Add braille canvas

This commit is contained in:
gizak 2015-03-26 18:11:41 -04:00
parent b436024302
commit 2d8fd3efda
2 changed files with 129 additions and 0 deletions

74
canvas.go Normal file
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// 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() []Point {
ps := make([]Point, len(c))
i := 0
for k, v := range c {
ps[i] = newPoint(v+brailleBase, k[0], k[1])
i++
}
return ps
}

55
canvas_test.go Normal file
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package termui
import (
"testing"
"github.com/davecgh/go-spew/spew"
)
func TestCanvasSet(t *testing.T) {
c := NewCanvas()
c.Set(0, 0)
c.Set(0, 1)
c.Set(0, 2)
c.Set(0, 3)
c.Set(1, 3)
c.Set(2, 3)
c.Set(3, 3)
c.Set(4, 3)
c.Set(5, 3)
spew.Dump(c)
}
func TestCanvasUnset(t *testing.T) {
c := NewCanvas()
c.Set(0, 0)
c.Set(0, 1)
c.Set(0, 2)
c.Unset(0, 2)
spew.Dump(c)
c.Unset(0, 3)
spew.Dump(c)
}
func TestCanvasBuffer(t *testing.T) {
c := NewCanvas()
c.Set(0, 0)
c.Set(0, 1)
c.Set(0, 2)
c.Set(0, 3)
c.Set(1, 3)
c.Set(2, 3)
c.Set(3, 3)
c.Set(4, 3)
c.Set(5, 3)
c.Set(6, 3)
c.Set(7, 2)
c.Set(8, 1)
c.Set(9, 0)
bufs := c.Buffer()
rs := make([]rune, len(bufs))
for i, v := range bufs {
rs[i] = v.Ch
}
spew.Dump(string(rs))
}