107 lines
2.0 KiB
Go
107 lines
2.0 KiB
Go
package groovy
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import (
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"os"
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"github.com/hajimehoshi/ebiten/v2"
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)
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const (
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defaultWidth = 1024
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defaultHeight = 768
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)
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type Area struct {
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Width int
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Height int
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}
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type GameInfo struct {
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Name string
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Version string
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Dimension Area
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}
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type Manager struct {
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Info GameInfo
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currentScene Scene
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currentSceneId int
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scenes []Scene
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}
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// can be used to create default manager instance
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func NewManager() Manager {
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return Manager{
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Info: GameInfo{
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Name: "groovy",
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Version: "1.0",
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Dimension: Area{
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Width: defaultWidth,
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Height: defaultHeight},
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},
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currentSceneId: 0,
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}
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}
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// ebitengine update proxy
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// manages scene transition and exists, then calls scene's update method
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func (m *Manager) Update() error {
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if m.currentScene == nil {
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return nil
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}
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m.CheckTransitions()
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m.CheckExit()
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//call the current scene's update method
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return m.currentScene.Update()
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}
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// check for exit condition
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func (m *Manager) CheckExit() {
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if m.currentSceneId >= len(m.scenes) {
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os.Exit(0)
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}
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}
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// check for scene completion and if reached, set up next scene (if available)
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func (m *Manager) CheckTransitions() {
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if m.currentScene.Completed() {
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m.currentSceneId++
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if m.currentSceneId < len(m.scenes) {
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m.currentScene = m.scenes[m.currentSceneId]
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}
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}
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}
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// calls current scene's draw method if the currentscene is valid
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func (m *Manager) Draw(screen *ebiten.Image) {
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if m.currentScene != nil {
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m.currentScene.Draw(screen)
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}
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}
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// ebitengine proxy for layout
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func (m *Manager) Layout(outsideWidth, outsideHeight int) (screenWidth, screenHeight int) {
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return m.Info.Dimension.Width, m.Info.Dimension.Height
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}
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// appends scene to the managed scenes
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func (m *Manager) AddScene(s Scene) {
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m.scenes = append(m.scenes, s)
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}
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// sets the current scene, based on sceneindex
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func (m *Manager) SetCurrentScene(sceneId int) {
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if sceneId >= 0 && sceneId < len(m.scenes) {
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m.currentSceneId = sceneId
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m.currentScene = m.scenes[m.currentSceneId]
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}
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}
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// check for exit condition
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func (m *Manager) SetDimensions(a Area) {
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m.Info.Dimension = a
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}
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