Shoot cannonballs at the push of a button

Questions & Answers
1

Hello everyone !

I’m creating a mobile game. It’s a little game with a cannon firing bullets. I used the instantinate function to duplicate the gameobjects (cannonball). It works very well in itself but it is necessary to define a key to allow the cannon to shoot. But here’s the problem: it’s a mobile game and to shoot you have to use the key on the keyboard. I put a UI Button on the canvas for the gun to fire. I put scripts in it, I tried many things, nothing happens …

How can I fire my cannon without using the keys? (button)

Here is the script :

using System.Collections;
using UnityEngine;

public class CannonBallSpawn : MonoBehaviour
{
	public Rigidbody CannonBallPrefab;
	public Transform barrelEnd;

	void Update()
    {
		if (Input.GetButtonDown ("Shoot")) 
		
	{
			Rigidbody cannonBallInstance;
			cannonBallInstance = Instantiate(CannonBallPrefab, barrelEnd.position, barrelEnd.rotation) as Rigidbody;
			cannonBallInstance.AddForce(barrelEnd.forward * 4000);
	}
	
	}

}
2

First create a separate method for shooting like so:

public void Shoot() {
    Rigidbody cannonBallInstance = Instantiate(CannonBallPrefab, barrelEnd.position, barrelEnd.rotation) as Rigidbody;
    cannonBallInstance.AddForce(barrelEnd.forward * 4000);
}

Then you can activate it in 2 different ways:

  1. From a button on canvas, you simply add a listener to the button in the inspector, drag the object with the scrip onto it and select the Shoot method from the dropdown list.

  2. From touching the screen, this can be as simple as:

    void Update() {
    if(Input.GetMouseButtonDown(0)) {
    Shoot();
    }
    }