mirror of https://github.com/gizak/termui.git
73 lines
1.3 KiB
Go
73 lines
1.3 KiB
Go
// Copyright 2016 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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/*
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dots:
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,___,
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|1 4|
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|2 5|
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|3 6|
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|7 8|
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`````
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*/
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var brailleBase = '\u2800'
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var brailleOftMap = [4][2]rune{
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{'\u0001', '\u0008'},
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{'\u0002', '\u0010'},
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{'\u0004', '\u0020'},
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{'\u0040', '\u0080'}}
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// Canvas contains drawing map: i,j -> rune
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type Canvas map[[2]int]rune
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// NewCanvas returns an empty Canvas
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func NewCanvas() Canvas {
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return make(map[[2]int]rune)
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}
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func chOft(x, y int) rune {
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return brailleOftMap[y%4][x%2]
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}
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func (c Canvas) rawCh(x, y int) rune {
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if ch, ok := c[[2]int{x, y}]; ok {
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return ch
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}
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return '\u0000' //brailleOffset
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}
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// return coordinate in terminal
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func chPos(x, y int) (int, int) {
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return y / 4, x / 2
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}
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// Set sets a point (x,y) in the virtual coordinate
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func (c Canvas) Set(x, y int) {
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i, j := chPos(x, y)
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ch := c.rawCh(i, j)
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ch |= chOft(x, y)
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c[[2]int{i, j}] = ch
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}
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// Unset removes point (x,y)
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func (c Canvas) Unset(x, y int) {
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i, j := chPos(x, y)
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ch := c.rawCh(i, j)
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ch &= ^chOft(x, y)
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c[[2]int{i, j}] = ch
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}
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// Buffer returns un-styled points
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func (c Canvas) Buffer() Buffer {
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buf := NewBuffer()
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for k, v := range c {
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buf.Set(k[0], k[1], Cell{Ch: v + brailleBase})
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}
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return buf
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}
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