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// Copyright 2017 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 widgets
import (
"image"
. "github.com/gizak/termui/v3"
)
// Sparkline is like: ▅▆▂▂▅▇▂▂▃▆▆▆▅▃. The data points should be non-negative integers.
type Sparkline struct {
Data []float64
Title string
TitleStyle Style
LineColor Color
MaxVal float64
MaxHeight int // TODO
}
// SparklineGroup is a renderable widget which groups together the given sparklines.
type SparklineGroup struct {
Block
Sparklines []*Sparkline
}
// NewSparkline returns a unrenderable single sparkline that needs to be added to a SparklineGroup
func NewSparkline() *Sparkline {
return &Sparkline{
TitleStyle: Theme.Sparkline.Title,
LineColor: Theme.Sparkline.Line,
}
}
func NewSparklineGroup(sls ...*Sparkline) *SparklineGroup {
return &SparklineGroup{
Block: *NewBlock(),
Sparklines: sls,
}
}
func (self *SparklineGroup) Draw(buf *Buffer) {
self.Block.Draw(buf)
sparklineHeight := self.Inner.Dy() / len(self.Sparklines)
for i, sl := range self.Sparklines {
heightOffset := (sparklineHeight * (i + 1))
barHeight := sparklineHeight
if i == len(self.Sparklines)-1 {
heightOffset = self.Inner.Dy()
barHeight = self.Inner.Dy() - (sparklineHeight * i)
}
if sl.Title != "" {
barHeight--
}
maxVal := sl.MaxVal
if maxVal == 0 {
maxVal, _ = GetMaxFloat64FromSlice(sl.Data)
}
// draw line
for j := 0; j < len(sl.Data) && j < self.Inner.Dx(); j++ {
data := sl.Data[j]
height := int((data / maxVal) * float64(barHeight))
sparkChar := BARS[len(BARS)-1]
for k := 0; k < height; k++ {
buf.SetCell(
NewCell(sparkChar, NewStyle(sl.LineColor)),
image.Pt(j+self.Inner.Min.X, self.Inner.Min.Y-1+heightOffset-k),
)
}
if height == 0 {
sparkChar = BARS[1]
buf.SetCell(
NewCell(sparkChar, NewStyle(sl.LineColor)),
image.Pt(j+self.Inner.Min.X, self.Inner.Min.Y-1+heightOffset),
)
}
}
if sl.Title != "" {
// draw title
buf.SetString(
TrimString(sl.Title, self.Inner.Dx()),
sl.TitleStyle,
image.Pt(self.Inner.Min.X, self.Inner.Min.Y-1+heightOffset-barHeight),
)
}
}
}
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