Upgrades

Making your TileEntity upgradeable

In order to make your TileEntity upgradeable, you'll need to implement the Upgradeable interface.
Then, create a UpgradeHolder via getUpgradeHolder and set the allowed upgrade types. After that, you can pass on that upgrade holder to the different energy holders, if you have one.

Calculating upgraded values

While the energy holder automatically changes it's maxEnergy or energyConsumption values, you might want to implement your own logic that is called whenever upgrades change.
To do this, you can either:

• Override the reload method in your TileEntity (make sure to keep the super call) and retrieve the current upgrade modifier for a certain upgrade type by calling UpgradeHolder#getValue(UpgradeType). (The reload method is called whenever an upgrades were added or removed and when reloading configs.)
• Use UpgradeHolder.getValueProvider(UpgradeType) to get a provider that will automatically update whenever the upgrade modifier changes.

override fun reload() {
    super.reload()
    maxIdleTime = (IDLE_TIME / upgradeHolder.getValue(UpgradeType.SPEED)).toInt()
}

val maxIdleTime by upgradeHolder.getValueProvider(UpgradeType.SPEED) { (IDLE_TIME / it).toInt() }

Using the UpgradesGui

The UpgradesGui can easily be added to your TileEntityGui by creating an OpenUpgradesItem with your upgradeHolder.

inner class SolarPanelGui : TileEntityGui() {

    override val gui = Gui.normal()
        .setStructure(
            "1 - - - - - - - 2",
            "| u # # e # # # |",
            "| # # # e # # # |",
            "| # # # e # # # |",
            "3 - - - - - - - 4")
        .addIngredient('e', EnergyBar(3, energyHolder))
        .addIngredient('u', OpenUpgradesItem(upgradeHolder))
        .build()

}

Creating a custom Upgrade Type

Creating an Upgrade Type Registry

Create an UpgradeTypeRegistry singleton object and annotate it with @Init to have it loaded during addon initialization.

@Init(stage = InitStage.PRE_PACK) // (1)!
object UpgradeTypes : UpgradeTypesRegistry by ExampleAddon.registry {

    // (2)!

}

1. Nova will load this class during addon initialization, causing your upgrade types to be registered.
2. Register your upgrade types here

Now, lets actually register an upgrade type. For that we'll need two NovaItems: One for the actual item that is used by players and one for the icon in the GUI, which needs to have an inventory background.

Assuming you have these two items, you can now register your upgrade type:

@Init(stage = InitStage.PRE_PACK)
object UpgradeTypes {

    val MY_UPGRADE_TYPE = registerUpgradeType<Double>(ExampleAddon, "example_upgrade", Items.EXAMPLE_UPGRADE, Items.GUI_EXAMPLE_UPGRADE)

}

Now that you've registered your upgrade type, you will also need to set default values for it. For that, create a file called upgrade_values.yml in your configs/ directory. Then add your upgrade values to it:

example_upgrade: [ 1.0, 1.9, 2.8, 3.7, 4.6, 5.5, 6.4, 7.3, 8.2, 9.1, 10.0 ]

For more information about the upgrade_values.json format, check out Configuration - Upgrade Values.