C#+MO实现一些渲染功能

  using System;

  using System.Drawing;

  using System.Collections;

  using System.ComponentModel;

  using System.Windows.Forms;

  using System.Data;

  namespace DbInMo

  {

  ///

  /// Form1 的摘要说明。

  ///

  public class 渲染示例 : System.Windows.Forms.Form

  {

  private AxMapObjects2.AxMap map;

  private System.Windows.Forms.Button 直方图;

  private System.Windows.Forms.Button 饼图;

  private System.Windows.Forms.Button 点密度;

  private System.Windows.Forms.Button 按值渲染;

  private System.Windows.Forms.Button 分类渲染;

  private System.Windows.Forms.Button Z值渲染;

  private System.Windows.Forms.Button 组渲染;

  private System.Windows.Forms.Button 退出;

  private System.Windows.Forms.Panel 操作板;

  private System.Windows.Forms.Button 删除所有渲染;

  private System.Windows.Forms.Panel panel1;

  private System.Windows.Forms.Button 全图;

  private System.Windows.Forms.Button 拖动;

  private System.Windows.Forms.Button 缩小;

  private System.Windows.Forms.Button 放大;

  private System.Windows.Forms.Panel 分隔符;

  private System.Windows.Forms.Button 标注渲染;

  ///

  /// 必需的设计器变量。

  ///

  private System.ComponentModel.Container components = null;

  public 渲染示例()

  {

  //

  // Windows 窗体设计器支持所必需的

  //

  InitializeComponent();

  //

  // TODO: 在 InitializeComponent 调用后添加任何构造函数代码

  //

  }

  ///

  /// 清理所有正在使用的资源。

  ///

  protected override void Dispose( bool disposing )

  {

  if( disposing )

  {

  if (components != null)

  {

  components.Dispose();

  }

  }

  base.Dispose( disposing );

  }

  #region Windows 窗体设计器生成的代码

  ///

  /// 设计器支持所需的方法 - 不要使用代码编辑器修改

  /// 此方法的内容。

  ///

  private void InitializeComponent()

  {

  System.Resources.ResourceManager resources = new System.Resources.ResourceManager(typeof(渲染示例));

  this.map = new AxMapObjects2.AxMap();

  this.操作板 = new System.Windows.Forms.Panel();

  this.直方图 = new System.Windows.Forms.Button();

  this.饼图 = new System.Windows.Forms.Button();

  this.点密度 = new System.Windows.Forms.Button();

  this.按值渲染 = new System.Windows.Forms.Button();

  this.分类渲染 = new System.Windows.Forms.Button();

  this.Z值渲染 = new System.Windows.Forms.Button();

  this.组渲染 = new System.Windows.Forms.Button();

  this.退出 = new System.Windows.Forms.Button();

  this.标注渲染 = new System.Windows.Forms.Button();

  this.删除所有渲染 = new System.Windows.Forms.Button();

  this.panel1 = new System.Windows.Forms.Panel();

  this.全图 = new System.Windows.Forms.Button();

  this.拖动 = new System.Windows.Forms.Button();

  this.缩小 = new System.Windows.Forms.Button();

  this.放大 = new System.Windows.Forms.Button();

  this.分隔符 = new System.Windows.Forms.Panel();

  ((System.ComponentModel.ISupportInitialize)(this.map)).BeginInit();

  this.操作板.SuspendLayout();

  this.SuspendLayout();

  //

  // map

  //

  this.map.Dock = System.Windows.Forms.DockStyle.Fill;

  this.map.Location = new System.Drawing.Point(0, 0);

  this.map.Name = "map";

  this.map.OcxState = ((System.Windows.Forms.AxHost.State)(resources.GetObject("map.OcxState")));

  this.map.Size = new System.Drawing.Size(616, 429);

  this.map.TabIndex = 0;

  this.map.MouseDownEvent += new AxMapObjects2._DMapEvents_MouseDownEventHandler(this.map_MouseDownEvent);

