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SwiftGIS MapDraw .NET v1.0 Specification
by Administrator
8. 三月 2011 07:23
What’s the SwiftGIS MapDraw .NET 1.0?SwiftGIS MapDraw .NET 1.0 is a comprehensive and extensible Geographic InformationSystem  (GIS) library  which contains  hundreds of different APIs  for the  customdevelopment  of  stand-alone  and  GIS  featured  systems  and  application  usingobject-oriented languages based on Microsoft .Net Framework 2.0 or higher. It’s createdwith various  geometries  which represent  any  shaped  object  on  the  earth,  like  point,square,  circle,  and  polygon  etc. It  also  provides  thousands  pre-defined  coordinatesystems  including  EPSG,  ESRI,  NAD, and World  for  actuality,  on-the-fly  feature  datare-projection, supports most vector, raster, grid, 3rd web GIS service, and most databasespatial engines, such as MS Spatial SQL Server, Oracle Spatial, PostGIS etc. Most dataformats  are  supported  in  a  native  manor. We  promise  that  all  are  implemented  withmanaged code except few extensions.
1. Geometry Module: Geometry shape is an important object and is widely applicable indrawing, creating, editing or modifying property data. It’s always display as WKT or WKBformat. The geometry  is not simply composed by point, line string and polygon, more  itcontains  other geometric  shapes  including  segment,  linear  ring,  ellipse,  envelop,multi-points, multi-linestring, multi-polygon and GeoCollection. Furthermore, the MapDrawprovides  a variety  of methods  to  determine  the  relationships  between  them,  such  ascontains, crosses, intersects, overlaps or so. 2.  Symbol Module: The Symbol  is  an  abstract  class  of MapDraw  that determines  thestyles  of  point,  line  string,  polygon  and  the  text. When  we  want  to  express  the  richinformation in a GIS application, we need  to use different symbols and colors  to conveythe  different  meaning.  Currently,  it  contains  HSimpleFillSymbol,  HSimplePointSymbol,HGradientFillSymbol, HImageFillSymbol, HImageLabelSymbol, HImagePointSymbol.3. Feature Class Module: Feature  data  layer  are  homogeneous  collections of  commonfeatures, each having the same spatial representation, such as points, lines, or polygons,and a common set of attribute columns, for example, a line feature class for representingroad centerlines with additional information. It also includes the render styles.4.  Raster  Class  Module: Raster  datasets  are  commonly  used  for  representing  andmanaging  imagery, digital elevation models, and numerous other phenomena. It allowsusers  to  retrieve  desired  data  from  raster matrices  according to  the  characteristics  ofraster layer.5. TileResource Module: The abstract  class which  is  the base of all  the objects whichrequest  the  images  from web GIS  services,  such  as WMS,  TMS, Bing Maps, Googlemaps and so on.6. Layout Module: The Layout class allows users to add elements