96 lines
2.0 KiB
Go
96 lines
2.0 KiB
Go
package screens
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import (
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"image/color"
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"time"
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"github.com/hajimehoshi/ebiten/v2"
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"github.com/hajimehoshi/ebiten/v2/inpututil"
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"github.com/hajimehoshi/ebiten/v2/text/v2"
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"golang.org/x/image/font/basicfont"
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)
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var (
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basicFace = text.NewGoXFace(basicfont.Face7x13)
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basicFaceAscent = basicFace.Metrics().HAscent
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)
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// Timing
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const (
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splashDuration = 2 * time.Second
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fadeInDuration = 500 * time.Millisecond
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fadeOutDuration = 500 * time.Millisecond
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)
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type SplashScreen struct {
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startTime time.Time
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fadeInEnd time.Time
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fadeOutStart time.Time
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endTime time.Time
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}
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func NewSplashScreen() *SplashScreen {
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now := time.Now()
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return &SplashScreen{
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startTime: now,
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fadeInEnd: now.Add(fadeInDuration),
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fadeOutStart: now.Add(splashDuration - fadeOutDuration),
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endTime: now.Add(splashDuration),
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}
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}
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func (s *SplashScreen) Update() bool {
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if time.Now().After(s.endTime) {
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return true
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}
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if inpututil.IsKeyJustPressed(ebiten.KeySpace) ||
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inpututil.IsKeyJustPressed(ebiten.KeyEnter) ||
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inpututil.IsKeyJustPressed(ebiten.KeyEscape) {
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return true
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}
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return false
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}
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// Rendering
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func (s *SplashScreen) Draw(screen *ebiten.Image, screenWidth, screenHeight int) {
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screen.Fill(color.RGBA{R: 0, G: 0, B: 0, A: 255})
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now := time.Now()
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alpha := 1.0
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if now.Before(s.fadeInEnd) {
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elapsed := now.Sub(s.startTime)
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alpha = float64(elapsed) / float64(fadeInDuration)
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} else if now.After(s.fadeOutStart) {
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elapsed := now.Sub(s.fadeOutStart)
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alpha = 1.0 - (float64(elapsed) / float64(fadeOutDuration))
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}
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if alpha < 0 {
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alpha = 0
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} else if alpha > 1 {
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alpha = 1
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}
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// Draw title
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titleText := "LIL GUY"
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scale := 4.0
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charWidth := 7.0 * scale
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textWidth := float64(len(titleText)) * charWidth
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x := float64(screenWidth)/2 - textWidth/2
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y := float64(screenHeight) / 2
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op := &text.DrawOptions{}
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op.GeoM.Scale(scale, scale)
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op.GeoM.Translate(x, y-basicFaceAscent*scale)
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op.ColorScale.ScaleWithColor(color.White)
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op.ColorScale.ScaleAlpha(float32(alpha))
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text.Draw(screen, titleText, basicFace, op)
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}
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