Midpoint of an Existing Straight Line or Arc

Example

NEW STRA

FPT MIDPOINT OF @

TPT MIDPOINT OF @

(or NEW STRA DEF MIDPOINT OF @ MIDPOINT OF @)

Here, the line would take its endpoints as the midpoints of the two hit items. If the two hit items were an arc and another straight line then the situation could be as shown in Figure 20:2 below.

Figure 20:2. Use of the MIDPOINT Construction

The required midpoint could also be that of one side of a closed polyline primitive, for example, a rectangle. Line definitions of other elements (such as a line that comprises a piece of a design item shown in a VIEW) can be extracted by cursor. As well as using a cursor hit, the STRA or ARC may be identified explicitly.

Note: Note that with this variation of the MIDPOINT syntax, the presence of the OF keyword is mandatory.