A layer is a logical grouping of data, assembled as though they were laid out on transparent acetate overlay sheets over a base plan. Users commonly choose to put certain related information on named  layers - irrigation, planting, notes, dimensions etc. Individual layers or groups of layers can then be turned off and on so that their respective data can be viewed in or out of context with information on adjacent layers. 

Layers can be used to control entity visibility. Once an entity has been placed on its own layer, the color, linetype, line thickness can be controlled by the layer settings. If needs be, the layer can be locked so that there can be no inadvertent movement of entities on it.

Activating the Layers Properties Manager

The Layer Properties Manager can be activated in a number of ways:

Choose Layers from the Format drop down menu
Select the layer icon from the first toolbar 
Type LAYER or LA in the command line and then press Enter

The figure below shows the Layer Properties Manager in gCADPlus.

Layer properties

 Movie Here is a small movie in which we discuss (in general terms) the operation of the Layer Properties Manager dialog box.  

Tip: All new graphic objects placed in the drawing editor are added to the current layer. 
Tip: When a new drawing is created, it will already have one layer named "0" [layer zero]. It is not possible to remove layer zero.
Removing layers

We suggest that the layer list associated with a drawing should be kept relatively short in order to be manageable. In order to keep a list manageable, remove unwanted layer.s

  Movie on layers Here is a short movie in which some of the features of the Layer Properties Manager dialog box are discussed. We delete any layers that do not contain entities.

  Layer properties  The Layer Properties manager is a powerful tool in gCADPlus. Many layer properties can be controlled such as visibility, printing or non printing, line thickness of entities on a layer, linetypes associated with a layer and so on. It pays to take notice of some visual clues when removing layers.

Mini Layer Tool

Some users prefer to see the layers status at all times while working. To that end, we have provided a mini version of the layer manager that can be 'parked' under the Properties box at at the bottom left of the drawing editor. The mini layer tool display can be controlled by an option on the view drop down menu.

Mini layer tool

Use layers extensively when you are tracing over the top of a scanned image. The example below shows a gCAD+ drawing where a new CAD logo is being made from a JPEG image file.

many layers