Adds a line to a VDA Tool. The exact length and position of the line is determined interactively by the user.

tool_name—A string containing the unique name of a VDA Tool.

None.

TmLine is a graphical element (GRAEL) routine. GRAELs are predefined graphics routines used by VDA Tools. These routines allow you to add, configure, and remove graphical elements in the VDA Tool display area. The standard set of GRAELs includes axes, text, bitmaps, legends, lines, and rectangles. This standard set is accessible from the standard VDA Tool menu bar and button bar, which are provided by the VDA Utility routines WoMenuBar Function and WoButtonBar Function.

To create a line, the user presses and drags MB1 to define the endpoints.

The following example code is a callback routine for a menu bar. This callback executes TmLine in response to a menu selection.

PRO CreateLineCB, wid, index

   tool_name = GetMenuBarToolName(wid)

   toggle_buttons = ['dataselect', 'graelselect', 'text', $

      'line', 'rectangle', 'legend']

   buttons_up = [0, 0, 0, 0, 0, 0]

   WoButtonBarSet, tool_name, toggle_buttons, buttons_up

   WoButtonBarSet, tool_name, 'line', 1

   WoAddMessage, tool_name, 'MSG_LineCreate', /Clear

   WoAddStatus, tool_name, 'MSG_LineCreateStatus', $

      Item='STATUS2'

   TmLine, tool_name

END

TmAxis, TmBitmap, TmLegend, TmRect, TmText