Update README

README.md

@@ -1,2 +1,62 @@
 # termui
-Go terminal rich user interface
+Go terminal dashboard, inspired by [blessed-contrib](https://github.com/yaronn/blessed-contrib), but purely in Go.
+
+Cross-platform, easy to compile, and fully-customizable.
+
+__Demo:__
+
+<img src="https://github.com/gizak/termui/tree/master/example/screencast.gif" alt="demo" width="800">
+
+## Installation
+
+	go get github.com/gizak/termui
+
+## Usage
+
+Each component's layout is a bit like HTML block, which has border and padding. The `Border` property can be chosen to hide or display (with its border label), when it comes to display, in this case the space it takes is counted as padding space (i.e. `PaddingTop=PaddingBottom=PaddingLeft=PaddingRight=1`).
+
+`````go
+	import ui "github.com/gizak/termui" // <- ui shortcut, optional
+
+	func main() {
+		err := ui.Init()
+		if err != nil {
+			panic(err)
+		}
+		defer ui.Close()
+
+		p := ui.NewP(":PRESS q TO QUIT DEMO")
+		p.Height = 3
+		p.Width = 50
+		p.TextFgColor = ui.ColorWhite
+		p.Border.Label = "Text Box"
+		p.Border.FgColor = ui.ColorCyan
+
+		g := ui.NewGauge()
+		g.Percent = 50
+		g.Width = 50
+		g.Height = 3
+		g.Y = 11
+		g.Border.Label = "Gauge"
+		g.BarColor = ui.ColorRed
+		g.Border.FgColor = ui.ColorWhite
+		g.Border.LabelFgColor = ui.ColorCyan
+
+		ui.Render(p, g)
+
+		// event handler...
+	}
+`````
+
+Note that components can be overlapped (I'd rather call this as a feature...), `Render(Renderer...)` renders its args from left to right (i.e. each component's weight is arising from left to right).
+
+## Widgets
+
+_APIs are subject to change, docs will be added after 2 or 3 commits_
+
+## GoDoc
+
+[godoc](https://godoc.org/github.com/gizak/termui).
+
+## License
+This library is under the [MIT License](http://opensource.org/licenses/MIT)

chart.go

@@ -266,6 +266,9 @@ func (lc *LineChart) plotAxes() []Point {
 
 func (lc *LineChart) Buffer() []Point {
 	ps := lc.Block.Buffer()
+	if lc.Data == nil || len(lc.Data) == 0 {
+		return ps
+	}
 	lc.calcLayout()
 	ps = append(ps, lc.plotAxes()...)