From 8edcae5adcceb9113d0d9fe199818470679b5a75 Mon Sep 17 00:00:00 2001
From: Chris Cromer <chris@cromer.cl>
Date: Wed, 20 Apr 2022 11:48:11 -0400
Subject: [PATCH] add camera limit script

---
 godot/CameraLimit.gdns      |  8 ++++++
 godot/levels/Level2.tscn    |  2 +-
 godot/levels/Prototype.tscn |  2 +-
 src/CameraLimit.cpp         | 52 +++++++++++++++++++++++++++++++++++++
 src/CameraLimit.h           | 48 ++++++++++++++++++++++++++++++++++
 src/godot.cpp               |  2 ++
 6 files changed, 112 insertions(+), 2 deletions(-)
 create mode 100644 godot/CameraLimit.gdns
 create mode 100644 src/CameraLimit.cpp
 create mode 100644 src/CameraLimit.h

diff --git a/godot/CameraLimit.gdns b/godot/CameraLimit.gdns
new file mode 100644
index 0000000..fe16c94
--- /dev/null
+++ b/godot/CameraLimit.gdns
@@ -0,0 +1,8 @@
+[gd_resource type="NativeScript" load_steps=2 format=2]
+
+[ext_resource path="res://gdnative/alai.tres" type="GDNativeLibrary" id=1]
+
+[resource]
+resource_name = "CameraLimit"
+class_name = "CameraLimit"
+library = ExtResource( 1 )
diff --git a/godot/levels/Level2.tscn b/godot/levels/Level2.tscn
index 13c3651..717c1fe 100644
--- a/godot/levels/Level2.tscn
+++ b/godot/levels/Level2.tscn
@@ -1,6 +1,6 @@
 [gd_scene load_steps=5 format=2]
 
-[ext_resource path="res://camera_fix.gd" type="Script" id=1]
+[ext_resource path="res://CameraLimit.gdns" type="Script" id=1]
 [ext_resource path="res://characters/player/Player.tscn" type="PackedScene" id=2]
 [ext_resource path="res://assets/backgrounds/hills.png" type="Texture" id=3]
 [ext_resource path="res://levels/Level2.tmx" type="PackedScene" id=4]
diff --git a/godot/levels/Prototype.tscn b/godot/levels/Prototype.tscn
index d33d09c..b18e1ae 100644
--- a/godot/levels/Prototype.tscn
+++ b/godot/levels/Prototype.tscn
@@ -1,6 +1,6 @@
 [gd_scene load_steps=5 format=2]
 
-[ext_resource path="res://camera_fix.gd" type="Script" id=1]
+[ext_resource path="res://CameraLimit.gdns" type="Script" id=1]
 [ext_resource path="res://characters/player/Player.tscn" type="PackedScene" id=2]
 [ext_resource path="res://levels/Prototype.tmx" type="PackedScene" id=3]
 [ext_resource path="res://assets/backgrounds/mountains.png" type="Texture" id=4]
diff --git a/src/CameraLimit.cpp b/src/CameraLimit.cpp
new file mode 100644
index 0000000..ca0dae6
--- /dev/null
+++ b/src/CameraLimit.cpp
@@ -0,0 +1,52 @@
+#include "CameraLimit.h"
+
+#include <SceneTree.hpp>
+#include <TileMap.hpp>
+#include <Camera2D.hpp>
+#include <Viewport.hpp>
+#include <Node.hpp>
+
+using namespace godot;
+
+void CameraLimit::_register_methods()
+{
+    register_method("_ready", &CameraLimit::_ready);
+}
+
+CameraLimit::CameraLimit()
+{
+}
+
+CameraLimit::~CameraLimit()
+{
+}
+
+void CameraLimit::_init()
+{
+}
+
+void CameraLimit::_ready()
+{
+    auto node = find_node("Middleground");
+    auto middle_ground = cast_to<TileMap>(node);
+    if (middle_ground != NULL)
+    {
+        auto used_rect = middle_ground->get_used_rect();
+        auto bounds = Vector2(used_rect.position.x + used_rect.size.x, used_rect.position.y + used_rect.size.y - 1);
+        node = get_tree()->get_root()->find_node("Camera2D", true, false);
+        auto camera = cast_to<Camera2D>(node);
+        if (camera != NULL)
+        {
+            camera->set_limit(2, bounds.x * middle_ground->get_cell_size().x);
+            camera->set_limit(3, bounds.y * middle_ground->get_cell_size().y);
+        }
+        else
+        {
+            ERR_PRINT("Could not find Camera2D node!");
+        }
+    }
+    else
+    {
+        ERR_PRINT("Could not find Middleground node!");
+    }
+}
diff --git a/src/CameraLimit.h b/src/CameraLimit.h
new file mode 100644
index 0000000..838d4b5
--- /dev/null
+++ b/src/CameraLimit.h
@@ -0,0 +1,48 @@
+#ifndef ALAI_CAMERA_LIMIT_H
+#define ALAI_CAMERA_LIMIT_H
+
+#include <Godot.hpp>
+#include <Node2D.hpp>
+
+namespace godot
+{
+    class CameraLimit: public Node2D
+    {
+        GODOT_CLASS(CameraLimit, Node2D)
+
+        public:
+            /**
+             * @brief This method registers classes with Godot.
+             * 
+             * @details This method registers methods, properties, and signals with the Godot engine.
+             */
+            static void _register_methods();
+
+            /**
+             * @brief Construct a new Camera Limit object.
+             * 
+             */
+            CameraLimit();
+
+            /**
+             * @brief Destroy the Camera Limit object.
+             * 
+             */
+            ~CameraLimit();
+
+            /**
+             * @brief Initialize the class from Godot.
+             * 
+             * @details This method is called just once when the Godot engine connects to the instance of the class.
+             */
+            void _init();
+
+            /**
+             * @brief Code to be run when ready.
+             * 
+             * @details This method is run when all the children of this node are ready.
+             */
+            void _ready();
+    };
+}
+#endif
diff --git a/src/godot.cpp b/src/godot.cpp
index 76e07ec..1c56d09 100644
--- a/src/godot.cpp
+++ b/src/godot.cpp
@@ -3,6 +3,7 @@
 #include "state_machine/StateMachine.h"
 #include "state_machine/State.h"
 #include "Main.h"
+#include "CameraLimit.h"
 #include "player/Player.h"
 #include "player/states/PlayerIdle.h"
 #include "player/states/PlayerMove.h"
@@ -42,6 +43,7 @@ extern "C" void GDN_EXPORT godot_nativescript_init(void *handle)
     register_class<StateMachine>();
     register_class<State>();
     register_class<main::Main>();
+    register_class<CameraLimit>();
     register_class<player::Player>();
     register_class<player::PlayerIdle>();
     register_class<player::PlayerMove>();