From 70bd0b02f34e8e746d3b3936054421390b83f9aa Mon Sep 17 00:00:00 2001
From: Zack Guo <Gizak@Zacks-MacBook-Pro.local>
Date: Tue, 3 Feb 2015 09:07:31 -0500
Subject: [PATCH] Renderer interface

---
 box.go    | 98 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 point.go  |  9 +++++
 render.go | 23 +++++++++++++
 3 files changed, 130 insertions(+)
 create mode 100644 box.go
 create mode 100644 point.go
 create mode 100644 render.go

diff --git a/box.go b/box.go
new file mode 100644
index 0000000..a9274b8
--- /dev/null
+++ b/box.go
@@ -0,0 +1,98 @@
+package termui
+
+import tm "github.com/nsf/termbox-go"
+
+const TOP_RIGHT = '┐'
+const VERTICAL_LINE = '│'
+const HORIZONTAL_LINE = '─'
+const TOP_LEFT = '┌'
+const BOTTOM_RIGHT = '┘'
+const BOTTOM_LEFT = '└'
+
+type Box struct {
+	X int
+	Y int
+	Width int
+	Height int
+	Border bool
+	FgColor tm.Attribute
+	BgColor tm.Attribute
+}
+
+type HLine struct {
+	X int
+	Y int
+	Length int
+	FgColor tm.Attribute
+	BgColor tm.Attribute
+}
+
+type VLine struct {
+	X int
+	Y int
+	Length int
+	FgColor tm.Attribute
+	BgColor tm.Attribute
+}
+
+func (l HLine) Buffer() []Point{
+	pts := make([]Point,l.Length)
+	for i:=0;i<l.Length;i++{
+		pts[i].X = l.X+i
+		pts[i].Y = l.Y
+		pts[i].Code.Ch = HORIZONTAL_LINE
+		pts[i].Code.Bg = l.BgColor
+		pts[i].Code.Fg = l.FgColor
+	}
+	return pts
+}
+
+func (l VLine) Buffer() []Point{
+	pts := make([]Point,l.Length)
+	for i:=0;i<l.Length;i++{
+		pts[i].X = l.X
+		pts[i].Y = l.Y+i
+		pts[i].Code.Ch = VERTICAL_LINE
+		pts[i].Code.Bg = l.BgColor
+		pts[i].Code.Fg = l.FgColor
+	}
+	return pts
+}
+
+func (b Box) Buffer() []Point{
+	if b.Width<2 || b.Height<2 {
+		return nil
+	}
+	pts := make([]Point,2*b.Width+2*b.Height-4)
+
+	pts[0].X = b.X
+	pts[0].Y = b.Y
+	pts[0].Code.Fg = b.FgColor
+	pts[0].Code.Bg = b.BgColor
+	pts[0].Code.Ch = TOP_LEFT
+
+	pts[1].X = b.X+b.Width-1
+	pts[1].Y = b.Y
+	pts[1].Code.Fg = b.FgColor
+	pts[1].Code.Bg = b.BgColor
+	pts[1].Code.Ch = TOP_RIGHT
+
+	pts[2].X = b.X
+	pts[2].Y = b.Y+b.Height-1
+	pts[2].Code.Fg = b.FgColor
+	pts[2].Code.Bg = b.BgColor
+	pts[2].Code.Ch = BOTTOM_LEFT
+
+	pts[3].X = b.X+b.Width-1
+	pts[3].Y = b.Y+b.Height-1
+	pts[3].Code.Fg = b.FgColor
+	pts[3].Code.Bg = b.BgColor
+	pts[3].Code.Ch = BOTTOM_RIGHT
+
+	copy(pts[4:],(HLine{b.X+1,b.Y,b.Width-2,b.FgColor,b.BgColor}).Buffer())
+	copy(pts[4+b.Width-2:],(HLine{b.X+1,b.Y+b.Height-1,b.Width-2,b.FgColor,b.BgColor}).Buffer())
+	copy(pts[4+2*b.Width-4:],(VLine{b.X,b.Y+1,b.Height-2,b.FgColor,b.BgColor}).Buffer())
+	copy(pts[4+2*b.Width-4+b.Height-2:],(VLine{b.X+b.Width-1,b.Y+1,b.Height-2,b.FgColor,b.BgColor}).Buffer())
+	
+	return pts
+}
diff --git a/point.go b/point.go
new file mode 100644
index 0000000..e3619b8
--- /dev/null
+++ b/point.go
@@ -0,0 +1,9 @@
+package termui
+
+import tm "github.com/nsf/termbox-go"
+
+type Point struct {
+	Code tm.Cell
+	X int
+	Y int
+}
diff --git a/render.go b/render.go
new file mode 100644
index 0000000..1ca1d38
--- /dev/null
+++ b/render.go
@@ -0,0 +1,23 @@
+package termui
+
+import tm "github.com/nsf/termbox-go"
+
+type Renderer interface {
+	Buffer() []Point
+}
+
+func Init() error {
+	return tm.Init()
+}
+
+func Close(){
+	tm.Close()
+}
+
+func Render(r Renderer) {
+	buf := r.Buffer()
+	for _,v := range buf {
+		tm.SetCell(v.X,v.Y,v.Code.Ch,v.Code.Fg,v.Code.Bg)
+	}
+	tm.Flush()
+}