498 lines
12 KiB
Go
498 lines
12 KiB
Go
package widgets
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import (
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"fmt"
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"github.com/sqshq/sampler/console"
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"github.com/sqshq/sampler/data"
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"image"
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"log"
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"math"
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"strconv"
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"sync"
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"time"
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. "github.com/sqshq/termui"
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)
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const (
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chartHistoryReserve = 10
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xAxisLabelsHeight = 1
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xAxisLabelsWidth = 8
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xAxisLabelsGap = 2
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yAxisLabelsHeight = 1
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yAxisLabelsGap = 1
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xAxisLegendWidth = 20
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)
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type RunChart struct {
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Block
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lines []TimeLine
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grid ChartGrid
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precision int
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selection *time.Time
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mutex *sync.Mutex
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}
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type TimePoint struct {
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time time.Time
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value float64
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line *TimeLine
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}
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type TimeLine struct {
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points []TimePoint
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color Color
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label string
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}
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type ChartGrid struct {
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linesCount int
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paddingDuration time.Duration
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paddingWidth int
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maxTimeWidth int
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minTimeWidth int
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valueExtremum ValueExtremum
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timeExtremum TimeExtremum
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}
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type TimeExtremum struct {
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max time.Time
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min time.Time
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}
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type ValueExtremum struct {
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max float64
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min float64
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}
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func NewRunChart(title string) *RunChart {
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block := *NewBlock()
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block.Title = title
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return &RunChart{
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Block: block,
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lines: []TimeLine{},
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mutex: &sync.Mutex{},
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precision: 2, // TODO move to config
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}
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}
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func (self *RunChart) newChartGrid() ChartGrid {
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linesCount := (self.Inner.Max.X - self.Inner.Min.X - self.grid.minTimeWidth) / (xAxisLabelsGap + xAxisLabelsWidth)
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paddingDuration := time.Duration(time.Second) // TODO support others and/or adjust automatically depending on refresh rate
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return ChartGrid{
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linesCount: linesCount,
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paddingDuration: paddingDuration,
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paddingWidth: xAxisLabelsGap + xAxisLabelsWidth,
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maxTimeWidth: self.Inner.Max.X,
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minTimeWidth: self.getMaxValueLength(),
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timeExtremum: GetTimeExtremum(linesCount, paddingDuration),
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valueExtremum: GetChartValueExtremum(self.lines),
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}
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}
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func (self *RunChart) Draw(buffer *Buffer) {
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self.mutex.Lock()
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self.Block.Draw(buffer)
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self.grid = self.newChartGrid()
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drawArea := image.Rect(
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self.Inner.Min.X+self.grid.minTimeWidth+1, self.Inner.Min.Y,
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self.Inner.Max.X, self.Inner.Max.Y-xAxisLabelsHeight-1,
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)
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selectedPoints := self.getSelectedTimePoints()
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self.renderAxes(buffer)
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self.renderItems(buffer, drawArea)
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self.renderSelection(buffer, drawArea, selectedPoints)
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self.renderLegend(buffer, drawArea, selectedPoints)
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self.mutex.Unlock()
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}
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func (self *RunChart) ConsumeSample(sample data.Sample) {
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float, err := strconv.ParseFloat(sample.Value, 64)
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if err != nil {
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log.Printf("Expected float number, but got %v", sample.Value) // TODO visual notification + check sample.Error
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}
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self.mutex.Lock()
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lineIndex := -1
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for i, line := range self.lines {
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if line.label == sample.Label {
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lineIndex = i
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}
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}