  //

  // 操作板

  //

  this.操作板.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D;

  this.操作板.Controls.Add(this.删除所有渲染);

  this.操作板.Controls.Add(this.panel1);

  this.操作板.Controls.Add(this.全图);

  this.操作板.Controls.Add(this.拖动);

  this.操作板.Controls.Add(this.缩小);

  this.操作板.Controls.Add(this.放大);

  this.操作板.Controls.Add(this.分隔符);

  this.操作板.Controls.Add(this.标注渲染);

  this.操作板.Controls.Add(this.退出);

  this.操作板.Controls.Add(this.组渲染);

  this.操作板.Controls.Add(this.Z值渲染);

  this.操作板.Controls.Add(this.分类渲染);

  this.操作板.Controls.Add(this.按值渲染);

  this.操作板.Controls.Add(this.点密度);

  this.操作板.Controls.Add(this.饼图);

  this.操作板.Controls.Add(this.直方图);

  this.操作板.Dock = System.Windows.Forms.DockStyle.Right;

  this.操作板.Location = new System.Drawing.Point(496, 0);

  this.操作板.Name = "操作板";

  this.操作板.Size = new System.Drawing.Size(120, 429);

  this.操作板.TabIndex = 1;

  //

  // 直方图

  //

  this.直方图.Dock = System.Windows.Forms.DockStyle.Top;

  this.直方图.Location = new System.Drawing.Point(0, 0);

  this.直方图.Name = "直方图";

  this.直方图.Size = new System.Drawing.Size(116, 24);

  this.直方图.TabIndex = 0;

  this.直方图.Text = "直方图";

  this.直方图.Click += new System.EventHandler(this.直方图_Click);

  //

  // 饼图

  //

  this.饼图.Dock = System.Windows.Forms.DockStyle.Top;

  this.饼图.Location = new System.Drawing.Point(0, 24);

  this.饼图.Name = "饼图";

  this.饼图.Size = new System.Drawing.Size(116, 24);

  this.饼图.TabIndex = 1;

  this.饼图.Text = "饼图";

  this.饼图.Click += new System.EventHandler(this.饼图_Click);

  //

  // 点密度

  //

  this.点密度.Dock = System.Windows.Forms.DockStyle.Top;

  this.点密度.Location = new System.Drawing.Point(0, 48);

  this.点密度.Name = "点密度";

  this.点密度.Size = new System.Drawing.Size(116, 23);

  this.点密度.TabIndex = 2;

  this.点密度.Text = "点密度";

  this.点密度.Click += new System.EventHandler(this.点密度_Click);

  //

  // 按值渲染

  //

  this.按值渲染.Dock = System.Windows.Forms.DockStyle.Top;

  this.按值渲染.Location = new System.Drawing.Point(0, 71);

  this.按值渲染.Name = "按值渲染";

  this.按值渲染.Size = new System.Drawing.Size(116, 23);

  this.按值渲染.TabIndex = 3;

  this.按值渲染.Text = "按值渲染";

  this.按值渲染.Click += new System.EventHandler(this.按值渲染_Click);

  //

  // 分类渲染

  //

  this.分类渲染.Dock = System.Windows.Forms.DockStyle.Top;

  this.分类渲染.Location = new System.Drawing.Point(0, 94);

  this.分类渲染.Name = "分类渲染";

  this.分类渲染.Size = new System.Drawing.Size(116, 23);

  this.分类渲染.TabIndex = 4;

  this.分类渲染.Text = "分类渲染";

  this.分类渲染.Click += new System.EventHandler(this.分类渲染_Click);

  //

  // Z值渲染

  //

  this.Z值渲染.Dock = System.Windows.Forms.DockStyle.Top;

  this.Z值渲染.Location = new System.Drawing.Point(0, 117);

  this.Z值渲染.Name = "Z值渲染";

  this.Z值渲染.Size = new System.Drawing.Size(116, 23);

  this.Z值渲染.TabIndex = 5;

  this.Z值渲染.Text = "Z值渲染";

  this.Z值渲染.Click += new System.EventHandler(this.Z值渲染_Click);

  //

  // 组渲染

  //

  this.组渲染.Dock = System.Windows.Forms.DockStyle.Top;

  this.组渲染.Location = new System.Drawing.Point(0, 140);

  this.组渲染.Name = "组渲染";

  this.组渲染.Size = new System.Drawing.Size(116, 23);

  this.组渲染.TabIndex = 6;

  this.组渲染.Text = "组渲染";

  this.组渲染.Click += new System.EventHandler(this.组渲染_Click);

  //

  // 退出

  //

  this.退出.Dock = System.Windows.Forms.DockStyle.Bottom;

  this.退出.Location = new System.Drawing.Point(0, 402);

  this.退出.Name = "退出";

  this.退出.Size = new System.Drawing.Size(116, 23);

  this.退出.TabIndex = 7;

  this.退出.Text = "退出";

  this.退出.Click += new System.EventHandler(this.退出_Click);

