func update(screen *ebiten.Image) error {
if ebiten.IsKeyPressed(ebiten.KeyLeft) {
sprites.num -= 20
if sprites.num < MinSprites {
sprites.num = MinSprites
}
}
if ebiten.IsKeyPressed(ebiten.KeyRight) {
sprites.num += 20
if MaxSprites < sprites.num {
sprites.num = MaxSprites
}
}
sprites.Update()
if ebiten.IsRunningSlowly() {
return nil
}
op := &ebiten.DrawImageOptions{
ImageParts: sprites,
}
op.ColorM.Scale(1.0, 1.0, 1.0, 0.5)
if err := screen.DrawImage(ebitenImage, op); err != nil {
return err
}
msg := fmt.Sprintf(`FPS: %0.2f
Num of sprites: %d
Press <- or -> to change the number of sprites`, ebiten.CurrentFPS(), sprites.Len())
if err := ebitenutil.DebugPrint(screen, msg); err != nil {
return err
}
return nil
}
func update(screen *ebiten.Image) error {
if err := game.Update(); err != nil {
return err
}
if ebiten.IsRunningSlowly() {
return nil
}
if err := game.Draw(screen); err != nil {
return err
}
return nil
}
func (game *Game) Update(r *ebiten.Image) error {
game.input.Update()
if err := game.sceneManager.Update(&GameState{
SceneManager: game.sceneManager,
Input: &game.input,
}); err != nil {
return err
}
if !ebiten.IsRunningSlowly() {
if err := game.sceneManager.Draw(r); err != nil {
return err
}
}
return nil
}