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10-14-22 add image for creating new timer variable

Westside Robotics
2022-10-14 22:09:19 -07:00
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Timers-in-FTC-Blocks.md

@ -31,12 +31,20 @@ In general you will create your own timer, then use pre-made commands or <u>meth
## Create a Timer
The first step is to create a new timer <u>object</u>. Here we call the new timer object "myTimer". You could think of it as "My New Stopwatch" (although Blocks timers don't actually stop).
The first step is to create a new Variable, called "myTimer" (or any other name that suits its purpose in your OpMode).
> **Programming note:** In Java, an Object is an <u>instance</u> or example of a Class. FTC Blocks provides a class called ElapsedTime. A class can contain variables and methods (commands). Your new timer is an instance of that Java class, inheriting its characteristics.
<p align="center">[[/images/Timers-in-FTC-Blocks/0115-create-variable.png|]]<p>
But "myTimer" will not be an ordinary variable that stores a number, or text, or Boolean value.
From the Variables menu, and from the ElapsedTime menu, create this Blocks command:
<p align="center">[[/images/Timers-in-FTC-Blocks/0120-set-myTimer.png|]]<p>
Now "myTimer" is a timer <u>object</u>, which you can think of as "My New Stopwatch" (although Blocks timers don't actually stop).
> **Programming note:** In Java, an Object is an <u>instance</u> or example of a Class. FTC Blocks provides a class called ElapsedTime. A class can contain variables and methods (commands). Your new timer is an instance of that Java class, inheriting its characteristics.
This is not the usual Blocks "Set" command. Instead of assigning a number to a variable, this Block creates or <u>instantiates</u> a new object called myTimer. The Java keyword <u>new</u> causes myTimer to be created as an instance of the class ElapsedTime.
The default unit of reporting time is Seconds, for a timer created with the simple Block shown above. An option for Milliseconds is discussed far below.
@ -288,3 +296,8 @@ This tutorial described basic use of Timers in Blocks programming. Timers also
<br><i>Questions, comments and corrections to: westsiderobotics@verizon.net</i>
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