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Distributing objects by layers

Distributing objects by layers

Distributing Objects by Layers

The main advantage of CAD is organizing a document by layers. Layers are used to separate, sort and edit drawing objects.

To explain the function of layers we will use an example with tracing paper. Layers in the drawing are like transparent tracing papers. One tracing paper (or layer) contains the floor plan, the second – water supply system, the third – heating, the fourth – electric power supply etc.   By combining different layers (tracing papers), you can create the required sets of design documentation.

Placing different groups of objects on separate layers helps to order and simplify many of the operations of drawing management. For better organization and operation of data, drawing elements of one type are placed on the same layer. For example, auxiliary lines are placed on a separate layer to facilitate and accelerate their removal. Dimensions, text objects, hatches etc. can be placed on separate layers.

Every newly created object contains by default the 0 layer, which cannot be deleted or renamed. The drawing must contain at least one layer because any graphic object must be placed on a layer (it is often said that an object belongs to a layer).

It is not recommended to create all drawing objects on the 0 layer. It is recommended to create a new layer for the correct organization of graphic objects.

When the first dimension is set, the Defpoints utility layer is created; this is where the control points of dimensions are set.  The display view of these points is not changed with the DDPTYPE command. The Defpoints layer is never printable.

When an object is created, its properties are taken from the layer where it is placed (if By layer is selected).

If you specify a particular color, type and line weight instead of the Bylayer parameter in the Color, Linetype and Line Weight drop down lists on the Properties panel, these values will be applied to all newly created objects on the layer.

To create a new object you do not need to specify its properties every time. You switch to the required layer and create the object.

Distributing objects by layers helps to edit objects’ properties separately. By blocking separate layers, you can prevent editing of objects placed on these layers if you do not want accidental changes. Layers can be switched on/off, visible/invisible. Every layer can be made printable or unprintable.

An active layer, selected for working with, is called current. By default, newly created objects are placed on the current layer.

Some frequently used parameters for managing layers and their properties are placed on the Properties toolbar:

 

And in the General section of the Properties bar:

The Layer drop down list allows reassigning of the current layer, and also switch on/off, freeze/unfreeze and block/unblock a layer:

Color, Line type and Line weight drop down lists are used to change the properties of a selected layer quickly:

The Layers  button on the Properties toolbar opens theLayers dialog box where you can create, delete, rename and do other operations with layers.

Layers

MouseOK    Ribbon: Home – Layers >  Layer Properties

MouseOK   Menu: Format –  Layers…

MouseOK   Toolbar: Properties

KeyboardOK Command line: LAYER, LAYERS, LO

The Layers dialog box is used to manage layers and their properties:

There is a window in the left part of the dialog box with a category tree.  In general, a category tree consists of the following elements:

·         All

·         All Used Layers

·         All Layers without xrefs;

·         External references

·         Filters

·         Groups

·         Configurations

The right part of the dialog box shows the list of layers for the selected element in the category tree.

Below the dialog box title:

 – the selected element in the category tree is shown,

 – the current layer is shown.

Parameters:

Tree categories window

Add group

The button adds groups of layers.

Add filter

The button adds a filter.

Add configuration

The button adds configurations of layers.

Delete

The button deletes the tree’s elements.

 

 

 

 

Remark:

Short description of the layer’s configuration. The parameter is displayed above the Invert filter when you select the layer’s configuration in the tree.

Invert filter

The Inversion mode for the display of layers in the layer’s list.

List of edited layers

Buttons

Add

The button adds a new layer.

Add Layer VP Frozen in All Viewports

Adding a layer frozen in all viewports.

Delete

The button deletes a selected laye.r

 

 

 

Edit property

The button edits selected filter.

 

 

 

Layer walk

The button turns the single layer mode on.

Refresh

Regeneration

Layer settings

Controlling the display parameters in the Layers dialogue box and properties of layers included in xrefs.

Collapse Layer Filter Tree

Expand Layer Filter Tree

Buttons to control the display of layers filter tree.

Columns

 Status

Column displays the current layer.

Current layer

Layer contains objects.

 

Layer contains objects.

Layer contains no objects.

 

Xref layers.

Layer contains objects and properties override is enabled in the viewport.

Name

Column displays the layer’s name.

Column displays the icon for visibility of layers.

Column displays the icon for freezing of layers.

Column displays the icon for locking a layer.

Color

Column displays an icon for the layer’s color.

Line Type

Column displays the layer’s line type.

Line weight

Column displays the layer’s line weight.

Transparency

Displays the layer transparency.

Plot style

Column displays the layer’s plot style.

Column displays the icon permitting printing.

Column displays frozen layers in the current viewport.

Description

Short information about the layer.

Double-click by the left mouse button on the column header separator automatically changes the columns width.

Layers in paper space

When working in paper space, a message appears in the title of the Layers dialogue box –

When there is a current layout VIEWPORT, the title will look like -

Columns with information about layers parameters in the viewport are added to the list of layers box.

Displays the icon of layer freeze in the current viewport.

Viewport Color

Displays the layer color in the current viewport.

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