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if lineIndex == -1 {
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line := &TimeLine{
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points: []TimePoint{},
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color: sample.Color,
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label: sample.Label,
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}
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self.lines = append(self.lines, *line)
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lineIndex = len(self.lines) - 1
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}
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line := self.lines[lineIndex]
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timePoint := TimePoint{value: float, time: time.Now(), line: &line}
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line.points = append(line.points, timePoint)
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self.lines[lineIndex] = line
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self.trimOutOfRangeValues()
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self.mutex.Unlock()
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}
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func (self *RunChart) SelectPoint(x int, y int) {
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point := image.Point{X: x, Y: y}
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if !point.In(self.Rectangle) {
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self.selection = nil
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return
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}
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timeDeltaToPaddingRelation := (self.grid.maxTimeWidth - x) / self.grid.paddingWidth
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timeDeltaWithGridMaxTime := timeDeltaToPaddingRelation * int(self.grid.paddingDuration.Nanoseconds())
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selection := self.grid.timeExtremum.max.Add(-time.Duration(timeDeltaWithGridMaxTime) * time.Nanosecond)
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self.selection = &selection
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}
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func (self *RunChart) getSelectedTimePoints() []TimePoint {
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selected := []TimePoint{}
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if self.selection == nil {
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return selected
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}
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for _, line := range self.lines {
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if len(line.points) == 0 {
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continue
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}
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closest := line.points[0]
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for _, point := range line.points {
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diffWithClosest := math.Abs(float64(self.selection.UnixNano() - closest.time.UnixNano()))
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diffWithCurrent := math.Abs(float64(self.selection.UnixNano() - point.time.UnixNano()))
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if diffWithClosest > diffWithCurrent {
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closest = point
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}
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}
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selected = append(selected, closest)
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}
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return selected
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}
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func (self *RunChart) trimOutOfRangeValues() {
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historyReserve := self.grid.paddingDuration * time.Duration(self.grid.linesCount) * chartHistoryReserve
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minRangeTime := self.grid.timeExtremum.min.Add(-historyReserve)
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for i, item := range self.lines {
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lastOutOfRangeValueIndex := -1
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for j, point := range item.points {
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if point.time.Before(minRangeTime) {
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lastOutOfRangeValueIndex = j
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}
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}
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if lastOutOfRangeValueIndex > 0 {
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item.points = append(item.points[:0], item.points[lastOutOfRangeValueIndex+1:]...)
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self.lines[i] = item
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}
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}
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}
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func (self *RunChart) renderItems(buffer *Buffer, drawArea image.Rectangle) {
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canvas := NewCanvas()
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canvas.Rectangle = drawArea
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for _, line := range self.lines {
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xToPoint := make(map[int]image.Point)
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pointsOrder := make([]int, 0)
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for _, timePoint := range line.points {
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timeDeltaWithGridMaxTime := self.grid.timeExtremum.max.Sub(timePoint.time).Nanoseconds()
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timeDeltaToPaddingRelation := float64(timeDeltaWithGridMaxTime) / float64(self.grid.paddingDuration.Nanoseconds())
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x := self.grid.maxTimeWidth - (int(float64(self.grid.paddingWidth) * timeDeltaToPaddingRelation))
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var y int
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if self.grid.valueExtremum.max-self.grid.valueExtremum.min == 0 {
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y = (drawArea.Dy() - 2) / 2
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} else {
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valuePerY := (self.grid.valueExtremum.max - self.grid.valueExtremum.min) / float64(drawArea.Dy()-2)
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y = int(float64(timePoint.value-self.grid.valueExtremum.min) / valuePerY)
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}
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point := image.Pt(x, drawArea.Max.Y-y-1)
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if _, exists := xToPoint[x]; exists {
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continue
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}
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if !point.In(drawArea) {
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continue
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}
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xToPoint[x] = point
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pointsOrder = append(pointsOrder, x)
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}
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for i, x := range pointsOrder {
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currentPoint := xToPoint[x]
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var previousPoint image.Point
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if i == 0 {
