mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-12-25 19:28:57 +01:00
103 lines
2.3 KiB
Go
103 lines
2.3 KiB
Go
// Copyright 2014 Hajime Hoshi
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package blocks
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import (
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"github.com/hajimehoshi/ebiten"
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)
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var (
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transitionFrom *ebiten.Image
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transitionTo *ebiten.Image
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)
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func init() {
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var err error
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transitionFrom, err = ebiten.NewImage(ScreenWidth, ScreenHeight, ebiten.FilterNearest)
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if err != nil {
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panic(err)
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}
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transitionTo, err = ebiten.NewImage(ScreenWidth, ScreenHeight, ebiten.FilterNearest)
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if err != nil {
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panic(err)
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}
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}
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type Scene interface {
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Update(state *GameState) error
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Draw(screen *ebiten.Image) error
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}
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const transitionMaxCount = 20
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type SceneManager struct {
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current Scene
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next Scene
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transitionCount int
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}
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func NewSceneManager(initScene Scene) *SceneManager {
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return &SceneManager{
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current: initScene,
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transitionCount: -1,
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}
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}
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func (s *SceneManager) Update(state *GameState) error {
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if s.transitionCount == -1 {
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return s.current.Update(state)
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}
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s.transitionCount++
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if transitionMaxCount <= s.transitionCount {
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s.current = s.next
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s.next = nil
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s.transitionCount = -1
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}
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return nil
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}
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func (s *SceneManager) Draw(r *ebiten.Image) error {
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if s.transitionCount == -1 {
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return s.current.Draw(r)
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}
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if err := transitionFrom.Clear(); err != nil {
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return err
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}
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if err := s.current.Draw(transitionFrom); err != nil {
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return err
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}
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if err := transitionTo.Clear(); err != nil {
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return err
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}
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if err := s.next.Draw(transitionTo); err != nil {
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return err
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}
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if err := r.DrawImage(transitionFrom, nil); err != nil {
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return err
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}
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alpha := float64(s.transitionCount) / float64(transitionMaxCount)
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op := &ebiten.DrawImageOptions{}
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op.ColorM.Scale(1, 1, 1, alpha)
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return r.DrawImage(transitionTo, op)
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}
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func (s *SceneManager) GoTo(scene Scene) {
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s.next = scene
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s.transitionCount = 0
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}
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