Using Graphics Windows

Two window commands are provided for drawing on a limited and controlled area of the display: IWINDOW and DWINDOW. Use IWINDOW (instrument window) to increases or decreases the area on the screen dedicated to displaying OSA measurement results. Use DWINDOW to create a graphics window for drawing. DWINDOW cannot be used when displaying variables, grids, or text with the DSPLY, GRID, or TEXT commands.

Reducing the size of the graticule using IWINDOW leaves more room for messages and other graphics at the sides of the display screen.

Create a reduced display window using the following program.

20

CLEAR 723;

 

 

 

30

OUTPUT

723;"IP;SNGLS;TS;ANNOT OFF;"

 

 

40

OUTPUT

723;"SP 10NM;"

Set span.

 

50

!

 

 

 

 

60

OUTPUT

723;"IWINDOW 1000,800;"

Reduce display area for mea-

 

 

 

 

 

surement

results .

70

OUTPUT

723;"PU;PA

0,955;PD;"

Position

pen.

80

OUTPUT

723;"TEXT$SIGNALS FOUND:$;"

Write text.

90

!

 

 

 

 

100

FOR N=1 TO 3

 

 

 

110

OUTPUT

723;"CENTERWL ";(N*300);"NM;TS;"

Set center wavelength. Sweep

 

 

 

 

 

trace A.

 

120

OUTPUT

723;"MKPK

HI;"

Mark highest signal level.

130

OUTPUT 723;"PU;PA

20,";(955-N*45);";PD;"

Position

pen.

140

OUTPUT 723;"DSPLY

";N;",3,0;"

Label signal.

150

OUTPUT 723;"TEXT $AMPLITUDE = $;"

 

 

160

OUTPUT 723;"DSPLY MKA,6,1;"

Print amplitude .

170

OUTPUT 723;"TEXT$ dBm$;"

 

 

180

NEXT N

 

 

 

 

The DWINDOW command creates a graphics window on the display. The window has a coordinate system that you specify. Use the window for viewing re-sized measurement results, graphics, or traces. DWINDOW ￿rst speci￿es the physical size of the window in the current scale units. (As before, current scale units are either default values of 0 to 1000 for X and Y coordinates, or are speci￿ed by the SCALE command.) DWINDOW then de￿nes a scale for the new coordinate system within the window. For example, the following program lines draw two boxes. One box is on the default coordinate system. The other box (using the same coordinates) is

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