made chart labels/colors order reproducable, based on config

data/consumer.go

@@ -1,14 +1,11 @@
 package data
 
-import . "github.com/sqshq/termui"
-
 type Consumer interface {
 	ConsumeSample(sample Sample)
 }
 
 type Sample struct {
 	Label string
-	Color Color
 	Value string
 	Error error
 }

data/item.go

@@ -1,7 +1,7 @@
 package data
 
 import (
-	. "github.com/sqshq/termui"
+	ui "github.com/sqshq/termui"
 	"os/exec"
 	"strings"
 )
@@ -9,7 +9,7 @@ import (
 type Item struct {
 	Script string   `yaml:"script"`
 	Label  string   `yaml:"label"`
-	Color  Color  `yaml:"color"`
+	Color  ui.Color `yaml:"color"`
 }
 
 func (self *Item) nextValue() (value string, err error) {

data/sampler.go

@@ -29,7 +29,6 @@ func (self *Sampler) sample() {
 	sample := Sample{
 		Value: value,
 		Error: err,
-		Color: self.item.Color,
 		Label: self.item.Label,
 	}
 

main.go

@@ -28,6 +28,7 @@ func main() {
 		layout.AddComponent(chart, c.Title, c.Position, c.Size, widgets.TypeRunChart)
 
 		for _, item := range c.Items {
+			chart.AddLine(item.Label, item.Color)
 			data.NewSampler(chart, item, c.RefreshRateMs)
 		}
 	}

widgets/runchart/grid.go

@@ -36,15 +36,13 @@ func (c *RunChart) renderAxes(buffer *ui.Buffer) {
 	// draw origin cell
 	buffer.SetCell(
 		ui.NewCell(ui.BOTTOM_LEFT, ui.NewStyle(ui.ColorWhite)),
-		image.Pt(c.Inner.Min.X+c.grid.minTimeWidth, c.Inner.Max.Y-xAxisLabelsHeight-1),
+		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(ui.ColorWhite)),
-			image.Pt(i+c.Inner.Min.X, c.Inner.Max.Y-xAxisLabelsHeight-1),
+			image.Pt(i+c.Inner.Min.X, c.Inner.Max.Y-xAxisLabelsHeight-1))
-		)
 	}
 
 	// draw grid lines
@@ -52,8 +50,7 @@ func (c *RunChart) renderAxes(buffer *ui.Buffer) {
 		for x := 1; x <= c.grid.linesCount; x++ {
 			buffer.SetCell(
 				ui.NewCell(ui.VERTICAL_DASH, ui.NewStyle(console.ColorDarkGrey)),
-				image.Pt(c.grid.maxTimeWidth-x*xAxisGridWidth, y+c.Inner.Min.Y+1),
+				image.Pt(c.grid.maxTimeWidth-x*xAxisGridWidth, y+c.Inner.Min.Y+1))
-			)
 		}
 	}
 
@@ -61,8 +58,7 @@ func (c *RunChart) renderAxes(buffer *ui.Buffer) {
 	for i := 0; i < c.Inner.Dy()-xAxisLabelsHeight-1; i++ {
 		buffer.SetCell(
 			ui.NewCell(ui.VERTICAL_DASH, ui.NewStyle(ui.ColorWhite)),
-			image.Pt(c.Inner.Min.X+c.grid.minTimeWidth, i+c.Inner.Min.Y),
+			image.Pt(c.Inner.Min.X+c.grid.minTimeWidth, i+c.Inner.Min.Y))
-		)
 	}
 
 	// draw x axis time labels
@@ -71,8 +67,7 @@ func (c *RunChart) renderAxes(buffer *ui.Buffer) {
 		buffer.SetString(
 			labelTime.Format("15:04:05"),
 			ui.NewStyle(ui.ColorWhite),
-			image.Pt(c.grid.maxTimeWidth-xAxisLabelsWidth/2-i*(xAxisGridWidth), c.Inner.Max.Y-1),
+			image.Pt(c.grid.maxTimeWidth-xAxisLabelsWidth/2-i*(xAxisGridWidth), c.Inner.Max.Y-1))
-		)
 	}
 
 	// draw y axis labels
@@ -84,8 +79,7 @@ func (c *RunChart) renderAxes(buffer *ui.Buffer) {
 			buffer.SetString(
 				formatValue(value, c.precision),
 				ui.NewStyle(ui.ColorWhite),
-				image.Pt(c.Inner.Min.X, 1+c.Inner.Min.Y+i*(yAxisLabelsIndent+yAxisLabelsHeight)),
+				image.Pt(c.Inner.Min.X, 1+c.Inner.Min.Y+i*(yAxisLabelsIndent+yAxisLabelsHeight)))
-			)
 		}
 	} else {
 		buffer.SetString(

widgets/runchart/runchart.go

@@ -111,6 +111,16 @@ func (c *RunChart) Draw(buffer *ui.Buffer) {
 	c.mutex.Unlock()
 }
 
+func (c *RunChart) AddLine(Label string, color ui.Color) {
+	line := TimeLine{
+		points:  []TimePoint{},
+		color:   color,
+		label:   Label,
+		extrema: ValueExtrema{max: -math.MaxFloat64, min: math.MaxFloat64},
+	}
+	c.lines = append(c.lines, line)
+}
+
 func (c *RunChart) ConsumeSample(sample data.Sample) {
 
 	float, err := strconv.ParseFloat(sample.Value, 64)
@@ -121,40 +131,30 @@ func (c *RunChart) ConsumeSample(sample data.Sample) {
 
 	c.mutex.Lock()
 
-	lineIndex := -1
+	index := -1
-
 	for i, line := range c.lines {
 		if line.label == sample.Label {
-			lineIndex = i
+			index = i
 		}
 	}
 
-	if lineIndex == -1 {
+	line := c.lines[index]
-		line := &TimeLine{
-			points:  []TimePoint{},
-			color:   sample.Color,
-			label:   sample.Label,
-			extrema: ValueExtrema{max: float, min: float},
-		}
-		c.lines = append(c.lines, *line)
-		lineIndex = len(c.lines) - 1
-	}
-
-	line := c.lines[lineIndex]
 
 	if float < line.extrema.min {
 		line.extrema.min = float
 	}
-
 	if float > line.extrema.max {
 		line.extrema.max = float
 	}
 
-	timePoint := c.newTimePoint(float)
+	line.points = append(line.points, c.newTimePoint(float))
-	line.points = append(line.points, timePoint)
+	c.lines[index] = line
-	c.lines[lineIndex] = line
 
+	// perform cleanup once in a while
+	if len(line.points)%100 == 0 {
 		c.trimOutOfRangeValues()
+	}
+
 	c.mutex.Unlock()
 }