b2科目四模拟试题多少题驾考考爆了怎么补救
b2科目四模拟试题多少题 驾考考爆了怎么补救

[原创]MapXtreme实用技巧与源码10例

电脑杂谈  发布时间:2017-01-21 21:03:05  来源:网络整理
mapxtrememapxtreme

1 设置图层可选状态

2 设置层的可用状态

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>

///<paramname="tableAlias">层别名</param>

publicvoidLayerCenter(stringlayerName)

{

MapInfo.Data.Table[]tables=newMapInfo.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.IMapLayerFilteriMapLayerFilter=MapInfo.Mapping.MapLayerFilterFactory.FilterByTable(tables);

MapInfo.Mapping.MapLayerEnumeratormapLayerEnumerator=mapControl1.Map.Layers.GetMapLayerEnumerator(iMapLayerFilter);

mapControl1.Map.SetView(mapLayerEnumerator);

OnFeatureUnclick();

}

4 放大缩小地图

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>

///<paramname="layerName">层名</param>

///<paramname="opaqueType">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>

///<paramname="borderColor">如果是边界不透明,此处设置边界颜色</param>

publicvoidLayerTransparent(stringlayerName,OpaqueTypeopaqueType,System.Drawing.ColorborderColor)

{

MapInfo.Styles.CompositeStylecompositeStyle=GetOpaqueStyle(opaqueType,borderColor);

//创建连接和命令来更新table中的数据

MapInfo.Data.MIConnectionconnection=newMapInfo.Data.MIConnection();

connection.Open();

MapInfo.Data.MICommandcommand=connection.CreateCommand();

command.CommandText="update"+layerName+"setobj=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>

///<paramname="opaqueType">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>

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

///<returns>组合style</returns>

privateMapInfo.Styles.CompositeStyleGetOpaqueStyle(OpaqueTypeopaqueType,System.Drawing.ColorborderColor)

{

MapInfo.Styles.SimpleInteriorInterior;

if(opaqueType==OpaqueType.ALL)

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

else

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

MapInfo.Styles.LineWidthlineWidth=newMapInfo.Styles.LineWidth(1,MapInfo.Styles.LineWidthUnit.Point);

MapInfo.Styles.SimpleLineStyleLineStyle;

if(opaqueType==OpaqueType.ALL)

LineStyle=newMapInfo.Styles.SimpleLineStyle(lineWidth);

elseif(opaqueType==OpaqueType.BORDER)

LineStyle=newMapInfo.Styles.SimpleLineStyle(lineWidth,2,borderColor);//2表示填充透明,即能够显示轮廓

else

LineStyle=newMapInfo.Styles.SimpleLineStyle(lineWidth,0);//0表示全部透明,即连轮廓都看不到

MapInfo.Styles.AreaStyleareaStyle=newMapInfo.Styles.AreaStyle(LineStyle,Interior);

MapInfo.Styles.CompositeStylecompositeStyle=newMapInfo.Styles.CompositeStyle(areaStyle,null,null,null);

returncompositeStyle;

}

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。

privateMapInfo.Data.TableCreateNewMapDataTable(stringtableName)

{

//以下代码是建立永久表

MapInfo.Data.TableInfoNativetableInfoNative=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.CoordSyscoordSys=mapControl1.Map.GetDisplayCoordSys();

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

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

//以下代码是建立临时表

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

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

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

MapInfo.Mapping.FeatureLayerfeatureLayer=newMapInfo.Mapping.FeatureLayer(table);

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

returntable;

}

privatevoidAddFeaturesAndSave()

{

MapInfo.Styles.SimpleLineStyleLineStyle=newMapInfo.Styles.SimpleLineStyle(newMapInfo.Styles.LineWidth(1,MapInfo.Styles.LineWidthUnit.Point));

MapInfo.Styles.CompositeStylecompositeStyle=newMapInfo.Styles.CompositeStyle(null,LineStyle,null,null);

MapInfo.Geometry.CoordSyscoordSys=mapControl1.Map.GetDisplayCoordSys();

MapInfo.Data.Tabletable=CreateNewMapDataTable("NewTable");

MapInfo.Data.TableInfotableInfo=table.TableInfo;

while(……)

{

MapInfo.Data.Featurefeature=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


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