Autodesk AUTOCAD 2010 - PREVIEW GUIDE User's Guide Page 291

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Lesson: Changing Object Properties 277
ByLayer Property
The Properties panel in the Home tab of the ribbon displays the current property settings for objects
that you create in a drawing. The default settings are ByLayer which means that the object properties
are determined by the layer. By default, all objects use the ByLayer setting for color, linetype, and
lineweight.
The following image shows the default ByLayer settings on the object Properties panel.
Definition of the ByLayer Property Setting
The ByLayer property setting is assigned to objects and specifies its color, linetype, lineweight, and plot
style. This special property setting is the equivalent to using a specific color such as red or a specific
linetype such as Hidden. When property types are set to ByLayer, the object assumes the property
setting that is defined in the object's layer. If you change the property in the layer, all objects with the
ByLayer setting update accordingly.
The ByLayer setting not only enables consistency across objects on the same layer, it also ensures that
all objects update accordingly if you change the layer's color, linetype, or lineweight properties.
You should only override an object's color, linetype, or lineweight property to something
other than ByLayer when absolutely necessary. When you look at a drawing that contains
objects of the same colors and linetypes, the natural inclination is to assume those
objects are on the same layers.
Example of Changing Object Properties from the ByLayer Default
It is common drafting practice to place certain object types on their own layers. For example, all
centerlines would be on the same layer, all object lines on their own layer, and so forth. By following
this structure, you can readily control the display of all your objects both on screen and in print.
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