Refactor GraphicsContext: implement translation handling and update drawing methods to use translation values

.run/Bootloader.run.xml

@@ -0,0 +1,15 @@
+<component name="ProjectRunConfigurationManager">
+  <configuration default="false" name="Bootloader" type="Application" factoryName="Application" nameIsGenerated="true">
+    <option name="MAIN_CLASS_NAME" value="be.seeseemelk.diceos.Bootloader" />
+    <module name="diceos.main" />
+    <extension name="coverage">
+      <pattern>
+        <option name="PATTERN" value="be.seeseemelk.diceos.*" />
+        <option name="ENABLED" value="true" />
+      </pattern>
+    </extension>
+    <method v="2">
+      <option name="Make" enabled="true" />
+    </method>
+  </configuration>
+</component>

build.gradle.kts

@@ -12,6 +12,10 @@ val slf4j = "2.0.18"
 val lombokVersion = "1.18.46"
 val avajeInjectVersion = "12.5"
 
+application {
+    mainClass = "be.seeseemelk.diceos.Bootloader"
+}
+
 repositories {
     mavenCentral()
 }

src/main/java/be/seeseemelk/diceos/system/DiceOS.java

@@ -10,6 +10,7 @@ public class DiceOS {
     private static DiceOS INSTANCE;
     private final ResourceLoader resourceLoader;
     private final WindowService windowService;
+    private final InputService inputService;
 
     @PostConstruct
     void register() {
@@ -33,4 +34,8 @@ public class DiceOS {
     public static WindowService getWindowService() {
         return INSTANCE.windowService;
     }
+
+    public static InputService getInputService() {
+        return INSTANCE.inputService;
+    }
 }

src/main/java/be/seeseemelk/diceos/system/DiceOSAdapter.java

@@ -5,7 +5,6 @@ import com.badlogic.gdx.ApplicationAdapter;
 import com.badlogic.gdx.Gdx;
 import com.badlogic.gdx.graphics.Color;
 import com.badlogic.gdx.graphics.Texture;
-import com.badlogic.gdx.graphics.g2d.BitmapFont;
 import com.badlogic.gdx.graphics.g2d.TextureRegion;
 import com.badlogic.gdx.utils.ScreenUtils;
 import com.badlogic.gdx.utils.viewport.ScreenViewport;
@@ -24,6 +23,7 @@ public class DiceOSAdapter extends ApplicationAdapter {
     private final DisplayService display;
     private final CursorService cursorService;
     private final WindowService windowService;
+    private final InputService inputService;
     private final List<OnStartup> startupTasks;
     private Texture clouds;
     private Texture border;
@@ -62,6 +62,8 @@ public class DiceOSAdapter extends ApplicationAdapter {
         offsetY = (height - (displayHeight * scaling)) / 2;
 
         cursorService.setScale(scaling);
+        inputService.setScale(scaling);
+        inputService.setOffset(offsetX, offsetY);
 
         gc = new GraphicsContext(screenViewport.getCamera(), display.getBatch(), displayHeight, displayWidth,
                 DiceOS.getResourceLoader().getDefaultFont().getBitmapFont());

src/main/java/be/seeseemelk/diceos/system/InputService.java

@@ -8,13 +8,14 @@ import io.avaje.inject.Component;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
 
-import java.awt.event.KeyEvent;
-
 @Slf4j
 @Component
 @RequiredArgsConstructor
 public class InputService implements OnStartup {
     private final DisplayService displayService;
+    private int scale = 1;
+    private int offsetX = 0;
+    private int offsetY = 0;
 
     @Override
     public void onStartup() {
@@ -49,4 +50,36 @@ public class InputService implements OnStartup {
         return Gdx.input.isKeyPressed(com.badlogic.gdx.Input.Keys.ALT_LEFT) ||
                Gdx.input.isKeyPressed(com.badlogic.gdx.Input.Keys.ALT_RIGHT);
     }
+
+    public int getMouseX() {
+        return (Gdx.input.getX() - offsetX) / scale;
+    }
+
+    public int getMouseY() {
+        return (Gdx.input.getY() - offsetY) / scale;
+    }
+
+    void setScale(int scale) {
+        this.scale = scale;
+    }
+
+    void setOffset(int x, int y) {
+        this.offsetX = x;
+        this.offsetY = y;
+    }
+
+    /**
+     * Checks if the mouse is currently within the specified rectangle.
+     * @param x The x-coordinate of the rectangle.
+     * @param y The y-coordinate of the rectangle.
+     * @param width The width of the rectangle.
+     * @param height The height of the rectangle.
+     * @return True if the mouse is within the rectangle, false otherwise.
+     */
+    public boolean mouseInBounds(int x, int y, int width, int height) {
+        int mx = getMouseX();
+        int my = getMouseY();
+        return mx >= x && mx < x + width &&
+               my >= y && my < y + height;
+    }
 }

