If you wish to see examples of a more complex hatch patterns, simply open the ACAD.pat file and you will see the code for all of AutoCAD's hatch patterns. As stated before, some are very simple while others are incredibly complex. However, it is possible to create simple and effective hatch patterns which will help you in your everyday work. For example, if you use AutoCAD to create Architectural floor plans, you can create a hatch pattern to generate a ceiling grid so that each panel is 24x48 inches in size which eliminates having to use construction lines. Round elements such as arcs and circles cannot be specified in a hatch pattern, only straight lines and dots.
Most AutoCAD users have many text styles defined in their drawing.
You'll be surprised how much time you save by using one of these methods. It searches AutoCAD's library path, or specified directory paths, to find particular files. This function is great for routines that help automate time consuming procedures like inser ting blocks. You can create a LISP routine to insert a specific block into your drawing with minimal input. You can u se the block command, but it is more efficient to cut out the many steps it takes simply by using a productive routine.