CS1315: Introduction to Media Computation

CS 100 Introduction to Computing Introduction to JES Developed by Mark Guzdial, Georgia Institute of Technology, 20032004; modified by Robert H. Sloan & Pat Troy, University of Illinois at Chicago, 2005, for educational use. Installation Installing JES and starting it up Windows users:

Mac OS X users: Just copy the folder from the CD Double-click JES application Just drag (i.e., copy) JES from Mac folder into your Applications

Double-click JES application Enter a blank in the form for turnin (we probably wont use) There is always the Help Menu (Take a look at it) Lots and lots of excellent help We will program in JES

JES: Jython Environment for Students A simple editor (for entering in our programs): Well call that the program area A command area for entering in commands for Python to execute. JES - Jython Environment for Students Program Area Command Area Tour of JES

Save and Save As Cut/Copy/Paste with shortcut keys Turnin TA will give instructions for submitting your Jython This will start with Lab 10; theyre in the lab Help

Explain is contextualized help: Highlight a JES (media) function Lots of help on mediatools and the like Python understands commands We can name data with = (assignment operator) We can print values, expressions, anything with print

Using print in JES >>> print 34 + 56 90 >>> print 34.1/46.5 0.7333333333333334 >>> print 22 * 33 726 >>> print 14 - 15 -1 >>> print Hi" Hello >>> print Hi" + Bob!" HiBob!

Command Area Editing Up/down arrows walk through command history You can edit the line at the bottom Just put the cursor at the end of the line before hitting Return/Enter. Demonstrating JES for files and sounds >>> print pickAFile() /Users/guzdial/mediasources/barbara.jpg

>>> print makePicture(pickAFile()) Picture, filename /Users/guzdial/mediasources/barbara.jpg height 294 width 222 >>> print pickAFile() /Users/guzdial/mediasources/hello.wav >>> print makeSound(pickAFile()) Sound of length 54757 >>> print play(makeSound(pickAFile())) None >>> myfilename = pickAFile() >>> print myfilename /Users/guzdial/mediasources/barbara.jpg >>> mypicture = makePicture(myfilename) >>> print mypicture Picture, filename /Users/guzdial/mediasources/barbara.jpg height 294 width 222

>>> show(mypicture) Writing a recipe: Making our own functions To make a function, use the command def Then, the name of the function, and the names of the

input values between parentheses ((input1)) End the line with a colon (:) The body of the recipe is indented (Hint: Use two spaces) Thats called a block Making functions the easy way

Get something working by typing commands Enter the def command. Copy-paste the right commands up into the recipe A recipe for playing picked sound files def pickAndPlay(): myfile = pickAFile() mysound = makeSound(myfile) play(mysound) Note: myfile and mysound, inside pickAndPlay(), are completely different from the same names in the command area.

Blocking is indicated for you in JES Statements that are indented the same, are in the same block. Statements that are in the same block as where the line where the cursor is are enclosed in a blue box.

A function for playing picked picture files def pickAndShow(): myfile = pickAFile() mypict = makePicture(myfile) show(mypict) The Most Common JES Bug: Forgetting to Load Your function does NOT exist for JES until you load it

Before you load it, the program is just a bunch of characters. Loading encodes it as an executable function Save and Save As You must Save before Loading

You must Load before you can use your function What if you forget your variable names? showVars() JES - Help Menu The help menu is very very useful. Before you start, make sure you take a look at Getting Started with JES and Programming in Jython. MOST IMPORTANT THING TO DO TO PASS THIS CLASS!

DO THE EXAMPLES! Try them out for yourself. Try to replicate them. Understand them EVERY WEEK, TYPE IN AT LEAST TWO OF THE EXAMPLES FROM CLASS and/or THE TEXTBOOK

To understand a program means that you know why each line is there. You will encounter all the simple-but-confusing errors earlyBEFORE you are rushing to get homework done!!

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