50 lines
1.5 KiB
Go
50 lines
1.5 KiB
Go
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package item
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import (
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"github.com/df-mc/dragonfly/server/block/cube"
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"github.com/df-mc/dragonfly/server/item/potion"
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"github.com/df-mc/dragonfly/server/world"
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"github.com/df-mc/dragonfly/server/world/sound"
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"math"
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)
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// SplashPotion is an item that grants effects when thrown.
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type SplashPotion struct {
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// Type is the type of splash potion.
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Type potion.Potion
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}
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// MaxCount ...
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func (s SplashPotion) MaxCount() int {
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return 1
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}
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// Use ...
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func (s SplashPotion) Use(tx *world.Tx, user User, ctx *UseContext) bool {
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create := tx.World().EntityRegistry().Config().SplashPotion
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opts := world.EntitySpawnOpts{Position: eyePosition(user), Velocity: throwableOffset(user.Rotation()).Vec3().Mul(0.5)}
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tx.AddEntity(create(opts, s.Type, user))
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tx.PlaySound(user.Position(), sound.ItemThrow{})
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ctx.SubtractFromCount(1)
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return true
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}
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// throwableOffset adds an upwards offset pitch to a throwable entity.
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// In vanilla, items such as Splash Potions, Lingering Potions, and
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// Bottle o' Enchanting are thrown at a higher angle than where the
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// player is looking at.
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// The added offset is an ellipse-like shape based on what the input pitch is.
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func throwableOffset(r cube.Rotation) cube.Rotation {
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r[1] = max(min(r[1], 89.9), -89.9)
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r[1] -= math.Sqrt(89.9*89.9-r[1]*r[1]) * (26.5 / 89.9)
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r[1] = max(min(r[1], 89.9), -89.9)
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return r
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}
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// EncodeItem ...
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func (s SplashPotion) EncodeItem() (name string, meta int16) {
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return "minecraft:splash_potion", int16(s.Type.Uint8())
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}
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