  //

  // 标注渲染

  //

  this.标注渲染.Dock = System.Windows.Forms.DockStyle.Top;

  this.标注渲染.Location = new System.Drawing.Point(0, 163);

  this.标注渲染.Name = "标注渲染";

  this.标注渲染.Size = new System.Drawing.Size(116, 23);

  this.标注渲染.TabIndex = 7;

  this.标注渲染.Text = "标注渲染";

  this.标注渲染.Click += new System.EventHandler(this.标注渲染_Click);

  //

  // 删除所有渲染

  //

  this.删除所有渲染.Dock = System.Windows.Forms.DockStyle.Top;

  this.删除所有渲染.Location = new System.Drawing.Point(0, 319);

  this.删除所有渲染.Name = "删除所有渲染";

  this.删除所有渲染.Size = new System.Drawing.Size(116, 23);

  this.删除所有渲染.TabIndex = 22;

  this.删除所有渲染.Text = "删除所有渲染";

  this.删除所有渲染.Click += new System.EventHandler(this.删除所有渲染_Click);

  //

  // panel1

  //

  this.panel1.Dock = System.Windows.Forms.DockStyle.Top;

  this.panel1.Location = new System.Drawing.Point(0, 299);

  this.panel1.Name = "panel1";

  this.panel1.Size = new System.Drawing.Size(116, 20);

  this.panel1.TabIndex = 21;

  //

  // 全图

  //

  this.全图.Dock = System.Windows.Forms.DockStyle.Top;

  this.全图.Location = new System.Drawing.Point(0, 276);

  this.全图.Name = "全图";

  this.全图.Size = new System.Drawing.Size(116, 23);

  this.全图.TabIndex = 20;

  this.全图.Text = "全图";

  this.全图.Click += new System.EventHandler(this.全图_Click);

  //

  // 拖动

  //

  this.拖动.Dock = System.Windows.Forms.DockStyle.Top;

  this.拖动.Location = new System.Drawing.Point(0, 253);

  this.拖动.Name = "拖动";

  this.拖动.Size = new System.Drawing.Size(116, 23);

  this.拖动.TabIndex = 19;

  this.拖动.Text = "拖动";

  this.拖动.Click += new System.EventHandler(this.拖动_Click);

  //

  // 缩小

  //

  this.缩小.Dock = System.Windows.Forms.DockStyle.Top;

  this.缩小.Location = new System.Drawing.Point(0, 230);

  this.缩小.Name = "缩小";

  this.缩小.Size = new System.Drawing.Size(116, 23);

  this.缩小.TabIndex = 18;

  this.缩小.Text = "缩小";

  this.缩小.Click += new System.EventHandler(this.缩小_Click);

  //

  // 放大

  //

  this.放大.Dock = System.Windows.Forms.DockStyle.Top;

  this.放大.Location = new System.Drawing.Point(0, 207);

  this.放大.Name = "放大";

  this.放大.Size = new System.Drawing.Size(116, 23);

  this.放大.TabIndex = 17;

  this.放大.Text = "放大";

  this.放大.Click += new System.EventHandler(this.放大_Click);

  //

  // 分隔符

  //

  this.分隔符.Dock = System.Windows.Forms.DockStyle.Top;

  this.分隔符.Location = new System.Drawing.Point(0, 186);

  this.分隔符.Name = "分隔符";

  this.分隔符.Size = new System.Drawing.Size(116, 21);

  this.分隔符.TabIndex = 16;

  //

  // 渲染示例

  //

  this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);

  this.ClientSize = new System.Drawing.Size(616, 429);

  this.Controls.Add(this.操作板);

  this.Controls.Add(this.map);

  this.Name = "渲染示例";

  this.Text = "渲染示例";

  this.WindowState = System.Windows.Forms.FormWindowState.Maximized;

  ((System.ComponentModel.ISupportInitialize)(this.map)).EndInit();

  this.操作板.ResumeLayout(false);

  this.ResumeLayout(false);

  }

  #endregion

  ///

  /// 应用程序的主入口点。

  ///

  [STAThread]

  static void Main()

  {

  Application.Run(new 渲染示例());

  }

  ///

  /// 退出系统

  ///

  private void 退出_Click(object sender, System.EventArgs e)

  {

  this.Close();

  }

  ///

  /// 图表渲染,值方图

  ///

  private void 直方图_Click(object sender, System.EventArgs e)

