LedStrip.java

import processing.core.PApplet;
import processing.event.MouseEvent;
import processing.serial.Serial;

/**
 * @author LatvianModder
 */
public class LedStrip extends PApplet
{
	public static void main(String[] args)
	{
		PApplet.main("LedStrip");
	}

	public Thread serialWriter;
	public byte[] ledData = null;

	@Override
	public void settings()
	{
		size(600, 150);
	}

	@Override
	public void setup()
	{
		serialWriter = new Thread(() -> {
			try
			{
				Serial serial = null;

				for (String s : Serial.list())
				{
					if (!s.equals("COM1"))
					{
						serial = new Serial(LedStrip.this, s, 1000000);
						ledData = new byte[1 + 3 * 300];
						setBrightness(30);
						println("Opened Serial at port " + s);
						break;
					}
				}

				if (serial == null)
				{
					println("Serial port not found!");
					exit();
					return;
				}

				while (serial.readBytes() == null)
				{
					Thread.sleep(1L);
				}

				while (serialWriter != null)
				{
					if (ledData != null)
					{
						serial.write(ledData);

						while (serial.readBytes() == null)
						{
							Thread.sleep(1L);
						}
					}
				}
			}
			catch (Exception ex)
			{
				ex.printStackTrace();
				exit();
			}
		});

		serialWriter.start();
	}

	public int getBrightness()
	{
		return ledData[0] & 0xFF;
	}

	public void setBrightness(int brightness)
	{
		ledData[0] = (byte) min(max(brightness, 0), 120);
	}

	public void setLed(int index, int red, int green, int blue)
	{
		if (index < 0 || index > (ledData.length - 1) / 3)
		{
			return;
		}

		ledData[index * 3 + 1] = (byte) red;
		ledData[index * 3 + 2] = (byte) green;
		ledData[index * 3 + 3] = (byte) blue;
	}

	public void setLed(int index, int color)
	{
		setLed(index, color >> 16, color >> 8, color);
	}

	@Override
	public void dispose()
	{
		super.dispose();
		serialWriter = null;
	}

	@Override
	public void draw()
	{
		background(0);
		noStroke();

		if (ledData == null)
		{
			return;
		}

		int leds = (ledData.length - 1) / 3;
		float seconds = millis() * 0.001F;

		int mode = (int) (seconds / 5F) % 2;

		if (mode == 0)
		{
			for (int i = 0; i < leds; i++)
			{
				setLed(i, java.awt.Color.HSBtoRGB(i / 20F + seconds, 1F /*map(sin(seconds * 3F), -1F, 1F, 0.1F, 1F)*/, 1F));
			}
		}
		else if (mode == 1)
		{
			for (int i = 0; i < leds; i++)
			{
				setLed(i, (int) map(sin(seconds * 3F + i * 0.3F), -1F, 1F, 0, 90), 0, 0);
			}
		}

		for (int i = 0; i < leds; i++)
		{
			fill(ledData[i * 3 + 1] & 0xFF, ledData[i * 3 + 2] & 0xFF, ledData[i * 3 + 3] & 0xFF);
			rect(i * 2, 0, 2, height);
		}
	}

	@Override
	public void mouseWheel(MouseEvent event)
	{
		setBrightness(getBrightness() - event.getCount() * 10);
	}
}