src/main/java/be/seeseemelk/diceos/system/WindowService.java

@@ -69,9 +69,12 @@ public class WindowService implements OnStartup {
 
         // Render menubar items
         gc.save();
-        gc.translate(10, 0);
+        gc.translate(5, 0);
         for (var submenu : menu.getItems()) {
+            gc.save();
+            gc.clip(0, 0, submenu.getWidth(), submenu.getHeight());
             submenu.paint(gc);
+            gc.restore();
             gc.translate(submenu.getWidth() + 4, 0);
         }
         gc.restore();

src/main/java/be/seeseemelk/diceos/system/gfx/GraphicsContext.java

@@ -11,6 +11,8 @@ import com.badlogic.gdx.scenes.scene2d.utils.ScissorStack;
 import lombok.Getter;
 import lombok.RequiredArgsConstructor;
 
+import java.util.Stack;
+
 /**
  * Graphics context and rendering utilities.
  */
@@ -23,15 +25,20 @@ public class GraphicsContext {
     private final int width;
     private final BitmapFont font;
 
-    private final java.util.Stack<GraphicsState> stateStack = new java.util.Stack<>();
+    private final Stack<GraphicsState> stateStack = new java.util.Stack<>();
+
+    private int translateX = 0;
+    private int translateY = 0;
 
     private static class GraphicsState {
-        private final com.badlogic.gdx.math.Matrix4 transform;
+        private final int translateX;
-        private final boolean scissorEnabled;
+        private final int translateY;
+        private int scissorCount;
 
-        public GraphicsState(com.badlogic.gdx.math.Matrix4 transform, boolean scissorEnabled) {
+        public GraphicsState(int translateX, int translateY, int scissorCount) {
-            this.transform = transform.cpy();
+            this.translateX = translateX;
-            this.scissorEnabled = scissorEnabled;
+            this.translateY = translateY;
+            this.scissorCount = scissorCount;
         }
     }
 
@@ -44,7 +51,7 @@ public class GraphicsContext {
      * @param height The height.
      */
     public void draw(NinePatch image, int x, int y, int width, int height) {
-        image.draw(batch, x, getHeight() - height - y, width, height);
+        image.draw(batch, x + translateX, getHeight() - height - (y + translateY), width, height);
     }
 
     /**
@@ -54,7 +61,7 @@ public class GraphicsContext {
      * @param y The y-coordinate.
      */
     public void draw(Texture texture, int x, int y) {
-        draw(texture, x, y, Parameters.DEFAULT);
+        draw(texture, x + translateX, y + translateY, Parameters.DEFAULT);
     }
 
     /**
@@ -66,7 +73,7 @@ public class GraphicsContext {
      */
     public void draw(Texture texture, int x, int y, Parameters params) {
         batch.draw(texture,
-                x, getHeight() - y - texture.getHeight(), texture.getWidth(), texture.getHeight(),
+                x + translateX, getHeight() - (y + translateY) - texture.getHeight(), texture.getWidth(), texture.getHeight(),
                 0, 0, texture.getWidth(), texture.getHeight(),
                 params.flipX, params.flipY);
     }
@@ -78,7 +85,7 @@ public class GraphicsContext {
      * @param y The y coordinate to draw at.
      */
     public void draw(String text, int x, int y) {
-        font.draw(batch, text, x, getHeight() - (y + font.getLineHeight()));
+        font.draw(batch, text, x + translateX, getHeight() - (y + translateY + font.getLineHeight()));
     }
 
     /**
@@ -90,7 +97,7 @@ public class GraphicsContext {
      */
     public void fillRect(int x, int y, int width, int height) {
         var texture = DiceOS.getResourceLoader().loadTexture("system/white.png");
-        batch.draw(texture, x, getHeight() - height - y, width, height); // This is not ideal.
+        batch.draw(texture, x + translateX, getHeight() - height - (y + translateY), width, height);
     }
 
