Layer

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A Layer is a logical grouping of data, assembled as though they were laid out on transparent acetate overlays. The user may choose to put certain types of entities on certain layers.  Layers can be turned off and on, so that their respective data can be viewed in or out of context with adjacent layers. All new graphic objects are added to the current layer. When you create a new drawing it will already have one layer named "0".

These are the functions used to manage layers in a drawing:

Function	Meaning
lcDrwAddLayer	Adds a new layer into a drawing
lcDrwDeleteObject	Deletes an object from a drawing
lcDrwCountObjects	Counts a number of objects, by type
lcDrwSortObjects	Sorts objects by LC_PROP_TABLE_PRIORITY
lcDrwGetFirstObject lcDrwGetNextObject	Used to sequentially retrieve all objects
lcDrwGetObjectByName	Retrieves an object by its name
lcDrwGetObjectByID lcDrwGetObjectByIDH	Retrieves object by its identifier

Layer functions:

Function	Meaning
lcLayerClear	Deletes all entities on the layer

Layer object has the following properties :

Property	Type	Access	Meaning
LC_PROP_TABLE_...    Base class properties
LC_PROP_LAYER_ID	int string	R	Unique Identifier Hexadecimal string (up to 16 characters)
LC_PROP_LAYER_NAME	string	RW	Layer Name
LC_PROP_LAYER_DESCR	string	RW	Layer description
LC_PROP_LAYER_DRW	handle	R	Handle to owner drawing
LC_PROP_LAYER_COLOR	string	RW	Color of graphic objects
LC_PROP_LAYER_COLORI	int bool	RW R	Color Index (1..255) TRUE if the color is index
LC_PROP_LAYER_COLORT	int bool	RW R	True Color (COLORREF) TRUE if the color is RGB
LC_PROP_LAYER_FCOLOR	string	RW	Filling Color of graphic objects
LC_PROP_LAYER_FCOLORI	int bool	RW R	Color Index (1..255) TRUE if the filling color is index
LC_PROP_LAYER_FCOLORT	int bool	RW R	True Color (COLORREF) TRUE if the filling color is RGB
LC_PROP_LAYER_LINETYPE	handle string	RW	Handle to Linetype Name of Linetype
LC_PROP_LAYER_LWIDTH	int	RW	Linewidth
LC_PROP_LAYER_LOCKED	bool	RW	"Locked" flag
LC_PROP_LAYER_NOPRINT	bool	RW	"Not printable" flag
LC_PROP_LAYER_VISIBLE	bool	RW	"Visible" flag
LC_PROP_LAYER_0	bool	R	"Layer 0" flag
LC_PROP_LAYER_NODLG	bool	RW	Not displayed in the "Layers" dialog
LC_PROP_LAYER_JUMPLINES	bool	RW	Enable jump lines for entities of this layer
LC_PROP_LAYER_OSNAP	bool	RW	Enable object snap for entities of this layer
LC_PROP_LAYER_NOEXPORT	bool	RW	If true then the layer and related entities will not be exported

See also

  Named objects