You can hatch an enclosed area or hatch within a specified boundary using . By default, HATCH creates associative hatches that are updated when the boundary is changed.
You create a hatch by selecting an object to hatch or by defining a boundary and then specifying an internal point. A hatch boundary can be any combination of objects, such as lines, arcs, circles, and polylines, that forms an enclosed area.
Enclosed areas within the hatch area are referred to as islands. You can hatch them or leave them unhatched depending on the Islands setting in the Hatch and Gradient dialog box.
If you are hatching a small area in a complex drawing, you can use boundary sets to speed the process.
Objects can be hatched only if they are in a plane parallel to the XY plane of the current UCS.
When a hatch boundary cannot be determined, it might be because the specified internal point is not within a fully enclosed area. Red circles are displayed around unconnected endpoints of the boundary to identify gaps in the hatch boundary.