Class CMDatasetVector extends CMDataset

CMDatasetVector
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.

Object Functions

Inherited From: CMDataset

Object Functions

SetBounds(NewBounds)

Check if the feature is visible in the view.
This should be called by subclasses but can also be called to limit a layer's bounds after loading.

Parameters:
    NewBounds - Bounds with format {XMin,XMax,YMin,YMax}

Bounds=GetBounds()

Returns the bounds of the data within the layer. Computed after loading the data.

Returns: Bounds - with format {XMin,XMax,YMin,YMax}

Bounds=GetFeatureBounds()

Returns the bounds of the specified feature.

Returns: Bounds - with format {XMin,XMax,YMin,YMax}

[FeatureIndex,AreaIndex,PolyIndex,PointIndex]=GetInChain()

Gets a chain (array of indexes) to the region, area, poly, or point that was selected

Returns: [FeatureIndex,AreaIndex,PolyIndex,PointIndex] - null

Paint()

Paints the specified data into the view.

AddPoint()

Add a new point to the data

AddPoly()

Add a new polyline to the data

SetPosition()

Add a new point to the data