Add grid layout

example/grid.go

@@ -0,0 +1,86 @@
+package main
+
+import ui "github.com/gizak/termui"
+import tm "github.com/nsf/termbox-go"
+import "math"
+
+import "time"
+
+func main() {
+	err := ui.Init()
+	if err != nil {
+		panic(err)
+	}
+	defer ui.Close()
+
+	sinps := (func() []float64 {
+		n := 400
+		ps := make([]float64, n)
+		for i := range ps {
+			ps[i] = 1 + math.Sin(float64(i)/5)
+		}
+		return ps
+	})()
+	sinpsint := (func() []int {
+		ps := make([]int, len(sinps))
+		for i, v := range sinps {
+			ps[i] = int(100*v + 10)
+		}
+		return ps
+	})()
+
+	ui.UseTheme("helloworld")
+
+	spark := ui.Sparkline{}
+	spark.Height = 8
+	spdata := sinpsint
+	spark.Data = spdata
+	spark.LineColor = ui.ColorCyan
+	spark.TitleColor = ui.ColorWhite
+
+	sp := ui.NewSparklines(spark)
+	sp.Height = 11
+	sp.Border.Label = "Sparkline"
+
+	lc := ui.NewLineChart()
+	lc.Border.Label = "braille-mode Line Chart"
+	lc.Data = sinps
+	lc.Height = 11
+	lc.AxesColor = ui.ColorWhite
+	lc.LineColor = ui.ColorYellow | ui.AttrBold
+
+	ui.Body.Rows = []ui.Row{
+		ui.NewRow(
+			ui.NewCol(sp, 6, 0, true),
+			ui.NewCol(lc, 6, 0, true))}
+
+	draw := func(t int) {
+		sp.Lines[0].Data = spdata[t:]
+		lc.Data = sinps[2*t:]
+		ui.Render(ui.Body)
+	}
+
+	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)
+		}
+	}
+}