mirror of https://github.com/gizak/termui.git
73 lines
1.3 KiB
Go
73 lines
1.3 KiB
Go
// Copyright 2015 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
|
|
|
|
/*
|
|
dots:
|
|
,___,
|
|
|1 4|
|
|
|2 5|
|
|
|3 6|
|
|
|7 8|
|
|
`````
|
|
*/
|
|
|
|
var brailleBase = '\u2800'
|
|
|
|
var brailleOftMap = [4][2]rune{
|
|
{'\u0001', '\u0008'},
|
|
{'\u0002', '\u0010'},
|
|
{'\u0004', '\u0020'},
|
|
{'\u0040', '\u0080'}}
|
|
|
|
// Canvas contains drawing map: i,j -> rune
|
|
type Canvas map[[2]int]rune
|
|
|
|
// NewCanvas returns an empty Canvas
|
|
func NewCanvas() Canvas {
|
|
return make(map[[2]int]rune)
|
|
}
|
|
|
|
func chOft(x, y int) rune {
|
|
return brailleOftMap[y%4][x%2]
|
|
}
|
|
|
|
func (c Canvas) rawCh(x, y int) rune {
|
|
if ch, ok := c[[2]int{x, y}]; ok {
|
|
return ch
|
|
}
|
|
return '\u0000' //brailleOffset
|
|
}
|
|
|
|
// return coordinate in terminal
|
|
func chPos(x, y int) (int, int) {
|
|
return y / 4, x / 2
|
|
}
|
|
|
|
// Set sets a point (x,y) in the virtual coordinate
|
|
func (c Canvas) Set(x, y int) {
|
|
i, j := chPos(x, y)
|
|
ch := c.rawCh(i, j)
|
|
ch |= chOft(x, y)
|
|
c[[2]int{i, j}] = ch
|
|
}
|
|
|
|
// Unset removes point (x,y)
|
|
func (c Canvas) Unset(x, y int) {
|
|
i, j := chPos(x, y)
|
|
ch := c.rawCh(i, j)
|
|
ch &= ^chOft(x, y)
|
|
c[[2]int{i, j}] = ch
|
|
}
|
|
|
|
// Buffer returns un-styled points
|
|
func (c Canvas) Buffer() Buffer {
|
|
buf := NewBuffer()
|
|
for k, v := range c {
|
|
buf.Set(k[0], k[1], Cell{Ch: v + brailleBase})
|
|
}
|
|
return buf
|
|
}
|