feat: Terminal rendering

Now finally we can render cube on a screen with up arrow

src/main/java/cz/jzitnik/Cli.java

@@ -6,12 +6,12 @@ import com.googlecode.lanterna.terminal.DefaultTerminalFactory;
 import com.googlecode.lanterna.terminal.MouseCaptureMode;
 import cz.jzitnik.annotations.Dependency;
 import cz.jzitnik.annotations.injectors.InjectDependency;
+import cz.jzitnik.annotations.injectors.InjectState;
 import cz.jzitnik.events.KeyboardPressEvent;
 import cz.jzitnik.events.MouseAction;
-import cz.jzitnik.events.RerenderScreen;
 import cz.jzitnik.events.TerminalResizeEvent;
 import cz.jzitnik.states.RunningState;
-import cz.jzitnik.utils.StateManager;
+import cz.jzitnik.states.TerminalState;
 import cz.jzitnik.utils.events.EventManager;
 import lombok.extern.slf4j.Slf4j;
 
@@ -23,8 +23,11 @@ public class Cli implements Runnable {
     @InjectDependency
     private EventManager eventManager;
 
-    @InjectDependency
+    @InjectState
-    private StateManager stateManager;
+    private TerminalState terminalState;
+
+    @InjectState
+    private RunningState runningState;
 
     @Override
     public void run() {
@@ -33,15 +36,21 @@ public class Cli implements Runnable {
         try (TerminalScreen terminal = new DefaultTerminalFactory()
                 .setMouseCaptureMode(MouseCaptureMode.CLICK_RELEASE_DRAG_MOVE)
                 .createScreen()) {
-            stateManager.registerManually(terminal);
+            terminalState.setTerminalScreen(terminal);
+            terminalState.setTextGraphics(terminal.newTextGraphics());
 
             terminal.setCursorPosition(null);
             terminal.doResizeIfNecessary();
-            terminal.getTerminal().enterPrivateMode();
 
-            terminal.getTerminal().addResizeListener((_, terminalSize) -> eventManager.emitEvent(new TerminalResizeEvent(terminalSize)));
+            terminal.getTerminal().addResizeListener((_, terminalSize) -> {
+                terminal.doResizeIfNecessary();
+                eventManager.emitEvent(new TerminalResizeEvent(terminalSize));
+            });
+
+            terminal.startScreen();
+
+            eventManager.emitEvent(new TerminalResizeEvent(terminal.getTerminalSize()));
 
-            RunningState runningState = stateManager.getOrThrow(RunningState.class);
             while (runningState.isRunning()) {
                 KeyStroke keyStroke = terminal.readInput();
                 if (keyStroke != null) {
@@ -53,8 +62,6 @@ public class Cli implements Runnable {
                     eventManager.emitEvent(new KeyboardPressEvent(keyStroke));
                 }
             }
-
-            eventManager.emitEvent(RerenderScreen.full(terminal.getTerminalSize()));
         } catch (IOException e) {
             log.error("Terminal error occurred, shutting down CLI thread.", e);
             throw new RuntimeException(e);

src/main/java/cz/jzitnik/events/RerenderScreen.java

@@ -1,5 +1,6 @@
 package cz.jzitnik.events;
 
+import com.googlecode.lanterna.TerminalPosition;
 import com.googlecode.lanterna.TerminalSize;
 import cz.jzitnik.utils.events.Event;
 import lombok.AllArgsConstructor;
@@ -8,12 +9,16 @@ import lombok.Data;
 import java.awt.*;
 
