MapXtreme 2005 一些基础函数代码(四)

网上看到的基本上代码都大同小异,经过本人小小修改或未修改的代码如下:

 一：先创建图层

1：创建图层函数代码：CreateLayer

 <summary>    /// 创建临时图层    /// <param name="tableName">表名</param>    /// <param name="layerName">图层名</param>    /// </summary>    public static void CreateLayer(string tableName, string layerName)    {        MapInfo.Mapping.Map myMap = MapInfo.Engine.Session.Current.MapFactory[0];//取得当前地图        //建立内存表信息(TableInfo中的一种,所以当然还有其它很多种表类型)        MapInfo.Data.TableInfoMemTable tblInfo = new MapInfo.Data.TableInfoMemTable(tableName);        //向表信息中添加可绘图列(必备的列)        tblInfo.Columns.Add(MapInfo.Data.ColumnFactory.CreateFeatureGeometryColumn(myMap.GetDisplayCoordSys()));        tblInfo.Columns.Add(MapInfo.Data.ColumnFactory.CreateStyleColumn());        //向表信息中添加其它数据列(可选的列)        tblInfo.Columns.Add(MapInfo.Data.ColumnFactory.CreateIntColumn("index"));//创建整形的列，当然还有其它日期型的,doule型的等等        tblInfo.Columns.Add(MapInfo.Data.ColumnFactory.CreateStringColumn("value", 20));//创建字符串型的列,并指定长度        //确保当前目录下不存在同名表        MapInfo.Data.Table table = MapInfo.Engine.Session.Current.Catalog.GetTable(tableName);        if (table != null)        {            MapInfo.Engine.Session.Current.Catalog.CloseTable(tableName);        }        //根据表信息创建临时表        table = MapInfo.Engine.Session.Current.Catalog.CreateTable(tblInfo);        //创建图层(并关联表)        FeatureLayer tempLayer = new FeatureLayer(table, layerName, layerName);                myMap.Layers.Add(tempLayer);

二：在图层的基础上，创建点，线，或其它图型

1：创建点函数代码：AddPoint

<summary>    /// 添加点    /// </summary>    /// <param name="layerName">图层名称</param>    /// <param name="dPoint">点的坐标</param>    /// <param name="shortCode">点的代码,不同的数字有不同的形状(圆型，三角型，正方型等)</param>    /// <param name="color">点的颜色</param>    public static void AddPoint(string layerName, DPoint dPoint, short shortCode, Color color)    {        MapInfo.Mapping.Map myMap = MapInfo.Engine.Session.Current.MapFactory[0];        //获取图层和表        FeatureLayer workLayer = (MapInfo.Mapping.FeatureLayer)myMap.Layers[layerName];        MapInfo.Data.Table table = workLayer.Table;        //创建点        FeatureGeometry point = new MapInfo.Geometry.Point(workLayer.CoordSys, dPoint);        //以下两行是图形的样式        MapInfo.Styles.SimpleVectorPointStyle spsPoint = new MapInfo.Styles.SimpleVectorPointStyle(shortCode, color, 20);        MapInfo.Styles.CompositeStyle pointStyle = new MapInfo.Styles.CompositeStyle(spsPoint);        //接下来创建一行数据        MapInfo.Data.Feature pointRow = new MapInfo.Data.Feature(table.TableInfo.Columns);        pointRow.Geometry = point;//必备列[图形]        pointRow.Style = pointStyle;//必备列[图形样式]        pointRow["index"] = new Random().Next(999);        pointRow["value"] = "this is a point";        //将一行数据放入表中        table.InsertFeature(pointRow);    }

说明：
关于shortCode:
参考C:\Program Files\MapInfo\MapXtreme\6.7.1\Documentation\PDF\MapXtreme2005_DevGuide.pdf
下的Appendix G:Style Lookups(附录G，样式查找)下的Vector Symbols(矢量符号)->Map Symbols （地图符号）

