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Shuffling with Java

From: Interactive Data Visualization with Processing

Video: Shuffling with Java

The last function I want to show you that deals with randomness in Processing is how to shuffle the items in an array. Now, you would think that this would be an easy thing to do, but unfortunately Processing does not have a built-in shuffle function and I've seen a number of people create rather long Byzantine complicated functions that can do shuffling. On the other hand, there is a shortcut for this and it is because Processing is based on Java and while Processing does not have a built-in shuffle function, Java does and so what I'm going to show is you is how to import a little bit of Java code and run it to shuffle items in an array.

Shuffling with Java

The last function I want to show you that deals with randomness in Processing is how to shuffle the items in an array. Now, you would think that this would be an easy thing to do, but unfortunately Processing does not have a built-in shuffle function and I've seen a number of people create rather long Byzantine complicated functions that can do shuffling. On the other hand, there is a shortcut for this and it is because Processing is based on Java and while Processing does not have a built-in shuffle function, Java does and so what I'm going to show is you is how to import a little bit of Java code and run it to shuffle items in an array.

Let's start by simply putting little comment up here at the top, with the sketch name and then I'm going to put -- I have to import a library and it's the Java utilities and so I write import and then java.util.* and that brings in all of the files within that particular folder and once I get that in, I can then define my array. Now I'm going to use a set of integers, but Java variable names work a little bit differently than in Processing, so if in Processing if I want an array of integers I would do int like that, but in Java, I have to do it slightly differently, I have to use a capital I and I have to spell integer out all the way.

Otherwise, it's the same. I do the opening and closing square brackets, I give the array a name, I'm I can going to call it nums for numbers and then I can do equals and then in curly brackets I'm just going to put five numbers, and so there's the array that I'm going to work with. We can just check how this array looks by using the print line command and you see at the bottom, I'll close this, we don't need that front of this one, we have 1, 2, 3, 4, 5. Now what I'm going to do is call on the special Java function and this one needs to be typed exactly as it appears. Again, capitalization is important.

We start by doing Collections and then dot (.) shuffle and then the thing that we are going to shuffle is the array, so we need to do parentheses and then we do capital A for Arrays and then dot (.) as capital L List and then I put the name of the array that I want to shuffle, in this case it's nums, I close that. That's the parentheses for the name of the array and then I close that for the function and then finish with the semicolon (;) and when I do that I can do print line again for nums, this will print it before and after shuffling you'll see how it looks and now it's printed out twice.

The first one shows the 1, 2, 3, 4, 5, the second time is 5, 4, 2, 3, 1 if I run it again I'll get a different shuffle. Then this 4, 2, 5, 3, 1 and so forth and so this is in fact the easiest way to shuffle an array in Processing and it also gives you tip about using Java. Now I should mention, if you want to get some really strong skills in Processing, using some Java would be a wonderful thing and Lynda.com has two courses that would be particularly useful in learning Java.

The first one is the Java Essential Training, and this would give you a lot of the information that you could then import into using with Processing. And the second one is Up and Running with Java Applications, and with the two of those, I'll be able to bring in some much stronger skills into Processing and have even a broader range of possibilities than you would otherwise.

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This video is part of

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Interactive Data Visualization with Processing

72 video lessons · 12115 viewers

Barton Poulson
Author

 
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  1. 3m 16s
    1. Welcome
      58s
    2. What you should know
      1m 22s
    3. Using the exercise files
      56s
  2. 11m 51s
    1. Overview of data visualization
      11m 51s
  3. 11m 53s
    1. Installing Processing
      3m 38s
    2. Overview of Processing
      4m 5s
    3. Exploring libraries
      4m 10s
  4. 1h 1m
    1. Basic setup
      7m 31s
    2. Drawing points
      4m 37s
    3. Drawing lines
      5m 6s
    4. Drawing ellipses and circles
      5m 24s
    5. Drawing arcs
      6m 54s
    6. Drawing rectangles and squares
      4m 58s
    7. Drawing quadrangles
      3m 25s
    8. Drawing triangles
      2m 55s
    9. Drawing polygons
      3m 37s
    10. Drawing simple curves
      4m 54s
    11. Drawing complex curves
      6m 46s
    12. Drawing Bézier curves
      5m 38s
  5. 54m 3s
    1. Introduction to variables
      10m 44s
    2. Understanding variable scope
      6m 53s
    3. Modifying variables
      9m 8s
    4. Creating arrays
      9m 53s
    5. Modifying arrays
      6m 37s
    6. Creating strings
      7m 3s
    7. Modifying strings
      3m 45s
  6. 1h 2m
    1. Incorporating randomness
      7m 59s
    2. Using Perlin noise
      4m 24s
    3. Shuffling with Java
      3m 30s
    4. Specifying line attributes
      8m 2s
    5. Changing placement modes
      5m 45s
    6. Understanding color attributes and functions
      4m 16s
    7. Exploring color spaces
      7m 44s
    8. Using color palettes
      7m 5s
    9. Transforming the grid
      8m 38s
    10. Exploring the attribute matrix
      5m 33s
  7. 52m 7s
    1. Building code blocks
      5m 57s
    2. Writing a while loop
      3m 52s
    3. Using for loops
      5m 35s
    4. Creating conditionals
      14m 50s
    5. Working with easing
      10m 51s
    6. Creating spirals
      11m 2s
  8. 18m 55s
    1. Mouse tracking
      3m 54s
    2. Hovering and clicking
      11m 16s
    3. Understanding keyboard interaction
      3m 45s
  9. 27m 32s
    1. Specifying fonts
      6m 43s
    2. Using images
      5m 51s
    3. Playing a video loop
      6m 20s
    4. Exporting video
      3m 47s
    5. Adding sound
      4m 51s
  10. 20m 49s
    1. Creating functions
      11m 48s
    2. Creating classes and objects
      9m 1s
  11. 31m 10s
    1. Using embedded data
      5m 26s
    2. Working with appended text data
      6m 4s
    3. Working with appended tabular data
      10m 26s
    4. Reading XML data
      9m 14s
  12. 48m 17s
    1. Generating dot plots
      11m 11s
    2. Building scatter plots
      10m 0s
    3. Making line plots
      9m 55s
    4. Creating bar charts
      9m 12s
    5. Checking out examples of maps, hierarchies, and networks
      7m 59s
  13. 20m 57s
    1. Introducing some principles of 2D design
      13m 44s
    2. Understanding color theory
      7m 13s
  14. 24m 46s
    1. Interacting with zooming, rotating, and sliding
      6m 26s
    2. Implementing slicing
      6m 47s
    3. Using rollovers
      5m 58s
    4. Introducing the GUI libraries
      5m 35s
  15. 10m 35s
    1. Sharing via OpenProcessing and other sites
      3m 19s
    2. Saving as a desktop application
      2m 42s
    3. Saving as JavaScript
      1m 47s
    4. Saving as an Android application
      2m 47s
  16. 2m 38s
    1. Where to go from here
      2m 38s

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