add_hline( [ChipsId,] y [,attributes])

Description

• ChipsId - an optional ChipsId structure containing values to modify the currency state for the command.
• y - the location along the vertical axis through which the horizontal line should pass; the current coordinate system is used if one is not specified.
• attributes - optional parameters which allow the user to configure properties though a structure, list, or attribute string.

The add_hline command creates a horizontal line at the specified y location. The location of the line can be specified in data, pixel, frame, or plot normalized coordinates. The line extends infinitely along the horizontal. It is clipped appropriately by its coordinate system (e.g. lines in data coordinates or plot normalized will be clipped at plot boundaries).

This command is the same as creating a horizontal line segment with add_line ("ahelp py.chips add_line") and setting the "extend" property so that it extends both ends of the line; see the Line Extend section of "ahelp py.chips chipsopt" .

Customizing the Line

There are several attributes that control the line characteristics. The attributes can be set to the ChIPS defaults, values provided in the add_hline command, or values from the user's preference file.

The attributes may also be modified with the set_line command at any time; see "ahelp py.chips set_line" and "ahelp py.chips setget" for more information.

The attributes associated with lines are:

Attribute	Description	Options	Default
color	line color	see the Color section of "ahelp py.chips chipsopt"	default: white in the ChIPS window, black on printout
depth	Integer value indicating line depth	see the Depth section of "ahelp py.chips chipsopt"	100
stem	stem used for line id	alphanumeric	line
style	stipple pattern used to draw the line segment	see the Line Style section of "ahelp py.chips chipsopt"	chips_solid
thickness	line thickness	see the Thickness section of "ahelp py.chips chipsopt"	1

chips> add_hline(.1)

chips> settings = ChipsLine()
chips> settings.color = 'blue'
chips> settings.thickness = 8.0
chips> settings.stem = 'MyLine'
chips> add_axis (XY_AXIS, 0, 0, 200)
chips> add_hline(100,settings)