CSC302 2007S, Class 07: Getting Started with Script-Fu

Overview:
* About this week.
* Lab.

Admin:
* Thursday at 4:30, CS Extra on a Web-Based Campus Map.
  * Come support Eric and Monica
  * Come make fun of Jonathan, anyway
* I've removed your names from all of the readings pages.  
  From now on, I'll simply send you your grade via email.  
  (Q&A will still end up on those pages.)
* Yes, you need to respond to readings by SamR, too.
  * Today's responses will be accepted late.
* Are there questions on HW3?
* A few of you have mentioned that you'd like to discuss HW2.
  * What questions do you have?
* Wednesday's reading is only available online.  
  * Since it's mine, I need not worry about copyright issues.
  * It's less dense, so I'm not sure you need to mark it up.
  * Available through the HOG link.
* Friday's reading will be available on Wednesday.

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/About this Week/

* What
  * Playing with Script-Fu and the GIMP
  * Lots of lab-based stuff
  * Plus some prepartory readings
  * Based closely on 151 stuff.
* Why
  * Reflect on different kind of language
    * Scripting language
    * Domain: Graphics
  * More experience with HOP
    * A key aspect of functional languages
    * Functions that have other functions as parameters
    * Functions that return other functions as values
    * Key examples:
      * compose
      * map
      * fold - insert a binary operator between pairs of values
      * apply
      * left-section and right-section
* Schedule:
  * Today: Get your feet wet with Script-Fu
  * Wednesday: Pixel-oriented tasks
  * Friday: Drawing-oriented tasks (representing drawings)

Detour: OOP vs FP
* Vector<Int> foo;
* (map (lambda (x) (* x x)) foo)
* Vector<Int> grades;
* (map (lambda (x) (x.increment(3))) grades)

/Lab Q&A/

* Why do some functions affect only an image, and others
  affect the global drawing space?
* Why aren't the functions all documented?