MapXtreme 2005 学习心得一些基础函数代码(四)

xiaoxiao2022-07-08 207

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 /// by 路过秋天 /// <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 /// by 路过秋天 /// </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] /// by 路过秋天 /// <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 /// by 路过秋天 /// <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;

http://www.cnblogs.com/cyq1162/archive/2009/11/02/1594505.html

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MapXtreme 2005 学习心得 一些基础函数代码(四)

MapXtreme 2005 学习心得一些基础函数代码(四)