CSC 151.01, Class 16: Making and Manipulating Lists of Drawings

Overview

• Preliminaries
  • Notes and news
  • Upcoming work
  • Extra credit
  • PSA
  • Questions
• Quiz
• Lab

News / Etc.

• Continue partners!
• I will go through a few issues quickly before the quiz.
• You will likely need to finish today’s lab on your own, but I will be happy to answer questions about the lab via email or at the start of class on Monday.

Rotating reminders

• Suggest extra credit! Send me extra credit ideas and opportunities. (Yes, this is a good way to get credit for some of the things you’re already planning to do.)

Upcoming Work

• Assignment 4 due Tuesday at 10:30 p.m.
  • Your partner for today’s class is your partner for the assignment.
• Lab writeup, problem 2, due Monday before class.
• Reading: Boolean values and predicate procedures

Extra credit (Academic/Artistic)

• CS Table, Tuesday at noon, 21 Feb 2017. Net neutrality. Reading packets should be available outside Curtsinger’s office or Orsera’s office.
• New Thursday extras, Thursday, 16 Feb 2017, 4:15 p.m., Science 3821: The Future of MathLAN
• New Met Opera Live in HD showing of Rusalka, Saturday, Feb. 25. Talk 11:30-noon, opera noon-3pmish.
• New Prazak Quartet, Tuesday, 28 February 2017, 7:30 p.m., Herrick.

Extra credit (Peer)

• Friday-Saturday-Sunday, 17th-19th, Swimming and diving conference championships. (You can only get credit for two of the three days; staying for an hour counts.)
• Saturday the 18th, Symphony Concert. 2-4 p.m. Sound painting and more! In Sebring-Lewis.
• Art house print making and cookie decorating event. Saturday February 18th, 1-3PM on JRC 227.
• Pun Club Saturday at 4pm in the Secret Younker 1st Floor Lounge Location. (You only get credit for this once.) (Moderation in all things.)

Good things to do

• Women’s basketball (Senior day) next Saturday at 1pm.
• Men’s basketball (Senior day) next Saturday at 3pm.
• Slavic coffee house, Saturday, 5:30-7:00 p.m. Bucksbaum Rotunda.
• Grinnell Equestrian Club Drill Team bake sale, 20 February 2017, 11am-2pm and 4pm-9pm.

Less good things to do

• NEW 24 hours of theatre, starting 8pm tonight. psm@grinnell.edu. Writers write tonight. Directors and actors attempt to put it together tomorrow.

Friday PSA

• Plan and reflect.
• Be moderate.
• Get consent.

Questions

Questions on HW4

Do we really have to do eighteen-billion tests for each of the kinds of

shapes we can make?

No. Do a few tests for each kind of shape. Then do the large number of tests for one of the shapes

Questions in preparation for the quiz

Why do we see only a quarter circle?

Because we only render the part of the drawing that fits within the “image rectangle”?

How do I know what’s in the “image rectangle”?

The top-left of the image rectangle is (0,0). It has the width and height specified by drawing->image.

What happens if I scale the unit circle by 20?

You get a new circle centered at (0,0) with diameter 20.

What happens if I scale that new circle by 2?

You get a new circle centered at (0,0) with diameter 40.

Why does the “unit circle” have a diameter of 1?

Because Mathematicians got it wrong when they thought it had a radius of 1.

What does it mean when Gimp says that it has a “dying plugin”?

Sam’s code for coordinating Gimp and DrRacket is buggy.

What happens when you shift and then scale?

Scale scales every aspect of the drawing: width, height, position

Does horizontal scaling affect the vertical position?

It shouldn’t.

If ….

Maybe

Lab

• Don’t forget to download the starting code (in the preliminaries).

Writeup

Write up exercise 2 from the lab on lists of drawings.

Send your solution to csc151-01-grader@grinnell.edu.

Title your email CSC 151.01 Writeup for Class 16 (YOUR FULL NAMES).