53 lines
1.3 KiB
Go
53 lines
1.3 KiB
Go
package collision
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import "git.kirsle.net/go/render"
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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(a Actor) render.Rect {
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var (
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P = a.Position()
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S = a.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(a Actor, hitbox render.Rect) render.Rect {
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rect := GetBoundingRect(a)
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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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// SizePlusHitbox adjusts an actor's canvas Size() to better fit the
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// declared Hitbox by the actor's script.
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func SizePlusHitbox(size render.Rect, hitbox render.Rect) render.Rect {
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size.X += hitbox.X
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size.Y += hitbox.Y
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size.W -= size.W - hitbox.W
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size.H -= size.H - hitbox.H
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return size
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}
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