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C#调用百度地图 api
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轉 ?http://blog.csdn.net/kkkkkxiaofei/article/details/8663377
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? 這一篇，記錄一下我調用的地圖API實現的功能。下面介紹的都是一些片段的節選，不能直接復制就運行。在實現之前肯定要加載地圖，先放一個webbroser控件，然后如下：
[csharp]?view plaincopyprint?
private?void?Form1_Load(object?sender,?EventArgs?e)??????????{????????????????string?str_url?=?Application.StartupPath?+?"\\最終合并版本(昨晚修改).html";??????????????Uri?url?=?new?Uri(str_url);??????????????webBrowser1.Url?=?url;??????????????webBrowser1.ObjectForScripting?=?this;???????????????????????????????}??
??? 而為了能與JS交互，首先引入using System.Security.Permissions;，然后在namespace下必須加入兩行：
[csharp]?view plaincopyprint?
namespace?WebBroser_Test_V1._0??{??????[PermissionSet(SecurityAction.Demand,?Name?=?"FullTrust")]????????[System.Runtime.InteropServices.ComVisibleAttribute(true)]??????????public?partial?class?Form1?:?Form??????{?????????????????public?Form1()??????????{??????????????InitializeComponent();??????????}??????????private?void?Form1_Load(object?sender,?EventArgs?e)??????????{????????????????string?str_url?=?Application.StartupPath?+?"\\最終合并版本(昨晚修改).html";??????????????Uri?url?=?new?Uri(str_url);??????????????webBrowser1.Url?=?url;??????????????webBrowser1.ObjectForScripting?=?this;?????????????????????}??}??
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有了上面的基礎，就可以實現以下功能了。
1.鼠標放在屏幕上移動時，實時的顯示坐標。
放入一個timer和一個StatusScrip：
[csharp]?view plaincopyprint?
private?void?timer1_Tick(object?sender,?EventArgs?e)??????????{??????????????try??????????????{??????????????????string?tag_lng?=?webBrowser1.Document.GetElementById("mouselng").InnerText;??????????????????string?tag_lat?=?webBrowser1.Document.GetElementById("mouselat").InnerText;??????????????????double?dou_lng,?dou_lat;??????????????????if?(double.TryParse(tag_lng,?out?dou_lng)?&&?double.TryParse(tag_lat,?out?dou_lat))??????????????????{??????????????????????toolstatus_CurrentLocation.Text?="當前坐標："+?dou_lng.ToString("F5")?+?","?+?dou_lat.ToString("F5");??????????????????}??????????????}??????????????catch?(Exception?ee)??????????????{?MessageBox.Show(ee.Message);?}??????????????????????}??
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放入一個button命名及代碼如下：
[csharp]?view plaincopyprint?
private?void?btnGetLocation_Click(object?sender,?EventArgs?e)?????????{?????????????if?(btnGetLocation.Text?==?"開啟實時坐標")?????????????{?????????????????timer1.Enabled?=?true;?????????????????btnGetLocation.Text?=?"關閉實時坐標";?????????????}?????????????else?????????????{?????????????????btnGetLocation.Text?=?"開啟實時坐標";?????????????????timer1.Enabled?=?false;?????????????}?????????}??
JS腳本如下：
[javascript]?view plaincopyprint?
var?map?=new?BMap.Map("allmap");??var?first_locate=new?BMap.Point(108.953098,34.2778);??map.centerAndZoom(first_locate,15);?????map.enableScrollWheelZoom(true);??map.addEventListener("mousemove",GetlngAndlat);?????function?GetlngAndlat(e)??{if(e.point.lng!=null)???{??????document.getElementById("mouselng").innerHTML=e.point.lng;????document.getElementById("mouselat").innerHTML=e.point.lat;???}??}??
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2.開啟測距工具（百度自己開發的）
拖一個按鈕：
[csharp]?view plaincopyprint?
????????private?void?btnOpenDistance_Click(object?sender,?EventArgs?e)??????????{??????????????webBrowser1.Document.InvokeScript("openGetDistance");??????????}??
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為了加載這個工具，是需要引入百度的另一個工具庫：
JS如下：
[javascript]?view plaincopyprint?
