MapXtreme 2005 學習心得一些基礎函數代碼(四)

網上看到的基本上代碼都大同小異,經過本人小小修改或未修改的代碼如下:

一：先建立圖層

1：建立圖層函數代碼：createlayer

/// <summary>

/// 建立臨時圖層

/// by 路過秋天

/// <param name="tablename">表名</param>

/// <param name="layername">圖層名</param>

/// </summary>

public static void createlayer(string tablename, string layername)

{

mapinfo.mapping.map mymap = mapinfo.engine.session.current.mapfactory[0];//取得目前地圖

//建立記憶體表資訊(tableinfo中的一種,是以當然還有其它很多種表類型)

mapinfo.data.tableinfomemtable tblinfo = new mapinfo.data.tableinfomemtable(tablename);

//向表資訊中添加可繪圖列(必備的列)

tblinfo.columns.add(mapinfo.data.columnfactory.createfeaturegeometrycolumn(mymap.getdisplaycoordsys()));

tblinfo.columns.add(mapinfo.data.columnfactory.createstylecolumn());

//向表資訊中添加其它資料列(可選的列)

tblinfo.columns.add(mapinfo.data.columnfactory.createintcolumn("index"));//建立整形的列，當然還有其它日期型的,doule型的等等

tblinfo.columns.add(mapinfo.data.columnfactory.createstringcolumn("value", 20));//建立字元串型的列,并指定長度

//確定目前目錄下不存在同名表

mapinfo.data.table table = mapinfo.engine.session.current.catalog.gettable(tablename);

if (table != null)

{

mapinfo.engine.session.current.catalog.closetable(tablename);

}

//根據表資訊建立臨時表

table = mapinfo.engine.session.current.catalog.createtable(tblinfo);

//建立圖層(并關聯表)

featurelayer templayer = new featurelayer(table, layername, layername);

mymap.layers.add(templayer);

}

二：在圖層的基礎上，建立點，線，或其它圖型

1：建立點函數代碼：addpoint

/// 添加點

/// <param name="layername">圖層名稱</param>

/// <param name="dpoint">點的坐标</param>

/// <param name="shortcode">點的代碼,不同的數字有不同的形狀(圓型，三角型，正方型等)</param>

/// <param name="color">點的顔色</param>

public static void addpoint(string layername, dpoint dpoint, short shortcode, color color)

mapinfo.mapping.map mymap = mapinfo.engine.session.current.mapfactory[0];

//擷取圖層和表

featurelayer worklayer = (mapinfo.mapping.featurelayer)mymap.layers[layername];

mapinfo.data.table table = worklayer.table;

//建立點

featuregeometry point = new mapinfo.geometry.point(worklayer.coordsys, dpoint);

//以下兩行是圖形的樣式

mapinfo.styles.simplevectorpointstyle spspoint = new mapinfo.styles.simplevectorpointstyle(shortcode, color, 20);

mapinfo.styles.compositestyle pointstyle = new mapinfo.styles.compositestyle(spspoint);

//接下來建立一行資料

mapinfo.data.feature pointrow = new mapinfo.data.feature(table.tableinfo.columns);

pointrow.geometry = point;//必備列[圖形]

pointrow.style = pointstyle;//必備列[圖形樣式]

pointrow["index"] = new random().next(999);

pointrow["value"] = "this is a point";

//将一行資料放入表中

table.insertfeature(pointrow);

說明：

關于shortcode:

參考c:\program files\mapinfo\mapxtreme\6.7.1\documentation\pdf\mapxtreme2005_devguide.pdf

下的appendix g:style lookups(附錄g，樣式查找)下的vector symbols(矢量符号)->map symbols （地圖符号）

2：建立線函數代碼：addline

/// <summary>

/// 添加線[代碼和建立點的相差無幾]

/// <param name="startpoint">線段起點坐标</param>

/// <param name="endpoint">線段終點坐标</param>

/// <param name="shortcode">線的shortcode(線的型狀也有多種，比如單箭頭，雙箭頭等)</param>

/// <param name="color">線的顔色</param>

public static void addline(string layername, dpoint startpoint, dpoint endpoint, int shortcode, color color)

//建立線

featuregeometry line = multicurve.createline(worklayer.coordsys, startpoint, endpoint);

mapinfo.styles.simplelinestyle slsline = new mapinfo.styles.simplelinestyle(new linewidth(3, linewidthunit.pixel), shortcode, color);

mapinfo.styles.compositestyle linestyle = new mapinfo.styles.compositestyle(slsline);

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";

//将線圖元加入圖層

table.insertfeature(ptline);

三：顯示标注文本

1：顯示标注文本函數代碼：showvalue

/// 顯示标注

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

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

public static void showvalue(string tablename, string columnname)

//建立标注圖層并綁定資料(整個過程有點像datagrid控件指定資料源控件sqldatasource，而資料源控件又綁定了datatable)

labellayer labellayer = new labellayer();

mymap.layers.add(labellayer);

//指定要标注的資料表

labelsource source = new labelsource(table);//綁定table

labellayer.sources.append(source);//加載指定資料

//指定哪個字段作為顯示标注(在非必備的自定義列裡挑一個，比如我們就挑"value"列)

source.defaultlabelproperties.caption = columnname;

//标注樣式等屬性,注意這段注釋的代碼，是指在一定的縮放比例範圍内才顯示文本,要是不注釋掉,可能折騰半天也看不到為啥顯示不出來文本

//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("黑體", 12);

font.forecolor = system.drawing.color.red;

source.defaultlabelproperties.style.font = font;

先上這四個最基本的函數，如果把這幾個函數放一個類中，别忘了加名稱空間

using mapinfo.geometry;

using mapinfo.mapping;

using mapinfo.styles;

using mapinfo.data;

using mapinfo.text;

using system.drawing;

http://www.cnblogs.com/cyq1162/archive/2009/11/02/1594505.html

MapXtreme 2005 學習心得 一些基礎函數代碼(四)

MapXtreme 2005 學習心得一些基礎函數代碼(四)