(geometry.points[0].y - position.y, 2)); if (distance <= tolerance) { return true; } break; case SuperMap.IS.FeatureType.line: for (var i = 0; i < geometry.points.length - 1; i++) { var distance = DistPtToLine(geometry.points[i], geometry.points[i + 1], position); if (distance > 0 && distance <= tolerance) { return true; } } break; case SuperMap.IS.FeatureType.polygon: if (IsPointInPolygon(position, geometry)) { return true; } else { for (var i = 0; i < geometry.points.length - 1; i++) { var distance = DistPtToLine(geometry.points[i], geometry.points[i + 1], position); if (distance > 0 && distance <= tolerance) { return true; } } //需要考虑闭合的情况，可能多边形的点最后一个点和第一个点不相等 { var distance = DistPtToLine(geometry.points[geometry.points.length - 1], geometry.points[0], position); if (distance > 0 && distance <= tolerance) { return true; } } } break; default: return false; } return false; }; function DistPtToLine(pntStart, pntEnd, pntHitTest) { var dist = -1; if (pntStart.x == pntEnd.x && pntStart.y == pntEnd.y) { return -1; } //判断交点是否在延长线上 var distanceA = Math.sqrt(Math.pow(pntHitTest.x - pntStart.x, 2) + Math.pow(pntHitTest.y - pntStart.y, 2)); var distanceB = Math.sqrt(Math.pow(pntHitTest.x - pntEnd.x, 2) + Math.pow(pntHitTest.y - pntEnd.y, 2)); var distanceC = Math.sqrt(Math.pow(pntStart.x - pntEnd.x, 2) + Math.pow(pntStart.y - pntEnd.y, 2)); var angleA = Math.acos((distanceB * distanceB + distanceC * distanceC - distanceA * distanceA) / (2 * distanceB * distanceC)) / Math.PI * 180; var angleB = Math.acos((distanceA * distanceA + distanceC * distanceC - distanceB * distanceB) / (2 * distanceA * distanceC)) / Math.PI * 180; if (angleA >= 90 || angleB >= 90) { return distanceA < distanceB ? distanceA : distanceB; } var pntMiddle = new SuperMap.IS.MapCoord(); var dDaltaX = pntEnd.x - pntStart.x; var dDaltaY = pntStart.y - pntEnd.y; var dDaltaX2 = dDaltaX * dDaltaX; var dDaltaY2 = dDaltaY * dDaltaY; var dDeltaXY = dDaltaX * dDaltaY; var dLineSectDist = dDaltaX * dDaltaX + dDaltaY * dDaltaY; pntMiddle.x = (dDeltaXY * (pntStart.y - pntHitTest.y) + pntStart.x * dDaltaY2 + pntHitTest.x * dDaltaX2) / dLineSectDist; pntMiddle.y = (dDeltaXY * (pntStart.x - pntHitTest.x) + pntStart.y * dDaltaX2 + pntHitTest.y * dDaltaY2) / dLineSectDist; dDaltaX = pntHitTest.x - pntMiddle.x; dDaltaY = pntHitTest.y - pntMiddle.y; dist = Math.pow((dDaltaX * dDaltaX + dDaltaY * dDaltaY), 0.5); return dist; } function IsPointInPolygon(point, polygon) { if (polygon.feature != SuperMap.IS.FeatureType.polygon) { return false; } // 判断是否在bounds内部。 var bounds = CalcBounds(polygon.points); if (point.x < bounds.leftBottom.x || point.x > bounds.rightTop.x || point.y < bounds.leftBottom.y || point.y > bounds.rightTop.y) { return false; } // 判断是否在边线上。 // 设点为Q，线段为P1P2 ，判断点Q在该线段上的依据是：( Q - P1 ) × ( P2 - P1 ) = 0 且 Q 在以 P1，P2为对角顶点的矩形内。前者保证Q点在直线P1P2上，后者是保证Q点不在线段P1P2的延长线或反向延长线上 var start = 0; var p1; var p2; var isInLine = false; for (var i = 0; i < polygon.parts.length; i++) { for (var j = 0; j < polygon.parts[i]; j++) { p1 = polygon.points[start + j]; if (j == polygon.parts[i] - 1) { p2 = polygon.points[start]; } else { p2 = polygon.points[start + j + 1]; } if (p1.x == p2.x && p1.y == p2.y) { continue; } var cross = (point.x - p1.x) * (p2.y - p1.y) - (point.y - p1.y) * (p2.x - p1.x); if (cross == 0) { if (point.x <= Math.max(p1.x, p2.x) && point.x >= Math.min(p1.x, p2.x) && point.y <= Math.max(p1.y, p2.y) && point.y >= Math.min(p1.y, p2.y)) { isInLine = true; break; } } } if (isInLine) { break; } start += polygon.parts[i]; } if (isInLine) { return true; } start = 0; var oddNODES = false; for (var p = 0; p < polygon.parts.length; p++) { var polySides = polygon.parts[p]; var polyX = new Array(polySides); var polyY = new Array(polySides); var x = point.x; var y = point.y; var j = 0; for (var i = 0; i < polySides; i++) { polyX[i] = polygon.points[start + i].x; polyY[i] = polygon.points[start + i].y; } for (var i = 0; i < polySides; i++) { j++; if (j == polySides) { j = 0; } if ((polyY[i] < y && polyY[j] >= y) || (polyY[j] < y && polyY[i] >= y)) { if (polyX[i] + (y - polyY[i]) / (polyY[j] - polyY[i]) * (polyX[j] - polyX[i]) < x) { oddNODES = !oddNODES; } } } // 已经在某一部分的内部，所以不需要继续判断。 if (oddNODES) { return oddNODES; } start += polySides; } return oddNODES; }; function CalcBounds(points) { if (points == null) { return null; } var maxX, minX, maxY, minY; maxX = minX = maxY = minY = 0; var bounds = new SuperMap.IS.MapRect(); for (var i = 1; i < points.length; i++) { if (points[i] == null) { continue; } if (points[i].x < points[minX].x) { minX = i; } else if (points[i].x > points[maxX].x) { maxX = i; } if (points[i].y < points[minY].y) { minY = i; } else if (points[i].y > points[maxY].y) { maxY = i; } } bounds.leftBottom.x = points[minX].x; bounds.leftBottom.y = points[minY].y; bounds.rightTop.x = points[maxX].x; bounds.rightTop.y = points[maxY].y; return bounds; }; SuperMap.IS.RequestManager = function(url, onComplete, onError, userContext) { var sender = null; if (_IsInCurrentDomain(url)) { sender = new SuperMap.IS.XHRSender(url, onComplete, onError, userContext); } else { sender = new SuperMap.IS.JSONPSender(url, onComplete, onError, userContext); } function _AddQueryString(key, value) { sender.AddQueryString(key, value); }; function _AddQueryStrings(keys, values) { sender.AddQueryStrings(keys, values); }; function _Send() { sender.Send(); }; function _SetTimeout(timeout) { sender.SetTimeout(timeout); }; function _Destroy() { sender.Destroy(); }; this.Send = _Send; this.AddQueryString = _AddQueryString; this.AddQueryStrings = _AddQueryStrings; this.SetTimeout = _SetTimeout; this.Destroy = _Destroy; }; SuperMap.IS.XHRSender = function(url, onComplete, onError, userContext) { var _url = url; var _queryKeys = null; var _queryValues = null; var _timeout = 0; var _timeoutTimer = null; var _requestDone = 0; function _AddQueryString(key, value) { if (_queryKeys == null) { _queryKeys = new Array(); } if (_queryValues == null) { _queryValues = new Array(); } _queryKeys.push(key); _queryValues.push(encodeURIComponent(value)); }; function _AddQueryStrings(keys, values) { if (!keys || keys.length <= 0) { return; } if (!values || values.length <= 0) { return; } if (keys.length != values.length) { return; } if (_queryKeys == null) { _queryKeys = new Array(); } if (_queryValues == null) { _queryValues = new Array(); } for (var i = 0; i < keys.length; i++) { _queryKeys.push(keys[i]); _queryValues.push(_ToJSON(values[i], true)); } }; function _Send() { var url = _url; if (url.indexOf("?") > -1) { url += "&"; } else { url += "?"; } url += "t=" + new Date().getTime(); //防止caching var xhr = _GetXmlHttpRequest(); function _TimeoutHandler() { if (!