 public record RerenderScreen(ScreenPart[] parts) implements Event {
+    public RerenderScreen(ScreenPart part) {
+        this(new ScreenPart[] { part });
+    }
+
     public static RerenderScreen full(TerminalSize terminalSize) {
         return new RerenderScreen(
                 new ScreenPart[]{
                         new ScreenPart(
-                                new Point(0, 0),
+                                new TerminalPosition(0, 0),
-                                new Point(terminalSize.getRows() - 1, terminalSize.getColumns() - 1)
+                                new TerminalPosition(terminalSize.getColumns() - 1, terminalSize.getRows() - 1)
                         )
                 }
         );
@@ -22,7 +27,7 @@ public record RerenderScreen(ScreenPart[] parts) implements Event {
     @Data
     @AllArgsConstructor
     public static class ScreenPart {
-        private Point start;
+        private TerminalPosition start;
-        private Point end;
+        private TerminalPosition end;
     }
 }

src/main/java/cz/jzitnik/events/handlers/CliHandler.java

@@ -2,22 +2,25 @@ package cz.jzitnik.events.handlers;
 
 import com.googlecode.lanterna.TextCharacter;
 import com.googlecode.lanterna.TextColor;
-import com.googlecode.lanterna.screen.TerminalScreen;
+import com.googlecode.lanterna.graphics.TextGraphics;
+import com.googlecode.lanterna.screen.Screen;
 import cz.jzitnik.annotations.EventHandler;
 import cz.jzitnik.annotations.injectors.InjectState;
 import cz.jzitnik.events.RerenderScreen;
 import cz.jzitnik.states.ScreenBuffer;
+import cz.jzitnik.states.TerminalState;
 import cz.jzitnik.ui.pixels.Empty;
 import cz.jzitnik.ui.pixels.Pixel;
 import cz.jzitnik.utils.DependencyManager;
 import cz.jzitnik.utils.events.AbstractEventHandler;
 
 import java.awt.*;
+import java.io.IOException;
 
 @EventHandler(RerenderScreen.class)
 public class CliHandler extends AbstractEventHandler<RerenderScreen> {
     @InjectState
-    private TerminalScreen terminalScreen;
+    private TerminalState terminalState;
 
     @InjectState
     private ScreenBuffer screenBuffer;
@@ -30,25 +33,32 @@ public class CliHandler extends AbstractEventHandler<RerenderScreen> {
     public void handle(RerenderScreen event) {
         var parts = event.parts();
         var buffer = screenBuffer.getBuffer();
+        var terminalScreen = terminalState.getTerminalScreen();
+        var tg = terminalState.getTextGraphics();
 
         for (RerenderScreen.ScreenPart part : parts) {
-            Point a = part.getStart();
+            var start = part.getStart();
-            Point b = part.getEnd();
+            var end = part.getEnd();
 
-            for (double y = a.getY(); y < b.getY(); y++) {
+            for (int y = start.getRow(); y <= end.getRow(); y++) {
-                for (double x = a.getX(); x < b.getX(); x++) {
+                for (int x = start.getColumn(); x <= end.getColumn(); x++) {
-                    Pixel pixel = buffer[(int) y][(int) x];
+                    Pixel pixel = buffer[y][x];
-                    terminalScreen.setCharacter(
+                    TextColor color = pixel.getClass().equals(Empty.class) ? TextColor.ANSI.BLACK : pixel.getColor();
-                            (int) x,
+
-                            (int) y,
+                    drawPixel(tg, x, y, color);
-                            new TextCharacter(
-                                    ' ',
-                                    TextColor.ANSI.DEFAULT,
-                                    pixel.getClass().equals(Empty.class) ? TextColor.ANSI.DEFAULT : pixel.getColor()
-                            )
-                    );
                 }
             }
         }
+
+        try {
+            terminalScreen.refresh();
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    private static void drawPixel(TextGraphics tg, int x, int y, TextColor color) {
+        tg.setForegroundColor(color);
+        tg.setCharacter(x, y, '█'); // full block character
     }
 }

src/main/java/cz/jzitnik/events/handlers/ExitEventHandler.java

@@ -18,5 +18,6 @@ public class ExitEventHandler extends AbstractEventHandler<ExitEvent> {
         StateManager stateManager = dm.getDependencyOrThrow(StateManager.class);
         RunningState runningState = stateManager.getOrThrow(RunningState.class);
         runningState.setRunning(false);
+        System.exit(0); // Pls don't blame me
     }
 }

src/main/java/cz/jzitnik/events/handlers/KeyboardPressEventHandler.java

@@ -1,9 +1,16 @@
 package cz.jzitnik.events.handlers;
 