  {

  //直方图的例子中使用Lakers图层

  //

  //定义图标渲染变量

  MapObjects2.ChartRenderer cr = new MapObjects2.ChartRendererClass();

  //设置渲染类型为直方图

  cr.ChartType = MapObjects2.ChartTypeConstants.moBar;

  //设置直方图显示的字段个数为两个,就是直方图显示两个柱子

  cr.FieldCount = 2;

  //设置第一个字段,请参看lakes.dbf

  cr.set_Field(0,"SURF_ELEV");

  //设置这个直方图的柱子颜色为红色

  cr.set_Color(0,(uint)MapObjects2.ColorConstants.moRed);

  //设置第二个柱子

  cr.set_Field(1,"DEPTH");

  cr.set_Color(1,(uint)MapObjects2.ColorConstants.moGreen);

  MapObjects2.MapLayer lyr = (MapObjects2.MapLayer)(map.Layers.Item("lakes"));

  lyr.Renderer = cr;

  //使用Refresh()刷新老也是刷新不好,正没办法。。。,设为全图倒是不错的注意,^_^

  map.Refresh();

  }

  ///

  /// 全图视野

  ///

  private void 全图_Click(object sender, System.EventArgs e)

  {

  map.Extent = map.FullExtent;

  }

  ///

  /// 拖动,只设置图标

  ///

  private void 拖动_Click(object sender, System.EventArgs e)

  {

  map.MousePointer = MapObjects2.MousePointerConstants.moPan;

  }

  ///

  /// 缩小,只设置图标

  ///

  private void 缩小_Click(object sender, System.EventArgs e)

  {

  map.MousePointer = MapObjects2.MousePointerConstants.moZoomOut;

  }

  ///

  /// 放大,只设置图标

  ///

  private void 放大_Click(object sender, System.EventArgs e)

  {

  map.MousePointer = MapObjects2.MousePointerConstants.moZoomIn;

  }

  ///

  /// 鼠标按下时间,处理地图放大、缩小、拖动等。

  ///

  private void map_MouseDownEvent(object sender, AxMapObjects2._DMapEvents_MouseDownEvent e)

  {

  MapObjects2.Rectangle rect;

  MapObjects2.Point pt = map.ToMapPoint(e.x,e.y);

  if(e.button == 2)//右键点击取消

  {

  map.MousePointer = MapObjects2.MousePointerConstants.moDefault;

  }

  if(map.MousePointer == MapObjects2.MousePointerConstants.moPan)//拖动

  {

  map.Pan();

  }

  else if(map.MousePointer == MapObjects2.MousePointerConstants.moZoomIn)//放大

  {

  rect = map.TrackRectangle();

  if(rect == null|| (rect.Width < 0.00005) || (rect.Height < 0.00005))

  {

  rect = map.Extent;

  rect.ScaleRectangle(0.6667);

  rect.Offset(-(rect.Center.X - pt.X),-(rect.Center.Y - pt.Y));

  }

  map.Extent = rect;

  }

  else if(map.MousePointer == MapObjects2.MousePointerConstants.moZoomOut)//缩小

  {

  rect = map.TrackRectangle();

  if ((null == rect) || (rect.Width < 0.00005) || (rect.Height < 0.00005))

  {

  rect = map.Extent;

  rect.ScaleRectangle(1.5);

  rect.Offset(-(rect.Center.X - pt.X),-(rect.Center.Y - pt.Y));

  }

  else

  {

  double dRate = map.Extent.Width / rect.Width * 10;

  rect.ScaleRectangle(dRate);

  }

  map.Extent = rect;

  }

  }

  ///

  /// 图表渲染,使用饼图

  ///

  private void 饼图_Click(object sender, System.EventArgs e)

  {

  //饼图的例子中使用Lakers图层

  //过程和直方图一样

  //

  //定义图标渲染变量

  MapObjects2.ChartRenderer cr = new MapObjects2.ChartRendererClass();

  //设置渲染类型为饼图

  cr.ChartType = MapObjects2.ChartTypeConstants.moPie;

  //设置饼图显示的字段个数为两个,就是饼图显示两半

  cr.FieldCount = 2;

  //设置第一个字段,请参看lakes.dbf

  cr.set_Field(0,"SURF_ELEV");

  //设置这个饼图的一半颜色为红色

  cr.set_Color(0,(uint)MapObjects2.ColorConstants.moRed);

