up3

server/item/enchantment/knockback.go

@@ -0,0 +1,48 @@
+package enchantment
+
+import (
+	"github.com/df-mc/dragonfly/server/item"
+	"github.com/df-mc/dragonfly/server/world"
+)
+
+// Knockback is an enchantment to a sword that increases the sword's knock-back.
+var Knockback knockback
+
+type knockback struct{}
+
+// Name ...
+func (knockback) Name() string {
+	return "Knockback"
+}
+
+// MaxLevel ...
+func (knockback) MaxLevel() int {
+	return 2
+}
+
+// Cost ...
+func (knockback) Cost(level int) (int, int) {
+	minCost := 5 + (level-1)*20
+	return minCost, minCost + 50
+}
+
+// Rarity ...
+func (knockback) Rarity() item.EnchantmentRarity {
+	return item.EnchantmentRarityUncommon
+}
+
+// Force returns the increase in knock-back force from the enchantment.
+func (knockback) Force(level int) float64 {
+	return float64(level) / 2
+}
+
+// CompatibleWithEnchantment ...
+func (knockback) CompatibleWithEnchantment(item.EnchantmentType) bool {
+	return true
+}
+
+// CompatibleWithItem ...
+func (knockback) CompatibleWithItem(i world.Item) bool {
+	t, ok := i.(item.Tool)
+	return ok && t.ToolType() == item.TypeSword
+}