添加标注图层

在MapXtreme 2005中添加标注图层是非常容易的，只要知道要标准的表和相关的列，几行代码就搞定了，比想像中要容易多了。当然还有一些标注样式可以设置，可以从类库中查到相关的说明。
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代码:
/// <summary>

/// 添加标注图层

/// 2008年8月6日

/// <param name="tableName">标注的表名</param>

/// <param name="columnName">标注的列名</param>

/// </summary>

public static void ShowLabelLayer(string tableName, string columnName)

{

MapInfo.Mapping.Map myMap = MapInfo.Engine.Session.Current.MapFactory[MapControl1.MapAlias];



//新建标注图层

LabelLayer labelLayer = new LabelLayer();

myMap.Layers.Add(labelLayer);

//指定要标注的数据表

LabelSource labelSource = new LabelSource(MapInfo.Engine.Session.Current.Catalog.GetTable(tableName);

labelLayer.Sources.Append(labelSource);



//指定要标准字段所在的列

labelSource.DefaultLabelProperties.Caption = columnName;

//标注样式等属性

//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.Priority.Major = "index";

//source.DefaultLabelProperties.Layout.Offset = 7;

//source.DefaultLabelProperties.Layout.Alignment = MapInfo.Text.Alignment.BottomRight;

//Font font = new Font("黑体", 10);

//font.ForeColor = System.Drawing.Color.DarkBlue;

//source.DefaultLabelProperties.Style.Font = font;

}