<script?type="text/javascript"?src="./JScript/DistanceTool_min.js"></script>??function?openGetDistance()??{???var?myDis=new?BMapLib.DistanceTool(map);?myDis.open();??}??
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//上面這個DistanceTool_min.js在百度的DEMO里有，我只是把它考到我的DEBUG下了，具體路徑自己解決。
3.右擊鼠標給地圖上放marker，每一個marker的icon換成小汽車，并且顯示坐標編號和坐標值，然后每放置一次，將數據存入數據庫。
//放標注
[csharp]?view plaincopyprint?
private?void?btnPutMarker_Click(object?sender,?EventArgs?e)?????????{?????????????if?(radioButton1.Checked?||?radioButton2.Checked?||?radioButton3.Checked?||?radioButton4.Checked)?????????????????webBrowser1.Document.InvokeScript("PUTANDSEND");?????????????else?????????????{?????????????????MessageBox.Show("至少選擇一項！");?????????????}?????????}????????????????public?string?setWhichCar()?????????{?????????????if?(radioButton1.Checked)?????????????????return?"1";?????????????if?(radioButton2.Checked)?????????????????return?"2";?????????????if?(radioButton3.Checked)?????????????????return?"3";?????????????if?(radioButton4.Checked)?????????????????return?"4";?????????????return?"Erro";?????????}????????????????public?void?PutIntotextBox(object?markerIndex,object?carNumber,object?JSlng,object?JSlat)?????????{?????????????text_index.Text?=markerIndex.ToString();?????????????text_num.Text?=?(string)carNumber;?????????????text_lng.Text?=?JSlng.ToString();?????????????text_lat.Text?=?JSlat.ToString();?????????????string?sql?=?"insert?into?汽車軌跡數據?values?('"+text_num.Text+"','"+text_index.Text+"','"+text_lng.Text+"','"+text_lat.Text+"','"+DateTime.Now.ToString()+"')";?????????????DBfunction.getcom(sql);??????????????????????}??
???????
JS腳本如下：
[javascript]?view plaincopyprint?
function?PUTANDSEND()??{????map.addEventListener("rightclick",putAndsend);??}??function?putAndsend(e)??{??????var?p1=new?BMap.Point(e.point.lng,e.point.lat);????var?marker?=?new?BMap.Marker(p1,{icon:myIcon});??map.addOverlay(marker);????marker_num++;??var?whichCar=window.external.setWhichCar();????var?label=new?BMap.Label(whichCar+"號車-坐標"+marker_num+":"+??"("+e.point.lng+","+e.point.lat+")",{offset:new?BMap.Size(20,-10)});????marker.setLabel(label);??????window.external.PutIntotextBox(marker_num,whichCar,e.point.lng,e.point.lat);??????}??
4.根據上面已經模擬的汽車歷史坐標，可以查詢具體車輛的歷史軌跡（即從數據庫里提取數據，畫軌跡）
[csharp]?view plaincopyprint?
private?void?btnDrawOrit_Click(object?sender,?EventArgs?e)??????????{??????????????string?ss?=?"^[0-9]*$";?????????????string?cc?=?text_whichCar.Text.Trim().ToString();??????????????bool?match?=?Regex.IsMatch(cc,?ss);??????????????if?(Convert.ToInt32(text_whichCar.Text)?>?4?||?!match||text_whichCar.Text.Trim().Equals(String.Empty))??????????????????????????{??????????????????MessageBox.Show("您輸入的不是數字，或者編號不在范圍內！");??????????????}??????????????else??????????????{??????????????????string?getdata_sql?=?"select?*?from?汽車軌跡數據?where?汽車編號="?+?text_whichCar.Text;??????????????????whichCarData(getdata_sql);??????????????}??????????}??
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//從數據庫里的取出經緯度傳送給JS
???????
