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);

Exercise Detect Left Mouse Click

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

Show example solution

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");
        }
    }
}

Test yourself

Which index number represents the right mouse button in Unity?
- 0
- 2
- -1
- 1
Show answer

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

Left Click Check

if (Input.____(0))

Show answer

if (Input.GetMouseButtonDown(0))

Mouse Inputs Matching

0

Left mouse button index
1

Right mouse button index
2

Middle mouse wheel button index
Input.mousePosition

Mouse pixel coordinates on the screen

Next lesson: The new Input System

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