How to detect if a user taps at the same time as two objects collide.

Questions & Answers
1

I have a protagonist that can shield itself when the user taps and unshield on release. I want the protagonist to gain health if the user taps at the exact moment a hazard collides with the protaginist.

How should i go about doing this? Thanks in advance.

2

You can implement this in the OnCollisionEnter function. Something like this:

void OnCollisionEnter(Collision coll) {
if(getTouch() && coll.gameObject.tag == "hazard_object_tag") {
//increase health
} 
}

You will have to add it to an existing or a new script on your character. hazard_object_tag is the tag attach to the objects you consider hazardous in the game.

3

It didn’t work. I used the above code but all its doing is increasing my characters health even if the user taps and holds way before hand. I want it kind of like a rhythm game like guitar hero. You will gain health if you perfectly time your taps.

4

First of all, if you demand exact timing with the collision, your game would be impossible. So I assume you mean that ‘If user taps close enough compared to time of collision, that increases health’.

So something like this should work:

Introduce some variables in your script:

	//Time when user has tapped
	private float lastTapTime;

	//Time when collision has happened
	private float lastCollisionTime;

	//This is the time around the collision time 
        //when tap is accepted
	//to be close enough, so in this case
	//user can tap 0.05 seconds before or after the collision
	private float acceptedTimeFrame = 0.05f;

Then in your OnCollisionEnter just set:

lastCollisionTime = Time.time

And in your Update:

void Update()
{
	if (Input.touchCount > 0 && Input.GetTouch(0).phase == TouchPhase.Began) 
	{
		lastTapTime = Time.time;
	}

	if(Mathf.Abs(lastTapTime-lastCollisionTime)<acceptedTimeFrame)
	{
		//Increase the health
	}

}

You might not want to accept taps which are too close to eachother (so player cant just ‘tap, tap, tap’ all the time), but I think you’ll figure it out how to do it if needed.

I didn’t actually test the code, but the idea at least should be in the right direction.