Raspberry Pi Gaming 4 Kids (Devoxx4Kids)
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This document discusses setting up a Raspberry Pi for kids to learn coding and game development using Java. It provides instructions on installing Linux and Java on the Pi, connecting a touchscreen and other accessories to build a coding lab kit. The document then demonstrates how to use streams, filters, maps and other Java 8 lambda features to program interactive games and simulations using the Pi kit.
Raspberry Pi Gaming 4 Kids (Devoxx4Kids)
- 1. Raspberry Pi Gaming 4 Kids Stephen Chin (@steveonjava)
- 4. Java and 3G in a Tiny Package > Cinterion EHS5
- 7. Have Java With Your Dessert Raspberry Pi =
- 9. Pis are Affordable A Cake Bicycle (but just 1 wheel) $35 1 Box of Diapers
- 10. Chalkboard Electronics Touchscreen 10" or 7" Form Factor Connects via HDMI/USB Tested with JavaFX 8 10% Exclusive Discount: G1F0U796Z083
- 11. How to Setup Your Pi > Step 1: Install Linux > Step 2: Download/Copy Java 8 for ARM EA > Step 3: Deploy and Run JVM Language Apps http://steveonjava.com/ javafx-on-raspberry-pi-3-easy-steps/
- 12. What Comes in Your Lab Kit Touch Screen SD Card Keyboard Yellow Box: 1. 2. 3. 4. Power Adapter LVDS Cable/Board Raspberry Pi Model B Mini-USB Cable (power) Micro-USB Cable (keyboard) Please Save All the Packaging for Later
- 13. Electronic Safety! > Unplug from wall before wiring > Get rid of static by touching a metal surface > Don't touch exposed wires/metal > Never remove/insert SD Card while power is on 13
- 14. Hooking Up the Pi (Part A) Important: Connect everything before plugging into the wall Insert the SD Card in to the Pi 1. Will appear upside down when looking at the top of your Pi Insert the HDMI board into the Pi's HDMI jack Connect the Pi power to the HDMI board 2. 3. Use the Micro USB Cable (short one) 14
- 15. Hooking Up the Pi (Part B) Slide the LCD cable into the back of the display 4. Side with gold connectors goes up Be careful, the connector is fragile! Connect the USB end to one of the Pi's USB host ports 5. This provides touch input Hook up the USB keyboard 6. 1. Use the Mini USB cable (long one) Verify connections and plug into power now 15
- 16. Is it Working? > Should get a bunch of flashing LEDs to indicate booting > The LCD screen should light up > Boot takes approx 30 seconds Might be dim if the light sensor is obstructed And you will should see a Linux boot screen with lots of text Hacking Time!
- 17. Logging In At the login prompt type your username: > pi And enter the password: > raspberry
- 18. Running Your First Application Change directory to the project folder > cd MaryHadALittleLambda Run the build script > ant
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- 20. Hacking the Code Run the nano text editor: > nano src/sample/MapObject.java Save your changes: > Control-O Enter Exit Nano: > Control-X Compile/Run: > ant
- 21. Mary Had a Little Lambda Mary had a little lambda Whose fleece was white as snow And everywhere that Mary went Lambda was sure to go! https://github.com/steveonjava/MaryHadALittleLambda
- 22. Generating Streams From a collection: > anyCollection.stream(); Known set of objects: > Stream.of("bananas", "oranges", "apples"); Numeric range: > IntStream.range(0, 50) Iteratively: > Stream.iterate(Color.RED, > c -> Color.hsb(c.getHue() + .1, c.getSaturation(), > c.getBrightness())); 22
- 23. Let's Create Some Barn Animals! SpriteView tail = s.getAnimals().isEmpty() ? s : s.getAnimals().get(s.getAnimals().size() - 1); Stream.iterate(tail, SpriteView.Lamb::new) .skip(1).limit(7) .forEach(s.getAnimals()::add); 23
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- 25. Filtering Streams Predicate Expression > public interface Predicate<T> { > public boolean test(T t); > } Filter out minors > adults = attendees.filter(a -> a.getAge() >= 1.8) 25