  //设置第二半

  cr.set_Field(1,"DEPTH");

  cr.set_Color(1,(uint)MapObjects2.ColorConstants.moGreen);

  //添加到地图上

  MapObjects2.MapLayer lyr = (MapObjects2.MapLayer)(map.Layers.Item("lakes"));

  lyr.Renderer = cr;

  //刷新

  map.Refresh();

  }

  ///

  /// 点密度渲染

  ///

  private void 点密度_Click(object sender, System.EventArgs e)

  {

  //点密度的例子中使用lakes图层

  //

  //定义点密度渲染变量

  MapObjects2.DotDensityRenderer ddr = new MapObjects2.DotDensityRendererClass();

  //设置渲染的数据字段,请参看lakes.dbf

  ddr.Field = "DEPTH";

  //点大小

  ddr.DotSize = 3;

  //点颜色

  ddr.DotColor = (uint)MapObjects2.ColorConstants.moBlue;

  ddr.DotValue = 1;

  ddr.DrawBackground = true;

  //添加到地图上

  MapObjects2.MapLayer lyr = (MapObjects2.MapLayer)(map.Layers.Item("lakes"));

  lyr.Renderer = ddr;

  //刷新

  map.Refresh();

  }

  ///

  /// 按值渲染

  ///

  private void 按值渲染_Click(object sender, System.EventArgs e)

  {

  //按值渲染的例子中使用country图层,这里利用按值渲染,将每个国家用不同的颜色显示

  //

  //字符串s变量,很像Delphi中的TStringList,^_^

  MapObjects2.Strings strs = new MapObjects2.StringsClass();

  //图层变量,引用country图层

  MapObjects2.MapLayer lyr = (MapObjects2.MapLayer)map.Layers.Item("country");

  //Recordset对象,我将在以后的文章中陆续讲解关于MapObjects2.2中使用数据集变量的内容!!!

  //使用方法大致与VB中对数据表的操作差不多。

  MapObjects2.Recordset rc = lyr.Records;

  //这个循环获取所有国家的简称代码列表

  while(!rc.EOF)

  {

  strs.Add(rc.Fields.Item("FIPS_CODE").ValueAsString);

  rc.MoveNext();

  }

  //定义按值渲染对象

  MapObjects2.ValueMapRenderer vmr = new MapObjects2.ValueMapRendererClass();

  //将其添加到图层

  lyr.Renderer = vmr;

  //设置渲染使用的字段,请参看country.dbf文件

  vmr.Field = "FIPS_CODE";

  //渲染的个数

  vmr.ValueCount = strs.Count;

  //缺省值

  vmr.UseDefault = true;

  MapObjects2.Symbol sym = vmr.DefaultSymbol;

  sym.Color = (uint)MapObjects2.ColorConstants.moYellow;//缺省颜色为黄色

  //渲染过程

  for(int i=0;i

  {

  vmr.set_Value((short)i,strs.Item((short)i));

  }

  //刷新

  map.Refresh();

  }

  ///

  /// 分类渲染

  ///

  private void 分类渲染_Click(object sender, System.EventArgs e)

  {

  //分类渲染的例子使用country图层

  //

  //图层变量引用cities层

  MapObjects2.MapLayer lyr = (MapObjects2.MapLayer)(map.Layers.Item("cities"));

  //定义分类渲染变量

  MapObjects2.ClassBreaksRenderer cbr = new MapObjects2.ClassBreaksRendererClass();

  //添加到地图

  lyr.Renderer = cbr;

  //设置符号类型为点,也可使用其他类型,请自己试验,方法大概都差不多

  cbr.SymbolType = MapObjects2.SymbolTypeConstants.moPointSymbol;

  //设置字段,请参看cities.dbf文件

  cbr.Field = "POPULATION";

  //Statistics对象经常配合分类渲染使用,他表示用一个Recordset对象的CalculateStatistics方法

  // 对一个数值字段的统计计算结果

  MapObjects2.Statistics stat = lyr.Records.CalculateStatistics("POPULATION");

  //Mean——平均值,StdDev——均方差

  double fbv = stat.Mean - (stat.StdDev * 3);

  for(int i=0;i<6;i++)

  {

  if((fbv >= stat.Min)&&fbv <= stat.Max)

  {

  //分类个数,依次加一

  cbr.BreakCount = (short)(cbr.BreakCount + 1);

  //设置分类

  cbr.set_Break((short)(cbr.BreakCount - 1),fbv);

  }

  fbv += stat.StdDev;

