doodle/pkg/doodads/actor.go

51 lines
1.1 KiB
Go

package doodads
import (
"git.kirsle.net/go/render"
)
// Actor is a reusable run-time drawing component used in Doodle. Actors are an
// active instance of a Doodad which have a position, velocity, etc.
type Actor interface {
ID() string
// Position and velocity, not saved to disk.
Position() render.Point
Velocity() render.Point
Size() render.Rect
Grounded() bool
SetGrounded(bool)
// Actor's elected hitbox set by their script.
// SetHitbox(x, y, w, h int)
// Hitbox() render.Rect
// Movement commands.
MoveBy(render.Point) // Add {X,Y} to current Position.
MoveTo(render.Point) // Set current Position to {X,Y}.
}
// GetBoundingRect computes the full pairs of points for the collision box
// around a doodad actor.
func GetBoundingRect(d Actor) render.Rect {
var (
P = d.Position()
S = d.Size()
)
return render.Rect{
X: P.X,
Y: P.Y,
W: S.W,
H: S.H,
}
}
// GetBoundingRectWithHitbox is like GetBoundingRect but adjusts it for the
// relative hitbox of the actor.
// func GetBoundingRectWithHitbox(d Actor, hitbox render.Rect) render.Rect {
// rect := GetBoundingRect(d)
// rect.W = hitbox.W
// rect.H = hitbox.H
// return rect
// }