160 lines
3.2 KiB
Go
160 lines
3.2 KiB
Go
package barchart
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import (
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"fmt"
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rw "github.com/mattn/go-runewidth"
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"github.com/sqshq/sampler/console"
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"github.com/sqshq/sampler/data"
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ui "github.com/sqshq/termui"
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"image"
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"math"
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"strconv"
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)
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const (
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barSymbol rune = '⠿'
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barIndent int = 1
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)
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type BarChart struct {
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ui.Block
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bars []Bar
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scale int
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maxValue float64
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count int64
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}
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type Bar struct {
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label string
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color ui.Color
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value float64
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delta float64
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}
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func NewBarChart(title string, scale int) *BarChart {
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block := *ui.NewBlock()
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block.Title = title
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return &BarChart{
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Block: block,
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bars: []Bar{},
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scale: scale,
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maxValue: -math.MaxFloat64,
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}
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}
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func (b *BarChart) AddBar(label string, color ui.Color) {
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b.bars = append(b.bars, Bar{label: label, color: color, value: 0})
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}
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func (b *BarChart) ConsumeSample(sample data.Sample) {
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b.count++
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float, err := strconv.ParseFloat(sample.Value, 64)
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if err != nil {
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// TODO visual notification + check sample.Error
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}
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index := -1
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for i, bar := range b.bars {
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if bar.label == sample.Label {
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index = i
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}
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}
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bar := b.bars[index]
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bar.delta = float - bar.value
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bar.value = float
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b.bars[index] = bar
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if float > b.maxValue {
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b.maxValue = float
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}
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// normalize bars height once in a while
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if b.count%500 == 0 {
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b.reselectMaxValue()
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}
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}
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func (b *BarChart) reselectMaxValue() {
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maxValue := -math.MaxFloat64
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for _, bar := range b.bars {
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if bar.value > maxValue {
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maxValue = bar.value
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}
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}
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b.maxValue = maxValue
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}
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func (b *BarChart) Draw(buf *ui.Buffer) {
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b.Block.Draw(buf)
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barWidth := (b.Inner.Dx() - 2*barIndent - len(b.bars)) / len(b.bars)
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barXCoordinate := b.Inner.Min.X + barIndent
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labelStyle := ui.NewStyle(console.ColorWhite)
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for _, bar := range b.bars {
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// draw bar
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height := int((bar.value / b.maxValue) * float64(b.Inner.Dy()-1))
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if height <= 1 {
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height = 2
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}
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maxYCoordinate := b.Inner.Max.Y - height
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for x := barXCoordinate; x < ui.MinInt(barXCoordinate+barWidth, b.Inner.Max.X-barIndent); x++ {
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for y := b.Inner.Max.Y - 2; y >= maxYCoordinate; y-- {
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c := ui.NewCell(barSymbol, ui.NewStyle(bar.color))
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buf.SetCell(c, image.Pt(x, y))
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}
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}
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// draw label
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labelXCoordinate := barXCoordinate +
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int(float64(barWidth)/2) -
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int(float64(rw.StringWidth(bar.label))/2)
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buf.SetString(
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bar.label,
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labelStyle,
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image.Pt(labelXCoordinate, b.Inner.Max.Y-1))
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// draw value & delta
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value := formatValue(bar.value, b.scale)
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if bar.delta != 0 {
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value = fmt.Sprintf("%s / %s", value, formatValueWithSign(bar.delta, b.scale))
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}
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valueXCoordinate := barXCoordinate +
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int(float64(barWidth)/2) -
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int(float64(rw.StringWidth(value))/2)
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buf.SetString(
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value,
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labelStyle,
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image.Pt(valueXCoordinate, maxYCoordinate-1))
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barXCoordinate += barWidth + barIndent
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}
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}
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// TODO extract to utils
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func formatValue(value float64, scale int) string {
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if math.Abs(value) == math.MaxFloat64 {
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return "Inf"
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} else {
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format := "%." + strconv.Itoa(scale) + "f"
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return fmt.Sprintf(format, value)
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}
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}
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// TODO extract to utils
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func formatValueWithSign(value float64, scale int) string {
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if value == 0 {
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return " 0"
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} else if value > 0 {
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return "+" + formatValue(value, scale)
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} else {
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return formatValue(value, scale)
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}
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}
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