euglena/src/LEDControl.java

import processing.core.*;
import static processing.core.PApplet.*;
import cc.arduino.*;

class LEDControl {
    final int comRate = 57600;

    Arduino arduino;
    boolean[] state = {false, false, false, false};

    LEDControl(PApplet applet, int whichArduino) {
        // Arduino - initialize correct arduino
        String[] arduinos = Arduino.list();
        if (arduinos.length == 0) {
            println("There are no arduinos available for use.");
            applet.exit();
        } else {
            println("Available arduinos:");
            for( String ard : arduinos) {
                println(ard);
            }
            print("Using arduino ");
            println(arduinos[whichArduino]);

//            this.arduino = new Arduino(applet, arduinos[whichArduino], comRate);
//
//            for (Direction dir : Direction.values()) {
//                this.arduino.pinMode(dir.pin, Arduino.OUTPUT);
//            }
        }
    }

    boolean isActive(Direction dir) {
        return this.state[dir.index];
    }

    void turnOff(Direction dir) {
        this.arduino.digitalWrite(dir.pin, Arduino.LOW);
        this.state[dir.index] = false;
    }

    void turnOn(Direction dir) {
        this.arduino.digitalWrite(dir.pin, Arduino.HIGH);
        this.state[dir.index] = true;
    }

    void toggle(Direction dir) {
        if (isActive(dir)) {
            turnOff(dir);
        } else {
            turnOn(dir);
        }
    }

    void allOn() {
        for (Direction dir : Direction.values()) {
            turnOn(dir);
        }
    }

    void allOff() {
        for (Direction dir : Direction.values()) {
            turnOff(dir);
        }
    }

    void keyPressed(char key) {
        switch (key) {
            case 'd':
                turnOn(Direction.RIGHT);
                break;
            case 'w':
                turnOn(Direction.UP);
                break;
            case 's':
                turnOn(Direction.DOWN);
                break;
            case 'a':
                turnOn(Direction.LEFT);
                break;
        }
    }

    void keyReleased(char key) {
        switch (key) {
            case 'd':
                turnOff(Direction.RIGHT);
                break;
            case 'w':
                turnOff(Direction.UP);
                break;
            case 's':
                turnOff(Direction.DOWN);
                break;
            case 'a':
                turnOff(Direction.LEFT);
                break;
        }
    }

    enum Direction {
        LEFT  (0, 10),
        RIGHT (1, 5),
        UP (2, 6),
        DOWN (3, 9);

        final int index, pin;
        Direction(int index, int pin) {
            this.index = index;
            this.pin = pin;
        }
    }
}