functions, variable scope

1. TEA M TEAL
LIZ RUTLEDGE
DAY 8 rutle173@newschool.edu
August 10, 2011 esrutledge@gmail.com

2. agenda.
Review: Learn:
all that hard stuff. FUNCTIONS! (woooooooot)
namely: namely:
for loops breaking down logic into
mouse/keyboard interaction custom functions
if statements variable scope
boolean “switches”
DAY 8
Tuesday, 10 Aug 2011
CODE
bootcamp 2011

3. homework
now wasn’t that fun?
googly eyes!
questions?
let’s look at a few!
review:
mouse interaction variables and
functions
the constrain() and dist() functions
trigonometry (*gasp!*)
anything else?
DAY 8
Tuesday, 10 Aug 2011
CODE
bootcamp 2011

4. functions!
breaking down logic into reuseable little
building blocks
the concept:
being able to separate out bits of logistics/syntax from your code
to achieve several different results. notable benefits include:
modularity: getting to reuse bits of code from place to place
(like variables on crack)
readability: by separating out all the crazy math and logic
you can more easily see what’s going on when skimming back
through
DAY 8
Tuesday, 10 Aug 2011
CODE
bootcamp 2011

5. how functions work.
a quick example.
void setup(){ void setup(){
size(400,400); this: size(400,400);
strokeWeight(2); strokeWeight(2);
fill(255); fill(255);
} }
void draw() { void draw() {
//set fill orange momentarily drawOrangeCircle();
fill(255, 120, 0);
//remove stroke momentarily //white square with 2pt stroke
noStroke(); rect(100, 100, 50, 50);
//draw circle
ellipse(50,50,20,20); drawOrangeCircle();
//replace stroke }
strokeWeight(2);
//replace fill void drawOrangeCircle() {
fillv(255); //set fill orange momentarily
fill(255, 120, 0);
//white square with 2pt stroke //remove stroke momentarily
rect(100, 100, 50, 50); noStroke();
//draw circle
//set fill orange momentarily ellipse(50,50,20,20);
fill(255, 120, 0); //replace stroke
//remove stroke momentarily
noStroke(); turns strokeWeight(2);
//replace fill
//draw circle
ellipse(50,50,20,20);
into }
fill(255);
//replace stroke
strokeWeight(2);
this:
//replace fill
fill(255);
}
DAY 8
Tuesday, 10 Aug 2011
CODE
bootcamp 2011

6. variable scope.
functions aren’t all fun and games.
the concept:
“what happens in brackets stays in brackets”
in english please?
variables defined INSIDE a function can only be used inside THAT
PARTICULAR function. (hint: think the i incrementing variable in a for loop)
variables defined OUTSIDE of a function can be used in that and any
other function on that same level. (we’re specifying “on that same level” because
you can actually have a function...INSIDE a function. but we won’t worry about that yet.)
DAY 8
Tuesday, 10 Aug 2011
CODE
bootcamp 2011

7. homework.
due Thursday, August 11th.
brainstorm!
think about your final project ideas
play around with potential tools/techniques you might want to use
also:
catch up on any oustanding assignments
DAY 8
Tuesday, 10 Aug 2011
CODE
bootcamp 2011