ruby lofi

A talk about a project I worked on. Also an encouragement for the audience to take on a programming project.

1. ruby lofi
2. hello, my name is zach
3. i made this thing called ruby lofi
4. a project
5. this is about that but also about u u and ur projects
6. projects
7. do u have a project?
8. not “work” for fun for “joy” to use ruby
9. choose ur own adventure
10. code style tests be ur own boss RELAX and HAVE FUN
11. how 2 get started?
12. inspiration
13. 2 scenarios u have an idea or u don’t
14. scenario 1 idea
15. is it a good* idea?
16. *good = ?
17. not “work” for fun for “joy” to use ruby
18. think small odds of success go up as complexity and size go down
19. maybe think “this should take a couple weeks/months”
20. maybe avoid “this should take a couple years”
21. but it’s ur choice
22. what if u don’t have an idea?
23. scenario 2 no idea
24. ask ppl for ideas
25. “do u have a problem I can solve?” “do u have an idea I can bring 2 life?”
26. maybe this yields nothing …then what?
27. random words > gems let the universe guide u
28. so now you have an idea …what’s next?
29. getting started
30. confession: i did not “make” ruby lofi
31. ruby2d 4 graphics ruby-audio 4 wavs beats 4 sequencing
32. …on the shoulders of giants…
33. do some research
34. not just gems but concepts
35. ex: normalize algorithm
36. ??
37. stackoverflow
38. 2 concepts in ruby lofi
39. digital audio
40. digital audio is not mysterious
41. it’s just numbers
42. [0.0, 0.23, 0.37, 0.44, 0.31, 0.18, -0.05, -0.21, -0.36, -0.50, -0.39, -0.18, 0.0]
43. three concepts: frequency amplitude sample rate
44. frequency
45. 1 Hertz is 1 cycle per second
46. [0.0, 0.23, 0.37, 0.44, 0.31, 0.18, -0.05, -0.21, -0.36, -0.50, -0.39, -0.18, 0.0]
47. A = 440
48. amplitude
49. power!!
50. [0.0, 0.23, 0.37, 0.44, 0.31, 0.18, -0.05, -0.21, -0.36, -0.50, -0.39, -0.18, 0.0]
51. too much power == clipping
52. frequency vs amplitude is count vs strength of sound waves
53. sample rate
54. samples per second
55. POP QUIZ: what is standard “cd quality” sample rate?
56. 44100 samples per second
57. [0.0, 0.23, 0.37, 0.44, 0.31, 0.18, -0.05, -0.21, -0.36, -0.50, -0.39, -0.18, 0.0]
58. sample rate != frequency sample rate != amplitude 44100 samples per second of a 440 Hz tone
59. computer audio is just manipulating arrays of numbers that represent sound wave frequency and amplitude at a certain sample rate
60. i = 0 while i < samples.count do percent_fade = i / samples.count.to_f samples[i] = samples[i] * percent_fade i += 1 end
61. now ur an audio expert
62. graphics
63. what do u need to make graphics?
64. 3 things
65. render basic elements lines rectangles circles triangles text
66. a coordinate system x and y for 2d x, y, and z for 3d
67. update loop handle input redraw window
68. with these things we can make a graphical interface
69. ex: make a button rectangle for clickable area rectangle for border text for label click handler
70. x, y = event.x, event.y b = Button.new label: “click me” if b.x < x && b.x + b.width > x && b.y < y && b.y + b.height > y puts “clicked button!” else puts “am lonely” end
71. now u are a graphics master
72. now back to our projects
73. making progress
74. so you’re making something
75. but then it gets difficult
76. the “easy” stuff is done
77. maybe u start to flail
78. - - - - - - - - - - - ->
79. ex: ruby lofi “it’s about audio”
80. so why did I spend WAY more time building overly complicated UI elements?
81. i lost focus
82. i have no answers but 1 suggestion
83. stop work show what u have ask 4 feedback
84. stay happy find “joy”
85. demo
86. making a beat stitching beats
87. things 2 remember
88. wavs only
89. always “build” before playing/saving!
90. keyboard right/left (and shift + right/left) 2 adjust selection
91. shift + click 2 reset selection endpoint (but keep start)
92. challenge
93. 1. get “sox” (see website)
94. 2. git clone https:// github.com/robobluebird/ruby- lofi
95. 3. cd ruby-lofi unzip sounds.zip cd .. don’t forget this!
96. 4. ruby ruby-lofi/app.rb
97. now make a beat!
98. contest
99. submit to schroza@gmail.com OR tweet to #rubyconf #lofi
100. top 3 (decided by me) win an Arduino Nano
101. if u want to try but need help just ask!
102. thank u for ur attention
103. ©2018 General Dynamics. All rights reserved. We’re Hiring!!! • https://gdmissionsystems.com/about-us/major-locations/pittsburgh 103 14 November 2019