Simple Health Bar
Health for everyone!
Health, Energy, Mana, Stamina, ... All these attributes are usually represented as a UI element. The Stats module provides a very simple way of showing those and define rules when they change.
This section assumes you have at least read once the rest of the Stats documentation and you know what's the difference between a Stat and an Attribute.
We recommend opening the Stats Examples while reading this documentation section. In particular a scene named Example 1.
Health Attribute
Let's start from the beginning. In order to represent the health we need two create to elements:
A Stat that defines the maximum amount of health
An Attribute that holds the current amount of health
To do so, open the Preferences Window and click on Stats. If you have the Example 1 scene open, you'll see there are a bunch of stats. The one that defines the maximum amount of health is called vitality.
The Attributes tab also has a some elements. As its name implies, the health attribute is the one that handles the health gauge and has the vitality stat bound.
To represent the UI all we need to do is to create a Canvas UI object and add the Attribute UI component. This component allows to display a information about an Attribute in different formats and automatically updates the information when the attribute changes.
The example that comes with the Stats module has a prefab called Canvas-Health which displays both the health and mana attributes.
Damage & Heal
To damage and heal the player all we need to do is to use an Action called Change Attribute. This instruction allows to set, add and multiply an attribute by a value (which can be a constant value or a variable).
In this case we've added a Trigger component set to be fired when the user left-clicks the red/green box and calls the Action Change Attribute. To heal we add +10 to the Player's health attribute and we add -10 when we want to damage.
An Attribute is always clamped between 0 and the Stat value, so subtracting -10 to an attribute which its current value is 2 won't be -8, but 0.
Pretty simple, right? Let's take a look at a more advanced example in the next section!
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