## proc line

Version 2.32
Scripts

Manual page for proc_line(PL)

proc line may be used to draw arbitrary lines in scaled space or absolute space.`` It is typically used for annotations, etc.`` To plot a line or curve from data, see proc lineplot.`` See also proc drawcommands.``

## Attributes

The `points` attribute must be specified.``

points multiline-text

  A list of points. One or more lines. Ends at first empty (blank) line. Each line may have one coordinate pair or two. If two, the first point is the beginning of a line, and the second point is the end of a line. If one, the point is taken as a continuation of line from previous point.``
  Example 1:

      points:	1.0 3.0 1.0 4.5
      	3.0 4.5
      	3.0 3.0

  Example 2: With `locval` notation (the default), you can do things like this:

      points: min 0(s) max 0(s)

  More info on locval notation

notation `absolute | scaled | locval`

  Specifies whether points are to be taken as locations in absolute space, scaled space, or location values.`` Default is `locval`.``
  Example: `notation: scaled`

linedetails linedetails

  Details controlling the rendering of the line.
  Example: `linedetails: width=3 color=green`

anchor x y

  If specified, the `points` still specifies how the lines are to be drawn, but lines are drawn relative to x, y. x and y should be in absolute space.`` Does not work for values in scaled space, so `notation` should be `absolute` or `locval` with no `(s)` values.`` This can be used to specify elaborate sets of `points` once, then render the figure multiple times in different locations. Versions 2.31+
  The following example draws a 1" square in two locations:

        #proc line
          #saveas D1
          anchor: 2 3
          points: 0 0 0 1
                  1 1
                  1 0
                  0 0

        #proc line
          #clone D1
          anchor: 4 4

  data display engine
  Copyright Steve Grubb

Markup created by unroff 1.0, `` `` August 23, 2005.