     /**
@@ -111,7 +118,21 @@ public class GraphicsContext {
      * @param y The number of pixels to move down by.
      */
     public void translate(int x, int y) {
-        batch.setTransformMatrix(batch.getTransformMatrix().trn(x, -y, 0));
+        translateX += x;
+        translateY += y;
+    }
+
+    /**
+     * Gets the total amount of X-translation applied by this graphics context.
+     * In other words, a draw command with `x=0` would actually write to this screen coordinate.
+     * @return The total amount of X-translation.
+     */
+    public int getXTranslation() {
+        return translateX;
+    }
+
+    public int getYTranslation() {
+        return translateY;
     }
 
     /**
@@ -121,10 +142,32 @@ public class GraphicsContext {
      * @param height The height of the clipping area.
      */
     public void clip(int width, int height) {
-        var scissors = new Rectangle(0, 0, width, height);
+        clip(0, 0, width, height);
+    }
+
+    /**
+     * Sets a clipping rectangle for subsequent draw operations.
+     *
+     * @param x      The x-coordinate of the clipping area.
+     * @param y      The y-coordinate of the clipping area.
+     * @param width  The width of the clipping area.
+     * @param height The height of the clipping area.
+     */
+    public void clip(int x, int y, int width, int height) {
+        var scissors = new Rectangle(x, getHeight() - y - height, width - getXTranslation(), height - getYTranslation());
         ScissorStack.calculateScissors(camera, batch.getTransformMatrix(), scissors, scissors);
         batch.flush();
-        ScissorStack.pushScissors(scissors);
+        if (ScissorStack.pushScissors(scissors)) {
+            getCurrentState().scissorCount++;
+        }
+    }
+
+    /**
+     * Returns the current graphics state from the top of the stack.
+     * @return The current state.
+     */
+    private GraphicsState getCurrentState() {
+        return stateStack.peek();
     }
 
     /**
@@ -132,7 +175,7 @@ public class GraphicsContext {
      * The state can later be restored using {@link #restore()}.
      */
     public void save() {
-        stateStack.push(new GraphicsState(batch.getTransformMatrix(), false));
+        stateStack.push(new GraphicsState(translateX, translateY, 0));
     }
 
     /**
@@ -145,7 +188,11 @@ public class GraphicsContext {
         }
         batch.flush();
         GraphicsState state = stateStack.pop();
-        batch.setTransformMatrix(state.transform);
+        translateX = state.translateX;
+        translateY = state.translateY;
+        for (int i = 0; i < state.scissorCount; i++) {
+            ScissorStack.popScissors();
+        }
     }
 
     /**

src/main/java/be/seeseemelk/diceos/system/toolkit/menu/Menu.java

@@ -5,12 +5,14 @@ import be.seeseemelk.diceos.system.font.Font;
 import be.seeseemelk.diceos.system.gfx.GraphicsContext;
 import lombok.Getter;
 import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
 
 import java.util.ArrayList;
 import java.util.List;
 
 @RequiredArgsConstructor
 @Getter
+@Slf4j
 public class Menu implements MenuItem {
     private final String title;
     private final List<MenuItem> items = new ArrayList<>();
@@ -33,7 +35,7 @@ public class Menu implements MenuItem {
 
     @Override
     public int getHeight() {
-        return items.stream().mapToInt(MenuItem::getHeight).sum();
+        return 13;
     }
 
     /**
@@ -49,7 +51,15 @@ public class Menu implements MenuItem {
 
     @Override
     public void paint(GraphicsContext gc) {
+        if (DiceOS.getInputService().mouseInBounds(gc.getXTranslation(), gc.getYTranslation(), getWidth(), getHeight())) {
+            log.info("Mouse in bounds");
+            gc.setColour(0, 0, 255);
+        }
+
+        gc.fillRect(-100, -100, 500, 500);
+        gc.setColour(255, 255, 255);
+
         // Renders the menu as a simple menu button
-        gc.draw(title, 0, 5);
+        gc.draw(title, 2, 5);
     }
 }

