Agilent Technologies 4294A Service Manual download pdf (Page 152)

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152 Chapter 11

Using HP Instrument BASIC

Displaying Graphics

You can draw graphics on the screen of the 4294A by use of HP Instrument BASIC.

the 4294A has two screens, that is, the instrument screen and the graphics screen. These

screens are both always displayed on the LCD, and you cannot choose either of them to

display. The instrument screen is made up of the area for displaying traces and the area for

displaying softkey labels. The Instrument BASIC editor is also displayed in the area for

displaying traces. The graphics screen covers the whole instrument screen as shown in

Figure 11-1. The graphics screen allows what are displayed on the instrument screen to

pass through as a transparent sheet, so you can draw graphics independently anywhere in

the area for displaying traces and the area for displaying softkeys.

Figure 11-1 The screen makeup of the Agilent 4294A

A point on the graphic screen can be specified by the coordinates shown in Figure 11-1.

The lower left corner of the screen corresponds to the origin (0, 0) and the upper right

corner of the screen corresponds to the point (590, 421). You give these coordinates to the

parameters in the MOVE and DRAW statements.

Graphics commands of Instrument BASIC

The 4294A HP Instrument BASIC offers three graphics-related commands; MOVE,

DRAW, and GCLEAR.

MOVE Moves the pen from the current pen position to the point specified by

the coordinates given as a parameter.

DRAW Draws a straight line from the current pen position to the point

specified by the given coordinates.

GCLEAR Clears the graphics screen, and moves the pen to the origin.

NOTE After initializing the graphics screen by use of GCLEAR, you can execute the MOVE

command and the DRAW command up to 1998 times. Even if you execute the MOVE

command and the DRAW command after that, nothing will be drawn.

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