107 lines
2.3 KiB
Go
107 lines
2.3 KiB
Go
// Copyright 2017 Zack Guo <zack.y.guo@gmail.com>. All rights reserved.
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// Use of this source code is governed by a MIT license that can
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// be found in the LICENSE file.
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package termui
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import "image"
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// Cell is a rune with assigned Fg and Bg
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type Cell struct {
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Ch rune
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Fg Attribute
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Bg Attribute
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}
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// Buffer is a renderable rectangle cell data container.
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type Buffer struct {
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Area image.Rectangle // selected drawing area
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CellMap map[image.Point]Cell
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}
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// At returns the cell at (x,y).
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func (b Buffer) At(x, y int) Cell {
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return b.CellMap[image.Pt(x, y)]
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}
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// Set assigns a char to (x,y)
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func (b Buffer) Set(x, y int, c Cell) {
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b.CellMap[image.Pt(x, y)] = c
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}
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// Bounds returns the domain for which At can return non-zero color.
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func (b Buffer) Bounds() image.Rectangle {
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x0, y0, x1, y1 := 0, 0, 0, 0
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for p := range b.CellMap {
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if p.X > x1 {
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x1 = p.X
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}
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if p.X < x0 {
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x0 = p.X
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}
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if p.Y > y1 {
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y1 = p.Y
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}
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if p.Y < y0 {
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y0 = p.Y
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}
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}
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return image.Rect(x0, y0, x1+1, y1+1)
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}
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// SetArea assigns a new rect area to Buffer b.
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func (b *Buffer) SetArea(r image.Rectangle) {
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b.Area.Max = r.Max
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b.Area.Min = r.Min
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}
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// Sync sets drawing area to the buffer's bound
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func (b *Buffer) Sync() {
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b.SetArea(b.Bounds())
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}
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// NewCell returns a new cell
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func NewCell(ch rune, fg, bg Attribute) Cell {
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return Cell{ch, fg, bg}
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}
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// Merge merges bs Buffers onto b
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func (b *Buffer) Merge(bs ...Buffer) {
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for _, buf := range bs {
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for p, v := range buf.CellMap {
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b.Set(p.X, p.Y, v)
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}
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b.SetArea(b.Area.Union(buf.Area))
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}
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}
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// NewBuffer returns a new Buffer
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func NewBuffer() Buffer {
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return Buffer{
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CellMap: make(map[image.Point]Cell),
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Area: image.Rectangle{}}
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}
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// Fill fills the Buffer b with ch,fg and bg.
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func (b Buffer) Fill(ch rune, fg, bg Attribute) {
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for x := b.Area.Min.X; x < b.Area.Max.X; x++ {
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for y := b.Area.Min.Y; y < b.Area.Max.Y; y++ {
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b.Set(x, y, Cell{ch, fg, bg})
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}
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}
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}
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// NewFilledBuffer returns a new Buffer filled with ch, fb and bg.
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func NewFilledBuffer(x0, y0, x1, y1 int, ch rune, fg, bg Attribute) Buffer {
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buf := NewBuffer()
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buf.Area.Min = image.Pt(x0, y0)
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buf.Area.Max = image.Pt(x1, y1)
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for x := buf.Area.Min.X; x < buf.Area.Max.X; x++ {
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for y := buf.Area.Min.Y; y < buf.Area.Max.Y; y++ {
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buf.Set(x, y, Cell{ch, fg, bg})
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}
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}
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return buf
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}
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