From 93b2788c5851a584f777813dde6db2d07f11c047 Mon Sep 17 00:00:00 2001
From: Ivory <valerie@valnet.xyz>
Date: Wed, 1 Feb 2023 18:16:58 -0500
Subject: [PATCH] camera clamping

---
 src/main/java/xyz/valnet/engine/math/Vector2f.java     |  6 ++++++
 .../java/xyz/valnet/hadean/gameobjects/Camera.java     | 10 ++++++++++
 .../java/xyz/valnet/hadean/gameobjects/Terrain.java    |  2 ++
 3 files changed, 18 insertions(+)

diff --git a/src/main/java/xyz/valnet/engine/math/Vector2f.java b/src/main/java/xyz/valnet/engine/math/Vector2f.java
index a7a3565..daf4e27 100644
--- a/src/main/java/xyz/valnet/engine/math/Vector2f.java
+++ b/src/main/java/xyz/valnet/engine/math/Vector2f.java
@@ -51,4 +51,10 @@ public class Vector2f implements Serializable {
   public String toString() {
     return "<" + x + ", " + y + ">";
   }
+
+  public Vector2f clamp(Box box) {
+    float x = Math.min(Math.max(this.x, box.x), box.x2);
+    float y = Math.min(Math.max(this.y, box.y), box.y2);
+    return new Vector2f(x, y);
+  }
 }
diff --git a/src/main/java/xyz/valnet/hadean/gameobjects/Camera.java b/src/main/java/xyz/valnet/hadean/gameobjects/Camera.java
index 615dbde..ffbc2a5 100644
--- a/src/main/java/xyz/valnet/hadean/gameobjects/Camera.java
+++ b/src/main/java/xyz/valnet/hadean/gameobjects/Camera.java
@@ -31,6 +31,8 @@ public class Camera extends GameObject implements ITransient, IMouseCaptureArea
 
   private float minY, maxY;
 
+  private Box focusBounds = null;
+
   @Override
   public void start() {
     IWorldBoundsAdapter worldBoundsAdapter = get(IWorldBoundsAdapter.class);
@@ -39,6 +41,10 @@ public class Camera extends GameObject implements ITransient, IMouseCaptureArea
     maxY = bounds.w;
   }
 
+  public void setFocusBounds(Box box) {
+    this.focusBounds = box;
+  }
+
   public Vector2f getWorldMouse() {
     return screen2world(App.mouseX, App.mouseY);
   }
@@ -67,6 +73,10 @@ public class Camera extends GameObject implements ITransient, IMouseCaptureArea
       Vector2f dragDifference = screen2world(App.mouseX, App.mouseY).subtract(focus);
       focus = dragOrigin.subtract(dragDifference);
     }
+
+    if(focusBounds != null) {
+      focus = focus.clamp(focusBounds);
+    }
   }
 
   public void focus(float x, float y) {
diff --git a/src/main/java/xyz/valnet/hadean/gameobjects/Terrain.java b/src/main/java/xyz/valnet/hadean/gameobjects/Terrain.java
index 236bd62..2cd8e63 100644
--- a/src/main/java/xyz/valnet/hadean/gameobjects/Terrain.java
+++ b/src/main/java/xyz/valnet/hadean/gameobjects/Terrain.java
@@ -1,5 +1,6 @@
 package xyz.valnet.hadean.gameobjects;
 
+import xyz.valnet.engine.math.Box;
 import xyz.valnet.engine.math.FastNoiseLite;
 import xyz.valnet.engine.math.Vector2i;
 import xyz.valnet.engine.math.Vector4f;
@@ -42,6 +43,7 @@ public class Terrain extends GameObject implements IPathable, IWorldBoundsAdapte
   @Override
   protected void start() {
     camera.focus(WORLD_SIZE / 2, WORLD_SIZE / 2);
+    camera.setFocusBounds(new Box(0, 0, WORLD_SIZE, WORLD_SIZE));
   }
 
   public Tile getTile(int x, int y) {