Using Layer Properties

You can assign properties to layers as well as to individual objects in a drawing. When you draw on a layer, the default setting for new objects is BYLAYER for color, linetype, lineweight, and plot style. Objects with a BYLAYER setting for any property assume the property of the layer upon which they are drawn. For example, if you draw on a layer assigned the color green, the linetype CONTINUOUS, the lineweight 0.25 mm, and the plot style Normal, the object drawn has all these properties. Using the default object property setting of BYLAYER for color, linetype, lineweight, and plot style helps to maintain an organized drawing. If you organize your layers in conceptual groupings (such as bolts, washers, or part numbers), you can easily recognize an object by the properties of its layer.

If you want a specific object to have a different color, linetype, lineweight, or plot style than the layer it is drawn on, you can change the object property setting. An object property can be set to a specific property value (such as red for color) or to a setting of BYLAYER or BYBLOCK. The object-specific property setting overrides the layer property settings unless the value is set to BYLAYER.

If you choose BYBLOCK as an object property setting, new objects are drawn with the default property setting until they are grouped into a block. When objects are grouped into a block, the objects in the block inherit the property settings of the layer the block is inserted on.

For example, a block named CHAIR is made up of two objects, the seat and the back of the chair. The seat object is drawn on a layer named SEAT and the back object is drawn on a layer named BACK. The block CHAIR is inserted on a layer named CHAIR that is assigned the color magenta. If the layers SEAT and BACK are assigned a color setting of BYLAYER, each object is displayed with the color assigned to its layer, regardless of the layer the block is inserted on. If the layers SEAT and BACK are assigned a color setting of BYBLOCK, each object is displayed with the color assigned to the layer that the block is inserted on (all objects in the block CHAIR are displayed as magenta).

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