94 lines
3.1 KiB
JavaScript
94 lines
3.1 KiB
JavaScript
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const { Vec3 } = require('vec3')
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module.exports = inject
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// https://minecraft.fandom.com/wiki/Explosion
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function calcExposure (playerPos, explosionPos, world) {
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const dx = 1 / (0.6 * 2 + 1)
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const dy = 1 / (1.8 * 2 + 1)
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const dz = 1 / (0.6 * 2 + 1)
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const d3 = (1 - Math.floor(1 / dx) * dx) / 2
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const d4 = (1 - Math.floor(1 / dz) * dz) / 2
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let sampled = 0
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let exposed = 0
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const pos = new Vec3(0, 0, 0)
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for (pos.y = playerPos.y; pos.y <= playerPos.y + 1.8; pos.y += 1.8 * dy) {
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for (pos.x = playerPos.x - 0.3 + d3; pos.x <= playerPos.x + 0.3; pos.x += 0.6 * dx) {
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for (pos.z = playerPos.z - 0.3 + d4; pos.z <= playerPos.z + 0.3; pos.z += 0.6 * dz) {
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const dir = pos.minus(explosionPos)
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const range = dir.norm()
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if (world.raycast(explosionPos, dir.normalize(), range) === null) {
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exposed++
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}
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sampled++
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}
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}
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}
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return exposed / sampled
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}
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// https://minecraft.fandom.com/wiki/Armor#Damage_protection
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function getDamageAfterAbsorb (damages, armorValue, toughness) {
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const var3 = 2 + toughness / 4
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const var4 = Math.min(Math.max(armorValue - damages / var3, armorValue * 0.2), 20)
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return damages * (1 - var4 / 25)
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}
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// https://minecraft.fandom.com/wiki/Attribute#Operations
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function getAttributeValue (prop) {
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let X = prop.value
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for (const mod of prop.modifiers) {
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if (mod.operation !== 0) continue
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X += mod.amount
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}
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let Y = X
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for (const mod of prop.modifiers) {
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if (mod.operation !== 1) continue
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Y += X * mod.amount
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}
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for (const mod of prop.modifiers) {
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if (mod.operation !== 2) continue
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Y += Y * mod.amount
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}
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return Y
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}
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function inject (bot) {
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const damageMultiplier = 7 // for 1.12+ 8 for 1.8 TODO check when the change occur (likely 1.9)
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const armorThoughnessKey = 'generic.armorToughness' // was renamed in 1.16
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const difficultyValues = {
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peaceful: 0,
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easy: 1,
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normal: 2,
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hard: 3
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}
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bot.getExplosionDamages = (targetEntity, sourcePos, power, rawDamages = false) => {
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const distance = targetEntity.position.distanceTo(sourcePos)
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const radius = 2 * power
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if (distance >= radius) return 0
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const exposure = calcExposure(targetEntity.position, sourcePos, bot.world)
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const impact = (1 - distance / radius) * exposure
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let damages = Math.floor((impact * impact + impact) * damageMultiplier * power + 1)
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// The following modifiers are constant for the input targetEntity and doesnt depend
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// on the source position, so if the goal is to compare between positions they can be
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// ignored to save computations
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if (!rawDamages && targetEntity.attributes['generic.armor']) {
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const armor = getAttributeValue(targetEntity.attributes['generic.armor'])
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const armorToughness = getAttributeValue(targetEntity.attributes[armorThoughnessKey])
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damages = getDamageAfterAbsorb(damages, armor, armorToughness)
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// TODO: protection enchantment and resistance effects
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if (targetEntity.type === 'player') damages *= difficultyValues[bot.game.difficulty] * 0.5
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} else if (!rawDamages && !targetEntity.attributes['generic.armor']) {
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return null
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}
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return Math.floor(damages)
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}
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}
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