diff options
Diffstat (limited to 'Godeps/_workspace/src/github.com/gizak/termui/buffer.go')
-rw-r--r-- | Godeps/_workspace/src/github.com/gizak/termui/buffer.go | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/Godeps/_workspace/src/github.com/gizak/termui/buffer.go b/Godeps/_workspace/src/github.com/gizak/termui/buffer.go new file mode 100644 index 000000000..60e77863a --- /dev/null +++ b/Godeps/_workspace/src/github.com/gizak/termui/buffer.go @@ -0,0 +1,106 @@ +// Copyright 2016 Zack Guo <gizak@icloud.com>. All rights reserved. +// Use of this source code is governed by a MIT license that can +// be found in the LICENSE file. + +package termui + +import "image" + +// Cell is a rune with assigned Fg and Bg +type Cell struct { + Ch rune + Fg Attribute + Bg Attribute +} + +// Buffer is a renderable rectangle cell data container. +type Buffer struct { + Area image.Rectangle // selected drawing area + CellMap map[image.Point]Cell +} + +// At returns the cell at (x,y). +func (b Buffer) At(x, y int) Cell { + return b.CellMap[image.Pt(x, y)] +} + +// Set assigns a char to (x,y) +func (b Buffer) Set(x, y int, c Cell) { + b.CellMap[image.Pt(x, y)] = c +} + +// Bounds returns the domain for which At can return non-zero color. +func (b Buffer) Bounds() image.Rectangle { + x0, y0, x1, y1 := 0, 0, 0, 0 + for p := range b.CellMap { + if p.X > x1 { + x1 = p.X + } + if p.X < x0 { + x0 = p.X + } + if p.Y > y1 { + y1 = p.Y + } + if p.Y < y0 { + y0 = p.Y + } + } + return image.Rect(x0, y0, x1, y1) +} + +// SetArea assigns a new rect area to Buffer b. +func (b *Buffer) SetArea(r image.Rectangle) { + b.Area.Max = r.Max + b.Area.Min = r.Min +} + +// Sync sets drawing area to the buffer's bound +func (b Buffer) Sync() { + b.SetArea(b.Bounds()) +} + +// NewCell returns a new cell +func NewCell(ch rune, fg, bg Attribute) Cell { + return Cell{ch, fg, bg} +} + +// Merge merges bs Buffers onto b +func (b *Buffer) Merge(bs ...Buffer) { + for _, buf := range bs { + for p, v := range buf.CellMap { + b.Set(p.X, p.Y, v) + } + b.SetArea(b.Area.Union(buf.Area)) + } +} + +// NewBuffer returns a new Buffer +func NewBuffer() Buffer { + return Buffer{ + CellMap: make(map[image.Point]Cell), + Area: image.Rectangle{}} +} + +// Fill fills the Buffer b with ch,fg and bg. +func (b Buffer) Fill(ch rune, fg, bg Attribute) { + for x := b.Area.Min.X; x < b.Area.Max.X; x++ { + for y := b.Area.Min.Y; y < b.Area.Max.Y; y++ { + b.Set(x, y, Cell{ch, fg, bg}) + } + } +} + +// NewFilledBuffer returns a new Buffer filled with ch, fb and bg. +func NewFilledBuffer(x0, y0, x1, y1 int, ch rune, fg, bg Attribute) Buffer { + buf := NewBuffer() + buf.Area.Min = image.Pt(x0, y0) + buf.Area.Max = image.Pt(x1, y1) + + for x := buf.Area.Min.X; x < buf.Area.Max.X; x++ { + for y := buf.Area.Min.Y; y < buf.Area.Max.Y; y++ { + buf.Set(x, y, Cell{ch, fg, bg}) + } + } + return buf +} |