koobas.hobune.stream
Making a Health Bar with Code
I have a damage reciever script, and a health bar script, but I want the health bar to decrease as the player gets hit. How should I do that? Here are my scripts:
Health Bar GUI Script
function OnGUI() {
GUI.backgroundColor = Color.green;
GUI.Button(Rect(10,640,510,20),"Health");
}
Damage Reciever Script
var hitPoints = 100.0;
var detonationDelay = 0.0;
var explosion : GameObject;
var deadReplacement : Rigidbody;
function ApplyDamage (damage : float) { // We already have less than 0 hitpoints, maybe we got killed already? if (hitPoints <= 0.0) return;
hitPoints -= damage;
if (hitPoints <= 0.0) {
// Start emitting particles
var emitter : ParticleEmitter = GetComponentInChildren(ParticleEmitter);
if (emitter)
emitter.emit = true;
Invoke("DelayedDetonate", detonationDelay);
}
}
function DelayedDetonate () { BroadcastMessage ("Detonate"); }
function Detonate () { // Destroy ourselves Destroy(gameObject);
// Create the explosion
if (explosion)
Instantiate (explosion, transform.position, transform.rotation);
// If we have a dead barrel then replace ourselves with it!
if (deadReplacement) {
var dead : Rigidbody = Instantiate(deadReplacement, transform.position, transform.rotation);
// For better effect we assign the same velocity to the exploded barrel
dead.rigidbody.velocity = rigidbody.velocity;
dead.angularVelocity = rigidbody.angularVelocity;
}
// If there is a particle emitter stop emitting and detach so it doesnt get destroyed
// right away
var emitter : ParticleEmitter = GetComponentInChildren(ParticleEmitter);
if (emitter) {
emitter.emit = false;
emitter.transform.parent = null;
}
Destroy (gameObject);
}
// We require the barrel to be a rigidbody, so that it can do nice physics @script RequireComponent (Rigidbody)
The damage reciever script works. All I need is the damage done using the damage reciever to affect the health bar (shorten the width). Thanks in advance!
Also, if you can tell me how to show a percentage of health, that would help.
You don't have to use the Health Bar script exactly to answer this question. The Damage Reciever script has to stay the same though.
It is add in to the Damage Receiver Script.
function OnGUI()
{
GUI.HorizontalScrollbar(Rect (0,40,200,20), 0, hitPoints,0, 100);
}
$$anonymous$$aking a health bar is ridiculously simple in the all new Unity UI. You just need to use a slider to create one and a bit of code. Check this article out Health Bar Unity 4.6
There are seriously tons of posts on this, with examples for rectangular health bars, circular health bars, anything you could imagine.
Here's the top Google result for 'Unity Health Bar':
http://answers.unity3d.com/questions/17255/how-do-i-make-a-health-bar.html
Next time, check around at least a little bit before posting a question, because otherwise folks like me get grumpy.
I know there are other tutorials and other questions like this, but I need to use that specific damage receiver because other scripts depend on that damage receiver so I need help for THIS receiver. Otherwise I would never had asked this question (And I'm with you, I can't stand when people ask questions that have already been answered).
okay, then I'm not understanding your question. What specifically are you trying to do? Is your issue with trying to access variables or methods in one script from another script?
yeah, that's my issue, I don't know how to link the two scripts so the health bar goes down.
Not sure if you were only looking to narrow the width...
var scale = 1.0f;
function OnGUI() {
GUI.backgroundColor = Color.green;
GUI.Button(Rect(10, 640, 510 * scale, 20), "Health");
}
// Call this to update the health.
// Note: 100.0f should be max.
function SetHealth(health : float) {
scale = Mathf.Clamp01(health / 100.0f);
}
I've tried everything, so I'm co$$anonymous$$g back to you. You're right, I'm only trying to narrow the width, and it has to be connected to that damage receiver. Right now, I have one huge script for the player, so the GUI Health Bar will be part of the Health Script. How do I use your script, to make the Health Bar get smaller as the health bar goes down?
yeah, that's my issue, I don't know how to link the two scripts so the health bar goes down.
Alrighty, that's a very reasonable question to ask.
There are a number of ways to link scripts. If you want to do it by hand, create a public variable of type [name of script] and then drop your other script into it in the editor. You can then access public functions in the referenced script like so
otherCode.doSomething();
where otherCode is your reference to the other script and doSomething is your public function.
You can also look into GameObject.Find to get a reference to the game object containing the other function, and then GetComponent to access the script. There are also more advanced things like FindObjectOfType.
Finally, if you just want to send a message to a script in a game object without worrying about what the receiving script is called, you can use SendMessage. Don't know how to use SendMessage, and the script reference is confusing? There are quite a few notes on it here and in the forums.
Best of luck,
Julien
I'm learning. Thank you for showing me how to link scripts but now that scripts are linked, how do I make the health bar decrease for damage?
I started replying to your message, and then something occurred to me: there's an even easier solution I hadn't thought of. You can specify the width of the health bar as a global (static) variable (see http://unity3d.com/support/documentation/ScriptReference/index.$$anonymous$$ember_Variables_26_Global_Variables.html). Then, to set it, all you need to do is call the name of the script and the variable like so:
$$anonymous$$yScriptName.healthBarWidth = [value]
You don't need any reference to the game object or the script component itself - by setting it static, we're telling Unity that we're only going to have one copy of that variable anywhere in the scene. From there, you use Statement's answer he gave below:
function OnGUI() { GUI.backgroundColor = Color.green; GUI.Button(Rect(10, 640, 510 * scale, 20), "Health"); }
where scale is our global/static var.
Here is the solution :
var Health = 100;
var position = Rect (500,15,200,20);
function OnTriggerEnter (Objecte : Collider) {
if (Objecte.tag == "Obstacle")
{
Health -= 50;
}
}
function Update ()
{
if (Health <= 0)
{
Application.LoadLevel (Application.loadedLevel);
}
}
function OnGUI()
{
GUI.backgroundColor = Color.green;
GUI.HorizontalScrollbar(position, 0, Health,0, 100);
}
I updated your answer to make the code readable
