package runchart import ( ui "github.com/gizak/termui/v3" "image" "math" "time" ) type ChartGrid struct { timeRange TimeRange timePerPoint time.Duration valueExtrema ValueExtrema linesCount int maxTimeWidth int minTimeWidth int } func (c *RunChart) newChartGrid() ChartGrid { linesCount := (c.Inner.Max.X - c.Inner.Min.X - c.grid.minTimeWidth) / xAxisGridWidth timeRange := c.getTimeRange(linesCount) return ChartGrid{ timeRange: timeRange, timePerPoint: c.timescale / time.Duration(xAxisGridWidth), valueExtrema: getLocalExtrema(c.lines, timeRange), linesCount: linesCount, maxTimeWidth: c.Inner.Max.X, minTimeWidth: c.getMaxValueLength(), } } func (c *RunChart) renderAxes(buffer *ui.Buffer) { // draw origin cell buffer.SetCell( ui.NewCell(ui.BOTTOM_LEFT, ui.NewStyle(c.palette.BaseColor)), image.Pt(c.Inner.Min.X+c.grid.minTimeWidth, c.Inner.Max.Y-xAxisLabelsHeight-1)) // draw x axis line for i := c.grid.minTimeWidth + 1; i < c.Inner.Dx(); i++ { buffer.SetCell( ui.NewCell(ui.HORIZONTAL_DASH, ui.NewStyle(c.palette.BaseColor)), image.Pt(i+c.Inner.Min.X, c.Inner.Max.Y-xAxisLabelsHeight-1)) } // draw grid lines for y := 0; y < c.Inner.Dy()-xAxisLabelsHeight-2; y = y + 2 { for x := 1; x <= c.grid.linesCount; x++ { buffer.SetCell( ui.NewCell(ui.VERTICAL_DASH, ui.NewStyle(c.palette.MediumColor)), image.Pt(c.grid.maxTimeWidth-x*xAxisGridWidth, y+c.Inner.Min.Y+1)) } } // draw y axis line for i := 0; i < c.Inner.Dy()-xAxisLabelsHeight-1; i++ { buffer.SetCell( ui.NewCell(ui.VERTICAL_DASH, ui.NewStyle(c.palette.BaseColor)), image.Pt(c.Inner.Min.X+c.grid.minTimeWidth, i+c.Inner.Min.Y)) } // draw x axis time labels for i := 1; i <= c.grid.linesCount; i++ { labelTime := c.grid.timeRange.max.Add(time.Duration(-i) * c.timescale) buffer.SetString( labelTime.Format("15:04:05"), ui.NewStyle(c.palette.BaseColor), image.Pt(c.grid.maxTimeWidth-xAxisLabelsWidth/2-i*(xAxisGridWidth), c.Inner.Max.Y-1)) } // draw y axis labels if c.grid.valueExtrema.max != c.grid.valueExtrema.min { labelsCount := (c.Inner.Dy() - xAxisLabelsHeight - 1) / (yAxisLabelsIndent + yAxisLabelsHeight) valuePerY := (c.grid.valueExtrema.max - c.grid.valueExtrema.min) / float64(c.Inner.Dy()-xAxisLabelsHeight-3) for i := 0; i < int(labelsCount); i++ { value := c.grid.valueExtrema.max - (valuePerY * float64(i) * (yAxisLabelsIndent + yAxisLabelsHeight)) buffer.SetString( formatValue(value, c.scale), ui.NewStyle(c.palette.BaseColor), image.Pt(c.Inner.Min.X, 1+c.Inner.Min.Y+i*(yAxisLabelsIndent+yAxisLabelsHeight))) } } else { buffer.SetString( formatValue(c.grid.valueExtrema.max, c.scale), ui.NewStyle(c.palette.BaseColor), image.Pt(c.Inner.Min.X, c.Inner.Min.Y+c.Inner.Dy()/2)) } } func (c *RunChart) getTimeRange(linesCount int) TimeRange { if c.mode == ModePinpoint { return c.grid.timeRange } width := time.Duration(c.timescale.Nanoseconds() * int64(linesCount)) max := time.Now() return TimeRange{ max: max, min: max.Add(-width), } } func getLocalExtrema(items []TimeLine, timeRange TimeRange) ValueExtrema { if len(items) == 0 { return ValueExtrema{0, 0} } var max, min = -math.MaxFloat64, math.MaxFloat64 for _, item := range items { started := false for i := len(item.points) - 1; i > 0; i-- { point := item.points[i] if timeRange.isInRange(point.time) { started = true } else if started == true && !timeRange.isInRange(point.time) { break } if point.value > max && timeRange.isInRange(point.time) { max = point.value } if point.value < min && timeRange.isInRange(point.time) { min = point.value } } } return ValueExtrema{max: max, min: min} } func (r *TimeRange) isInRange(time time.Time) bool { return time.After(r.min) && time.Before(r.max) }