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// Copyright 2016 Zack Guo <zack.y.guo@gmail.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
// Sparkline is like: ▅▆▂▂▅▇▂▂▃▆▆▆▅▃. The data points should be non-negative integers.
/*
data := []int{4, 2, 1, 6, 3, 9, 1, 4, 2, 15, 14, 9, 8, 6, 10, 13, 15, 12, 10, 5, 3, 6, 1}
spl := termui.NewSparkline()
spl.Data = data
spl.Title = "Sparkline 0"
spl.LineColor = termui.ColorGreen
*/
type Sparkline struct {
Data []int
Height int
Title string
TitleColor Attribute
LineColor Attribute
displayHeight int
scale float32
max int
}
// Sparklines is a renderable widget which groups together the given sparklines.
/*
spls := termui.NewSparklines(spl0,spl1,spl2) //...
spls.Height = 2
spls.Width = 20
*/
type Sparklines struct {
Block
Lines []Sparkline
displayLines int
displayWidth int
}
var sparks = []rune{'▁', '▂', '▃', '▄', '▅', '▆', '▇', '█'}
// Add appends a given Sparkline to s *Sparklines.
func (s *Sparklines) Add(sl Sparkline) {
s.Lines = append(s.Lines, sl)
}
// NewSparkline returns a unrenderable single sparkline that intended to be added into Sparklines.
func NewSparkline() Sparkline {
return Sparkline{
Height: 1,
TitleColor: ThemeAttr("sparkline.title.fg"),
LineColor: ThemeAttr("sparkline.line.fg")}
}
// NewSparklines return a new *Spaklines with given Sparkline(s), you can always add a new Sparkline later.
func NewSparklines(ss ...Sparkline) *Sparklines {
s := &Sparklines{Block: *NewBlock(), Lines: ss}
return s
}
func (sl *Sparklines) update() {
for i, v := range sl.Lines {
if v.Title == "" {
sl.Lines[i].displayHeight = v.Height
} else {
sl.Lines[i].displayHeight = v.Height + 1
}
}
sl.displayWidth = sl.innerArea.Dx()
// get how many lines gotta display
h := 0
sl.displayLines = 0
for _, v := range sl.Lines {
if h+v.displayHeight <= sl.innerArea.Dy() {
sl.displayLines++
} else {
break
}
h += v.displayHeight
}
for i := 0; i < sl.displayLines; i++ {
data := sl.Lines[i].Data
max := 0
for _, v := range data {
if max < v {
max = v
}
}
sl.Lines[i].max = max
if max != 0 {
sl.Lines[i].scale = float32(8*sl.Lines[i].Height) / float32(max)
} else { // when all negative
sl.Lines[i].scale = 0
}
}
}
// Buffer implements Bufferer interface.
func (sl *Sparklines) Buffer() Buffer {
buf := sl.Block.Buffer()
sl.update()
oftY := 0
for i := 0; i < sl.displayLines; i++ {
l := sl.Lines[i]
data := l.Data
if len(data) > sl.innerArea.Dx() {
data = data[len(data)-sl.innerArea.Dx():]
}
if l.Title != "" {
rs := trimStr2Runes(l.Title, sl.innerArea.Dx())
oftX := 0
for _, v := range rs {
w := charWidth(v)
c := Cell{
Ch: v,
Fg: l.TitleColor,
Bg: sl.Bg,
}
x := sl.innerArea.Min.X + oftX
y := sl.innerArea.Min.Y + oftY
buf.Set(x, y, c)
oftX += w
}
}
for j, v := range data {
// display height of the data point, zero when data is negative
h := int(float32(v)*l.scale + 0.5)
if v < 0 {
h = 0
}
barCnt := h / 8
barMod := h % 8
for jj := 0; jj < barCnt; jj++ {
c := Cell{
Ch: ' ', // => sparks[7]
Bg: l.LineColor,
}
x := sl.innerArea.Min.X + j
y := sl.innerArea.Min.Y + oftY + l.Height - jj
//p.Bg = sl.BgColor
buf.Set(x, y, c)
}
if barMod != 0 {
c := Cell{
Ch: sparks[barMod-1],
Fg: l.LineColor,
Bg: sl.Bg,
}
x := sl.innerArea.Min.X + j
y := sl.innerArea.Min.Y + oftY + l.Height - barCnt
buf.Set(x, y, c)
}
}
oftY += l.displayHeight
}
return buf
}
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