+import com.googlecode.lanterna.TerminalPosition;
+import com.googlecode.lanterna.TextColor;
 import com.googlecode.lanterna.input.KeyStroke;
 import cz.jzitnik.annotations.EventHandler;
+import cz.jzitnik.annotations.injectors.InjectState;
 import cz.jzitnik.events.ExitEvent;
 import cz.jzitnik.events.KeyboardPressEvent;
+import cz.jzitnik.events.RerenderScreen;
+import cz.jzitnik.states.ScreenBuffer;
+import cz.jzitnik.ui.pixels.ColoredPixel;
+import cz.jzitnik.ui.pixels.Pixel;
 import cz.jzitnik.utils.DependencyManager;
 import cz.jzitnik.utils.events.AbstractEventHandler;
 import cz.jzitnik.utils.events.EventManager;
@@ -14,13 +21,29 @@ public class KeyboardPressEventHandler extends AbstractEventHandler<KeyboardPres
         super(dm);
     }
 
+    @InjectState
+    private ScreenBuffer screenBuffer;
+
     @Override
     public void handle(KeyboardPressEvent event) {
         EventManager eventManager = dm.getDependencyOrThrow(EventManager.class);
 
         KeyStroke keyStroke = event.getKeyStroke();
+        Pixel[][] buffer = screenBuffer.getBuffer();
 
         switch (keyStroke.getKeyType()) {
+            case ArrowUp:
+                var start = new TerminalPosition(0, 0);
+                var end = new TerminalPosition(20, 10);
+                for (int y = start.getRow(); y < end.getRow(); y++) {
+                    for (int x = start.getColumn(); x < end.getColumn(); x++) {
+                        buffer[y][x] = new ColoredPixel(TextColor.ANSI.CYAN);
+                    }
+                }
+
+                eventManager.emitEvent(new RerenderScreen(new RerenderScreen.ScreenPart(start, end)));
+
+                break;
             case Escape:
                 eventManager.emitEvent(new ExitEvent());
                 break;

src/main/java/cz/jzitnik/events/handlers/TerminalResizeEventHandler.java

@@ -1,9 +1,17 @@
 package cz.jzitnik.events.handlers;
 
+import com.googlecode.lanterna.TerminalSize;
 import cz.jzitnik.annotations.EventHandler;
+import cz.jzitnik.annotations.injectors.InjectDependency;
+import cz.jzitnik.annotations.injectors.InjectState;
+import cz.jzitnik.events.RerenderScreen;
 import cz.jzitnik.events.TerminalResizeEvent;
+import cz.jzitnik.states.ScreenBuffer;
+import cz.jzitnik.ui.pixels.Empty;
+import cz.jzitnik.ui.pixels.Pixel;
 import cz.jzitnik.utils.DependencyManager;
 import cz.jzitnik.utils.events.AbstractEventHandler;
+import cz.jzitnik.utils.events.EventManager;
 
 @EventHandler(TerminalResizeEvent.class)
 public class TerminalResizeEventHandler extends AbstractEventHandler<TerminalResizeEvent> {
@@ -11,8 +19,26 @@ public class TerminalResizeEventHandler extends AbstractEventHandler<TerminalRes
         super(dm);
     }
 
