Layer 图层

Layers organize objects by categories (Wall, Column, Furniture, Electrical...) and enforce properties (Color, Linrtype, Lineweight).

Layer Properties

Home tab > Properties panel > Color/ Lineweight/ Linetype

By default, layer properties are set to ByLayer.
Objects in drawing do not have a specific color, linetype and lineweight.
Object's properties inherit Layer's properties

Layer States

Control objects appearance and selection

Set Current Layer

By Layer List

Select an individual layer from the layer list to make it current

Only one layer can make it current
You cannot make multiple layers or layer group current
New objects create are drawn on the current layer

Make Current

Sets the current layer to that of a selected object

Home tab > Layer Panel > Make Current

Select object

The object's layer become current