2：创建线函数代码：AddLine

/// <summary>    /// 添加线[代码和创建点的相差无几]    /// <param name="layerName">图层名</param>    /// <param name="startPoint">线段起点坐标</param>    /// <param name="endPoint">线段终点坐标</param>    /// <param name="shortCode">线的shortCode(线的型状也有多种，比如单箭头，双箭头等)</param>    /// <param name="color">线的颜色</param>    /// </summary>    public static void AddLine(string layerName, DPoint startPoint, DPoint endPoint, int shortCode, Color color)    {        MapInfo.Mapping.Map myMap = MapInfo.Engine.Session.Current.MapFactory[0];        //获取图层和表        FeatureLayer workLayer = (MapInfo.Mapping.FeatureLayer)myMap.Layers[layerName];        MapInfo.Data.Table table = workLayer.Table;        //创建线        FeatureGeometry line = MultiCurve.CreateLine(workLayer.CoordSys, startPoint, endPoint);        //以下两行是图形的样式        MapInfo.Styles.SimpleLineStyle slsLine = new MapInfo.Styles.SimpleLineStyle(new LineWidth(3, LineWidthUnit.Pixel), shortCode, color);        MapInfo.Styles.CompositeStyle lineStyle = new MapInfo.Styles.CompositeStyle(slsLine);        //接下来创建一行数据        MapInfo.Data.Feature ptLine = new MapInfo.Data.Feature(table.TableInfo.Columns);        ptLine.Geometry = line;        ptLine.Style = lineStyle;        ptLine["index"] = new Random().Next(999); ;        ptLine["value"] = "this is a line";        //将线图元加入图层        table.InsertFeature(ptLine);    }

三：显示标注文本

1：显示标注文本函数代码：ShowValue

 /// <summary>    /// 显示标注    /// <param name="tableName">标注的表名</param>    /// <param name="columnName">标注的列名</param>    /// </summary>    public static void ShowValue(string tableName, string columnName)    {        MapInfo.Mapping.Map myMap = MapInfo.Engine.Session.Current.MapFactory[0];        //新建标注图层并绑定数据(整个过程有点像DataGrid控件指定数据源控件SqlDataSource，而数据源控件又绑定了DataTable)        LabelLayer labelLayer = new LabelLayer();        myMap.Layers.Add(labelLayer);        //指定要标注的数据表        MapInfo.Data.Table table = MapInfo.Engine.Session.Current.Catalog.GetTable(tableName);        LabelSource source = new LabelSource(table);//绑定Table        labelLayer.Sources.Append(source);//加载指定数据        //指定哪个字段作为显示标注(在非必备的自定义列里挑一个，比如我们就挑"value"列)        source.DefaultLabelProperties.Caption = columnName;        //标注样式等属性,注意这段注释的代码，是指在一定的缩放比例范围内才显示文本,要是不注释掉,可能折腾半天也看不到为啥显示不出来文本        //source.DefaultLabelProperties.Visibility.Enabled = true;        //source.DefaultLabelProperties.Visibility.VisibleRangeEnabled = true;        //source.DefaultLabelProperties.Visibility.VisibleRange = new VisibleRange(0.01, 10, MapInfo.Geometry.DistanceUnit.Mile);        source.DefaultLabelProperties.Visibility.AllowDuplicates = true;        source.DefaultLabelProperties.Visibility.AllowOverlap = true;        source.DefaultLabelProperties.Visibility.AllowOutOfView = true;        source.Maximum = 50;        source.DefaultLabelProperties.Layout.UseRelativeOrientation = true;        source.DefaultLabelProperties.Layout.RelativeOrientation = MapInfo.Text.RelativeOrientation.FollowPath;        source.DefaultLabelProperties.Layout.Angle = 33.0;        source.DefaultLabelProperties.Layout.Offset = 7;        source.DefaultLabelProperties.Layout.Alignment = MapInfo.Text.Alignment.CenterCenter;        MapInfo.Styles.Font font = new MapInfo.Styles.Font("黑体", 12);        font.ForeColor = System.Drawing.Color.Red;        source.DefaultLabelProperties.Style.Font = font;    }

先上这四个最基本的函数，如果把这几个函数放一个类中，别忘了加名称空间

using MapInfo.Geometry;using MapInfo.Mapping;using MapInfo.Styles;using MapInfo.Data;using MapInfo.Text;using System.Drawing;