Mouse Buttons

Part of the Unity Scripting Basics section of Coddy's Unity journey. Lesson 22 of 85.

Mouse buttons have their own three methods, and they take the button's number: 0 is the left button, 1 the right, 2 the middle.

Input.GetMouseButtonDown(0): the left button went down on this frame.
Input.GetMouseButton(0): it is down right now, on every frame of the hold.
Input.GetMouseButtonUp(0): it came up on this frame.

They work like the key methods, and Input.GetMouseButtonDown(0) is the same as Input.GetKeyDown(KeyCode.Mouse0). This bell rings once for every click on the game:

public int rings = 0;

void Update()
{
    if (Input.GetMouseButtonDown(0))
    {
        rings++;
        Debug.Log("Ding! " + rings);
    }
}

A click anywhere on the game counts, not only a click on the bell: these methods report the button, not what is under the pointer. Telling which object was clicked takes more code than this. On a phone, Unity reports a tap as mouse button 0, so the bell rings for taps too.

Challenge

Easy

Each click grows the cube, up to size 2.

In Update(), write an if on Input.GetMouseButtonDown(0) && transform.localScale.x < 2f.
Inside it, add new Vector3(0.25f, 0.25f, 0.25f) to transform.localScale.

Press Play and click the game four times: the cube grows to twice its size and stops. Then Check.

Try it yourself

using UnityEngine;

public class Grower : MonoBehaviour
{
    void Update()
    {
        // Each click: grow by 0.25 on every axis, up to size 2.
    }
}