up3

server/entity/lingering_potion.go

@@ -0,0 +1,54 @@
+package entity
+
+import (
+	"github.com/df-mc/dragonfly/server/block/cube"
+	"github.com/df-mc/dragonfly/server/entity/effect"
+	"github.com/df-mc/dragonfly/server/internal/nbtconv"
+	"github.com/df-mc/dragonfly/server/item/potion"
+	"github.com/df-mc/dragonfly/server/world"
+	"github.com/df-mc/dragonfly/server/world/particle"
+)
+
+// NewLingeringPotion creates a new lingering potion. LingeringPotion is a
+// variant of a splash potion that can be thrown to leave clouds with status
+// effects that linger on the ground in an area.
+func NewLingeringPotion(opts world.EntitySpawnOpts, t potion.Potion, owner world.Entity) *world.EntityHandle {
+	colour, _ := effect.ResultingColour(t.Effects())
+
+	conf := splashPotionConf
+	conf.Potion = t
+	conf.Particle = particle.Splash{Colour: colour}
+	conf.Hit = potionSplash(0.25, t, true)
+	conf.Owner = owner.H()
+	return opts.New(LingeringPotionType, conf)
+}
+
+// LingeringPotionType is a world.EntityType implementation for LingeringPotion.
+var LingeringPotionType lingeringPotionType
+
+type lingeringPotionType struct{}
+
+func (t lingeringPotionType) Open(tx *world.Tx, handle *world.EntityHandle, data *world.EntityData) world.Entity {
+	return &Ent{tx: tx, handle: handle, data: data}
+}
+
+func (lingeringPotionType) EncodeEntity() string {
+	return "minecraft:lingering_potion"
+}
+func (lingeringPotionType) BBox(world.Entity) cube.BBox {
+	return cube.Box(-0.125, 0, -0.125, 0.125, 0.25, 0.125)
+}
+
+func (lingeringPotionType) DecodeNBT(m map[string]any, data *world.EntityData) {
+	conf := splashPotionConf
+	conf.Potion = potion.From(nbtconv.Int32(m, "PotionId"))
+	colour, _ := effect.ResultingColour(conf.Potion.Effects())
+	conf.Particle = particle.Splash{Colour: colour}
+	conf.Hit = potionSplash(0.25, conf.Potion, true)
+
+	data.Data = conf.New()
+}
+
+func (lingeringPotionType) EncodeNBT(data *world.EntityData) map[string]any {
+	return map[string]any{"PotionId": int32(data.Data.(*ProjectileBehaviour).conf.Potion.Uint8())}
+}