diff --git a/examples/bubbletea/main.go b/examples/bubbletea/main.go new file mode 100644 index 0000000..8c0d19e --- /dev/null +++ b/examples/bubbletea/main.go @@ -0,0 +1,104 @@ +package main + +import ( + "fmt" + "math" + "os" + "strings" + "time" + + tea "github.com/charmbracelet/bubbletea" + "github.com/charmbracelet/harmonica" + "github.com/charmbracelet/lipgloss" +) + +const ( + fps = time.Second / 60 + spriteWidth = 12 + spriteHeight = 5 + frequency = 0.95 + damping = 0.98 +) + +var ( + helpStyle = lipgloss.NewStyle(). + Foreground(lipgloss.AdaptiveColor{Light: "246", Dark: "241"}). + MarginTop(1). + MarginLeft(2) + + spriteStyle = lipgloss.NewStyle(). + Foreground(lipgloss.Color("229")). + Background(lipgloss.Color("69")) +) + +type frameMsg time.Time + +func animate() tea.Cmd { + return tea.Tick(fps, func(t time.Time) tea.Msg { + return frameMsg(t) + }) +} + +type model struct { + x float64 + xVel float64 + spring harmonica.Spring +} + +func (_ model) Init() tea.Cmd { + return animate() +} + +func (m model) Update(msg tea.Msg) (tea.Model, tea.Cmd) { + switch msg.(type) { + case tea.KeyMsg: + return m, tea.Quit + + // Step foreward one frame + case frameMsg: + const targetX = 60 + + // Update x position (and velocity) with our spring. + m.spring.Update(&m.x, &m.xVel, targetX) + + // Quit when we're basically at the target position. + if math.Abs(m.x-targetX) < 0.01 { + return m, tea.Quit + } + + // Request next frame + return m, animate() + + default: + return m, nil + } +} + +func (m model) View() string { + var out strings.Builder + fmt.Fprint(&out, "\n") + + x := int(math.Round(m.x)) + if x < 0 { + return "" + } + + spriteRow := spriteStyle.Render(strings.Repeat("/", spriteWidth)) + row := strings.Repeat(" ", x) + spriteRow + "\n" + fmt.Fprint(&out, strings.Repeat(row, spriteHeight)) + + fmt.Fprint(&out, helpStyle.Render("Press any key to quit")) + + return out.String() +} + +func main() { + m := model{ + spring: harmonica.NewSpring(harmonica.TimeDelta(fps), frequency, damping), + } + + if err := tea.NewProgram(m).Start(); err != nil { + fmt.Println("Error running program:", err) + os.Exit(1) + } +} diff --git a/examples/go.mod b/examples/go.mod index f408763..e91bb64 100644 --- a/examples/go.mod +++ b/examples/go.mod @@ -5,7 +5,12 @@ go 1.16 replace github.com/charmbracelet/harmonica => ../ require ( + github.com/charmbracelet/bubbletea v0.14.1 // indirect github.com/charmbracelet/harmonica v0.0.0-20210709144143-16876a63b30d // indirect + github.com/charmbracelet/lipgloss v0.3.0 // indirect + github.com/google/goterm v0.0.0-20190703233501-fc88cf888a3f // indirect github.com/h8gi/canvas v0.0.0-20200710004640-a6361a06ab49 + github.com/pkg/term v0.0.0-20200520122047-c3ffed290a03 // indirect + golang.org/x/crypto v0.0.0-20201012173705-84dcc777aaee // indirect golang.org/x/image v0.0.0-20190523035834-f03afa92d3ff ) diff --git a/examples/go.sum b/examples/go.sum index 62fd2f4..38b9e3a 100644 --- a/examples/go.sum +++ b/examples/go.sum @@ -1,3 +1,9 @@ +github.com/charmbracelet/bubbletea v0.14.1 h1:pD/bM5LBEH/nDo7nKcgNUgi4uRHQhpWTIHZbG5vuSlc= +github.com/charmbracelet/bubbletea v0.14.1/go.mod h1:b5lOf5mLjMg1tRn1HVla54guZB+jvsyV0yYAQja95zE= +github.com/charmbracelet/lipgloss v0.3.0 h1:5MysOD6sHr4RP4jkZNWGVIul5GKoOsP12NgbgXPvAlA= +github.com/charmbracelet/lipgloss v0.3.0/go.mod h1:VkhdBS2eNAmRkTwRKLJCFhCOVkjntMusBDxv7TXahuk= +github.com/containerd/console v1.0.1 h1:u7SFAJyRqWcG6ogaMAx3KjSTy1e3hT9QxqX7Jco7dRc= +github.com/containerd/console v1.0.1/go.mod h1:XUsP6YE/mKtz6bxc+I8UiKKTP04qjQL4qcS3XoQ5xkw= github.com/faiface/glhf v0.0.0-20181018222622-82a6317ac380 h1:FvZ0mIGh6b3kOITxUnxS3tLZMh7yEoHo75v3/AgUqg0= github.com/faiface/glhf v0.0.0-20181018222622-82a6317ac380/go.mod h1:zqnPFFIuYFFxl7uH2gYByJwIVKG7fRqlqQCbzAnHs9g= github.com/faiface/mainthread v0.0.0-20171120011319-8b78f0a41ae3 h1:baVdMKlASEHrj19iqjARrPbaRisD7EuZEVJj6ZMLl1Q= @@ -14,11 +20,43 @@ github.com/go-gl/mathgl v0.0.0-20190416160123-c4601bc793c7 h1:THttjeRn1iiz69E875 github.com/go-gl/mathgl v0.0.0-20190416160123-c4601bc793c7/go.mod h1:yhpkQzEiH9yPyxDUGzkmgScbaBVlhC06qodikEM0ZwQ= github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0 h1:DACJavvAHhabrF08vX0COfcOBJRhZ8lUbR+ZWIs0Y5g= github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0/go.mod h1:E/TSTwGwJL78qG/PmXZO1EjYhfJinVAhrmmHX6Z8B9k= +github.com/google/goterm v0.0.0-20190703233501-fc88cf888a3f/go.mod h1:nOFQdrUlIlx6M6ODdSpBj1NVA+VgLC6kmw60mkw34H4= github.com/h8gi/canvas v0.0.0-20200710004640-a6361a06ab49 h1:svddC2dRqy+Y1zGH4+AvvCFZLKuPhAfEvlgYSNP4lcg= github.com/h8gi/canvas v0.0.0-20200710004640-a6361a06ab49/go.mod h1:7iSUKfOcA+GiWc+LpxXggMogUFIo8pm1FZcYTUmL3YY= +github.com/lucasb-eyer/go-colorful v1.2.0 h1:1nnpGOrhyZZuNyfu1QjKiUICQ74+3FNCN69Aj6K7nkY= +github.com/lucasb-eyer/go-colorful v1.2.0/go.mod h1:R4dSotOR9KMtayYi1e77YzuveK+i7ruzyGqttikkLy0= +github.com/mattn/go-isatty v0.0.12 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