mapxtreme编程_判断点是否在面内_mapxtreme

1 设置图层可选状态

/**//// <summary>

/// 改变层的可选择状态

/// </summary>

/// <param></param>

/// <returns></returns>

public bool LayerSelectableStatusUpdate(string tableAlias,bool selectableStatus)

{

if(mapControl1.Map.Layers[tableAlias]==null)

return false;

MapInfo.Mapping.LayerHelper.SetSelectable(mapControl1.Map.Layers[tableAlias],selectableStatu

s);

return true;

}

2 设置层的可用状态

/**//// <summary>

/// 改变层的可用状态为status

/// </summary>

/// <param></param>

/// <param></param>

public void LayerEnableStatusUpdate(string layerName,bool status)

{

if(mapControl1.Map.Layers[layerName]!=null && mapControl1.Map.Layers[layerName].Enabled!

=status)

{

mapControl1.Map.Layers[layerName].Enabled=status;

}

}

3 层居中，看全图

/**//// <summary>

/// 使指定层全部呈现在地图的可见范围中

/// </summary>

/// <param>层别名</param>

public void LayerCenter(string layerName)

{

MapInfo.Data.Table[] tables=new MapInfo.Data.Table[1];

tables[0] = MapInfo.Engine.Session.Current.Catalog.GetTable(layerName);

if(tables[0]==null)

return;

if(mapControl1.Map.Layers[layerName]==null)

return;

if(mapControl1.Map.Layers[layerName].Enabled == false)

mapControl1.Map.Layers[layerName].Enabled = true;

MapInfo.Mapping.IMapLayerFilter iMapLayerFilter =

MapInfo.Mapping.MapLayerFilterFactory.FilterByTable(tables);

MapInfo.Mapping.MapLayerEnumerator mapLayerEnumerator =

mapControl1.Map.Layers.GetMapLayerEnumerator(iMapLayerFilter);

mapControl1.Map.SetView(mapLayerEnumerator);

OnFeatureUnclick();

}

4 放大缩小地图

/**//// <summary>

/// 放大地图

/// </summary>

/// <param>放大倍数，有效值1－10</param>

public void ZoomIn(uint times)

{

if(times<1 || times>10) return;

MapInfo.Geometry.Distance previousZoom=this.mapControl1.Map.Zoom;

mapControl1.Map.Zoom=new MapInfo.Geometry.Distance(previousZoom.Value/

(2*times),previousZoom.Unit);

}

/**//// <summary>

/// 缩小地图

/// </summary>

/// <param>缩小倍数,有效值1－10</param>

public void ZoomOut(uint times)

{

if(times<1 || times>10) return;

MapInfo.Geometry.Distance previousZoom=this.mapControl1.Map.Zoom;

mapControl1.Map.Zoom=new MapInfo.Geometry.Distance(previousZoom.Value*

(2*times),previousZoom.Unit);

}

5 移动层的顺序

mapControl1.Map.Layers.Move(index1,index2);

6 图元/图层透明

/**//// <summary>

/// 设置层的透明与否

/// </summary>

/// <param>层名</param>

/// <param>不透明类型 ALL 全部不透明 BORDER 只有边界不透明（内部透明）

NONE 全部透明</param>

/// <param>如果是边界不透明，此处设置边界颜色</param>

public void LayerTransparent(string layerName,OpaqueType opaqueType,System.Drawing.Color

borderColor)

{

MapInfo.Styles.CompositeStyle compositeStyle = GetOpaqueStyle(opaqueType,borderColor);

//创建连接和命令来更新table中的数据

MapInfo.Data.MIConnection connection=new MapInfo.Data.MIConnection();

connection.Open();

MapInfo.Data.MICommand command=connection.CreateCommand();

command.CommandText = "update " + layerName + " set obj=obj,MI_Style=@style";

command.Parameters.Add("@style",compositeStyle);

command.Prepare();

command.ExecuteNonQuery();

//关闭连接

command.Cancel();

command.Dispose();

connection.Close();

connection.Dispose();

}

/**//// <summary>

/// 创建style

/// </summary>

/// <param>不透明类型：ALL全部不透明（白色实心）；BORDER边界不透明（填充部

分透明）；NONE全透明</param>

/// <param>如果opaqueType=BORDER，此处设定边界颜色</param>

/// <returns>组合style</returns>

private MapInfo.Styles.CompositeStyle GetOpaqueStyle(OpaqueType

opaqueType,System.Drawing.Color borderColor)

{

MapInfo.Styles.SimpleInterior Interior;

if(opaqueType==OpaqueType.ALL)

Interior= new MapInfo.Styles.SimpleInterior(); //缺省构造函数是白色实心

else

Interior= new MapInfo.Styles.SimpleInterior(1); //0是线透明，1是面透明

MapInfo.Styles.LineWidth lineWidth = new

MapInfo.Styles.LineWidth(1,MapInfo.Styles.LineWidthUnit.Point);

MapInfo.Styles.SimpleLineStyle LineStyle;

if(opaqueType==OpaqueType.ALL)

