openquell/components/timer.go

package components

import (
	"math/rand"
	"time"

	"github.com/hajimehoshi/ebiten/v2"
)

type Timer struct {
	CurrentTicks int
	TargetTicks  int
	Running      bool
	Id           int
}

func NewTimer() *Timer {
	return &Timer{}
}

func (timer *Timer) Start(duration time.Duration) {
	timer.Reset()

	min := int(1000 / ebiten.TPS()) // 16.66ms == 1 tick

	dur := duration
	if int(duration.Milliseconds()) < min {
		dur = time.Duration(1000/ebiten.TPS()) * time.Millisecond
	}

	timer.TargetTicks = int(dur.Milliseconds()) / min // id d=50, then 50 / 16.6 =
	timer.Running = true
	timer.Id = rand.Int()
}

func (timer *Timer) Update() {
	if (timer.CurrentTicks < timer.TargetTicks) && timer.Running {
		timer.CurrentTicks++
	}
}

func (timer *Timer) IsReady() bool {
	return (timer.CurrentTicks >= timer.TargetTicks) && timer.Running
}

func (timer *Timer) Reset() {
	timer.CurrentTicks = 0
	timer.TargetTicks = 0
	timer.Running = false
}