128 lines
3.4 KiB
Go
128 lines
3.4 KiB
Go
package engine
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import (
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"image"
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"io/fs"
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"reflect"
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"github.com/hajimehoshi/ebiten/v2"
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)
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// Reflection types used for queries... Is there a better way?
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var (
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// TypeOf(pointer to interface).Elem() is "idiomatic" -
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// see https://pkg.go.dev/reflect#example-TypeOf
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AnimerType = reflect.TypeOf((*Animer)(nil)).Elem()
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BounderType = reflect.TypeOf((*Bounder)(nil)).Elem()
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ColliderType = reflect.TypeOf((*Collider)(nil)).Elem()
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DisablerType = reflect.TypeOf((*Disabler)(nil)).Elem()
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DrawerType = reflect.TypeOf((*Drawer)(nil)).Elem()
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HiderType = reflect.TypeOf((*Hider)(nil)).Elem()
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IdentifierType = reflect.TypeOf((*Identifier)(nil)).Elem()
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LoaderType = reflect.TypeOf((*Loader)(nil)).Elem()
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PrepperType = reflect.TypeOf((*Prepper)(nil)).Elem()
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ScannerType = reflect.TypeOf((*Scanner)(nil)).Elem()
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SaverType = reflect.TypeOf((*Saver)(nil)).Elem()
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TransformerType = reflect.TypeOf((*Transformer)(nil)).Elem()
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UpdaterType = reflect.TypeOf((*Updater)(nil)).Elem()
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// Behaviours lists all the behaviours that can be queried with Game.Query.
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Behaviours = []reflect.Type{
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AnimerType,
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BounderType,
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ColliderType,
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DisablerType,
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DrawerType,
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HiderType,
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IdentifierType,
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LoaderType,
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PrepperType,
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ScannerType,
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SaverType,
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TransformerType,
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UpdaterType,
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}
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)
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// Animer components have a current frame index.
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type Animer interface {
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Updater
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CurrentFrame() int
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Reset()
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}
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// Bounder components have a bounding rectangle.
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type Bounder interface {
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BoundingRect() image.Rectangle
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}
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// Collider components have tangible form.
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type Collider interface {
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CollidesWith(image.Rectangle) bool
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}
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// Disabler components can be disabled.
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type Disabler interface {
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IsDisabled() bool
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Disable()
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Enable()
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}
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// Drawer components can draw themselves. Draw is called often. Each component
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// must call Draw on any internal components not known to the engine (i.e. not
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// passed to Game.Register or returned from Scan).
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type Drawer interface {
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Draw(screen *ebiten.Image, opts *ebiten.DrawImageOptions)
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DrawOrder() float64
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}
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// Hider components can be hidden.
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type Hider interface {
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IsHidden() bool
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Hide()
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Show()
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}
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// Identifier components have a sense of self. This makes it easier for
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// components to find and interact with one another.
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type Identifier interface {
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Ident() string
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}
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// Loader components get the chance to load themselves. This happens
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// before preparation.
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type Loader interface {
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Load(fs.FS) error
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}
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// Prepper components can be prepared. It is called after the component
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// database has been populated but before the game is run. The component can
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// store the reference to game, if needed, and also query the component database.
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type Prepper interface {
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Prepare(game *Game) error
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}
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// Scanner components can be scanned. It is called when the game tree is walked
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// (such as when the game component database is constructed).
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// Scan should return a slice containing all immediate subcomponents.
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type Scanner interface {
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Scan() []interface{}
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}
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// Saver components can be saved to disk.
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type Saver interface {
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Save() error
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}
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// Transformer components can transform their child components.
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type Transformer interface {
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Transform() ebiten.DrawImageOptions
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}
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// Updater components can update themselves. Update is called repeatedly. Each
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// component must call Update on any internal components not known to the engine
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// (i.e. not passed to Game.Register or returned from Scan).
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type Updater interface {
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Update() error
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}
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