The document discusses various programming concepts including using the modulo operator to create counter variables, generating random numbers, Perlin noise, and converting between radians and degrees. It also previews demos on fireflies and drawing on arcs. Students are assigned to read about additional mathematics topics for the next iteration of the class which will include student presentations in one week.

1. From last time…
• Added a PONG countdown and sound effects!
• Minim: AudioPlayer vs. AudioSample!
• Briefly discussed external libraries & debugging!
• Homework 3 was graded and returned

2. CAP
Mathematics I

3. % Modulo Operator
• Use modulo to make “counter” variables!
• Similar to division but returns the remainder!
• The remainder never be greater than the divisor
0 % 3 0 R0 0
1 % 3 0 R1 1
2 % 3 0 R2 2
3 % 3 1 R0 0
4 % 3 1 R1 1

4. random() Numbers
• random(high); OR random(low,high);!
• Weighted randomness: we’ve seen this many
times before!

5. Perlin noise()
• noise(x);
• noise(x,y);
• noise(x,y,z);
• We have to feed it a “time” value!
• Always returns a float between 0 and 1

6. Demo!
Fireflies

7. Radians & Degrees
• Radians = 2 π ( Degrees / 360 )!
• float myRadians = radians(360); // 6.2831…
• float myDegrees = degrees(TWO_PI); // 360.0
• QUARTER_PI HALF_PI PI TWO_PI TAU
• sin(); cos(); tan();

8. Demo!
Drawing on Arcs

9. For next time…
• Iteration 2: we present in 1 week!!
• Reading: Shiffman, p. 214–225 (Mathematics II)