Surveyor User's Guide

7-21

Capture and Display Filters

Multi-State and Multi-Statement Filters

Filter Statements

To create statements, press the button from the Filter States Design window.

Use the window that appears to create a condition and to specify actions to be taken

if the condition is satisfied. Once a condition is true, the next condition is not exam-

ined. For the next frame you remain in the current state or go to a different state,

depending on the GoTo action specified in the statement. If no condition is met, the

actions in the ELSE statement are taken.

For IF or ELSE IF statements, the conditions of the statement are created using

the

Filter Design window. If you are adding a statement, you cannot load the filter

until you return to the

Filter States Design window. The Load Filter and Unload

Filter buttons on the Filter Design toolbar are disabled.

The window for the ELSE statement specifies the actions when no conditions for

previous statements are satisfied. You can only specify actions and the next state to

execute.

Table Table 7-8 shows a synopsis of the logic sequence for statements:

Table 7-8. Logic Sequence for Capture and Display Filter Statements

Logic Sequence Description

IF statement IF (these conditions are satisfied) THEN (take these actions, go to

State n)

ELSE IF statement ELSE IF (these conditions are satisfied) THEN (take these actions, go

to State n)

ELSE IF statement ELSE IF (these conditions are satisfied) THEN (take these actions, go

to State n)

The ELSE IF statement can appear multiple times.

ELSE statement ELSE (take these actions, go to State n)