src/main/java/be/seeseemelk/diceos/system/utils/Utils.java

@@ -12,4 +12,18 @@ public class Utils {
     public static boolean isPowerOfTwo(int value) {
         return (value & (value - 1)) == 0 && value != 0;
     }
+
+    /**
+     * Determines if the point at (x, y) is inside the bounds of (x1, y1, width, height).
+     * @param x The x-coordinate of the point.
+     * @param y The y-coordinate of the point.
+     * @param x1 The x-coordinate of the bounds.
+     * @param y1 The y-coordinate of the bounds.
+     * @param width The width of the bounds.
+     * @param height The height of the bounds.
+     * @return True if the point is inside the bounds, false otherwise.
+     */
+    public static boolean isInBounds(int x, int y, int x1, int y1, int width, int height) {
+        return x >= x1 && x < x1 + width && y >= y1 && y < y1 + height;
+    }
 }

src/test/java/be/seeseemelk/diceos/system/InputServiceTest.java

@@ -0,0 +1,39 @@
+package be.seeseemelk.diceos.system;
+
+import com.badlogic.gdx.Gdx;
+import com.badlogic.gdx.Input;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.mockito.Mockito;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class InputServiceTest {
+    private DisplayService displayService;
+    private InputService inputService;
+
+    @BeforeEach
+    void setUp() {
+        displayService = Mockito.mock(DisplayService.class);
+        inputService = new InputService(displayService);
+        Gdx.input = Mockito.mock(Input.class);
+    }
+
+    @Test
+    void testMouseMethods() {
+        Mockito.when(Gdx.input.getX()).thenReturn(100);
+        Mockito.when(Gdx.input.getY()).thenReturn(200);
+
+        assertEquals(100, inputService.getMouseX());
+        assertEquals(200, inputService.getMouseY());
+    }
+
+    @Test
+    void testMouseInBounds() {
+        Mockito.when(Gdx.input.getX()).thenReturn(100);
+        Mockito.when(Gdx.input.getY()).thenReturn(200);
+
+        assertTrue(inputService.mouseInBounds(90, 190, 20, 20));
+        assertFalse(inputService.mouseInBounds(0, 0, 50, 50));
+    }
+}

src/test/java/be/seeseemelk/diceos/system/gfx/GraphicsContextTest.java

@@ -0,0 +1,73 @@
+package be.seeseemelk.diceos.system.gfx;
+
+import com.badlogic.gdx.graphics.Camera;
+import com.badlogic.gdx.graphics.Texture;
+import com.badlogic.gdx.graphics.g2d.Batch;
+import com.badlogic.gdx.graphics.g2d.BitmapFont;
+import com.badlogic.gdx.graphics.g2d.NinePatch;
+import com.badlogic.gdx.math.Matrix4;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.mockito.Mockito.*;
+
+class GraphicsContextTest {
+    private Camera camera;
+    private Batch batch;
+    private BitmapFont font;
+    private GraphicsContext gc;
+
+    @BeforeEach
+    void setUp() {
+        camera = mock(Camera.class);
+        batch = mock(Batch.class);
+        font = mock(BitmapFont.class);
+        gc = new GraphicsContext(camera, batch, 600, 800, font);
+        when(batch.getTransformMatrix()).thenReturn(new Matrix4());
+    }
+
+    @Test
+    void testDrawNinePatch() {
+        NinePatch np = mock(NinePatch.class);
+        gc.draw(np, 10, 20, 100, 200);
+        verify(np).draw(eq(batch), eq(10f), eq(380f), eq(100f), eq(200f));
+    }
+
+    @Test
+    void testDrawTexture() {
+        Texture tex = mock(Texture.class);
+        when(tex.getHeight()).thenReturn(50);
+        when(tex.getWidth()).thenReturn(50);
+        gc.draw(tex, 10, 20);
+        verify(batch).draw(eq(tex), eq(10f), anyFloat(), anyFloat(), anyFloat(), anyInt(), anyInt(), anyInt(), anyInt(), anyBoolean(), anyBoolean());
+    }
+
+    @Test
+    void testDrawText() {
+        gc.draw("test", 10, 20);
+        verify(font).draw(batch, "test", 10f, 600f - (20f + font.getLineHeight()));
+    }
+
+    @Test
+    void testSetColour() {
+        gc.setColour(255, 0, 0);
+        verify(batch).setColor(1f, 0f, 0f, 1f);
+    }
+
+    @Test
+    void testTranslate() {
+        gc.translate(10, 20);
+        assertEquals(10, gc.getXTranslation());
+        assertEquals(20, gc.getYTranslation());
+    }
+
+    @Test
+    void testSaveRestore() {
+        gc.save();
+        assertDoesNotThrow(() -> gc.restore());
+        assertThrows(IllegalStateException.class, () -> gc.restore());
+    }
+}