[csharp]?view plaincopyprint?
public?void?whichCarData(string?limit_sql)?????????{???????????????????????OleDbDataReader?DR?=?DBfunction.getread(limit_sql);?????????????????ArrayList?a?=?new?ArrayList();?????????????????while?(DR.Read())?????????????????{?????????????????????a.Add(DR[2]);???????????????????a.Add(DR[3]);???????????????????Rows_Num++;?????????????????}?????????????????if?(Rows_Num?==?0)?????????????????????MessageBox.Show("該車輛，無歷史信息！");?????????????????else?????????????????{?????????????????????for?(int?i?=?0;?i?<=?2?*?Rows_Num?-?1;?i++)?????????????????????{?????????????????????????pointArr[i]?=?Convert.ToDouble(a[i]);?????????????????????}???????????????????????webBrowser1.Document.InvokeScript("DrawOrit1");?????????????????}?????????}??????????????????????public?int?getRowsNumber()?????????{?????????????return?Rows_Num;?????????}?????????public?double?Getpoints(int?index)?????????{?return?pointArr[index];?}??
JS腳本如下：
//------------從后臺數據庫獲得點集合來畫軌跡(無參數版本)，測試可用
[javascript]?view plaincopyprint?
function?DrawOrit1()??{???var?Array=[];??var?total_num=?window.external.getRowsNumber();??for(var?i=0;i<=2*total_num-1;i++)??{???Array.push(window.external.Getpoints(i));??}????var?PointArr=[];??for(var?i=0;i<=Array.length-1;i+=2)??{??PointArr.push(new?BMap.Point(Array[i],Array[i+1]));??}??var?polyline?=?new?BMap.Polyline(PointArr,?{strokeColor:"blue",?strokeWeight:6,???strokeOpacity:0.5});????map.addOverlay(polyline);??window.external.ClearRows_num();}??
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5.打開繪圖工具，這個工具可以畫直線，圓，矩形等等，其中我這里用的主要是畫圓的方法，畫好圓后，可以得到哪些車輛在這個圓內，并將其標注出來（其實就是一個預警范圍）。
//開啟畫圖工具按鈕
[csharp]?view plaincopyprint?
private?void?btnDrawPicture_Click(object?sender,?EventArgs?e)????????{????????????if?(radio_Circle.Checked)????????????{?webBrowser1.Document.InvokeScript("drawCircle");?}????????????else????????????{?webBrowser1.Document.InvokeScript("drawRec");?}????????}??
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?//搜索當前車輛位置,返回各個車輛的坐標
[csharp]?view plaincopyprint?
public?double?SearchAllCars(int?index)??????????{???????????????????????????string?sql="select?*?from?汽車軌跡數據";??????????????OleDbDataReader?dr=?DBfunction.getread(sql);?????????????ArrayList?allCars?=?new?ArrayList();??????????????while?(dr.Read())??????????????{??????????????????allCars.Add(dr[2]);??????????????????allCars.Add(dr[3]);??????????????}??????????????Danger_Num?=?allCars.Count;??????????????double[]?sendto_JS?=?new?double[allCars.Count];??????????????allCars.CopyTo(sendto_JS);???????????????????????????????return?sendto_JS[index];??????????}??????????public?int?GetdangerNum()??????????{?return?Danger_Num;?}??
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JS腳本如下：
[javascript]?view plaincopyprint?
<!--加載鼠標繪制工具-->??<script?type="text/javascript"?src="http://api.map.baidu.com/library/DrawingManager/1.4/src/DrawingManager_min.js"></script>??<link?rel="stylesheet"?href="http://api.map.baidu.com/library/DrawingManager/1.4/src/DrawingManager_min.css"?/>??????var?complete=function(e)?????{??????overlays.push(e.overlay);??????if?(e.drawingMode?==?BMAP_DRAWING_CIRCLE)?????????????{????????????????????????var?test=??window.external.SearchAllCars(0);?????????????????????????????????????var?circle_radius=e.overlay.getRadius();???????????????????var?circle_point=new?BMap.Point(e.overlay.getCenter().lng,e.overlay.getCenter().lat);????????????????????var?dangerCars=[];???????????var?pointlen=window.external.GetdangerNum();??????????????for(var?k=0;k<=pointlen-1;k++)????????????