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
{
     /// <summary>
     /// form1 的摘要说明。
     /// </summary>
     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;
         /// <summary>
         /// 必需的设计器变量。
         /// </summary>
          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
              //
         }
         /// <summary>
         /// 清理所有正在使用的资源。
         /// </summary>
          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
         /// <summary>
         /// 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。
         /// </summary>
          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
         /// <summary>
         /// 应用程序的主入口点。
         /// </summary>
          [stathread]
         static void main() 
         {
              application.run(new 渲染示例());
         }
         /// <summary>
         /// 退出系统
         /// </summary>
          private void 退出_click(object sender, system.eventargs e)
         {
              this.close();
         }
         /// <summary>
         /// 图表渲染，值方图
         /// </summary>
          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();
         }
         /// <summary>
         /// 全图视野
         /// </summary>
          private void 全图_click(object sender, system.eventargs e)
         {
              map.extent = map.fullextent;
         }
         /// <summary>
         /// 拖动，只设置图标
         /// </summary>
          private void 拖动_click(object sender, system.eventargs e)
         {
              map.mousepointer = mapobjects2.mousepointerconstants.mopan;
         }
         /// <summary>
         /// 缩小，只设置图标
         /// </summary>
          private void 缩小_click(object sender, system.eventargs e)
         {
              map.mousepointer = mapobjects2.mousepointerconstants.mozoomout;
         }
         /// <summary>
         /// 放大，只设置图标
         /// </summary>
          private void 放大_click(object sender, system.eventargs e)
         {
              map.mousepointer = mapobjects2.mousepointerconstants.mozoomin;
         }
         /// <summary>
         /// 鼠标按下时间，处理地图放大、缩小、拖动等。
         /// </summary>
          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;
              }
          }
         /// <summary>
         /// 图表渲染，使用饼图
         /// </summary>
          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();      
         }
         /// <summary>
         /// 点密度渲染
         /// </summary>
          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();
         }
         /// <summary>
         /// 按值渲染
         /// </summary>
          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.valuecount;i++)
              {
                   vmr.set_value((short)i,strs.item((short)i));
              }
              //刷新
              map.refresh();
         }
         /// <summary>
         /// 分类渲染
         /// </summary>
          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();
         }
         /// <summary>
         /// z值渲染
         /// </summary>
          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<zr.breakcount;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();
         }
        /// <summary>
        /// 组渲染
        /// </summary>
        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.valuecount;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();
         }
         /// <summary>
         /// 删除所有渲染
         /// </summary>
          private void 删除所有渲染_click(object sender, system.eventargs e)
         {
              mapobjects2.maplayer lyr;
              for(int i=0;i<map.layers.count;i++)
              {
                   lyr = (mapobjects2.maplayer)map.layers.item(i);
                   lyr.renderer = new mapobjects2.labelrendererclass();
                   map.refresh();
              }
         }
         /// <summary>
         /// 标注渲染
         /// </summary>
          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();
         }
     }
}