Posted on 2007-10-24 10:37
怎么羨慕天空的飛鳥 閱讀(1251)
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WebGis
近來一直修改一個由Map Objects2.1和vs2005 開發的一個桌面gis，設計到了doc文檔格式控制和動態生成點或面屬性的shape格式的文件。
生成shape文件的思路是先通過AddGeoDataset方法生成文件，然后添加屬性數據，下面會在代碼中詳細解釋個參數的含義。
//創建Isoseis
private void createIsoseis(MapObjects2.DataConnection dcIso,SeismEClass.SeismEClass tmpse)
{
try
{
//blw:::attribute parameters
string iso_id = TM.ToString("yyyyMMddHHmmss");
string iso_name = "Isoseis" + iso_id;
double iso_longitude = Math.Round(PCenter.X,2);
double iso_latitude = Math.Round(PCenter.Y,2);
float iso_magnitude = magnitude;
string iso_location = poly_pos;
string iso_date = TM.Year + "-" + TM.Month + "-" + TM.Day;
string iso_depth = angle;
int j = 0;
for (int i = 6; i < elli.Length;i++ )
{
if(elli[i]!=null)
{
j++;
}
}
//blw:::add shp files
MapObjects2.MapLayer temp_iso = getLayer(BasePath + "\\DataLayer\\SDE_Isoseis20070618165431.shp");
MapObjects2.Recordset temp_isorec = temp_iso.Records;
MapObjects2.TableDesc temp_isodesc = temp_isorec.TableDesc;
MapObjects2.GeoDataset temp_isogeo = dcIso.AddGeoDataset(iso_name ,temp_iso.shapeType ,temp_isodesc , false ,false);
MapObjects2.MapLayer temp_iso1 = new MapObjects2.MapLayer();
temp_iso1.GeoDataset = temp_isogeo;
MapObjects2.Recordset temp_isorec2=temp_iso1.Records;
//blw:::add attributes
for (int k = 0; k < j;k++ )
{
temp_isorec2.AddNew();
temp_isorec2.Fields.Item("ID").Value = iso_id;
temp_isorec2.Fields.Item("LATITUDE").Value = iso_latitude;
temp_isorec2.Fields.Item("LONGITUDE").Value = iso_longitude;
temp_isorec2.Fields.Item("MAGNITUDE").Value = iso_magnitude;
temp_isorec2.Fields.Item("LOCATION").Value = iso_location;
temp_isorec2.Fields.Item("DATE_").Value = iso_date;
temp_isorec2.Fields.Item("DEPTH").Value = iso_depth;
temp_isorec2.Fields.Item("Shape").Value = elli[k+6];
if (k == 0)
{ temp_isorec2.Fields.Item("AREA_").Value = tmpse.AreaSQVI;
temp_isorec2.Fields.Item("IDX").Value = "VI";
}
else if (k == 1)
{ temp_isorec2.Fields.Item("AREA_").Value = tmpse.AreaSQVII;
temp_isorec2.Fields.Item("IDX").Value="VII";
}
else if (k == 2)
{ temp_isorec2.Fields.Item("AREA_").Value = tmpse.AreaSQVIII;
temp_isorec2.Fields.Item("IDX").Value="VIII";
}
else if (k == 3)
{ temp_isorec2.Fields.Item("AREA_").Value = tmpse.AreaSQIX;
temp_isorec2.Fields.Item("IDX").Value = "IX";
}
temp_isorec2.Update();
}
}
catch(Exception ex)
{
MessageBox.Show(ex.Message);
}
}
下面是從網絡上搜集的一端比較精簡的代碼，很有代表性。
private void createshapefile()
{
int i;
MapObjects2.DataConnection mapdc=new MapObjects2.DataConnection();
mapdc.Database = "D:\\test";
mapdc.Connect();
MapObjects2.TableDesc mapdes = new MapObjects2.TableDesc();
mapdes.FieldCount = 2;
mapdes.set_FieldName(0,"Name");
mapdes.set_FieldType(0, MapObjects2.FieldTypeConstants.moString);
mapdes.set_FieldName(1,"Length");
mapdes.set_FieldType(1, MapObjects2.FieldTypeConstants.moDouble);
MapObjects2.GeoDataset mapgeo;
object zm=false;
mapgeo = mapdc.AddGeoDataset("hi", MapObjects2.ShapeTypeConstants.moShapeTypePolygon, mapdes,zm,zm);
MapObjects2.MapLayer maplayer=new MapObjects2.MapLayer();
maplayer.GeoDataset = mapgeo;
MapObjects2.Recordset maprs=maplayer.Records;
for (i = 0; i < 10; i++)
{
MapObjects2.Polygon mappolygon = new MapObjects2.Polygon();
MapObjects2.Points mappoints = new MapObjects2.Points();
MapObjects2.Point mappoint = new MapObjects2.Point();
mappoint.X = i*100;
mappoint.Y = 0;
mappoints.Add(mappoint);
mappoint.X = (i+1)*100;
mappoint.Y = 0;
mappoints.Add(mappoint);
mappoint.X = (i+1)*100;
mappoint.Y = 100;
mappoints.Add(mappoint);
mappolygon.Parts.Add(mappoints);
maprs.AddNew();
maprs.Fields.Item("Shape").Value = mappolygon;
maprs.Fields.Item("Name").Value = "hi";
maprs.Fields.Item("Length").Value = 341.4;
maprs.Update();
mappolygon = null;
mappoints = null;
mappoint = null;
}
}
核心： 勇敢進取年輕的心