138 lines
3.8 KiB
Go
138 lines
3.8 KiB
Go
package runchart
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import (
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ui "github.com/gizak/termui/v3"
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"image"
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"math"
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"time"
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)
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type ChartGrid struct {
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timeRange TimeRange
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timePerPoint time.Duration
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valueExtrema ValueExtrema
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linesCount int
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maxTimeWidth int
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minTimeWidth int
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}
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func (c *RunChart) newChartGrid() ChartGrid {
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linesCount := (c.Inner.Max.X - c.Inner.Min.X - c.grid.minTimeWidth) / xAxisGridWidth
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timeRange := c.getTimeRange(linesCount)
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return ChartGrid{
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timeRange: timeRange,
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timePerPoint: c.timescale / time.Duration(xAxisGridWidth),
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valueExtrema: getLocalExtrema(c.lines, timeRange),
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linesCount: linesCount,
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maxTimeWidth: c.Inner.Max.X,
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minTimeWidth: c.getMaxValueLength(),
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}
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}
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func (c *RunChart) renderAxes(buffer *ui.Buffer) {
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// draw origin cell
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buffer.SetCell(
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ui.NewCell(ui.BOTTOM_LEFT, ui.NewStyle(c.palette.BaseColor)),
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image.Pt(c.Inner.Min.X+c.grid.minTimeWidth, c.Inner.Max.Y-xAxisLabelsHeight-1))
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// draw x axis line
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for i := c.grid.minTimeWidth + 1; i < c.Inner.Dx(); i++ {
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buffer.SetCell(
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ui.NewCell(ui.HORIZONTAL_DASH, ui.NewStyle(c.palette.BaseColor)),
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image.Pt(i+c.Inner.Min.X, c.Inner.Max.Y-xAxisLabelsHeight-1))
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}
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// draw grid lines
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for y := 0; y < c.Inner.Dy()-xAxisLabelsHeight-2; y = y + 2 {
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for x := 1; x <= c.grid.linesCount; x++ {
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buffer.SetCell(
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ui.NewCell(ui.VERTICAL_DASH, ui.NewStyle(c.palette.MediumColor)),
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image.Pt(c.grid.maxTimeWidth-x*xAxisGridWidth, y+c.Inner.Min.Y+1))
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}
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}
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// draw y axis line
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for i := 0; i < c.Inner.Dy()-xAxisLabelsHeight-1; i++ {
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buffer.SetCell(
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ui.NewCell(ui.VERTICAL_DASH, ui.NewStyle(c.palette.BaseColor)),
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image.Pt(c.Inner.Min.X+c.grid.minTimeWidth, i+c.Inner.Min.Y))
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}
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// draw x axis time labels
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for i := 1; i <= c.grid.linesCount; i++ {
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labelTime := c.grid.timeRange.max.Add(time.Duration(-i) * c.timescale)
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buffer.SetString(
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labelTime.Format("15:04:05"),
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ui.NewStyle(c.palette.BaseColor),
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image.Pt(c.grid.maxTimeWidth-xAxisLabelsWidth/2-i*(xAxisGridWidth), c.Inner.Max.Y-1))
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}
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// draw y axis labels
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if c.grid.valueExtrema.max != c.grid.valueExtrema.min {
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labelsCount := (c.Inner.Dy() - xAxisLabelsHeight - 1) / (yAxisLabelsIndent + yAxisLabelsHeight)
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valuePerY := (c.grid.valueExtrema.max - c.grid.valueExtrema.min) / float64(c.Inner.Dy()-xAxisLabelsHeight-3)
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for i := 0; i < int(labelsCount); i++ {
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value := c.grid.valueExtrema.max - (valuePerY * float64(i) * (yAxisLabelsIndent + yAxisLabelsHeight))
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buffer.SetString(
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formatValue(value, c.scale),
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ui.NewStyle(c.palette.BaseColor),
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image.Pt(c.Inner.Min.X, 1+c.Inner.Min.Y+i*(yAxisLabelsIndent+yAxisLabelsHeight)))
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}
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} else {
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buffer.SetString(
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formatValue(c.grid.valueExtrema.max, c.scale),
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ui.NewStyle(c.palette.BaseColor),
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image.Pt(c.Inner.Min.X, c.Inner.Min.Y+c.Inner.Dy()/2))
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}
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}
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func (c *RunChart) getTimeRange(linesCount int) TimeRange {
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if c.mode == ModePinpoint {
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return c.grid.timeRange
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}
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width := time.Duration(c.timescale.Nanoseconds() * int64(linesCount))
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max := time.Now()
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return TimeRange{
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max: max,
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min: max.Add(-width),
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}
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}
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func getLocalExtrema(items []TimeLine, timeRange TimeRange) ValueExtrema {
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if len(items) == 0 {
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return ValueExtrema{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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started := false
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for i := len(item.points) - 1; i > 0; i-- {
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point := item.points[i]
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if timeRange.isInRange(point.time) {
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started = true
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} else if started == true && !timeRange.isInRange(point.time) {
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break
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}
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if point.value > max && timeRange.isInRange(point.time) {
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max = point.value
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}
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if point.value < min && timeRange.isInRange(point.time) {
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min = point.value
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}
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}
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}
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return ValueExtrema{max: max, min: min}
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}
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func (r *TimeRange) isInRange(time time.Time) bool {
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return time.After(r.min) && time.Before(r.max)
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}
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