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04 - Layers

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04 - Layers Powered By Docstoc
					                                                         Prepared by   : Chandra Kanth. K
                                                         Contact       : chandrakanth.k@live.com

                                  AUTO CAD TRAINING

                                           4. Layers

ABOUT LAYERS:

In the Layer Properties Manager, you will notice that each layer can have a number of
specific properties.

Go to “Format”  “Layers”.




             Status           : Displays the current state of the layer. In this example, the
              green check means that Objects is the current layer.
             Name             : The name of the layer. Give layers understandable names.
             On                       : If a layer is 'On' it means that it is visible (but objects
              can still be erased when the 'Select > All option is used).
             Freeze           : A layer is not visible and cannot be deleted.
             Lock             : Layer is visible, but cannot be modified.
             Color            : A specific color for everything on that layer.
             Line type                : A specific line type (hidden, center, etc) for the layer.
             Line weight : The visible width of the objects on that layer.
             Plot             : A defined color for the plotter to use on that layerPlot two
              columns use the same name: Switch on or off if that layer is plotted.
             Description : A user-defined description for the layer.

       Hint: Click “Alt+N” to create a new layer.




          To copy Objects to Different layers use “COPYTOLAYER” Command.
          To Change the Layer of Selected Objects to the Layer of selected Destination
           Object use “LAYMCH” Command.
          After selecting one or more objects, all layers except the layers of the selected
           objects are turned off, frozen in the current layout viewport, or locked, depending
           on the current setting. The layers that remain visible and unlocked are termed
           isolated “LAYERISO”& “LAYERUNISO”.




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                                                                           Auto CAD Training
                                                                                   4. Layers


          You can use Layer Previous to undo changes you make to layer settings. For
           example, if you freeze several layers and change some of the geometry in a
           drawing, and then want to thaw the frozen layers, you can do this with a single
           command without affecting the geometry changes. In another example, if you
           changed the color and line type of several layers but later decide you prefer the
           old properties, you can use Layer Previous to undo the changes and restore the
           original layer settings.
          Layer Previous does not undo the following changes:
          Renamed layers. If you rename a layer and change its properties, Layer Previous
           restores the original properties but not the original layer name.
          Deleted layers. If you delete or purge a layer, using Layer Previous does not
           restore it.
          Added layers. If you add a new layer to a drawing, using Layer Previous does not
           remove it.
          “LAYERP”.
          LAYEREVAL: Controls when the Unreconciled New Layer filter list in the Layer
           Properties Manager is evaluated for new layers.

The setting is stored in an integer using one of the following values:

“0” - Off
“1” - Detects when new Xref layers have been added in the drawing.
“2” - Detects when new layers have been added in the drawing and xrefs.




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                                                                        Auto CAD Training
                                                                                4. Layers


HOW TO SAVE LAYER STATES MANAGER:

    1. Click “Format” menu  “Layer States Manger”.
    2. In the Layer States Manager, click New.
    3. In the “New Layer State to save” dialog box, enter a name for the new layer state,
        or select a name from the list.
    4. (Optional) Add a description.
    5. Click “OK”.
    6. Click on “Edit”
    7. “Edit Layer State” dialog box will appear modify the layer properties and click
        “OK”.
        (Turn on the wanted layers, which you want to display in the named plans and
        turn off the unwanted layers, which you do not want to show up in the named
        plan)
    8. Then Click “Save”
    9. (Optional) Select the Turn off New Layers Not Found in Layer State option.
        When this option is selected and you restore a named layer state, the drawing
        looks the same way it did when the named layer state was saved.
    10. Click Close to exit the Layer States Manager.




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Description: AutoCAD Training Manual