105 lines
3.0 KiB
Go
105 lines
3.0 KiB
Go
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package entity
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import (
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"github.com/df-mc/dragonfly/server/block"
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"github.com/df-mc/dragonfly/server/world"
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"github.com/go-gl/mathgl/mgl64"
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"math"
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"time"
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)
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// PassiveBehaviourConfig holds optional parameters for a PassiveBehaviour.
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type PassiveBehaviourConfig struct {
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// Gravity is the amount of Y velocity subtracted every tick.
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Gravity float64
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// Drag is used to reduce all axes of the velocity every tick. Velocity is
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// multiplied with (1-Drag) every tick.
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Drag float64
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// ExistenceDuration is the duration that an entity with this behaviour
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// should last. Once this time expires, the entity is closed. If
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// ExistenceDuration is 0, the entity will never expire automatically.
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ExistenceDuration time.Duration
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// Expire is called when the entity expires due to its age reaching the
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// ExistenceDuration.
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Expire func(e *Ent, tx *world.Tx)
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// Tick is called for every tick that the entity is alive. Tick is called
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// after the entity moves on a tick.
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Tick func(e *Ent, tx *world.Tx)
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}
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func (conf PassiveBehaviourConfig) Apply(data *world.EntityData) {
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data.Data = conf.New()
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}
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// New creates a PassiveBehaviour using the parameters in conf.
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func (conf PassiveBehaviourConfig) New() *PassiveBehaviour {
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if conf.ExistenceDuration == 0 {
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conf.ExistenceDuration = math.MaxInt64
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}
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return &PassiveBehaviour{conf: conf, fuse: conf.ExistenceDuration, mc: &MovementComputer{
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Gravity: conf.Gravity,
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Drag: conf.Drag,
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DragBeforeGravity: true,
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}}
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}
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// PassiveBehaviour implements Behaviour for entities that act passively. This
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// means that they can move, but only under influence of the environment, which
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// includes, for example, falling, and flowing water.
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type PassiveBehaviour struct {
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conf PassiveBehaviourConfig
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mc *MovementComputer
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close bool
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fallDistance float64
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fuse time.Duration
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}
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// Explode adds velocity to a passive entity to blast it away from the
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// explosion's source.
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func (p *PassiveBehaviour) Explode(e *Ent, src mgl64.Vec3, impact float64, _ block.ExplosionConfig) {
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e.data.Vel = e.data.Vel.Add(e.data.Pos.Sub(src).Normalize().Mul(impact))
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}
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// Fuse returns the leftover time until PassiveBehaviourConfig.Expire is called,
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// or -1 if this function is not set.
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func (p *PassiveBehaviour) Fuse() time.Duration {
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if p.conf.Expire != nil {
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return p.fuse
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}
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return -1
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}
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// Tick implements the behaviour for a passive entity. It performs movement and
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// updates its state.
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func (p *PassiveBehaviour) Tick(e *Ent, tx *world.Tx) *Movement {
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if p.close {
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_ = e.Close()
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return nil
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}
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m := p.mc.TickMovement(e, e.data.Pos, e.data.Vel, e.data.Rot, tx)
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e.data.Pos, e.data.Vel = m.pos, m.vel
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p.fallDistance = math.Max(p.fallDistance-m.dvel[1], 0)
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p.fuse = p.conf.ExistenceDuration - e.Age()
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if p.conf.Tick != nil {
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p.conf.Tick(e, tx)
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}
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if p.Fuse()%(time.Second/4) == 0 {
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for _, v := range tx.Viewers(m.pos) {
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v.ViewEntityState(e)
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}
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}
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if e.Age() > p.conf.ExistenceDuration {
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p.close = true
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if p.conf.Expire != nil {
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p.conf.Expire(e, tx)
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}
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}
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return m
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}
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