SPOT 4.1 Basic and Advanced Software Manual for SPOT Insight ...

Ch. 13 - Macro ScriptingGeneric Example using ElseWhen the ELSE Command follows an IF Command, it is the default command should the IFCommand turn out to be false. In this “false” case, the command following the ELSE Commandis executed. Interestingly, Example X, cited earlier (and below), includes an implicit ELSECommand. When the IF Command was proven false, Command A1 was omitted, and CommandB1 was carried out. Could the program just as well been written as the following Example X.1?Example XIF CommandCommand A1Command B1Command C1Command…≠Example X.1IF CommandCommand A1ElseCommand B1Command C1CommandThe answer is no! There is a difference. In Example X, Command B1 is carried out afterCommand A1 when the IF Command is true or when it is false. In the Example X.1, CommandB1 will not get carried out if the IF Command proves to be true. Instead, Command A1 will becarried out, followed by Command C1, etc. In Example X.1, with the Else Command, thesubsequent command (Command B1) is only carried out if the IF Command is false. Therefore, inExample X.1, a choice between Commands A1 and B1 is made. In Example X, the only choice iswhether to carry out Command A1 or not. Command B1 will always be implemented.The same use of the Else Command can be applied with blocks.Example ZIF CommandBegin BlockCommand A1Command A2Command A3End BlockBegin BlockCommand B1Command B2Command B3End BlockCommand C1Command…≠Example Z.1IF CommandBegin BlockCommand A1Command A2Command A3End BlockElseBegin BlockCommand B1Command B2Command B3End BlockCommand C1Command…User Guide to the SPOT Insight Camera 249