转载地址:http://blog.csdn.net/kkkkkxiaofei/article/details/8663377
C#调用百度地图API经验分享(四)
分类: GIS
2013-03-12 14:44
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这一篇,记录一下我调用的地图API实现的功能。下面介绍的都是一些片段的节选,不能直接复制就运行。在实现之前肯定要加载地图,先放一个webbroser控件,然后如下:
[csharp] view plain copy print ?
- private void Form1_Load(object sender, EventArgs e)
- {
-
- string str_url = Application.StartupPath + "\\最终合并版本(昨晚修改).html";
- Uri url = new Uri(str_url);
- webBrowser1.Url = url;
- webBrowser1.ObjectForScripting = this;
-
- }
而为了能与JS交互,首先引入using System.Security.Permissions;,然后在namespace下必须加入两行:
[csharp] view plain copy print ?
- 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 + "\\最终合并版本(昨晚修改).html";
- Uri url = new Uri(str_url);
- webBrowser1.Url = url;
- webBrowser1.ObjectForScripting = this;
-
- }
- }
有了上面的基础,就可以实现以下功能了。
1.鼠标放在屏幕上移动时,实时的显示坐标。
放入一个timer和一个StatusScrip:
[csharp] view plain copy print ?
- 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 ="当前坐标:"+ dou_lng.ToString("F5") + "," + dou_lat.ToString("F5");
- }
- }
- catch (Exception ee)
- { MessageBox.Show(ee.Message); }
-
- }
放入一个button命名及代码如下:
[csharp] view plain copy print ?
- private void btnGetLocation_Click(object sender, EventArgs e)
- {
- if (btnGetLocation.Text == "开启实时坐标")
- {
- timer1.Enabled = true;
- btnGetLocation.Text = "关闭实时坐标";
- }
- else
- {
- btnGetLocation.Text = "开启实时坐标";
- timer1.Enabled = false;
- }
- }
JS脚本如下:
[javascript] view plain copy print ?
- 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;
- }
- }
2.开启测距工具(百度自己开发的)
拖一个按钮:
[csharp] view plain copy print ?
-
- private void btnOpenDistance_Click(object sender, EventArgs e)
- {
- webBrowser1.Document.InvokeScript("openGetDistance");
- }
为了加载这个工具,是需要引入百度的另一个工具库:
JS如下:
[javascript] view plain copy print ?
- <script type="text/javascript" src="./JScript/DistanceTool_min.js"></script>
- function openGetDistance()
- {
- var myDis=new BMapLib.DistanceTool(map);
- myDis.open();
- }
//上面这个DistanceTool_min.js在百度的DEMO里有,我只是把它考到我的DEBUG下了,具体路径自己解决。
3.右击鼠标给地图上放marker,每一个marker的icon换成小汽车,并且显示坐标编号和坐标值,然后每放置一次,将数据存入数据库。
//放标注
[csharp] view plain copy print ?
- private void btnPutMarker_Click(object sender, EventArgs e)
- {
- if (radioButton1.Checked || radioButton2.Checked || radioButton3.Checked || radioButton4.Checked)
- webBrowser1.Document.InvokeScript("PUTANDSEND");
- else
- {
- MessageBox.Show("至少选择一项!");
- }
- }
-
- 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 汽车轨迹数据 values ('"+text_num.Text+"','"+text_index.Text+"','"+text_lng.Text+"','"+text_lat.Text+"','"+DateTime.Now.ToString()+"')";
- DBfunction.getcom(sql);
-
- }
JS脚本如下:
[javascript] view plain copy print ?
-
- 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+"号车-坐标"+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.根据上面已经模拟的汽车历史坐标,可以查询具体车辆的历史轨迹(即从数据库里提取数据,画轨迹)
[csharp] view plain copy print ?
- 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("您输入的不是数字,或者编号不在范围内!");
- }
- else
- {
- string getdata_sql = "select * from 汽车轨迹数据 where 汽车编号=" + text_whichCar.Text;
- whichCarData(getdata_sql);
- }
- }
//从数据库里的取出经纬度传送给JS
[csharp] view plain copy print ?
- 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("该车辆,无历史信息!");
- 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脚本如下:
//------------从后台数据库获得点集合来画轨迹(无参数版本),测试可用
[javascript] view plain copy print ?
- 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();
- }
5.打开绘图工具,这个工具可以画直线,圆,矩形等等,其中我这里用的主要是画圆的方法,画好圆后,可以得到哪些车辆在这个圆内,并将其标注出来(其实就是一个预警范围)。
//开启画图工具按钮
[csharp] view plain copy print ?
- private void btnDrawPicture_Click(object sender, EventArgs e)
- {
- if (radio_Circle.Checked)
- { webBrowser1.Document.InvokeScript("drawCircle"); }
- else
- { webBrowser1.Document.InvokeScript("drawRec"); }
- }
//搜索当前车辆位置,返回各个车辆的坐标
[csharp] view plain copy print ?
- public double SearchAllCars(int index)
- {
-
- string sql="select * from 汽车轨迹数据";
- 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; }
JS脚本如下:
[javascript] view plain copy print ?
- <!--加载鼠标绘制工具-->
- <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
- }
这个功能比较复杂,必须要加入前两行的库连接才可以。因为画圆可以得到圆心和半径,所以我只需要从数据库里取出点,然后一一测量其与圆心的距离,然后和半径比较,只要小于半径则就在圆内标注。起初头让我画矩形,画矩形的DEMO如下:
[javascript] view plain copy print ?
-
- 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 += ' 所画的点个数:' + e.overlay.getPath()[1].lng;
- alert(result);
- }
-
- };
这里是修改的百度DEMO,其中有一行result += ' 所画的点个数:' + e.overlay.getPath()[1].lng;在百度原有的demo里是这样写的result += ' 所画的点个数:' + e.overlay.getPath().length;只会返回一个数据,我仔细看了下函数名,getPath(),而且还有length的属性,那么肯定是数组,而且是返回的边或者点的个数,而边一定是由点组成的,根据之前的Ployline函数可以推测,这个函数必定是一个存放多边形点的数组,那么我就试了试e.overlay.getPath()[1].lng,看能不能取到某个点的经度值,果然不出我所料,可以的,当时兴奋了好一阵子,有了这个方法,矩形的四个点就都能记录,那么就可以跟数据库里取出的点直接进行经纬度比较,也可以标注预警范围,不过还是没有用圆方便。
由于时间确实很紧,手头还有事要做,只能写到这里了,欢迎交流,喷也行,哈哈。