From 1a822434b3b8e18d9fd2a0b1e2ba4c3ab2aa262c Mon Sep 17 00:00:00 2001
From: Maurice <maurice@miaurizius.de>
Date: Wed, 26 Nov 2025 20:46:09 +0100
Subject: [PATCH] added moveable component and limited gameclock to 60fps

---
 src/de/mp/jgame2d/core/GamePanel.java  | 42 ++++++++++++++++++++--
 src/de/mp/jgame2d/core/KeyHandler.java | 50 ++++++++++++++++++++++++++
 2 files changed, 89 insertions(+), 3 deletions(-)
 create mode 100644 src/de/mp/jgame2d/core/KeyHandler.java

diff --git a/src/de/mp/jgame2d/core/GamePanel.java b/src/de/mp/jgame2d/core/GamePanel.java
index 11c2e94..bb2d722 100644
--- a/src/de/mp/jgame2d/core/GamePanel.java
+++ b/src/de/mp/jgame2d/core/GamePanel.java
@@ -16,12 +16,23 @@ public class GamePanel extends JPanel implements Runnable {
     final int screenWidth = tileSize * maxScreenCol; // 768 pixels
     final int screenHeight = tileSize * maxScreenRow; // 576 pixels
 
+    //FPS
+    int FPS = 60;
+
+    KeyHandler keyH = new KeyHandler();
     Thread gameThread;
 
+    //Default position
+    int playerX = 100;
+    int playerY = 100;
+    int playerSpeed = 4;
+
     public GamePanel() {
         this.setPreferredSize(new Dimension(screenWidth, screenHeight));
         this.setBackground(Color.black);
         this.setDoubleBuffered(true);
+        this.addKeyListener(keyH);
+        this.setFocusable(true);
     }
 
     public void startGameThread() {
@@ -31,18 +42,43 @@ public class GamePanel extends JPanel implements Runnable {
 
     @Override
     public void run() {
+        double drawInterval = 1000000000 / FPS;
+        double delta = 0;
+        double lastTime = System.nanoTime();
+        long currentTime;
+
         while(gameThread != null) {
-            update();
-            repaint();
+            currentTime = System.nanoTime();
+            delta += (currentTime - lastTime) / drawInterval;
+            lastTime = currentTime;
+
+            if(delta >= 1) {
+                update();
+                repaint();
+                delta--;
+            }
         }
     }
 
     public void update() {
-
+        //Move player
+        if(keyH.upPressed) {
+            playerY -= playerSpeed;
+        } else if(keyH.downPressed) {
+            playerY += playerSpeed;
+        } else if(keyH.leftPressed) {
+            playerX -= playerSpeed;
+        } else if(keyH.rightPressed) {
+            playerX += playerSpeed;
+        }
     }
 
     public void paintComponent(Graphics graphics) {
         super.paintComponent(graphics);
+        Graphics2D graphics2d = (Graphics2D) graphics;
+        graphics2d.setColor(Color.white);
+        graphics2d.fillRect(playerX, playerY, tileSize, tileSize);
+        graphics.dispose();
     }
 
 }
diff --git a/src/de/mp/jgame2d/core/KeyHandler.java b/src/de/mp/jgame2d/core/KeyHandler.java
new file mode 100644
index 0000000..cac49e9
--- /dev/null
+++ b/src/de/mp/jgame2d/core/KeyHandler.java
@@ -0,0 +1,50 @@
+package de.mp.jgame2d.core;
+
+import java.awt.event.KeyEvent;
+import java.awt.event.KeyListener;
+
+public class KeyHandler implements KeyListener {
+
+    public boolean upPressed, downPressed, leftPressed, rightPressed;
+
+    @Override
+    public void keyTyped(KeyEvent e) {}
+
+    @Override
+    public void keyPressed(KeyEvent e) {
+        int code = e.getKeyCode();
+        switch (code) {
+            case KeyEvent.VK_W, KeyEvent.VK_UP:
+                upPressed = true;
+                break;
+            case KeyEvent.VK_S, KeyEvent.VK_DOWN:
+                downPressed = true;
+                break;
+            case KeyEvent.VK_A, KeyEvent.VK_LEFT:
+                leftPressed = true;
+                break;
+            case KeyEvent.VK_D, KeyEvent.VK_RIGHT:
+                rightPressed = true;
+                break;
+        }
+    }
+
+    @Override
+    public void keyReleased(KeyEvent e) {
+        int code = e.getKeyCode();
+        switch (code) {
+            case KeyEvent.VK_W,  KeyEvent.VK_UP:
+                upPressed = false;
+                break;
+            case KeyEvent.VK_S,  KeyEvent.VK_DOWN:
+                downPressed = false;
+                break;
+            case KeyEvent.VK_A, KeyEvent.VK_LEFT:
+                leftPressed = false;
+                break;
+            case KeyEvent.VK_D, KeyEvent.VK_RIGHT:
+                rightPressed = false;
+                break;
+        }
+    }
+}