Class CMDataset extends CMBase
CMDataset Class
This is effecitvely an abstract class that provides an API between
the layer class and the data that may be shared between muliptle layers.
The data typically contains individual spatial features with attributes
But can also contain raster data organized as tiles.
Datasets are stored in a global CMDataset.TheDataSets[] array object
Selections within a dataset are managed by a chain which is an
array of N indexes. The array can be null for no selection and
update to 4 indexes deep. The indexes are for:
- SelectedFeatureIndex
- SelectedAreaIndex
- SelectedPolyIndex
- SelectedCoordinateIndex
Copyright (C) 2020, Humboldt State University, Jim Graham
This program is free software: you can redistribute it and/or modify it under the terms of the GNU General
Public License as published by the Free Software Foundation, either version 3 of the License, or (at your
option) any later version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the
implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License along with this program. If not, see
Enumerated Types
CMDataset.GEOJSON=1CMDataset.PYRAMID=2
CMDataset.PYRAMID_OPEN_FORMAT=3
CMDataset.RASTER=4
CMDataset.SQL=5
CMDataset.LOAD_STATUS_NONE=1 - request has just been created and is not in the que yet
CMDataset.LOAD_STATUS_PENDING=4 - element is waiting in the que
CMDataset.LOAD_STATUS_LOADING=2 - request to load was sent and waiting for element to load
CMDataset.LOAD_STATUS_LOADED=3 - element is loaded
CMDataset.LOAD_STATUS_CANCELED=5 - request was canceled, probably from the user changing the zoom level (moves request out of request que)
Object Functions
Inherited From: CMBase
| Returns | Function | Throws |
|---|---|---|
| Number | GetNumAttributeRows() | |
| Number | GetNumAttributeColumns() | |
| Specified | GetAttributeHeading() | |
| Array | GetAttributeHeadings() | |
| Array | GetAttributeIndexFromHeading() | |
| Specified | GetAttributeCell(ColumnIndex, RowIndex) | |
| Specified | GetAttributeCellByHeading(Heading, RowIndex) | |
| AddAttributeHeading(NewHeading, DefaultValue) | ||
| SetAttributeCell(ColumnIndex, RowIndex, Value) | ||
| GetAttributeArray(Heading) | ||
| SetProjector(NewProjector) | ||
| Current | GetProjector() |