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MapInfo 开发实例：基础操作示例

一、创建图层

1. 创建图层函数代码：CreateLayer

public static void CreateLayer(string tableName, string layerName)
{
    MapInfo.Mapping.Map myMap = MapInfo.Engine.Session.Current.MapFactory[0];
    MapInfo.Mapping.FeatureLayer myLayer = new MapInfo.Mapping.FeatureLayer(table, layerName, layerName);
    myMap.Layers.Add(myLayer);
}

2. 添加点函数代码：AddPoint

public static void AddPoint(string layerName, DPoint dPoint, short shortCode, Color color)
{
    MapInfo.Mapping.Map myMap = MapInfo.Engine.Session.Current.MapFactory[0];
    FeatureLayer workLayer = myMap.Layers[layerName];
    FeatureGeometry point = new FeatureGeometry(workLayer.CoordSys, dPoint);
    // 设置样式
    Style style = new SimpleVectorPointStyle(shortCode, color, 20);
    CompositeStyle compositeStyle = new CompositeStyle(style);
    // 添加点
    Feature pointRow = new Feature(table.TableInfo.Columns);
    pointRow.Geometry = point;
    pointRow.Style = compositeStyle;
    pointRow["index"] = Random().Next(999);
    pointRow["value"] = "这是一个点";
    table.InsertFeature(pointRow);
}

3. 添加线函数代码：AddLine

public static void AddLine(string layerName, DPoint startPoint, DPoint endPoint, short shortCode, Color color)
{
    MapInfo.Mapping.Map myMap = MapInfo.Engine.Session.Current.MapFactory[0];
    FeatureLayer workLayer = myMap.Layers[layerName];
    FeatureGeometry line = MultiCurve.CreateLine(workLayer.CoordSys, startPoint, endPoint);
    // 设置样式
    Style lineStyle = new SimpleLineStyle(new LineWidth(3, LineWidthUnit.Pixel), shortCode, color);
    CompositeStyle compositeStyle = new CompositeStyle(lineStyle);
    // 添加线
    Feature lineRow = new Feature(table.TableInfo.Columns);
    lineRow.Geometry = line;
    lineRow.Style = compositeStyle;
    lineRow["index"] = Random().Next(999);
    lineRow["value"] = "这是一个线";
    table.InsertFeature(lineRow);
}

二、显示标注文本

1. 显示标注函数代码：ShowValue

public static void ShowValue(string tableName, string columnName)
{
    MapInfo.Mapping.Map myMap = MapInfo.Engine.Session.Current.MapFactory[0];
    // 创建标注图层
    LabelLayer labelLayer = new LabelLayer();
    myMap.Layers.Add(labelLayer);
    // 获取表
    Table table = MapInfo.Engine.Session.Current.Catalog.GetTable(tableName);
    // 绑定数据源
    LabelSource source = new LabelSource(table);
    // 设置显示的字段
    source.DefaultLabelProperties.Caption = columnName;
    // 添加到标注图层
    labelLayer.Sources.Append(source);
    // 加载数据
    source.Load();
    // 设置样式
    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;
    // 设置字体样式
    Font font = new Font("黑体", 12);
    font.ForeColor = System.Drawing.Color.Red;
    source.DefaultLabelProperties.Style.Font = font;
}

三、使用命名空间

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

通过以上代码示例，可以快速实现MapInfo环境下的基础操作，包括图层的创建、几何对象的添加以及标注的显示。这些代码可以整合到一个类中，记得添加必要的命名空间声明。

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