Add camera control

.vscode/launch.json

@@ -0,0 +1,39 @@
+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": "Unity Editor",
+            "type": "unity",
+            "path": "/d:/Codice/LD45/Library/EditorInstance.json",
+            "request": "launch"
+        },
+        {
+            "name": "Windows Player",
+            "type": "unity",
+            "request": "launch"
+        },
+        {
+            "name": "OSX Player",
+            "type": "unity",
+            "request": "launch"
+        },
+        {
+            "name": "Linux Player",
+            "type": "unity",
+            "request": "launch"
+        },
+        {
+            "name": "iOS Player",
+            "type": "unity",
+            "request": "launch"
+        },
+        {
+            "name": "Android Player",
+            "type": "unity",
+            "request": "launch"
+        }
+    ]
+}

Assets/Components/GameController.cs

@@ -4,5 +4,6 @@ using UnityEngine;
 
 public class GameController : MonoBehaviour
 {
-    public float gravitationConstant = 1;
+    [Header("Global Variables")]
+    public float gravitationConstant;
 }

Assets/Components/Gravitation.cs

@@ -2,20 +2,21 @@
 using System.Collections.Generic;
 using UnityEngine;
 
+[RequireComponent(typeof(Rigidbody2D))]
 public class Gravitation : MonoBehaviour
 {    
+    [Header("Forces")]
+    protected Vector3 appliedForce;
+    protected float forcesIntensity;
 
-    public static List<Gravitation> simulatedObjects = null;
+    [Header("Internals")]
-    
+    public static List<Gravitation> simulatedObjects;
-    protected new Rigidbody2D rigidbody;
-
-    protected GameController gameController;
-
     public int positionInList;
 
-    protected Vector3 appliedForce;
+    [Header("References")]
+    protected new Rigidbody2D rigidbody;
+    protected GameController gameController;
 
-    protected float forcesIntensity;
 
     protected float mass {
         get {

Assets/Components/PanWithMMB.cs

@@ -0,0 +1,32 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+[RequireComponent(typeof(Camera))]
+public class PanWithMMB : MonoBehaviour
+{    
+    [Header("References")]
+    protected new Camera camera;
+
+    [Header("Internals")]
+    protected Vector3? lastMousePosition;
+
+    private void Start() {
+        lastMousePosition = null;
+        camera = GetComponent<Camera>();
+    }
+
+    private void Update() {
+        bool mmbIsPressed = Input.GetMouseButton(2);
+        Vector3? currentMousePosition = null;
+        if(mmbIsPressed) {
+            currentMousePosition = camera.ScreenToWorldPoint(Input.mousePosition);
+            if(lastMousePosition.HasValue) {
+                Vector3 positionDelta = lastMousePosition.Value - currentMousePosition.Value;
+                camera.transform.position += positionDelta;
+                currentMousePosition = camera.ScreenToWorldPoint(Input.mousePosition);
+            }
+        }
+        lastMousePosition = currentMousePosition;
+    }
+}

Assets/Components/PanWithMMB.cs.meta

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Assets/Components/SpawnOnMouseClick.cs

@@ -0,0 +1,22 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class SpawnOnMouseClick : MonoBehaviour
+{
+    [Header("Config")]
+    public GameObject prefabToSpawn;
+    public int mouseButton;
+
+    protected Vector3 GetWorldMousePosition() {
+        return Camera.main.ScreenToWorldPoint(Input.mousePosition);
+    }
+
+    void Update()
+    {
+        if(Input.GetMouseButtonDown(mouseButton)) {
+            Vector3 mousePosition = GetWorldMousePosition();
+            GameObject instance = Instantiate(prefabToSpawn, new Vector3(mousePosition.x, mousePosition.y, 0f), Quaternion.identity);
+        }
+    }
+}

Assets/Components/SpawnOnMouseClick.cs.meta

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Assets/Components/ZoomWithScrollWheel.cs

@@ -0,0 +1,27 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+[RequireComponent(typeof(Camera))]
+public class ZoomWithScrollWheel : MonoBehaviour
+{
+    [Header("Config")]
+    public float zoomMultiplier;
+    public string zoomAxisName;
+
+    [Header("References")]
+    protected new Camera camera;
+
+    void Start()
+    {
+        camera = GetComponent<Camera>();
+    }
+
+    void Update()
+    {
+        float mouseWheel = Input.GetAxis(zoomAxisName);
+        if(mouseWheel != 0) {
+            camera.orthographicSize = Mathf.Clamp(camera.orthographicSize - mouseWheel * zoomMultiplier, 0, float.PositiveInfinity);
+        }
+    }
+}

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Assets/Scenes/Game.unity

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