Is there any way to get the time that every frame taken

[BlockyDeer]

Is there any way to get the time that every frame taken? I have read the code but I cannot find anything about that. It's just like deltatime in Unity Engine or some other game engine. I want my animation played at the same speed.

[meowgorithm]

Hi!

To step animations at say, 60fps you can use the Every command. You can get the time delta by comparing timestamps between messages.

type StepAnimMsg time.Time

// Step the animation every 1/60th of a second.
func stepAnim() Cmd {
    return Every(time.Second/60, func(t time.Time) Msg {
        return StepAnimMsg(t)
    })
}

func (m model) Init() Cmd {
    // Start ticking.
    return stepAnim()
}

func (m model) Update(msg Msg) (Model, Cmd) {
    switch msg.(type) {
    case StepAnimMsg:
        now := time.Now()
        delta := m.lastStep.Since(now) // here's the time delta
        m.lastStep = now
        return m, stepAnim() // return your Every command again to loop.
    }
    return m, nil
}

The nice thing about Every is that all your animations will step at the same interval thanks to the nuances of the Bubble Tea runtime.

If you're interested in either springs or particles the Harmonica library works great in terminals and also supports a notion of a time delta.

There are also a couple of Haramonica/Bubble Tea examples that should help you wrap your head around animations in Bubble Tea in general:

• Simple spring animation
• Cellbuffer-based example (click around with the mouse)

Let us know if you still have questions.

---

Side note: the default max FPS is 60. You can change it with WithFPS. So if you wanted a deltatime of ~17ms you could set an FPS of 60 (which is actually the default). Note that WithFPS is currently on master and not in a release yet so you'll need to go get github.com/charmbracelet/bubbletea@master. Also note that the max FPS is capped at 120.