读取kml文件

注意2：该范例程序会调用Kml文件读取工具类：KmlUtil，支持读取对象包括：Point、LineString、Polygon，读取后的输出类型为：Placemark

（Kml文件读取工具类有试用时间限制和读取数量限制，请购买授权版控件以解除限制）

注意3：该范例程序会涉及三方程序集：SharpKml.dll，不需要引用，但必须添加至程序输出目录

using AZMap;

using AZMap.CommonTypes;

using AZMap.MapProviders;

using AZMap.Util;

using AZMap.WindowsForms;

using AZMap.WindowsForms.Markers;

using System;

using System.Collections.Generic;

using System.Drawing;

using System.Drawing.Drawing2D;

using System.Windows.Forms;

namespace WindowsFormsApplication1

{

public partial class Form1 : Form

{

// 对象绘制图层

private AZMapOverlay _graphicLayer = new AZMapOverlay("GRAPHIC_LAYER_" + Guid.NewGuid());

// 绘制时多边形的默认填充样式

public Brush DefaultPolygonFill;

// 绘制时多边形的默认线样式

public Pen DefaultPolygonStroke;

// 绘制时矩形的默认填充样式

public Brush DefaultRectangleFill;

// 绘制时矩形的默认线样式

public Pen DefaultRectangleStroke;

// 绘制时线的默认样式

public Pen DefaultRouteStroke;

public Form1()

{

InitializeComponent();

InitMapControl();

}

private void InitMapControl()

{

// 天地图2019年开始访问服务需要设置秘钥，若要使用天地图，请至官网申请开发许可

// http://lbs.tianditu.gov.cn/authorization/authorization.html

// 申请后，请修改输出目录的ConfigUser.xml文件里的KeyTianditu字段（软件默认设置了太乐地图申请的秘钥）

// 打开天地图卫星地图

MapControl.MapProvider = AZMapProviders.TiandituHybridMap3857;

// 设置鼠标左键拖动地图

MapControl.DragButton = MouseButtons.Left;

// 设置地图可以放大做小的最小级别和最大级别

MapControl.MinZoom = MapControl.MapProvider.MinZoom;

MapControl.MaxZoom = MapControl.MapProvider.MaxZoom == null ? 24 : (int)MapControl.MapProvider.MaxZoom;

// 设置初始化的级别和位置

MapControl.Zoom = 4;

MapControl.Position = new PointLatLng(35.1019340572461, 106.34765625); //定位在中国区域

// 在地图控件中对象绘制图层

MapControl.Overlays.Add(_graphicLayer);

// 设置地图控件的默认绘制样式

// 矩形

DefaultRectangleStroke = new Pen(Color.FromArgb(200, Color.Red))

{

Width = 3,

DashStyle = DashStyle.Dash

};

DefaultRectangleFill = new SolidBrush(Color.FromArgb(20, Color.Red));

// 多边形

DefaultPolygonStroke = new Pen(Color.FromArgb(200, Color.Red))

{

Width = 3,

DashStyle = DashStyle.Dash

};

DefaultPolygonFill = new SolidBrush(Color.FromArgb(20, Color.Red));

// 路径

DefaultRouteStroke = new Pen(Color.FromArgb(200, Color.Red))

{

Width = 3,

DashStyle = DashStyle.Solid

};

MapControl.DefaultRouteStroke = DefaultRouteStroke;

MapControl.DefaultRectangleStroke = DefaultRectangleStroke;

MapControl.DefaultRectangleFill = DefaultRectangleFill;

MapControl.DefaultPolygonStroke = DefaultPolygonStroke;

MapControl.DefaultPolygonFill = DefaultPolygonFill;

// 设置控件是否开启性能显示，开启后对象绘制会变快，但如果对象节点过多时不能进行鼠标交互

MapControl.FeaturesDispPerformanceEnabled = false;

}

/// <summary>

/// 打开kml文件

/// </summary>

/// <param name="sender"></param>

/// <param name="e"></param>

private void button1_Click(object sender, System.EventArgs e)

{

try

{

using (FileDialog dlg = new OpenFileDialog())

{

dlg.CheckPathExists = true;

dlg.CheckFileExists = false;

dlg.AddExtension = true;

dlg.ValidateNames = true;

dlg.Title = "选择文件（Kml格式）";

dlg.FilterIndex = 1;

dlg.RestoreDirectory = true;

dlg.Filter = "支持格式 (*.kml)|*.kml|Kml (*.kml)|*.kml";

if (dlg.ShowDialog() == DialogResult.OK)

{

if (dlg.FileName.EndsWith(".kml") || dlg.FileName.EndsWith(".Kml") || dlg.FileName.EndsWith(".KML"))

{

// 读取kml并绘制

DrawPlaceMarks(KmlUtil.GetPlaceMarksFromKmlFile(dlg.FileName));

