mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-09-20 05:12:18 +02:00
90 lines
1.9 KiB
Go
90 lines
1.9 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/v2"
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)
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var (
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transitionFrom = ebiten.NewImage(ScreenWidth, ScreenHeight)
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transitionTo = ebiten.NewImage(ScreenWidth, ScreenHeight)
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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)
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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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type GameState struct {
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SceneManager *SceneManager
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Input *Input
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}
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func (s *SceneManager) Update(input *Input) error {
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if s.transitionCount == 0 {
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return s.current.Update(&GameState{
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SceneManager: s,
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Input: input,
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})
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}
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s.transitionCount--
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if s.transitionCount > 0 {
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return nil
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}
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s.current = s.next
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s.next = nil
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return nil
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}
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func (s *SceneManager) Draw(r *ebiten.Image) {
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if s.transitionCount == 0 {
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s.current.Draw(r)
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return
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}
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transitionFrom.Clear()
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s.current.Draw(transitionFrom)
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transitionTo.Clear()
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s.next.Draw(transitionTo)
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r.DrawImage(transitionFrom, nil)
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alpha := 1 - float32(s.transitionCount)/float32(transitionMaxCount)
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op := &ebiten.DrawImageOptions{}
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op.ColorScale.ScaleAlpha(alpha)
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r.DrawImage(transitionTo, op)
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}
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func (s *SceneManager) GoTo(scene Scene) {
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if s.current == nil {
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s.current = scene
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} else {
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s.next = scene
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s.transitionCount = transitionMaxCount
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}
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}
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