{???????????????dangerCars.push(window.external.SearchAllCars(k));????????????}???????????var?BMappoints=[];?????????for(var?j=0;j<=dangerCars.length-1;j+=2)????????????{??????????????BMappoints.push(new?BMap.Point(dangerCars[j],dangerCars[j+1]));????????????}????????????????????????for(var?i=0;i<=BMappoints.length-1;i++)????????????{??????????????if(map.getDistance(circle_point,BMappoints[i])<=circle_radius)??????????????{?????????????????AddMarker(BMappoints[i]);????????????}????????????????}??????????????????????}????????????????????};??????var?styleOptions?=?{??????????strokeColor:"blue",????????????fillColor:"blue",??????????????strokeWeight:?3,???????????????strokeOpacity:?1,????????????fillOpacity:?0.3,??????????????strokeStyle:?'solid'?????}??????????var?drawingManager?=?new?BMapLib.DrawingManager(map,?{??????????isOpen:?true,?????????enableDrawingTool:?true,?????????drawingToolOptions:?{??????????????anchor:?BMAP_ANCHOR_TOP_RIGHT,?????????????offset:?new?BMap.Size(5,?5),?????????????scale:?0.8,?????????????drawingTypes?:?[???????????????????????BMAP_DRAWING_CIRCLE,????????????????BMAP_DRAWING_RECTANGLE????????????]????????????},??????????circleOptions:?styleOptions,?????????rectangleOptions:?styleOptions?????});???????????????????????drawingManager.addEventListener('overlaycomplete',complete);?????????????????????????function?$(id){??????????return?document.getElementById(id);??????}????????????function?drawRec(){??drawingManager.setDrawingMode(BMAP_DRAWING_RECTANGLE);}???????????function?drawCircle(){??drawingManager.setDrawingMode(BMAP_DRAWING_CIRCLE);}??????????function?clearAll()?{??????????for(var?i?=?0;?i?<?overlays.length;?i++){??????????????map.removeOverlay(overlays[i]);??????????}??????????overlays.length?=?0??????}??
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??? 這個功能比較復雜，必須要加入前兩行的庫連接才可以。因為畫圓可以得到圓心和半徑，所以我只需要從數據庫里取出點，然后一一測量其與圓心的距離，然后和半徑比較，只要小于半徑則就在圓內標注。起初頭讓我畫矩形，畫矩形的DEMO如下：
[javascript]?view plaincopyprint?
????var?overlaycomplete?=?function(e){??????????overlays.push(e.overlay);??????????var?result?=?"";???????????????????result?+=?e.drawingMode?+?":";???????????????????if?(e.drawingMode?==?BMAP_DRAWING_CIRCLE)?{???????????????????????????var?circle_radius=e.overlay.getRadius();??????????????var?circle_point=new?BMap.Point(e.overlay.getCenter().lng,e.overlay.getCenter().lat);??????????????alert(map.getDistance(circle_point,tests[1]));???????????????for(var?i=0;i<3;i++)????????????{??????????????if(map.getDistance(circle_point,tests[i])<=circle_radius)??????????????{?????????????????AddMarker(tests[i]);??????????????}????????????????}??????????????alert(result);??????????}??????????if?(e.drawingMode?==?BMAP_DRAWING_POLYLINE?||?e.drawingMode?==?BMAP_DRAWING_POLYGON?||?e.drawingMode?==?BMAP_DRAWING_RECTANGLE)?{??????????????result?+=?'?所畫的點個數：'?+?e.overlay.getPath()[1].lng;??????????????alert(result);??????????}????????????????};??
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??? 這里是修改的百度DEMO，其中有一行result += ' 所畫的點個數：' + e.overlay.getPath()[1].lng;在百度原有的demo里是這樣寫的result += ' 所畫的點個數：' + e.overlay.getPath().length;只會返回一個數據，我仔細看了下函數名，getPath()，而且還有length的屬性，那么肯定是數組，而且是返回的邊或者點的個數，而邊一定是由點組成的，根據之前的Ployline函數可以推測，這個函數必定是一個存放多邊形點的數組，那么我就試了試e.overlay.getPath()[1].lng，看能不能取到某個點的經度值，果然不出我所料，可以的，當時興奮了好一陣子，有了這個方法，矩形的四個點就都能記錄，那么就可以跟數據庫里取出的點直接進行經緯度比較，也可以標注預警范圍，不過還是沒有用圓方便。
??? 由于時間確實很緊，手頭還有事要做，只能寫到這里了，歡迎交流，噴也行，哈哈。
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轉載于:https://www.cnblogs.com/hdu-edu/p/4207060.html
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