doodle/pkg/doodads/actor.go

38 lines
802 B
Go
Raw Normal View History

package doodads
import (
"git.kirsle.net/apps/doodle/lib/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)
// 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,
}
}