From b4d07b0d999caf7993c06f18b17940a9ea4c96cd Mon Sep 17 00:00:00 2001
From: Maurice <maurice@miaurizius.de>
Date: Mon, 8 Dec 2025 06:18:03 +0100
Subject: [PATCH] automatically switch to fullscreen

---
 src/de/miaurizius/jgame2d/core/Boot.java      |  4 +++-
 src/de/miaurizius/jgame2d/core/GamePanel.java | 10 ++++++++++
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/src/de/miaurizius/jgame2d/core/Boot.java b/src/de/miaurizius/jgame2d/core/Boot.java
index e0b687b..badfc9d 100644
--- a/src/de/miaurizius/jgame2d/core/Boot.java
+++ b/src/de/miaurizius/jgame2d/core/Boot.java
@@ -6,12 +6,14 @@ import java.util.logging.Logger;
 public class Boot {
 
     public static final Logger logger = Logger.getLogger("JDGame2D");
+    public static JFrame window;
 
     static void main() {
-        JFrame window = new JFrame();
+        window = new JFrame();
         window.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
         window.setResizable(false);
         window.setTitle("JGame2D");
+        window.setUndecorated(true);
 
         GamePanel gamePanel = new GamePanel();
         window.add(gamePanel);
diff --git a/src/de/miaurizius/jgame2d/core/GamePanel.java b/src/de/miaurizius/jgame2d/core/GamePanel.java
index aafb5f1..6e0c6fc 100644
--- a/src/de/miaurizius/jgame2d/core/GamePanel.java
+++ b/src/de/miaurizius/jgame2d/core/GamePanel.java
@@ -222,6 +222,16 @@ public class GamePanel extends JPanel implements Runnable {
 
         tempScreen = new BufferedImage(screenWidth, screenHeight, BufferedImage.TYPE_INT_RGB);
         fg2 = (Graphics2D) tempScreen.getGraphics();
+
+        setFullscreen();
+    }
+    public void setFullscreen() {
+        GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
+        GraphicsDevice gd = ge.getDefaultScreenDevice();
+        gd.setFullScreenWindow(Boot.window);
+
+        fScreenWidth = Boot.window.getWidth();
+        fScreenHeight = Boot.window.getHeight();
     }
 
 }