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package termui
var SPARKS = [8]rune{'▁', '▂', '▃', '▄', '▅', '▆', '▇', '█'}
// Sparkline is like: ▅▆▂▂▅▇▂▂▃▆▆▆▅▃. The data points should be non-negative integers.
type Sparkline struct {
Data []int
Title1 string
Title2 string
TitleColor Color
Total int
LineColor Color
}
// Sparklines is a renderable widget which groups together the given sparklines.
type Sparklines struct {
*Block
Lines []*Sparkline
}
// 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{
TitleColor: Theme.Fg,
LineColor: Theme.Sparkline,
}
}
// NewSparklines return a new *Sparklines with given Sparkline(s), you can always add a new Sparkline later.
func NewSparklines(ss ...*Sparkline) *Sparklines {
return &Sparklines{
Block: NewBlock(),
Lines: ss,
}
}
// Buffer implements Bufferer interface.
func (sl *Sparklines) Buffer() *Buffer {
buf := sl.Block.Buffer()
lc := len(sl.Lines) // lineCount
// for each line
for i, line := range sl.Lines {
title1Y := 2 + (sl.Y/lc)*i
title2Y := (2 + (sl.Y/lc)*i) + 1
title1 := MaxString(line.Title1, sl.X)
title2 := MaxString(line.Title2, sl.X)
buf.SetString(1, title1Y, title1, line.TitleColor|AttrBold, sl.Bg)
buf.SetString(1, title2Y, title2, line.TitleColor|AttrBold, sl.Bg)
// sparkline
sparkY := (sl.Y / lc) * (i + 1)
// finds max used for relative heights
max := 1
for i := len(line.Data) - 1; i >= 0 && sl.X-((len(line.Data)-1)-i) >= 1; i-- {
if line.Data[i] > max {
max = line.Data[i]
}
}
// prints sparkline
for x := sl.X; x >= 1; x-- {
char := SPARKS[0]
if (sl.X - x) < len(line.Data) {
char = SPARKS[int((float64(line.Data[(len(line.Data)-1)-(sl.X-x)])/float64(max))*7)]
}
buf.SetCell(x, sparkY, Cell{char, line.LineColor, sl.Bg})
}
}
return buf
}
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