THIS 22.1

Creating Datum Definitions

The following options can be used to setup DATUM definitions

keyword	second word	notes
start datum		Starts a Datum definition
acronym	acronym	Specifies the datum acronym
label	label	Specifies the datum label
label	2nd label	Specifies the label for the optional second constant datum line
type	constant_x	Defines the datum as a constant x value
	constant_y	Defines the datum as a constant y value
	constant_y2	Defines the datum as a constant y2 value
	Points	Defined the datum as a set of x,y points
value	value	Specifies the value for a constant x, y or y2 datum
2nd value	2nd value	Specifies the optional second value for a constant x, y or y2 datum
num_points	#points x1,y1 y2,y2	Specifies the number of points used to define a datum, followed by pairs of x,y values.
line_colour	colour (see Line Colours )	Specify the line colour used to display the datum line (or none)
line_style	style (see Setting Curve Styles	Specifies the line style used to display the datum line (or none)
line_width	width (see Line Width	Specifies the line width used to display the datum line (or none)
fill_colour1	colour (see Line Colours )	Defines the colour used to fill above/right of the datum line
fill_colour2	colour (see Line Colours )	Defines the colour used to fill below/left of the datum line
fill_colour3	colour (see Line Colours )	Defines the colour used to fill between the two constant datum lines if a second value is present
label_font		Define the font used to display the label
label_size	8,10,12,14,18,24	Define the font point size used to display the label
label_colour	colour (see Line Colours )	Define the colour used to display the label
label_position	Above Centre	Position label at centre above line
	Above Left	Position label on left above line
	Above Right	Position label on right above line
	Below Centre	Position label at centre below line
	Below Left	Position label on left below line
	Below Right	Position label on right below line
	None	Turn off label display
	Middle Left	Position label on left in middle
	Top Left	Position label on left at top
	Bottom Left	Position label on left at bottom
	Middle Right	Position label on right in middle
	Top Right	Position label on right at top
	Bottom Right	Position label on right in middle
label_orientation	Horizontal or Vertical	Orientation of the datum label(s)
label_point	point number	Position label at datum point
end_datum		Ends a Datum definition.

Each DATUM definition must start with a "start_datum" keyword and end with a "end_datum" keyword. Any lines between a "start_datum" and "end_datum" keyword that do not form part of a datum definition are ignored. From T/HIS 17.0 onwards, FAST-TCF variables defined by "define var name value " can be used inside DATUM defitions.

The following creates a DATUM definition at Y=1000.0 with a label "Hic Limit", the area below the line is filled in GREEN and the area above is filled in RED.

START_DATUM
  ACRONYM           datum_1
  LABEL             Hic Limit
  TYPE              constant_y
  VALUE             1000.000000
  LINE_COLOUR       green
  LINE_STYLE        solid
  LINE_WIDTH        normal
  FILL_COLOUR_1     red
  FILL_COLOUR_2     green
  LABEL_FONT        default
  LABEL_SIZE        automatic
  LABEL_COLOUR      foreground
  LABEL_POSITION    default
  LABEL_ORIENTATION Horizontal
END_DATUM

Alternatively a *.dtm file can be read in using the 'inc' keyword, e.g.

inc C:\my_datum_file.dtm

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