Add example

example/dashboard.go

@@ -0,0 +1,69 @@
+package main
+
+import ui "github.com/gizak/termui"
+import tm "github.com/nsf/termbox-go"
+import "time"
+
+func main() {
+	err := ui.Init()
+	if err != nil {
+		panic(err)
+	}
+	defer ui.Close()
+
+	p := ui.NewP(":PRESS q TO QUIT DEMO\nThis is an example of termui package rendering.")
+	p.Height = 4
+	p.Width = 59
+	p.TextFgColor = ui.ColorWhite
+	p.Border.Label = "Text"
+	p.Border.FgColor = ui.ColorCyan
+
+	strs := []string{"[0] gizak/termui", "[1] editbox.go", "[2] iterrupt.go", "[3] keyboard.go", "[4] output.go", "[5] random_out.go", "[6] dashboard.go", "[7] nsf/termbox-go"}
+	list := ui.NewList()
+	list.Items = strs
+	list.ItemFgColor = ui.ColorYellow
+	list.Border.Label = "List"
+	list.Height = 7
+	list.Width = 25
+	list.Y = 4
+
+	g := ui.NewGauge()
+	g.Percent = 50
+	g.Width = 52
+	g.Height = 3
+	g.Y = 11
+	g.Border.Label = "Gauge"
+	g.BarColor = ui.ColorRed
+	g.Border.FgColor = ui.ColorWhite
+	g.Border.LabelFgColor = ui.ColorCyan
+
+	draw := func(t int) {
+		g.Percent = t % 101
+		list.Items = strs[t%9:]
+		ui.Render(p, list, g)
+	}
+
+	evt := make(chan tm.Event)
+	go func() {
+		for {
+			evt <- tm.PollEvent()
+		}
+	}()
+
+	i := 0
+	for {
+		select {
+		case e := <-evt:
+			if e.Type == tm.EventKey && e.Ch == 'q' {
+				return
+			}
+		default:
+			draw(i)
+			i++
+			if i == 102 {
+				return
+			}
+			time.Sleep(time.Second / 2)
+		}
+	}
+}

sparkline.go

@@ -0,0 +1,123 @@
+package termui
+
+import "math"
+
+type Sparkline struct {
+	Data          []int
+	Height        int
+	Title         string
+	TitleColor    Attribute
+	LineColor     Attribute
+	displayHeight int
+	scale         float32
+	max           int
+}
+
+type Sparklines struct {
+	Block
+	Lines        []Sparkline
+	displayLines int
+	displayWidth int
+}
+
+var sparks = []rune{'▁', '▂', '▃', '▄', '▅', '▆', '▇', '█'}
+
+func (s *Sparklines) Add(sl Sparkline) {
+	s.Lines = append(s.Lines, sl)
+}
+
+func NewSparklines(ss ...Sparkline) *Sparklines {
+	s := &Sparklines{Block: *NewBlock(), Lines: ss}
+	return s
+}
+
+func (sl *Sparklines) update() {
+	for i, v := range sl.Lines {
+		if v.Title == "" {
+			sl.Lines[i].displayHeight = v.Height
+		} else {
+			sl.Lines[i].displayHeight = v.Height + 1
+		}
+	}
+	sl.displayWidth = sl.innerWidth
+
+	// get how many lines gotta display
+	h := 0
+	for _, v := range sl.Lines {
+		if h+v.displayHeight <= sl.innerHeight {
+			sl.displayLines++
+		} else {
+			break
+		}
+		h += v.displayHeight
+	}
+
+	for i := 0; i < sl.displayLines; i++ {
+		data := sl.Lines[i].Data
+
+		max := math.MinInt32
+		for _, v := range data {
+			if max < v {
+				max = v
+			}
+		}
+		sl.Lines[i].max = max
+		sl.Lines[i].scale = float32(8*sl.Lines[i].Height) / float32(max)
+	}
+}
+
+func (sl *Sparklines) Buffer() []Point {
+	ps := sl.Block.Buffer()
+	sl.update()
+
+	oftY := 0
+	for i := 0; i < sl.displayLines; i++ {
+		l := sl.Lines[i]
+		data := l.Data
+
+		if len(data) > sl.innerWidth {
+			data = data[:sl.innerWidth]
+		}
+
+		if l.Title != "" {
+			rs := trimStr2Runes(l.Title, sl.innerWidth)
+			for oftX, v := range rs {
+				p := Point{}
+				p.Code.Ch = v
+				p.Code.Fg = toTmAttr(l.TitleColor)
+				p.Code.Bg = toTmAttr(sl.BgColor)
+				p.X = oftX
+				p.Y = oftY
+				ps = append(ps, p)
+			}
+		}
+
+		for j, v := range data {
+			h := int(float32(v) * l.scale)
+			barCnt := h / 8
+			barMod := h % 8
+			for jj := 0; jj < barCnt; jj++ {
+				p := Point{}
+				p.X = sl.innerX + j
+				p.Y = sl.innerY + oftY + l.Height - jj
+				p.Code.Ch = sparks[7]
+				p.Code.Fg = toTmAttr(l.LineColor)
+				p.Code.Bg = toTmAttr(sl.BgColor)
+				ps = append(ps, p)
+			}
+			if barMod != 0 {
+				p := Point{}
+				p.X = sl.innerX + j
+				p.Y = sl.innerY + oftY + l.Height - barCnt
+				p.Code.Ch = sparks[barMod-1]
+				p.Code.Fg = toTmAttr(l.LineColor)
+				p.Code.Bg = toTmAttr(sl.BgColor)
+				ps = append(ps, p)
+			}
+		}
+
+		oftY += l.displayHeight
+	}
+
+	return ps
+}