_requestDone) { _requestDone = 1; clearTimeout(_timeoutTimer); xhr.onreadystatechange = function() { }; xhr.abort(); if (onError) { var timeoutMessage = "Request timed out"; //var timeoutMessage = "XMLHttpRequest:Request timed out.(" + _timeout + "s)"; onError(timeoutMessage, userContext); } } } xhr.open("post", url, true); xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded"); xhr.onreadystatechange = function() { var readyState = xhr.readyState; if (readyState == 4) { _requestDone = 1; var status = xhr.status; if (status == 200) { var tempObject = null; if (xhr.responseText != "") { try { tempObject = eval('(' + xhr.responseText + ')'); } catch (ex) { tempObject = xhr.responseText; } } else { tempObject = eval(xhr.responseText); } if (tempObject && tempObject.error != null) { if (onError) { onError(tempObject.error, userContext); } xhr.onreadystatechange = function() { }; xhr = null; return; } if (onComplete) { onComplete(xhr.responseText, userContext); } } else { if (onError) { onError(xhr.responseText, userContext); } } xhr.onreadystatechange = function() { }; xhr = null; } } var paramString = null; if (_queryKeys && _queryKeys.length > 0) { for (var i = 0; i < _queryKeys.length; i++) { if (i == 0) { paramString = _queryKeys[i] + "=" + _queryValues[i]; } else { paramString += "&" + _queryKeys[i] + "=" + _queryValues[i]; } } } if (_timeout > 0) { _timeoutTimer = setTimeout(function() { !_requestDone && _TimeoutHandler(); }, _timeout); } xhr.send(paramString); }; function _SetTimeout(timeout) { _timeout = timeout; } function _Destroy() { if (_queryKeys != null) { while (_queryKeys.length > 0) { _queryKeys.pop(); } _queryKeys = null; } if (_queryValues != null) { while (_queryValues.length > 0) { _queryValues.pop(); } _queryValues = null; } }; this.Send = _Send; this.AddQueryString = _AddQueryString; this.AddQueryStrings = _AddQueryStrings; this.SetTimeout = _SetTimeout; this.Destroy = _Destroy; }; var supermap_callbacks = {}; SuperMap.IS.JSONPSender = function(url, onComplete, onError, userContext) { var _url = url; var _queryKeys = null; var _queryValues = null; var _splitQuestUrl = null; var _uid = null; var _limitLength = 1720; //ie:2048,firefox:16000,opera:16000 var _timeout = 0; var _timeoutTimer = null; var _requestDone = 0; if (navigator.userAgent.indexOf("IE") < 0) { //_limitLength = 15900;//iis6 _limitLength = 1720; //iis7 } function _AddQueryString(key, value) { if (_queryKeys == null) { _queryKeys = new Array(); } if (_queryValues == null) { _queryValues = new Array(); } _queryKeys.push(key); //_queryValues.push(escape(value)); //escape时对汉字的处理与encodeURIComponent不一致,方便分割时对‘%’的判断 _queryValues.push(encodeURIComponent(value)); //使用encodeURIComponent对 “+” 进行处理 }; function _AddQueryStrings(keys, values) { if (!keys || keys.length <= 0) { return; } if (!values || values.length <= 0) { return; } if (keys.length != values.length) { return; } if (_queryKeys == null) { _queryKeys = new Array(); } if (_queryValues == null) { _queryValues = new Array(); } for (var i = 0; i < keys.length; i++) { _queryKeys.push(keys[i]); _queryValues.push(_ToJSON(values[i], true)); } }; function errorFunction(errorMessage) { clearTimeout(_timeoutTimer); _requestDone = 1; delete supermap_callbacks[_uid]; for (var i = 0; ; i++) { var scriptNode = document.getElementById("_ss_" + _uid + "_" + i); if (!scriptNode) { break; } _RemoveElement(scriptNode); delete scriptNode; scriptNode = null; } if (onError) { onError(errorMessage, userContext); } } function _Send() { if (_url.length > _limitLength) { return false; } var curTime = new Date().getTime(); //只用时间还不保险,Demo切换地图时就有可能_uid相同,再加上一个4位数的随机码 var randomNum = Math.floor(Math.random() * 10000); _uid = curTime * 10000 + randomNum; supermap_callbacks[_uid] = function(json) { _requestDone = 1; delete supermap_callbacks[_uid]; for (var i = 0; ; i++) { var scriptNode = document.getElementById("_ss_" + _uid + "_" + i); if (!scriptNode) { break; } _RemoveElement(scriptNode); delete scriptNode; scriptNode = null; } var tempObject = null; if (json != "") { try { tempObject = eval('(' + json + ')'); } catch (ex) { tempObject = json; } } else { tempObject = eval(json); } if (tempObject && tempObject.error != null) { if (onError) { onError(tempObject.error, userContext); } return; } if (onComplete) { onComplete(json, userContext); } }; _AddQueryString("jsonp", "supermap_callbacks[" + _uid + "]"); var url = _url; //此次url中有多少个key var keysCount = 0; if (_queryKeys && _queryKeys.length > 0) { for (var i = 0; i < _queryKeys.length; i++) { if (url.length + _queryKeys[i].length + 2 >= _limitLength)//+2 for ("&"or"?")and"=" { if (keysCount == 0) { return false; } if (_splitQuestUrl == null) { _splitQuestUrl = new Array(); } _splitQuestUrl.push(url); url = _url; keysCount = 0; i--; } else { if (url.length + _queryKeys[i].length + 2 + _queryValues[i].length > _limitLength) { var leftValue = _queryValues[i]; while (leftValue.length > 0) { var leftLength = _limitLength - url.length - _queryKeys[i].length - 2; //+2 for ("&"or"?")and"=" if (url.indexOf("?") > -1) { url += "&"; } else { url += "?"; } //对leftLength进行微调，不要把编码后的东东分开，e.g：%5D不能被分为%5 和 D var temp = leftValue.substring(0, leftLength); var lastIndex = temp.lastIndexOf('%'); if (leftLength >= 5 && leftLength - lastIndex <= 5) { leftLength = lastIndex; } url += _queryKeys[i] + "=" + leftValue.substring(0, leftLength); leftValue = leftValue.substring(leftLength); if (leftValue.length > 0) { if (_splitQuestUrl == null) { _splitQuestUrl = new Array(); } _splitQuestUrl.push(url); url = _url; keysCount = 0; } } } else { keysCount++; if (url.indexOf("?") > -1) { url += "&"; } else { url += "?"; } url += _queryKeys[i] + "=" + _queryValues[i]; } } } if (_splitQuestUrl == null) { _splitQuestUrl = new Array(); } _splitQuestUrl.push(url); } return _SendInternal(); }; function _SendInternal() { if (!_splitQuestUrl || _splitQuestUrl.length <= 0) { return false; } for (var i = 0; i < _splitQuestUrl.length; i++) { var url = _splitQuestUrl[i]; if (url.indexOf("?") > -1) { url += "&"; } else { url += "?"; } url += "sectionCount=" + _splitQuestUrl.length; url += "§ionIndex=" + i; url += "&jsonpUserID=" + _uid; url += "&t=" + new Date().getTime(); //防止caching var script = document.createElement("script"); script.setAttribute("src", url); script.setAttribute("type", "text/javascript"); script.setAttribute("id", "_ss_" + _uid + "_" + i); document.body.appendChild(script); } if (_timeout > 0) { var timeoutMessage = "Request timed out"; //var timeoutMessage = "JSONP:Request timed out.(" + _timeout + "s)"; _timeoutTimer = setTimeout(function() { !