75 lines
1.9 KiB
Go
75 lines
1.9 KiB
Go
package doodads
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import (
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"git.kirsle.net/go/render"
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)
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// Actor is a reusable run-time drawing component used in Doodle. Actors are an
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// active instance of a Doodad which have a position, velocity, etc.
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type Actor interface {
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ID() string
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// Position and velocity, not saved to disk.
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Position() render.Point
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Velocity() render.Point
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Size() render.Rect
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Grounded() bool
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SetGrounded(bool)
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// Actor's elected hitbox set by their script.
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// SetHitbox(x, y, w, h int)
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// Hitbox() render.Rect
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// Movement commands.
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MoveBy(render.Point) // Add {X,Y} to current Position.
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MoveTo(render.Point) // Set current Position to {X,Y}.
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}
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// GetBoundingRect computes the full pairs of points for the bounding box of
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// the actor.
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//
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// The X,Y coordinates are the position in the level of the actor,
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// The W,H are the size of the actor's drawn box.
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func GetBoundingRect(d Actor) render.Rect {
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var (
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P = d.Position()
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S = d.Size()
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)
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return render.Rect{
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X: P.X,
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Y: P.Y,
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W: S.W,
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H: S.H,
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}
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}
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// GetBoundingRectHitbox returns the bounding rect of the Actor taking into
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// account their self-declared collision hitbox.
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//
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// The rect returned has the X,Y coordinate set to the actor's position, plus
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// the X,Y of their hitbox, if any.
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//
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// The W,H of the rect is the W,H of their declared hitbox.
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//
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// If the actor has NOT declared its hitbox, this function returns exactly the
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// same way as GetBoundingRect() does.
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func GetBoundingRectHitbox(d Actor, hitbox render.Rect) render.Rect {
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rect := GetBoundingRect(d)
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if !hitbox.IsZero() {
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rect.X += hitbox.X
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rect.Y += hitbox.Y
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rect.W = hitbox.W
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rect.H = hitbox.H
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}
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return rect
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}
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// GetBoundingRectWithHitbox is like GetBoundingRect but adjusts it for the
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// relative hitbox of the actor.
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// func GetBoundingRectWithHitbox(d Actor, hitbox render.Rect) render.Rect {
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// rect := GetBoundingRect(d)
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// rect.W = hitbox.W
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// rect.H = hitbox.H
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// return rect
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// }
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