The Line Type Instruction, Lt - HP 7470A Interfacing And Programming Manual

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^he Line Type Instruction, LT
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WMHilUlfin The line type instruction, LT, specifies the type of line
that will be used with PA and PR commands.
This instruction can be used with PA and PR commands to
draw dashed or dotted lines. This facilitates trace differentiation on
multiple-line graphs and enables emphasis or deemphasis of plotted
lines or grids. One line type causes only dots to be plotted at each data
point.
M'<iin:i ix pattern number (.pattern length) (terminator)
or
LT (terminator)
ISiaMi'MIHKI Shown below are the line patterns and their pattern
numbers.
E^3
The pattern number parameter is in decimal format but is truncated to
an integer. This parameter should be between 0 and 6; a parameter in
this range sets the line type as shown in the preceding illustration. A
parameter in the range 7 to 127.9999 is ignored; the line type does not
change and no error is set. A parameter 128 or greater sets error 3 and
the line type does not change. A negative parameter between 0 and
-128 defaults to a solid line type and no error is set. A negative
parameter less than —128 sets error 3 and the line type does not change.
When the first parameter is between 0 and 127.9999, the second param­
eter is used. This optional pattern length parameter is in decimal
format. Both integer and fractional parts are used. This parameter
specifies the length of one complete pattern and is expressed as a per­
centage of the diagonal distance between the scaling points PI and P2.
When this parameter is positive and less than 127.9999, the pattern
length is set to this length. When this parameter is negative or is
greater than or equal to 128, the previous pattern length is used and
error 3 is set. If a pattern length parameter is not specified, a length of
4% is used.
NOTE: If a vector ends in the pen-up portion of the pattern, a pen down
command, PD, will not physically put the pen down until the next
vector command is executed and the pen has moved so it is in a pen-
down portion of a pattern segment. The pen up command clears the
carry-over portion of a pattern segment. ■
specifies dots only at the points that are plotted.
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1 1
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l
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1
One pattern length
£3
No parameter (Default Value)
) The shaded portion of each of the line patterns above is one complete
segment of the pattern.
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ENHANCING THE PLOT
ENHANCING THE PLOT 4-7