+    @InjectDependency
+    private EventManager eventManager;
+
+    @InjectState
+    private ScreenBuffer screenBuffer;
+
     @Override
     public void handle(TerminalResizeEvent event) {
-        System.out.println("NEWSIZE: " + event.getNewSize());
+        TerminalSize size = event.getNewSize();
+        int width = size.getColumns();
+        int height = size.getRows();
+
+        Pixel[][] buffer = new Pixel[height][width];
+        for (int x = 0; x < width; x++) {
+            for (int y = 0; y < height; y++) {
+                buffer[y][x] = new Empty();
+            }
+        }
+        screenBuffer.setBuffer(buffer);
+
+        eventManager.emitEvent(RerenderScreen.full(size));
     }
 }

src/main/java/cz/jzitnik/states/ScreenBuffer.java

@@ -7,5 +7,5 @@ import lombok.Data;
 @Data
 @State
 public class ScreenBuffer {
-    private Pixel[][] buffer;
+    private Pixel[][] buffer = new Pixel[][] {};
 }

src/main/java/cz/jzitnik/states/TerminalState.java

@@ -0,0 +1,13 @@
+package cz.jzitnik.states;
+
+import com.googlecode.lanterna.graphics.TextGraphics;
+import com.googlecode.lanterna.screen.TerminalScreen;
+import cz.jzitnik.annotations.State;
+import lombok.Data;
+
+@State
+@Data
+public class TerminalState {
+    private TerminalScreen terminalScreen;
+    private TextGraphics textGraphics;
+}

src/main/java/cz/jzitnik/utils/DependencyManager.java

@@ -8,6 +8,7 @@ import cz.jzitnik.annotations.Dependency;
 import cz.jzitnik.annotations.injectors.InjectConfig;
 import cz.jzitnik.annotations.injectors.InjectDependency;
 import cz.jzitnik.annotations.injectors.InjectState;
+import cz.jzitnik.events.handlers.CliHandler;
 import lombok.extern.slf4j.Slf4j;
 import org.reflections.Reflections;
 
@@ -96,8 +97,14 @@ public class DependencyManager {
             }
         }
 
+        for (Object instance : data.values()) {
+            inject(instance);
+        }
+
+    }
+
+    public void inject(Object instance) {
         StateManager stateManager = (StateManager) data.get(StateManager.class);
-        for (Object instance: data.values()) {
         Class<?> clazz = instance.getClass();
 
         for (Field field : clazz.getDeclaredFields()) {
@@ -141,5 +148,4 @@ public class DependencyManager {
             }
         }
     }
-    }
 }

src/main/java/cz/jzitnik/utils/events/EventManager.java

@@ -26,6 +26,7 @@ public class EventManager extends Thread {
     private ExecutorService eventExecutor;
     private final HashMap<Class<? extends Event>, AbstractEventHandler<? extends Event>> handlers = new HashMap<>();
     private final BlockingQueue<Event> eventQueue = new LinkedBlockingQueue<>();
+    private final DependencyManager dependencyManager;
 
     @SuppressWarnings("unchecked")
     private <T extends Event> AbstractEventHandler<T> getHandler(Class<T> type) {
@@ -38,6 +39,7 @@ public class EventManager extends Thread {
 
     @SuppressWarnings("unchecked")
     public EventManager(Reflections reflections, DependencyManager dependencyManager) {
+        this.dependencyManager = dependencyManager;
         setDaemon(true);
 
         var classes = reflections.getTypesAnnotatedWith(EventHandler.class);
@@ -56,6 +58,10 @@ public class EventManager extends Thread {
 
     @Override
     public void run() {
+        for (Object instance : handlers.values()) {
+            dependencyManager.inject(instance);
+        }
+
         eventExecutor = Executors.newFixedThreadPool(eventThreadPoolConfig.getThreadCount());
         while (runningState.isRunning()) {
             try {
@@ -76,7 +82,13 @@ public class EventManager extends Thread {
         AbstractEventHandler<T> handler = getHandler((Class<T>) event.getClass());
 
         if (handler != null) {
-            eventExecutor.submit(() -> handler.handle(typedEvent));
+            eventExecutor.submit(() -> {
+                try {
+                    handler.handle(typedEvent);
+                } catch (Exception e) {
+                    e.printStackTrace(System.err);
+                }
+            });
         }
     }
 }