_requestDone && errorFunction(timeoutMessage); }, _timeout); } return true; }; function _SetTimeout(timeout) { _timeout = timeout; } function _Destroy() { if (_queryKeys != null) { while (_queryKeys.length > 0) { _queryKeys.pop(); } _queryKeys = null; } if (_queryValues != null) { while (_queryValues.length > 0) { _queryValues.pop(); } _queryValues = null; } if (_splitQuestUrl != null) { while (_splitQuestUrl.length > 0) { _splitQuestUrl.pop(); } _splitQuestUrl = null; } }; this.Send = _Send; this.AddQueryString = _AddQueryString; this.AddQueryStrings = _AddQueryStrings; this.SetTimeout = _SetTimeout; this.Destroy = _Destroy; }; function _RemoveElement(element) { if (!element || !element.parentNode) { return false; } element.parentNode.removeChild(element); return true; } //from yui_2.6.0 dom.js, Gets the current position of an element based on page coordinates function _GetOffset(el) { var propertyCache = {}; // regex cache var patterns = { ROOT_TAG: /^body|html$/i // body for quirks mode, html for standards, }; function getDocumentScrollLeft(doc) { doc = doc || document; return Math.max(doc.documentElement.scrollLeft, doc.body.scrollLeft); } function getDocumentScrollTop(doc) { doc = doc || document; return Math.max(doc.documentElement.scrollTop, doc.body.scrollTop); } if (document.documentElement.getBoundingClientRect) { // IE var box = el.getBoundingClientRect(), round = Math.round; var rootNode = el.ownerDocument; return pos = { left: round(box.left + getDocumentScrollLeft(rootNode)), top: round(box.top + getDocumentScrollTop(rootNode)) }; } else { var pos = { left: el.offsetLeft, top: el.offsetTop }; var parentNode = el.offsetParent; // safari: subtract body offsets if el is abs (or any offsetParent), unless body is offsetParent var accountForBody = (_ygPos.browser == "safari" && el.offsetParent && el.style.position == "absolute" && el.offsetParent == el.ownerDocument.body); while (parentNode && parentNode != el) { if (parentNode.style.position != "static") { pos.left += parentNode.clientLeft; pos.top += parentNode.clientTop; } pos.left += parentNode.offsetLeft; pos.top += parentNode.offsetTop; if (!accountForBody && _ygPos.browser == "safari" && (parentNode.style.position == "absolute" || parentNode.style.position == "relative")) { accountForBody = true; } parentNode = parentNode.offsetParent; } if (accountForBody) { //safari doubles in this case pos.left -= el.ownerDocument.body.offsetLeft; pos.top -= el.ownerDocument.body.offsetTop; } parentNode = el.parentNode; // account for any scrolled ancestors while (parentNode && parentNode.tagName && !patterns.ROOT_TAG.test(parentNode.tagName)) { if (parentNode.scrollTop || parentNode.scrollLeft) { pos.left -= parentNode.scrollLeft; pos.top -= parentNode.scrollTop; } parentNode = parentNode.parentNode; } return pos; }; }
function IsPointInPolygon(point, polygon) {
if (polygon.feature != SuperMap.IS.FeatureType.polygon) {
return false;
}
// 判断是否在bounds内部。
var bounds = CalcBounds(polygon.points);
if (point.x < bounds.leftBottom.x || point.x > bounds.rightTop.x || point.y < bounds.leftBottom.y || point.y > bounds.rightTop.y) {
return false;
}
// 判断是否在边线上。
// 设点为Q，线段为P1P2 ，判断点Q在该线段上的依据是：( Q - P1 ) × ( P2 - P1 ) = 0 且 Q 在以 P1，P2为对角顶点的矩形内。前者保证Q点在直线P1P2上，后者是保证Q点不在线段P1P2的延长线或反向延长线上
var start = 0;
var p1;
var p2;
var isInLine = false;
for (var i = 0; i < polygon.parts.length; i++) {
for (var j = 0; j < polygon.parts[i]; j++) {
p1 = polygon.points[start + j];
