From 7b3a8bca0f26ab0aca96e177479d5144d0e4c0b5 Mon Sep 17 00:00:00 2001
From: Maurice <maurice@miaurizius.de>
Date: Sat, 13 Dec 2025 14:06:01 +0100
Subject: [PATCH] implement day-night cycle with dynamic lighting adjustments

---
 .../jgame2d/environment/Lighting.java         | 63 ++++++++++++++++++-
 1 file changed, 60 insertions(+), 3 deletions(-)

diff --git a/src/de/miaurizius/jgame2d/environment/Lighting.java b/src/de/miaurizius/jgame2d/environment/Lighting.java
index 3bb3b8b..71f754d 100644
--- a/src/de/miaurizius/jgame2d/environment/Lighting.java
+++ b/src/de/miaurizius/jgame2d/environment/Lighting.java
@@ -9,6 +9,9 @@ public class Lighting {
 
     GamePanel panel;
     BufferedImage darknessFilter;
+    int dayCount;
+    float filterAlpha;
+    DayState dayState = DayState.DAY;
 
     public Lighting(GamePanel panel) {
         this.panel = panel;
@@ -16,12 +19,59 @@ public class Lighting {
     }
 
     public void draw(Graphics2D g2) {
+        g2.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, filterAlpha));
         g2.drawImage(darknessFilter, 0, 0, null);
+        g2.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 1F));
+
+         // DEBUG
+        String s;
+        switch (dayState) {
+            case DAY -> s = "DAY";
+            case DUSK -> s = "DUSK";
+            case NIGHT -> s = "NIGHT";
+            case DAWN -> s = "DAWN";
+            default -> s = "UNKNOWN";
+        }
+        g2.setColor(Color.white);
+        g2.setFont(g2.getFont().deriveFont(50f));
+        g2.drawString(s, 800, 500);
     }
     public void update() {
-        if(!panel.player.lightUpdated) return;
-        setLightSource();
-        panel.player.lightUpdated = false;
+        if(panel.player.lightUpdated) {
+            setLightSource();
+            panel.player.lightUpdated = false;
+        }
+
+        switch (dayState) {
+            case DAY -> {
+                dayCount++;
+                if (dayCount > 600) { //10 seconds
+                    dayState = DayState.DUSK;
+                    dayCount = 0;
+                }
+            }
+            case DUSK -> {
+                filterAlpha += 0.001f;
+                if (filterAlpha > 1f) {
+                    filterAlpha = 1f;
+                    dayState = DayState.NIGHT;
+                }
+            }
+            case NIGHT -> {
+                dayCount++;
+                if (dayCount > 600) { //10 seconds
+                    dayState = DayState.DAWN;
+                    dayCount = 0;
+                }
+            }
+            case DAWN -> {
+                filterAlpha -= 0.001f;
+                if (filterAlpha < 0f) {
+                    filterAlpha = 0f;
+                    dayState = DayState.DAY;
+                }
+            }
+        }
     }
 
     // ...
@@ -69,4 +119,11 @@ public class Lighting {
         return new RadialGradientPaint(centerX, centerY, (panel.player.currentLight == null ? 75 : panel.player.currentLight.lightRadius), fraction, color);
     }
 
+    public enum DayState {
+        DAY,
+        DUSK,
+        NIGHT,
+        DAWN,
+    }
+
 }