77 lines
1.5 KiB
Go
77 lines
1.5 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 GPLv3 license that can
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// be found in the LICENSE file.
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package termui
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import (
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"image"
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rw "github.com/mattn/go-runewidth"
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)
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// Cell represents a viewable terminal cell
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type Cell struct {
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Rune rune
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Style Style
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}
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var CellClear = Cell{
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Rune: ' ',
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Style: StyleClear,
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}
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// NewCell takes 1 to 2 arguments
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// 1st argument = rune
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// 2nd argument = optional style
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func NewCell(rune rune, args ...interface{}) Cell {
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style := StyleClear
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if len(args) == 1 {
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style = args[0].(Style)
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}
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return Cell{
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Rune: rune,
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Style: style,
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}
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}
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// Buffer represents a section of a terminal and is a renderable rectangle of cells.
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type Buffer struct {
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image.Rectangle
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CellMap map[image.Point]Cell
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}
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func NewBuffer(r image.Rectangle) *Buffer {
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buf := &Buffer{
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Rectangle: r,
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CellMap: make(map[image.Point]Cell),
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}
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buf.Fill(CellClear, r) // clears out area
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return buf
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}
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func (self *Buffer) GetCell(p image.Point) Cell {
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return self.CellMap[p]
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}
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func (self *Buffer) SetCell(c Cell, p image.Point) {
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self.CellMap[p] = c
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}
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func (self *Buffer) Fill(c Cell, rect image.Rectangle) {
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for x := rect.Min.X; x < rect.Max.X; x++ {
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for y := rect.Min.Y; y < rect.Max.Y; y++ {
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self.SetCell(c, image.Pt(x, y))
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}
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}
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}
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func (self *Buffer) SetString(s string, style Style, p image.Point) {
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runes := []rune(s)
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x := 0
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for _, char := range runes {
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self.SetCell(Cell{char, style}, image.Pt(p.X+x, p.Y))
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x += rw.RuneWidth(char)
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}
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}
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