if (j == polygon.parts[i] - 1) {
p2 = polygon.points[start];
}
else {
p2 = polygon.points[start + j + 1];
}
if (p1.x == p2.x && p1.y == p2.y) {
continue;
}
var cross = (point.x - p1.x) * (p2.y - p1.y) - (point.y - p1.y) * (p2.x - p1.x);
if (cross == 0) {
if (point.x <= Math.max(p1.x, p2.x) && point.x >= Math.min(p1.x, p2.x)
&& point.y <= Math.max(p1.y, p2.y) && point.y >= Math.min(p1.y, p2.y)) {
isInLine = true;
break;
}
}
}
if (isInLine) {
break;
}
start += polygon.parts[i];
}
if (isInLine) {
return true;
}
start = 0;
var oddNODES = false;
for (var p = 0; p < polygon.parts.length; p++) {
var polySides = polygon.parts[p];
var polyX = new Array(polySides);
var polyY = new Array(polySides);
var x = point.x;
var y = point.y;
var j = 0;
for (var i = 0; i < polySides; i++) {
polyX[i] = polygon.points[start + i].x;
polyY[i] = polygon.points[start + i].y;
}
for (var i = 0; i < polySides; i++) {
j++;
if (j == polySides) {
j = 0;
}
if ((polyY[i] < y && polyY[j] >= y) || (polyY[j] < y && polyY[i] >= y)) {
if (polyX[i] + (y - polyY[i]) / (polyY[j] - polyY[i]) * (polyX[j] - polyX[i]) < x) {
oddNODES = !oddNODES;
}
}
}
// 已经在某一部分的内部，所以不需要继续判断。
if (oddNODES) {
return oddNODES;
}
start += polySides;
}
return oddNODES;
};
网上找的代码(delphi)
Type
TMyPoint = packed record
X : double;
Y : double;
end;
{*------------------------------------------------------------------------------
判断指定的经纬度坐标点是否落在指定的多边形区域内
@param ALon 指定点的经度
@param ALat 指定点的纬度
@param APoints 指定多边形区域各个节点坐标
@return True 落在范围内 False 不在范围内
------------------------------------------------------------------------------*}
function IsPtInPoly(ALon, ALat: double; APoints: array of TMyPoint): Boolean;
var
iSum, iCount, iIndex: Integer;
dLon1, dLon2, dLat1, dLat2, dLon: double;
begin
Result := False;
if (Length(APoints) < 3) then
begin
Result := False;
Exit;
end;
iSum := 0;
iCount := Length(APoints);
for iIndex :=0 to iCount - 1 do
begin
if (iIndex = iCount - 1) then
begin
dLon1 := APoints[iIndex].X;
dLat1 := APoints[iIndex].Y;
dLon2 := APoints[0].X;
dLat2 := APoints[0].Y;
end
else
begin
dLon1 := APoints[iIndex].X;
dLat1 := APoints[iIndex].Y;
dLon2 := APoints[iIndex + 1].X;
dLat2 := APoints[iIndex + 1].Y;
end;
if ((ALat >= dLat1) and (ALat < dLat2)) or ((ALat>=dLat2) and (ALat < dLat1)) then
begin
if (abs(dLat1 - dLat2) > 0) then
begin
dLon := dLon1 - ((dLon1 -dLon2) * (dLat1 -ALat)) / (dLat1 - dLat2);
if (dLon < ALon) then
Inc(iSum);
end;
end;
end;
if (iSum mod 2 <> 0) then
Result := True;
end;
网上找的代码2（C#）
public bool IsPtInPoly(double ALon, double ALat, List<Point> APoints)
{
int iSum = 0, iCount;
double dLon1, dLon2, dLat1, dLat2, dLon;
if (APoints.Count < 3)
return false;
iCount = APoints.Count;
for (int i = 0; i < iCount - 1; i++)
{
if (i == iCount - 1)
{
dLon1 = APoints[i].X;
dLat1 = APoints[i].Y;
dLon2 = APoints[0].X;
dLat2 = APoints[0].Y;
}
else
{
dLon1 = APoints[i].X;
dLat1 = APoints[i].Y;
dLon2 = APoints[i + 1].X;
dLat2 = APoints[i + 1].Y;
}
//以下语句判断A点是否在边的两端点的水平平行线之间，在则可能有交点，开始判断交点是否在左射线上
if (((ALat >= dLat1) && (ALat < dLat2)) || ((ALat >= dLat2) && (ALat < dLat1)))
{
if (Math.Abs(dLat1 - dLat2) > 0)
{
//得到 A点向左射线与边的交点的x坐标：
dLon = dLon1 - ((dLon1 - dLon2) * (dLat1 - ALat)) / (dLat1 - dLat2);
// 如果交点在A点左侧（说明是做射线与 边的交点），则射线与边的全部交点数加一：
if (dLon < ALon)
iSum++;
}
}
}
if (iSum % 2 != 0)
return true;
return false;
}
有了这几个参考代码我想写这个判断的代码应该不是什么问题了～
