Cost Formulae

As of TokenEnchant v15, you can also define various different costing formulae to calculate how much does it cost to enchant a certain enchantment at a certain level.

You can specify any costing function defined in the CostFormulae.js and specify it in each Custom Enchantment’s cost_formula: option. Or you can define the default cost formula in TokenEnchant’s config.yml using DefaultFormula: option. The default DefaultFormula: value is linear_diff.

default CostFormulae.js

//CostFormulae.js
/*
base: base price set in price: option,
current: current level,
next: target level,
*/

function constant(base, current, next) {
    return base;
}

function constant_diff(base, current, next) {
    return base * (next - current);
}

function linear_diff(base, current, next) {
    var ret = 0;
    current++;
    next++;
    for (var i = current; i < next; i++) {
        ret += (i * base);
    }
    return ret;
}

function exponential1(base, current, next) {
    var ret = 0;
    for (var i = current; i < next; i++) {
        ret += base * Math.pow(i, 1.8);
    }
    return ret;
}

function power2(base, current, next) {
    var ret = 0;
    for (var i = current; i < next; i++) {
        ret += base * Math.pow(2, i);
    }
    return ret;
}

function step(base, current, next) {
    var unit_cost;
    if (next < 5)        // level 0 - 4
        unit_cost = 10;
    else if (next < 10)  // level 5 - 9
        unit_cost = 20;
    else                 // level 10 and above
        unit_cost = 50;
    return (next - current) * unit_cost;
}

Examples

• If We wish to have a step function (each level up costs 10 between level 0 - 4, and costs 20 between level 5 - 9, and costs 50 at level 10 and above) for the Excavation enchantment, we can do something like below. The option value step is the name of the function (function step(base, current, next)) in the CostFormulae.js. With this option, even when the default costing function is linear_diff, step function will be used to calculate the cost for leveling up the Excavation custom enchantment.

  Potions:
  Excavation:
    description: "It is just like Explosive but it will remove entire cuboid!"
    event_map:
      BlockBreakEvent: "HIGHEST"
      TEBlockExplodeEvent: "MONITOR"
    price: 10
    max: 10
    cost_formula: step
  ...