  }

  //SizeSymbols方法制定头尾的大小用来表现点特征大小渐进效果

  cbr.SizeSymbols(3,8);

  //RampColors方法设置颜色从白色到红色的渐进显示

  cbr.RampColors((uint)MapObjects2.ColorConstants.moWhite,(uint)MapObjects2.ColorConstants.moRed);

  //刷新

  map.Refresh();

  }

  ///

  /// Z值渲染

  ///

  private void Z值渲染_Click(object sender, System.EventArgs e)

  {

  //本来想好好搞搞,可是我找不到带有Z值的地图,哈哈,认了吧,下面给出基本的语句,有兴趣的

  //兄弟姐妹们可以自己试试

  // MapObjects2.ZRenderer zr = new MapObjects2.ZRendererClass();

  // //Z值分成几部分?

  // zr.BreakCount = 2;

  // //设置各个部分的分界线

  // zr.set_Break(0,100);

  // zr.set_Break(1,1000);

  // //设置特征类型

  // zr.SymbolType = MapObjects2.SymbolTypeConstants.moPointSymbol;

  // MapObjects2.Symbol sym;

  // for(short i=0;i

  // {

  // //获取特征

  // sym = zr.get_Symbol(i);

  // //设置特征属性,定义一个颜色数组,将不同特征设置不同颜色,效果会明显些

  // sym.Color = (uint)MapObjects2.ColorConstants.moRed;

  // sym.Size = 6;

  // sym.Style = MapObjects2.MarkerStyleConstants.moTriangleMarker;

  // }

  // //添加到地图

  // MapObjects2.MapLayer lyr = (MapObjects2.MapLayer)map.Layers.Item("带有Z值的图层名称");

  // lyr.Renderer = zr;

  // //刷新

  // map.Refresh();

  }

  ///

  /// 组渲染

  ///

  private void 组渲染_Click(object sender, System.EventArgs e)

  {

  //组渲染其实就是组合渲染,一般定义多个渲染方式,然后使用如下的语句进行组合

  MapObjects2.MapLayer lyr = (MapObjects2.MapLayer)map.Layers.Item("country");

  //标注渲染

  MapObjects2.LabelRenderer lr = new MapObjects2.LabelRendererClass();

  lr.Field = "NAME";

  lr.get_Symbol(0).Color = (uint)MapObjects2.ColorConstants.moBlack;

  lr.get_Symbol(0).Font.Size = 8;

  //按值渲染

  MapObjects2.Strings strs = new MapObjects2.StringsClass();

  MapObjects2.Recordset rc = lyr.Records;

  while(!rc.EOF)

  {

  strs.Add(rc.Fields.Item("FIPS_CODE").ValueAsString);

  rc.MoveNext();

  }

  MapObjects2.ValueMapRenderer vmr = new MapObjects2.ValueMapRendererClass();

  vmr.Field = "FIPS_CODE";

  vmr.ValueCount = strs.Count;

  vmr.UseDefault = true;

  MapObjects2.Symbol sym = vmr.DefaultSymbol;

  sym.Color = (uint)MapObjects2.ColorConstants.moYellow;

  for(int i=0;i

  {

  vmr.set_Value((short)i,strs.Item((short)i));

  }

  //将二者组合,添加到图层

  MapObjects2.GroupRenderer gr = new MapObjects2.GroupRendererClass();

  gr.Add(vmr);

  gr.Add(lr);

  lyr.Renderer = gr;

  map.Refresh();

  }

  ///

  /// 删除所有渲染

  ///

  private void 删除所有渲染_Click(object sender, System.EventArgs e)

  {

  MapObjects2.MapLayer lyr;

  for(int i=0;i

  {

  lyr = (MapObjects2.MapLayer)map.Layers.Item(i);

  lyr.Renderer = new MapObjects2.LabelRendererClass();

  map.Refresh();

  }

  }

  ///

  /// 标注渲染

  ///

  private void 标注渲染_Click(object sender, System.EventArgs e)

  {

  MapObjects2.MapLayer lyr = (MapObjects2.MapLayer)map.Layers.Item("cities");

  MapObjects2.LabelRenderer lr = new MapObjects2.LabelRendererClass();

  lr.Field = "NAME";

  lr.get_Symbol(0).Color = (uint)MapObjects2.ColorConstants.moBlack;

  lr.get_Symbol(0).Font.Size = 8;

  lyr.Renderer = lr;

  map.Refresh();

  }

  }

  }