Table of Contents

1 damage reduction area too fast

2 double health bar methoda>

Speed ​​controls the speed of injury reduction

Final effect

Tutorials Learned

[unity2021 introductory tutorial] 69-2D game development tutorial series-03-RubyAdventure2DRpg official tutorial-17- set the blood drop area _ beep mile _bilibili

1 damage reduction area too fast

As before, this blog is still based on the introductory tutorial of station B.The reason is also very simple. I encountered the following problems when I followed the tutorial to learn to set the blood drop area:

If you only use OnTriggerStay for damage reduction, since this call isframe, which will cause the problem of damage reduction area too fast.

Following the tutorial method, I modified the Sleeping Mode in the Rigidbody2D component of the player object, but the effect of delaying was not achieved, and there was no way to control the speed of blood reduction.

2 double health bar method

The so-called double health bar is actually adding two true and false blood reduction variables.

• The true health bar is used to reduce damage to the current blood volume
• The fake health bar is used to control damage reduction over time

Based on the original code given by the tutorial, I have newly defined some parameters:

• damageSpeed——public, users can control the speed of blood loss
• TruedamageHealth - Multiply with Speed ​​to become true health bar reduction
• True&round - used to determine whether to call ChangeHealth()

For details, see the following trigger script for the damage reduction area

using System.Collections;using System.Collections.Generic;using UnityEngine;public class DamageZone : MonoBehaviour{public int damageHealth = -1;public int damageSpeed;private double TruedamageHealth = -0.02;private double True = 0;int round=1;private void OnTriggerStay2D(Collider2D other){RubyController rubyController=other.GetComponent();if(rubyController != null){True += damageSpeed*TruedamageHealth;if (round==1||True < round * damageHealth){round++;rubyController.ChangeHealth(damageHealth);}}}}

The ChangeHealth() method is a method defined in the script attached to the player object:

 //Change the life value//amount is the operation of adding/reducing blood in the gamepublic void ChangeHealth(int amount){//Limit the current health value range to [0,maxHealth]currentHealth = Mathf.Clamp(currentHealth + amount, 0, maxHealth);// outputif(currentHealth < maxHealth)Debug.Log("The current health value is: " + currentHealth + "/" + maxHealth);}

Among them, the case of round==1 is raised separately as one of the or conditions, because the situation of the game itself is considered.When the player walks into the Trigger, the blood will be reduced immediately, and Stay will slowly reduce the blood in the damage reduction range:

Enter the damage reduction trigger range -> immediately reduce damage -> stay in the damage reduction trigger range -> continue to dropblood

Speed ​​controls damage reduction speed

Final effect

The player entered the damage zone

Injuries

Of course, the above is just a super simple method. In the future study, for example, the GUI blood bar reflects the blood volume, etc., and will be supplemented at that time.