110 lines
2.5 KiB
Go
110 lines
2.5 KiB
Go
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package entity
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import (
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"time"
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"edgaru089.ml/go/gl01/internal/util"
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"edgaru089.ml/go/gl01/internal/util/itype"
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"edgaru089.ml/go/gl01/internal/world"
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)
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// EntityBehaviour describes the behaviour of a type of entity with the same Name.
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type EntityBehaviour interface {
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// Name returns the type Name of the behaviour.
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Name() string
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// Hitbox gets the size of the hitbox of the entity.
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//
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// The hitbox is positioned with the position coordinates pointing to
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// the center of the bottom of the box.
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Hitbox(pos itype.Vec3d, dataset itype.Dataset) itype.Vec3d
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// EyeHeight gets the height of the eye of the entity.
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EyeHeight(pos itype.Vec3d, dataset itype.Dataset) float64
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// Update is called on every frame.
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// It should be used to update physics.
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Update(pos itype.Vec3d, dataset itype.Dataset, world *world.World, deltaTime time.Duration)
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}
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var behaviour = make(map[string]EntityBehaviour)
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// RegisterEntityBehaviour registers behaviour with the name of b.Name().
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//
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// If the name is already taken, false is returned and nothing is done.
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// Otherwise, true is returned and the entity is registered.
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func RegisterEntityBehaviour(b EntityBehaviour) bool {
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if _, ok := behaviour[b.Name()]; ok {
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return false
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}
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behaviour[b.Name()] = b
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return true
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}
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// Entity is a struct holding a Behaviour, a Position and a Speed.
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type Entity struct {
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b EntityBehaviour
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pos, speed itype.Vec3d // pos has a origin of the **center of the bottom** of the hitbox
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ds itype.Dataset
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name string // a shortcut to b.Name(), the typename
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onGround bool
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worldbox []itype.Boxd
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hp []itype.Vec3d
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}
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func NewEntity(typename string, pos itype.Vec3d) *Entity {
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var b EntityBehaviour
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var ok bool
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if b, ok = behaviour[typename]; !ok {
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return nil
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}
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return &Entity{
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b: b,
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pos: pos,
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name: typename,
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}
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}
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func (e *Entity) Position() itype.Vec3d {
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return e.pos
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}
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func (e *Entity) SetPosition(pos itype.Vec3d) {
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e.pos = pos
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}
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func (e *Entity) Speed() itype.Vec3d {
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return e.speed
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}
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func (e *Entity) SetSpeed(speed itype.Vec3d) {
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e.speed = speed
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}
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func (e *Entity) Hitbox() itype.Vec3d {
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return e.b.Hitbox(e.pos, e.ds)
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}
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func (e *Entity) Accelerate(x, y, z float64) {
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/*e.speed[0] += x
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e.speed[1] += y
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e.speed[2] += z*/
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vec := itype.Vec3d{x, y, z}
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e.speed = util.BunnyhopAccelerate(vec, e.speed, vec.Length(), 8)
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}
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func (e *Entity) OnGround() bool {
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return e.onGround
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}
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func (e *Entity) EyeHeight() float64 {
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return e.b.EyeHeight(e.pos, e.ds)
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}
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func (e *Entity) EyePosition() itype.Vec3d {
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return e.pos.Addv(0, e.EyeHeight(), 0)
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}
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