108 lines
1.8 KiB
Go
108 lines
1.8 KiB
Go
package engine
|
|
|
|
import (
|
|
"encoding/gob"
|
|
)
|
|
|
|
// Ensure Actor satisfies interfaces.
|
|
var _ Prepper = &Actor{}
|
|
|
|
func init() {
|
|
gob.Register(&Actor{})
|
|
}
|
|
|
|
// Thorson-style movement:
|
|
// https://maddythorson.medium.com/celeste-and-towerfall-physics-d24bd2ae0fc5
|
|
|
|
// Actor handles basic movement.
|
|
type Actor struct {
|
|
CollisionDomain string // id of component to look for colliders inside of
|
|
Pos, Size Point3
|
|
xRem, yRem, zRem float64
|
|
|
|
game *Game
|
|
}
|
|
|
|
func (a *Actor) CollidesAt(p Point3) bool {
|
|
bounds := Box{Min: p, Max: p.Add(a.Size)}
|
|
for c := range a.game.Query(a.CollisionDomain, ColliderType) {
|
|
if c.(Collider).CollidesWith(bounds) {
|
|
return true
|
|
}
|
|
}
|
|
return false
|
|
}
|
|
|
|
func (a *Actor) MoveX(x float64, onCollide func()) {
|
|
a.xRem += x
|
|
move := int(a.xRem + 0.5) // Note: math.Round can lead to vibration
|
|
if move == 0 {
|
|
return
|
|
}
|
|
a.xRem -= float64(move)
|
|
sign := sign(move)
|
|
for move != 0 {
|
|
a.Pos.X += sign
|
|
move -= sign
|
|
if !a.CollidesAt(a.Pos) {
|
|
continue
|
|
}
|
|
if onCollide != nil {
|
|
onCollide()
|
|
}
|
|
a.Pos.X -= sign
|
|
a.xRem = 0
|
|
return
|
|
}
|
|
}
|
|
|
|
func (a *Actor) MoveY(y float64, onCollide func()) {
|
|
a.yRem += y
|
|
move := int(a.yRem + 0.5)
|
|
if move == 0 {
|
|
return
|
|
}
|
|
a.yRem -= float64(move)
|
|
sign := sign(move)
|
|
for move != 0 {
|
|
a.Pos.Y += sign
|
|
move -= sign
|
|
if !a.CollidesAt(a.Pos) {
|
|
continue
|
|
}
|
|
if onCollide != nil {
|
|
onCollide()
|
|
}
|
|
a.Pos.Y -= sign
|
|
a.yRem = 0
|
|
return
|
|
}
|
|
}
|
|
|
|
func (a *Actor) MoveZ(z float64, onCollide func()) {
|
|
a.zRem += z
|
|
move := int(a.zRem + 0.5)
|
|
if move == 0 {
|
|
return
|
|
}
|
|
a.zRem -= float64(move)
|
|
sign := sign(move)
|
|
for move != 0 {
|
|
a.Pos.Z += sign
|
|
move -= sign
|
|
if !a.CollidesAt(a.Pos) {
|
|
continue
|
|
}
|
|
if onCollide != nil {
|
|
onCollide()
|
|
}
|
|
a.Pos.Z -= sign
|
|
a.zRem = 0
|
|
return
|
|
}
|
|
}
|
|
|
|
func (a *Actor) Prepare(g *Game) error {
|
|
a.game = g
|
|
return nil
|
|
}
|