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Mouse input

Learn Input.GetMouseButton and mouse position.

Mouse Buttons: GetMouseButton

In Unity, Input.GetMouseButton and its variants are used to detect mouse clicks. A button index is passed as a parameter: 0 for left mouse button, 1 for right mouse button, and 2 for middle mouse button (scroll wheel). For instance, to catch the first frame of a left-click, call Input.GetMouseButtonDown(0).

if (Input.GetMouseButtonDown(0))
{
    Debug.Log("Left mouse button clicked!");
}

Mouse Position: Input.mousePosition

The Input.mousePosition property returns the current pixel coordinates of the mouse on screen as a Vector3. The bottom-left corner of the screen is at coordinates (0, 0). This value is frequently used for user interface (UI) interactions or aiming toward the cursor.

Vector3 mousePos = Input.mousePosition;
Debug.Log("Mouse X: " + mousePos.x);

Practice Detect Left Mouse Click

If Input.GetMouseButtonDown(0) is true, execute Debug.Log("Ates edildi");.

Starter code

Player.cs
using System;

public static class Input
{
    public static bool GetMouseButtonDown(int button) => button == 0;
}

public static class Debug
{
    public static void Log(object message) => Console.WriteLine(message);
}

public class Program
{
    public static void Main()
    {
        // 0 nolu fare tusuna basildiginda "Ates edildi" yazdir
    }
}

Sample solution

Player.cs
using System;

public static class Input
{
    public static bool GetMouseButtonDown(int button) => button == 0;
}

public static class Debug
{
    public static void Log(object message) => Console.WriteLine(message);
}

public class Program
{
    public static void Main()
    {
        if (Input.GetMouseButtonDown(0))
        {
            Debug.Log("Ates edildi");
        }
    }
}

Expected output

Ates edildi

Questions and answers

Review the lesson questions together with their answers. To test yourself, solve the lesson interactively.

1 Which index number represents the right mouse button in Unity?

  • 0
  • 2
  • -1
  • 1 Correct answer

Explanation: In mouse buttons, 0 is left button, 1 is right button, and 2 is middle scroll wheel button.

2 Left Click Check

Question 
if (Input.____(0))
Answer 
if (Input.GetMouseButtonDown(0))

Explanation: To detect the initial frame the left mouse button is pressed, GetMouseButtonDown(0) is used.

3 Mouse Inputs Matching

Term Meaning
0 Left mouse button index
1 Right mouse button index
2 Middle mouse wheel button index
Input.mousePosition Mouse pixel coordinates on the screen

All lessons in Beginner

1 What is game development?

  1. Intro to game development
  2. Game engines
  3. 2D and 3D games
  4. The game loop
  5. The scene concept
  6. Summary - Game dev fundamentals

2 Unity setup

  1. Installing Unity Hub
  2. Creating your first project
  3. The editor interface
  4. Toolbar and playback
  5. Saving the project
  6. Summary - Unity setup

3 First scene project

  1. Project overview
  2. Camera and light
  3. Your first cube in the scene
  4. Adding a material
  5. Testing in Play mode
  6. Summary - First scene

4 The GameObject concept

  1. What is a GameObject?
  2. Components
  3. The Hierarchy window
  4. Editing with the Inspector
  5. Tags and Layers
  6. Summary - GameObject

5 C# script basics

  1. Your first C# script
  2. using and namespace
  3. Class structure
  4. Variables and types
  5. Output with Debug.Log
  6. Summary - C# basics

6 MonoBehaviour

  1. What is MonoBehaviour?
  2. The Start method
  3. The Update method
  4. Awake vs Start
  5. SerializeField and public
  6. Summary - MonoBehaviour

7 Transform

  1. What is Transform?
  2. Changing position
  3. Moving with Translate
  4. Changing rotation
  5. Local vs world space
  6. Summary - Transform

8 Input

  1. The Input class
  2. Axis input
  3. Mouse input
  4. The new Input System
  5. Movement vector
  6. Summary - Input

9 Physics (Rigidbody/Collider)

  1. What is a Rigidbody?
  2. What is a Collider?
  3. Applying force with AddForce
  4. Collision events
  5. Trigger events
  6. Summary - Physics

10 2D Sprite

  1. What is a Sprite?
  2. SpriteRenderer
  3. Sprite import settings
  4. Sprite sorting
  5. Preparing sprite animation
  6. Summary - 2D Sprite

11 Godot basics

  1. The Godot editor
  2. A new project
  3. The scene tree
  4. The Node concept
  5. Saving the project
  6. Summary - Godot basics

12 GDScript

  1. What is GDScript?
  2. extends and variables
  3. Function definition
  4. Output with print
  5. Type hints
  6. Summary - GDScript

13 Node and Scene

  1. Node2D and Sprite2D
  2. Saving a scene
  3. Scene instance
  4. The _ready method
  5. The _process method
  6. Summary - Node and Scene

14 Beginner final

  1. Challenge 1: Print a score
  2. Challenge 2: Movement vector
  3. Challenge 3: Godot ready
  4. Challenge 4: Collision log
  5. Challenge 5: Final synthesis