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previousPoint = currentPoint
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} else {
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previousPoint = xToPoint[pointsOrder[i-1]]
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}
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canvas.Line(
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braillePoint(previousPoint),
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braillePoint(currentPoint),
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line.color,
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)
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}
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}
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canvas.Draw(buffer)
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}
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func (self *RunChart) renderAxes(buffer *Buffer) {
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// draw origin cell
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buffer.SetCell(
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NewCell(BOTTOM_LEFT, NewStyle(ColorWhite)),
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image.Pt(self.Inner.Min.X+self.grid.minTimeWidth, self.Inner.Max.Y-xAxisLabelsHeight-1),
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)
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// draw x axis line
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for i := self.grid.minTimeWidth + 1; i < self.Inner.Dx(); i++ {
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buffer.SetCell(
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NewCell(HORIZONTAL_DASH, NewStyle(ColorWhite)),
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image.Pt(i+self.Inner.Min.X, self.Inner.Max.Y-xAxisLabelsHeight-1),
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)
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}
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// draw grid lines
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for y := 0; y < self.Inner.Dy()-xAxisLabelsHeight-2; y = y + 2 {
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for x := 1; x <= self.grid.linesCount; x++ {
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buffer.SetCell(
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NewCell(VERTICAL_DASH, NewStyle(console.ColorDarkGrey)),
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image.Pt(self.grid.maxTimeWidth-x*self.grid.paddingWidth, y+self.Inner.Min.Y+1),
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)
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}
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}
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// draw y axis line
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for i := 0; i < self.Inner.Dy()-xAxisLabelsHeight-1; i++ {
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buffer.SetCell(
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NewCell(VERTICAL_DASH, NewStyle(ColorWhite)),
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image.Pt(self.Inner.Min.X+self.grid.minTimeWidth, i+self.Inner.Min.Y),
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)
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}
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// draw x axis time labels
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for i := 1; i <= self.grid.linesCount; i++ {
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labelTime := self.grid.timeExtremum.max.Add(time.Duration(-i) * self.grid.paddingDuration)
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buffer.SetString(
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labelTime.Format("15:04:05"),
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NewStyle(ColorWhite),
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image.Pt(self.grid.maxTimeWidth-xAxisLabelsWidth/2-i*(self.grid.paddingWidth), self.Inner.Max.Y-1),
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)
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}
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// draw y axis labels
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if self.grid.valueExtremum.max != self.grid.valueExtremum.min {
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labelsCount := (self.Inner.Dy() - xAxisLabelsHeight - 1) / (yAxisLabelsGap + yAxisLabelsHeight)
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valuePerY := (self.grid.valueExtremum.max - self.grid.valueExtremum.min) / float64(self.Inner.Dy()-xAxisLabelsHeight-3)
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for i := 0; i < int(labelsCount); i++ {
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value := self.grid.valueExtremum.max - (valuePerY * float64(i) * (yAxisLabelsGap + yAxisLabelsHeight))
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buffer.SetString(
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formatValue(value, self.precision),
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NewStyle(ColorWhite),
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image.Pt(self.Inner.Min.X, 1+self.Inner.Min.Y+i*(yAxisLabelsGap+yAxisLabelsHeight)),
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)
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}
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} else {
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buffer.SetString(
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formatValue(self.grid.valueExtremum.max, self.precision),
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NewStyle(ColorWhite),
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image.Pt(self.Inner.Min.X, self.Inner.Dy()/2))
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}
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}
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func (self *RunChart) renderLegend(buffer *Buffer, rectangle image.Rectangle, selectedPoints []TimePoint) {
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for i, line := range self.lines {
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buffer.SetString(
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string(DOT),
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NewStyle(line.color),
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image.Pt(self.Inner.Max.X-xAxisLegendWidth-2, self.Inner.Min.Y+1+i*5),
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)
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buffer.SetString(
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fmt.Sprintf("%s", line.label),
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NewStyle(line.color),
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image.Pt(self.Inner.Max.X-xAxisLegendWidth, self.Inner.Min.Y+1+i*5),
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)
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if len(selectedPoints) > 0 {
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index := -1
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for i, p := range selectedPoints {
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if p.line.label == line.label {
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index = i
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}
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}
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if index != -1 {
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buffer.SetString(
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fmt.Sprintf("time: %v", selectedPoints[index].time.Format("15:04:05.000")),
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NewStyle(ColorWhite),
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image.Pt(self.Inner.Max.X-xAxisLegendWidth, self.Inner.Min.Y+2+i*5),
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)
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buffer.SetString(
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fmt.Sprintf("value: %s", formatValue(selectedPoints[index].value, self.precision)),
