Search TipsItem Classes
All graphical entities used to make maps and drawings (e.g. LineString, Polygon) are known as item classes. They are all sub-classes of an Item.
All item classes have properties that can be examined and edited using Properties or the Maps Control Bar.
Sub-classes of an Item inherit its properties and also include their own special properties.
For clarity and simplicity these item classes are grouped together with similar item classes into categories. These categories are reflected in the list below and on the Item menu of the main SIS Desktop 9.1 window.
This menu reflects the fact that some item classes have methods (i.e. commands) that can be applied to a specific item class. These methods are also available o
n the local, right mouse button menu.
The following table summarises the Cadcorp terminology for item classes.
Item class = _class$
Class name = _classLocal$ (may vary in countries using a localised language)
| Category | Description | _class$ | _classLocal$ |
|---|---|---|---|
| Point | Point | Point | Point |
| Multipoint | Multipoint | Multipoint | |
| Node | Node | Node | |
| TopoPoint | TopoPoint | TopoPoint | |
| LineString | LineString | Line | LineString |
| MultiLineString | MultiLine | MultiLineString | |
| TopoLineString | SeedChain | TopoLineString | |
| Link | Link | Link | |
| Polygon | Polygon | Area | Polygon |
| MultiPolygon | MultiArea | MultiPolygon | |
| TopoPolygon | SeedArea | TopoPolygon | |
| 3D | Grid | Grid | Grid |
| Surface | Surface | Surface | |
| Tin | TinSurface | Tin | |
| Solid | SolidSurface | Solid | |
| Image | Bitmap | Bitmap | Bitmap |
| Image | Image | Image | |
| MetaFile | MetaFile | MetaFile | |
| QZone | QZone | QZone | |
| Text | BoxText | BoxText | BoxText |
| Label | BoxLabel | ||
| LineText | LineText | LineText | |
| Text | Text | Text | |
| Collection | [user defined] | Insert | Insert |
| Assembly | Assembly | Assembly | |
| [user defined] | Group | Group | |
| Geometry/Collection | MultiGeometry | Geometry/Collection | |
| Paper | Dimension | DimDistance | Dimension |
| Dimension | DimChain | Dimension | |
| Dimension | DimRun | Dimension | |
| Dimension | DimDatum | Dimension | |
| Graticule | Graticule | Graticule | |
| Key Map | KeyMap | KeyMap | |
| North Point | NorthPoint | NorthPoint | |
| Map Frame | MapFrame | MapFrame | |
| Scale Bar | ScaleBar | ScaleBar | |
| Rubber sheeting | Displace | ||
| RubberSheet | |||
| Miscellaneous | none |
Note: The above table is of most relevance to developers but desktop users may also need this information if they use expressions or filters, (eg class tree filter).