LineStyle = new MapInfo.Styles.SimpleLineStyle(lineWidth);

else if(opaqueType==OpaqueType.BORDER)

LineStyle = new MapInfo.Styles.SimpleLineStyle(lineWidth,2,borderColor); //2表示填充

透明，即能够显示轮廓

else

LineStyle = new MapInfo.Styles.SimpleLineStyle(lineWidth,0); //0表示全部透明，即连轮

廓都看不到

MapInfo.Styles.AreaStyle areaStyle = new

MapInfo.Styles.AreaStyle(LineStyle,Interior);

MapInfo.Styles.CompositeStyle compositeStyle = new

MapInfo.Styles.CompositeStyle(areaStyle,null,null,null);

return compositeStyle;

}

7 选择全部图元

MapInfo.Engine.Session.Current.Catalog.Search(

table,

MapInfo.Data.SearchInfoFactory.SearchAll(),

MapInfo.Engine.Session.Current.Selections.DefaultSelection,

MapInfo.Data.ResultSetCombineMode.Replace);

8 设置坐标系

缺省情况下，MapXtreme使用的CoordSys是经纬度投影（LongLat）和WGS84基准面。我想修改投影类型为

CoordSysType.TransverseMercator ，基准面为DatumID.Pulkovo1942

MapInfo.Geometry.CoordSysFactory

coordSysFactory=MapInfo.Engine.Session.Current.CoordSysFactory;

mapControl1.Map.SetDisplayCoordSys(coordSysFactory.CreateCoordSys("mapinfo:coordsys

8,1001,7,117,0,1,20500000,0"));

coordSysFactory.CreateCoordSys("mapinfo:coordsys 8,1001,7,117,0,1,20500000,0") 默认的原点

是（B=0,L=117）,如果要把原点设在(23,117)应该怎么写这个字符串呢？

coordSysFactory.CreateCoordSys("mapinfo:coordsys 8,1001,7,114,23,1,20500000,25000000")

9 保存新画的层为tab文件

下面的源码是新建一个永久表，然后在表中添加feature，然后保存为硬盘上的tab文件。mapxtreme

private MapInfo.Data.Table CreateNewMapDataTable(string tableName)

{

//以下代码是建立永久表

MapInfo.Data.TableInfoNative

tableInfoNative=newMapInfo.Data.TableInfoNative(tableName);

tableInfoNative.TablePath=@"D:/DATA/"+tableName+".TAB";

tableInfoNative.Columns.Add(MapInfo.Data.ColumnFactory.CreateIntColumn("ID"));

tableInfoNative.Columns.Add(MapInfo.Data.ColumnFactory.CreateStyleColumn());

MapInfo.Geometry.CoordSys coordSys =mapControl1.Map.GetDisplayCoordSys();

tableInfoNative.Columns.Add(MapInfo.Data.ColumnFactory.CreateFeatureGeometryColumn(coordSys)

);

MapInfo.Data.Table table

=MapInfo.Engine.Session.Current.Catalog.CreateTable(tableInfoNative);

//以下代码是建立临时表

// MapInfo.Data.TableInfo tableInfo

=MapInfo.Data.TableInfoFactory.CreateTemp(tableName);

// tableInfo.Columns.Add(MapInfo.Data.ColumnFactory.CreateIntColumn("ID"));

// MapInfo.Data.Table table

=MapInfo.Engine.Session.Current.Catalog.CreateTable(tableInfo);

MapInfo.Mapping.FeatureLayer featureLayer =

newMapInfo.Mapping.FeatureLayer(table);

this.mapControl1.Map.Layers.Add(featureLayer);

return table;

}

private void AddFeaturesAndSave()

{

MapInfo.Styles.SimpleLineStyle LineStyle =

newMapInfo.Styles.SimpleLineStyle(new

MapInfo.Styles.LineWidth(1,MapInfo.Styles.LineWidthUnit.Point));

MapInfo.Styles.CompositeStyle compositeStyle =

newMapInfo.Styles.CompositeStyle(null,LineStyle, null, null);

MapInfo.Geometry.CoordSys coordSys =mapControl1.Map.GetDisplayCoordSys();

MapInfo.Data.Table table = CreateNewMapDataTable("NewTable");

MapInfo.Data.TableInfo tableInfo = table.TableInfo;

while(……)

{

MapInfo.Data.Feature feature = newMapInfo.Data.Feature(tableInfo.Columns);

feature.Geometry = ……

feature.Style = ……

feature["ID"] = ……

table.InsertFeature(feature);

}

tableInfo.WriteTabFile(); //保存为.tab文件

mapControl1.Refresh();

}

10 计算缩放比例

/**//// <summary>

/// 重画控件时计算缩放比例

/// </summary>

/// <param></param>

/// <param></param>

protected void mapControl1_Paint(object sender,PaintEventArgs e)

{

MapInfo.Geometry.Distance zoomDistance=this.mapControl1.Map.Zoom;

double zoom=Convert.ToDouble(Convert.ToInt32(zoomDistance.Value*16.09))/10;

this.statusBar1.Text="缩放比例："+zoom.ToString()+" 千米";

}

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