96 lines
2.1 KiB
Go
96 lines
2.1 KiB
Go
package engine
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import (
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"encoding/gob"
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"github.com/hajimehoshi/ebiten/v2"
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)
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func init() {
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gob.Register(Game{})
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}
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// Game implements the ebiten methods using a collection of components.
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type Game struct {
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ScreenWidth int
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ScreenHeight int
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*Scene
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componentsByID map[string]interface{}
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}
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// Draw draws the entire thing, with no geometric transform.
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func (g *Game) Draw(screen *ebiten.Image) {
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g.Scene.Draw(screen, ebiten.GeoM{})
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}
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// Layout returns the configured screen width/height.
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func (g *Game) Layout(outsideWidth, outsideHeight int) (w, h int) {
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return g.ScreenWidth, g.ScreenHeight
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}
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// RegisterComponent tells the game there is a new component. Currently this is
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// only necessary for components with IDs.
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func (g *Game) RegisterComponent(c interface{}) {
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i, ok := c.(Identifier)
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if !ok {
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return
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}
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id := i.Ident()
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if id == "" {
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return
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}
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g.componentsByID[id] = c
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}
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// UnregisterComponent tells the game the component is no more.
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func (g *Game) UnregisterComponent(c interface{}) {
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i, ok := c.(Identifier)
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if !ok {
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return
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}
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id := i.Ident()
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if id == "" {
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return
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}
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delete(g.componentsByID, id)
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}
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// Component returns the component with a given ID, or nil if there is none.
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func (g *Game) Component(id string) interface{} { return g.componentsByID[id] }
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// Scan implements Scanner.
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func (g *Game) Scan() []interface{} { return []interface{}{g.Scene} }
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// Walk calls v with every component reachable from c via Scan, recursively,
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// for as long as visit returns true.
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func Walk(c interface{}, v func(interface{}) bool) {
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if !v(c) {
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return
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}
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if sc, ok := c.(Scanner); ok {
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for _, c := range sc.Scan() {
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if !v(c) {
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return
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}
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Walk(c, v)
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}
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}
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}
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// PrepareToRun builds the component database (using Walk) and then calls
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// Prepare on every Preparer. You must call PrepareToRun before passing to
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// ebiten.RunGame.
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func (g *Game) PrepareToRun() {
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g.componentsByID = make(map[string]interface{})
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Walk(g, func(c interface{}) bool {
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g.RegisterComponent(c)
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return true
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})
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Walk(g, func(c interface{}) bool {
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if p, ok := c.(Prepper); ok {
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p.Prepare(g)
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}
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return true
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})
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}
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