You can select objects by enclosing them in a selection window. A selection window is a rectangular area that you define in the drawing area by specifying two corner points at the Select Objects prompt. The order in which you specify the points makes a difference. Dragging from left to right (window selection) selects only objects entirely within the selection area. Dragging from right to left (crossing selection) selects objects within and objects crossing the selection area. Objects must be at least partially visible to be selected.

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As your drawings become more complex, you can rename named objects to keep the names meaningful or to avoid conflicts with names in drawings you insert into the main drawing. You can rename any named object except those that AutoCAD names by default, for example, layer 0.

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You can define a hatch boundary by specifying points directly. For example, you may want to illustrate a pattern fill in a small section of a drawing, as shown in the following illustration. Continue reading →

Regions are 2D enclosed areas you create from closed shapes called loops. A loop is a curve or a sequence of connected curves that defines an area on a plane with a boundary that does not intersect itself. Loops can be combinations of lines, polylines, circles, arcs, ellipses, elliptical arcs, splines, 3D faces, traces, and solids. The objects that make up the loops must either be closed or form closed areas by sharing endpoints with other objects. The objects must also be coplanar (on the same plane).

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You erase freehand lines by using the Erase option of the SKETCH command. In Erase mode, wherever the cursor intersects the freehand line, everything from the intersection to the end of the line is erased.
Once you record freehand lines, you can’t edit them or erase them with the Erase option of SKETCH. Use the ERASE command after you finish sketching.

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