MapXtreme 2005 学习心得 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




Code




/**//// <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




Code




/**//// <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




Code




/**//// <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




Code




/**//// <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;