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NewStyle(ColorWhite),
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image.Pt(self.Inner.Max.X-xAxisLegendWidth, self.Inner.Min.Y+3+i*5),
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)
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}
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} else {
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extremum := GetLineValueExtremum(line.points)
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buffer.SetString(
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fmt.Sprintf("cur %s", formatValue(line.points[len(line.points)-1].value, self.precision)),
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NewStyle(ColorWhite),
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image.Pt(self.Inner.Max.X-xAxisLegendWidth, self.Inner.Min.Y+2+i*5),
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)
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buffer.SetString(
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fmt.Sprintf("max %s", formatValue(extremum.max, self.precision)),
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NewStyle(ColorWhite),
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image.Pt(self.Inner.Max.X-xAxisLegendWidth, self.Inner.Min.Y+3+i*5),
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)
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buffer.SetString(
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fmt.Sprintf("min %s", formatValue(extremum.min, self.precision)),
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NewStyle(ColorWhite),
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image.Pt(self.Inner.Max.X-xAxisLegendWidth, self.Inner.Min.Y+4+i*5),
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)
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}
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}
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}
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func (self *RunChart) renderSelection(buffer *Buffer, drawArea image.Rectangle, selectedPoints []TimePoint) {
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for _, timePoint := range selectedPoints {
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timeDeltaWithGridMaxTime := self.grid.timeExtremum.max.Sub(timePoint.time).Nanoseconds()
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timeDeltaToPaddingRelation := float64(timeDeltaWithGridMaxTime) / float64(self.grid.paddingDuration.Nanoseconds())
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x := self.grid.maxTimeWidth - (int(float64(self.grid.paddingWidth) * timeDeltaToPaddingRelation))
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var y int
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if self.grid.valueExtremum.max-self.grid.valueExtremum.min == 0 {
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y = (drawArea.Dy() - 2) / 2
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} else {
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valuePerY := (self.grid.valueExtremum.max - self.grid.valueExtremum.min) / float64(drawArea.Dy()-2)
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y = int(float64(timePoint.value-self.grid.valueExtremum.min) / valuePerY)
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}
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point := image.Pt(x, drawArea.Max.Y-y-1)
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if point.In(drawArea) {
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buffer.SetCell(NewCell('▲', NewStyle(timePoint.line.color)), point)
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}
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}
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}
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func (self *RunChart) getMaxValueLength() int {
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maxValueLength := 0
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for _, line := range self.lines {
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for _, point := range line.points {
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l := len(formatValue(point.value, self.precision))
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if l > maxValueLength {
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maxValueLength = l
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}
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}
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}
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return maxValueLength
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}
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func formatValue(value float64, precision int) string {
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format := "%." + strconv.Itoa(precision) + "f"
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return fmt.Sprintf(format, value)
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}
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func GetChartValueExtremum(items []TimeLine) ValueExtremum {
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if len(items) == 0 {
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return ValueExtremum{0, 0}
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}
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var max, min = -math.MaxFloat64, math.MaxFloat64
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for _, item := range items {
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for _, point := range item.points {
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if point.value > max {
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max = point.value
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}
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if point.value < min {
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min = point.value
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}
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}
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}
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return ValueExtremum{max: max, min: min}
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}
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func GetLineValueExtremum(points []TimePoint) ValueExtremum {
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if len(points) == 0 {
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return ValueExtremum{0, 0}
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}
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var max, min = -math.MaxFloat64, math.MaxFloat64
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for _, point := range points {
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if point.value > max {
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max = point.value
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}
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if point.value < min {
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min = point.value
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}
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}
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return ValueExtremum{max: max, min: min}
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}
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func GetTimeExtremum(linesCount int, paddingDuration time.Duration) TimeExtremum {
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maxTime := time.Now()
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return TimeExtremum{
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max: maxTime,
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min: maxTime.Add(-time.Duration(paddingDuration.Nanoseconds() * int64(linesCount))),
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}
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}
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