LEDControl/src/main/java/de/zuim/ledcontrol/LEDControl.java

package de.zuim.ledcontrol;

import com.fazecast.jSerialComm.SerialPort;
import com.fazecast.jSerialComm.SerialPortDataListener;
import com.fazecast.jSerialComm.SerialPortEvent;

import java.awt.*;
import java.awt.geom.AffineTransform;
import java.awt.image.AffineTransformOp;
import java.awt.image.BufferedImage;
import java.nio.charset.StandardCharsets;

public class LEDControl {
	public static final int WIDTH = 32;
	public static final int HEIGHT = 16;
	public static final int LED_NUM = WIDTH * HEIGHT;
	public static final int BAUD = 1000000;
	private static final int FRAME_MS = 40;


	private SerialPort port;
	private final byte[][][] leds = new byte[WIDTH][HEIGHT][3];
	private final EffectManager eff;
	private BufferedImage scaledImage;

	public LEDControl() {
		eff = new EffectManager();

		Runtime.getRuntime().addShutdownHook(new Thread(() -> port.closePort()));

		connect();

		sendLoop();
	}

	private void sendLoop() {
		long time = System.nanoTime();
		long iteration = 0;

		long minTimeDelta = Long.MAX_VALUE,
				maxTimeDelta = 0,
				avgTimeDelta = 0;

		while (true) {
			if (port == null || !port.isOpen()) {
				if (!connect()) {
					sleep(1000);
					continue;
				}
			}

			long timeDelta = System.nanoTime() - time;
			if (timeDelta > maxTimeDelta)
				maxTimeDelta = timeDelta;
			if (timeDelta < minTimeDelta)
				minTimeDelta = timeDelta;
			avgTimeDelta += timeDelta;
			time = System.nanoTime();

			renderFrame(timeDelta);

			port.writeBytes(new byte[]{(byte) 255}, 1); //start of new frame

			for (int x = 0; x < WIDTH; x++) {
				for (int y = 0; y < HEIGHT; y++) {
					int col = scaledImage.getRGB(x, (x % 2 == 1) ? leds[0].length - y - 1 : y);
					leds[x][y][0] = (byte) Math.min(((col >> 16) & 0xff), 254);
					leds[x][y][1] = (byte) Math.min((col >> 8) & 0xff, 254);
					leds[x][y][2] = (byte) Math.min(((col) & 0xff), 254);
					port.writeBytes(leds[x][y], 3);
				}
			}

			sleep(FRAME_MS);//(int) (FRAME_MS) - ((System.nanoTime()-time)/1000000)));

			if (iteration % 1000 == 0 && iteration > 0) {
				System.out.println("Frametime: " + (Math.round(avgTimeDelta / 1000.0) / 100000) / 10.0 + "ms (" + (Math.round(minTimeDelta) / 100000) / 10.0 + "ms - " + (Math.round(maxTimeDelta) / 100000) / 10.0 + "ms) " + iteration + " Frames");
				minTimeDelta = Long.MAX_VALUE;
				maxTimeDelta = 0;
				avgTimeDelta = 0;
			}
			iteration++;
		}
	}

	private boolean connect() {
		SerialPort[] ports = SerialPort.getCommPorts();
		if (ports.length > 0) {
			port = SerialPort.getCommPorts()[0];
			System.out.println("Connect to " + port.getDescriptivePortName() + " " + port.getSystemPortName() + " ");
			port.setComPortParameters(BAUD, 8, 1, 0);
			if (port.openPort()) {
				port.addDataListener(new SerialPortDataListener() {
					@Override
					public int getListeningEvents() {
						return SerialPort.LISTENING_EVENT_DATA_RECEIVED;
					}

					@Override
					public void serialEvent(SerialPortEvent event) {
						System.err.println("Received: " + new String(event.getReceivedData(), StandardCharsets.US_ASCII));
					}
				});
				return true;
			}
		}

		return false;
	}

	private void sleep(int ms) {
		try {
			Thread.sleep(ms);
		} catch (InterruptedException e) {
			e.printStackTrace();
		}
	}

	private void renderFrame(long timeDelta) {
		BufferedImage image = new BufferedImage(WIDTH * eff.getActiveEffect().getScale(), HEIGHT * eff.getActiveEffect().getScale(), BufferedImage.TYPE_INT_ARGB);
		Graphics g = image.getGraphics();
		eff.getActiveEffect().render(timeDelta, g);
		g.dispose();

		if (eff.getActiveEffect().getScale() == 1) {
			scaledImage = image;
		} else {
			scaledImage = new BufferedImage(WIDTH, HEIGHT, BufferedImage.TYPE_INT_ARGB);
			AffineTransform at = new AffineTransform();
			at.scale(1.0 / eff.getActiveEffect().getScale(), 1.0 / eff.getActiveEffect().getScale());
			AffineTransformOp scaleOp =
					new AffineTransformOp(at, AffineTransformOp.TYPE_BILINEAR);
			scaledImage = scaleOp.filter(image, scaledImage);
		}
	}

	public static void main(String[] args) {
		new LEDControl();
	}
}