- 26. Rainbow-colored Lambs! s.getAnimals().stream() .filter(a -> a.getNumber() % 4 == 2) .forEach(a -> a.setColor(Color.YELLOW)); s.getAnimals().stream() .filter(a -> a.getNumber() % 4 == 3) .forEach(a -> a.setColor(Color.CYAN)); s.getAnimals().stream() .filter(a -> a.getNumber() % 4 == 0) .forEach(a -> a.setColor(Color.GREEN)); 26
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- 28. Filtering Collections Collection.removeIf > Removes all elements that match the predicate List.replaceAll > In-place filtering and replacement using an unary operator ObservableCollection.filtered > Returns a list filtered by a predicate this is also Observable 28
- 29. Picky Eaters… Predicate<SpriteView> pure = a -> a.getColor() == null; mealsServed.set(mealsServed.get() + s.getAnimals().filtered(pure).size() ); s.getAnimals().removeIf(pure); 29
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- 31. Mapping Streams Applies a Map Function to each element: > Function<? super T, ? extends R> Result: List is the same size, but may be a different type. 31
- 32. Single Map s.getAnimals().setAll(s.getAnimals() .stream() .map(sv -> new Eggs(sv.getFollowing()) .collect(Collectors.toList()) ); 32
- 33. Or a Double Map! s.getAnimals().setAll(s.getAnimals() .stream() .map(SpriteView::getFollowing) .map(Eggs::new) .collect(Collectors.toList()) ); 33
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- 35. Flat Map Applies a One-to-Many Map Function to each element: > Function<? super T, ? extends Stream<? extends R>> And then flattens the result into a single stream. Result: The list may get longer and the type may be different. 35
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- 38. Reduce Reduces a list to a single element given: > Identity: T > Accumulator: BinaryOperator<T> Result: List of the same type, but only 1 element left. 38
- 39. And the (formerly little) Fox ate them all! Double mealSize = shepherd.getAnimals() .stream() .map(SpriteView::getScaleX) .reduce(0.0, Double::sum); setScaleX(getScaleX() + mealSize * .2); setScaleY(getScaleY() + mealSize * .2); shepherd.getAnimals().clear(); 39
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- 41. Mary Had a Little Lambda Project > > Open-source project to demonstrate lambda features Visual representation of streams, filters, and maps https://github.com/steveonjava/MaryHadALittleLambda 41
- 42. NightHacking Tour Stephen Chin (@steveonjava) http://steveonjava.com/ Real Geeks Live Hacking nighthacking.com
- 43. Safe Harbor Statement The preceding is intended to outline our general product direction. It is intended for information purposes only, and may not be incorporated into any contract. It is not a commitment to deliver any material, code, or functionality, and should not be relied upon in making purchasing decisions. The development, release, and timing of any features or functionality described for Oracle’s products remains at the sole discretion of Oracle.
Editor's Notes
- #2: Feel free to reuse this presentation for your local user groups. Some helpful comments are in the notes section, but feel free to embellish.For more details on JavaFX/Raspberry Pi hacking, check out this post:http://javafx.steveonjava.com/javafx-on-raspberry-pi-3-easy-steps/
- #3: Java embedded technologies are used in a wide variety of embedded devices. This list is just a small sampling of devices that are currently using Java ME and SE Embedded.
- #4: Java embedded technologies are used in a wide variety of embedded devices. This list is just a small sampling of devices that are currently using Java ME and SE Embedded.
- #8: The Raspberry Pi is a consumer-focused, low-cost board. It has a slightly slower ARM processor (ARMv6 700Mhz), but a better GPU than the BeagleBoard. Connectivity is via HDMI/Component, USBx2, Ethernet, and Audio out.
- #12: And getting JavaFX is as simple as downloading Java 7 (it has been bundled since Java 7u4). Also, it is supported across different desktop platforms (shown in the picture).