BFOIT - Introduction to Computer Programming
Background
jLogo Programming
- Commanding a Turtle
- Pseudocode
- Adding New Commands
- Iteration & Animation
- Hierarchical Structure
- Procedure Inputs
- Primitive Operators
- Defining Operators
- Words & Sentences
- User Interface Events
- What If? (Predicates)
- Recursion
- Local Variables
- Global Variables
- Word/Sentence Iteration
- Mastermind Project
- Multiple Turtles
- Arrays
Java
- A Java Program
- What's a Class?
- Extending Existing Classes
- Types
- Turtle Graphics
- Control Flow
- User Interface Events
Appendices
Lastly
Appendix B (Directives)
TG Programming Environment Directives
Certain commands entered in the CommandCenter window help with the program development process. These commands are not part of the jLogo language = they can't be included in procedures you define. Examples of directives: there is a directive which prints the title lines of all of the procedures you've defined; there is a directive which prints a textual representation of a procedure you specify. In summary, directives help you write and debug programs.
| Program Management (Directives) | |||
| Name | Input(s) | Description | Example |
| [Ctrl]-T | While in the CommandCenter, holding down the [Ctrl] key and pressing the "T" key will print the name of the current turtle and the state of all turtles. | ||
| [Ctrl]-Q | While in the CommandCenter, holding down the [Ctrl] key and pressing the "Q" key will stop program execution - think of Ctrl-Q as a QUIT directive. | ||
|
CT CLEARTEXT |
Erases all of the text in the CommandCenter. | CLEARTEXT | |
| NEWTURTLE | name | Creates a new turtle with the specified name. | NEWTURTLE "t2 |
|
PRINTPROCS PP |
Displays the names and inputs of all procedures that have been defined in the current session in the CommandCenter. | PRINTPROCS | |
|
PRINTTEXT PT |
name | Displays the source code representation of the procedure named name in the CommandCenter. | PRINTTEXT main |
| TALKTO | name | Directs future CommandCenter input to the specified turtle, i.e., makes name the current turtle. | TALKTO "t2 |
| TRACE |
procName varName |
Directs TG to display information every time a specified user-defined procedure is invoked or a specified global variable's value is changed. |
TRACE keyPressed TRACE curNum |
| UNTRACE | name | Cancels the TRACE request for the named procedure or global variable. |
UNTRACE keyPressed UNTRACE curNum |
Go to the Table of Contents
On to jLogo Primitives