}

catch (Exception ex)

{

MessageBox.Show(ex.Message);

}

/// <summary>

/// 解析kml的读取结果

/// </summary>

/// <param name="placeMarks"></param>

private void DrawPlaceMarks(List<KmlPlaceMark> placeMarks)

{

if (placeMarks == null || placeMarks.Count <= 0)

{

MessageBox.Show("未读取到任何数据！");

return;

}

var index = 0;

foreach (var placeMark in placeMarks)

{

index++;

// 绘制对象

DrawGeometry(placeMark.Geometry, index, placeMark.Name);

}

// 绘制完成后，定位到结果的中心位置

var bounds = new Polygon();

bounds.Points.AddRange(placeMarks[0].Geometry.Points);

var env = bounds.Envelope;

MapControl.SetZoomToFitRect(RectLatLng.FromLTRB(env.Left, env.Top, env.Right, env.Bottom));

MapControl.Position = new PointLatLng(env.Center.Y, env.Center.X);

}

/// <summary>

/// 最终的对象绘制方法

/// </summary>

/// <param name="geo">要绘制的对象</param>

/// <param name="index">索引号</param>

/// <param name="name">名称</param>

/// <param name="showToolTip">是否进行鼠标提示</param>

private void DrawGeometry(Geometry geo, int index, String name, bool showToolTip = true)

{

if (geo == null || geo.Points.Count == 0) return;

if (String.IsNullOrEmpty(name))

{

// 读取属性的中的名称好给Polygon命名，如果有的话

if (geo.Properties != null && geo.Properties.Count > 0)

{

if (geo.Properties.ContainsKey("Name"))

{

name = geo.Properties["Name"];

}

else if (geo.Properties.ContainsKey("name"))

{

name = geo.Properties["name"];

}

else if (geo.Properties.ContainsKey("NAME"))

{

name = geo.Properties["NAME"];

}

switch (geo.GeoType)

{

case GeometryType.Polygon:

{

// 绘制多边形

var finalName = String.IsNullOrEmpty(name) ? "polygon_" + index : name;

geo.Name = finalName;

var finalPolygon = new AZMapPolygon(geo.ToPointLatLngs(), finalName)

{

Stroke = DefaultPolygonStroke,

Fill = DefaultPolygonFill,

IsHitTestVisible = true,

Properties = geo.Properties

};

// 绘制鼠标提示

var area = String.Format("总面积：{0}平方千米", finalPolygon.Area.ToString("0.000000"));

var tooltipText = finalName + "\r\n" + area;

var marker = new AZMapMarkerEllipse(geo.Center.ToPointLatLngs()[0])

{

ToolTipText = tooltipText,

ToolTipMode = showToolTip ? MarkerTooltipMode.OnMouseOver : MarkerTooltipMode.Never

};

finalPolygon.ToolTipMarker = marker;

finalPolygon.ToolTipPosition = MapRouteToolTipPosition.Custom; // 鼠标提示画在矩形的中心点上

_graphicLayer.Polygons.Add(finalPolygon);

}

break;

case GeometryType.Polyline:

{

// 绘制线

var finalName = String.IsNullOrEmpty(name) ? "polyline_" + index : name;

geo.Name = finalName;

var line = new AZMapRoute(geo.ToPointLatLngs(), finalName)

{

Stroke = DefaultRouteStroke,

IsHitTestVisible = true,

Properties = geo.Properties

};

// 绘制鼠标提示

var length = String.Format("总长度：{0}千米", line.Distance.ToString("0.000000"));

var tooltipText = finalName + "\r\n" + length;

var ptCount = geo.Points.Count;

var centerIndex = ptCount / 2;

var center = geo.Points[centerIndex];

var marker = new AZMapMarkerEllipse(center.ToPointLatLngs()[0])

{

ToolTipText = tooltipText,

ToolTipMode = showToolTip ? MarkerTooltipMode.OnMouseOver : MarkerTooltipMode.Never

};

line.ToolTipMarker = marker;

line.ToolTipPosition = MapRouteToolTipPosition.Custom; // 鼠标提示画在多边形的中心点上

_graphicLayer.Routes.Add(line);

}

break;

case GeometryType.Point:

{

// 绘制点

var finalName = String.IsNullOrEmpty(name) ? "point_" + index : name;

geo.Name = finalName;

// AZMapMarkerGoogleType.pink_pushpin 为地标点的样式，可以随意指定

var marker = new AZMapMarkerGoogle(geo.ToPointLatLngs()[0], AZMapMarkerGoogleType.pink_pushpin)

{

IsHitTestVisible = true,

Properties = geo.Properties,

ToolTipText = finalName,

ToolTipMode = showToolTip ? MarkerTooltipMode.OnMouseOver : MarkerTooltipMode.Never

};

_graphicLayer.Markers.Add(marker);

}

break;

}