Layer 图层

Logically organize the objects in the drawing and to enforce linetype, color and lineweight standards




DIfferent objects on different layer


Show everything and has the flexibility to easily remove the overlays to focus only on certain aspects of your design


Typical Layers
A typical drawing could use layers to organize objects in the following way:



Hidden - Geometry that is represented by hidden lines
Dimension - Drawing dimensions
Annotation - Text and notes
Hatch - Hatch patterns, fills, gradients
Object - Geometry
Title Block - Borders, Title Block and title block information


Layer Properties Manager


Use the Layer Properties Manager to create and manage the layers in a drawing





New: Layer Properties Manager in palettes form
Layer changes occur instantly



Default Layer
Layer 0 is automatically crested for every new drawing

Layer 0 cannot be renamed or deleted

AutoCAD® uses that layer to establish predictable behaviors for objects such as blocks

Command Options

Create New layer

Delete layer

Cannot delete Current layer

Make layer Current

Layer Status

On - Visible

Off - Invisible and still considered

Thawed - Visible

Frozen - Invisible but not considered

Cannot Freeze Current layer

Unlock - Can select and edit objects

Lock - Cannot select and edit objects

Layer Properties

Color

Linetype 线型

By default only Continue linetype is loaded

Click "Load" to load the linetype required

Lineweight 线宽

Layer Control List

Reveal the list of Layers

Show object on which layer

Change the object to different layer

Video demo

Scale 缩放

Change the size of existing geometry

Scale factor: Decrease - less than 1

                   Increase > 1

Copy Option

Scale a copy of the selected geometry

Reference Option

Specify the new length after scale

Specify Reference length

Enter New length

It is often quicker and more accurate than calculating a scale factor

Array 阵列

Duplicate existing objects in a rectangle or circular (polar) pattern

Rectangular Array

1. Enter the number of rows and columns

2. Row offset: distance to offset each row

3. Column offset: distance to offset each column

4. Angle of array: angle for the pattern

5. Select objects: last step

Polar Array

1. Center point: pick the center point

2. Total number of items: includes the original object

3. Angle to fit: negative number array in clockwise

4. Select objects: last step

New feature

Zoom and Pan while preview

Mirror 镜像

Create symmetric versions of geometry

Define a mirror line to mirror object

Mirror Text

MirrText set to 0

Rotate 旋转

Rotate the objects simply by entering an angle for the rotation

Copy Option

Make a copy of the object while rotating

Reference Option

Defining a reference angle and then entering a new angle for the reference angle

  

Copy 复制

Quickly create duplicates of objects at a specified distance from the original

To create multiple copies, simply continue specifying second points

Move 移动

Reposition an object in the drawing

Base Point: On the object being move

Other Selection

Select Last

Select the most recently created visible object

After "Select objects" command prompt - L

Select Previous

Recall the most recent selection set

After "Select objects" command prompt - P

Shift + Select objects: Remove object from selection set

Fence Selection

Make a series of line segments across the objects you wish to select

After "Select objects" command prompt - F

Specify points that define a series of line segments

Crossing Polygon

Select objects enclosed or crossed by an irregularly shaped crossing polygon area

After "Select objects" command prompt - CP

Specify points that define an area

Object within and cross by window will be select

Window Polygon

Select objects within a non-rectangular window

After "Select objects" command prompt - WP

Specify points that define an area

Objects within window will be select

Grips 夹点

Grips appear when you select an object without activate command

Grip Edit

1. Unselect - Blue - snapping points

2. Hover - Green  

3. Selected - Red  

Provide information

 

Hot grip - can perform editing tasks

Crossing Selection 窗交方式

Drag the cursor from right to left without any command

Dashed outline and green shading window

All objects within or touched by crossing window are included in the selection set

Window Selection 窗口方式

As the drawing grows in complexity and contains more objects, you need to use different selection methods to select these objects efficiently

Selection Set

An object or group of selected objects

Create a selection set either before or after activating the pertinent 恰当的 command

Window Selection

Click and drag the cursor from left to right and click the opposite corner without command

Solid outline and purple shading window

Objects enclosed completely within the implied window will be selected

Units 单位

Set the Units for New drawing

AutoCAD is accurate 14 decimal places (1.00000000000000)

The units setting is only affect the current drawing only

Do not change units for existing drawing, the change only effect from this point onwards

Object Snap Tracking 对象捕捉追踪

Locate a point using the existing objects as reference

Hover to Acquire a point

Locate the center of a noncircular object such as a rectangle or polygon

Create geometry at a location relative to other objects

1. Acquire point from other object

2. Track back to the Intersection point where 2 lines meet

Settings

1. Alignment paths only appear for horizontal and vertical alignments

    Get familiars with orthogonally first before using other angles

2. Alignment paths appear for all polar angles defined

Video demo