Add data label to bar chart

hack/benchmark/cpu_usage/chart.go

@@ -20,6 +20,7 @@ import (
 	"encoding/csv"
 	"fmt"
 	"log"
+	"math"
 	"os"
 	"runtime"
 	"strconv"
@@ -31,6 +32,16 @@ import (
 	"gonum.org/v1/plot/vg"
 )
 
+type integerTicks struct{}
+
+func (integerTicks) Ticks(min, max float64) []plot.Tick {
+	var t []plot.Tick
+	for i := math.Trunc(min); i <= max; i += 50 {
+		t = append(t, plot.Tick{Value: i, Label: fmt.Sprint(i)})
+	}
+	return t
+}
+
 func main() {
 	if err := execute(); err != nil {
 		fmt.Println(err)
@@ -106,8 +117,45 @@ func execute() error {
 	} else if runtime.GOOS == "linux" {
 		p.NominalX("OS idle", "minikube kvm2", "minikube virtualbox", "minikube docker", "minikube docker auto-pause", "Docker idle", "k3d", "kind")
 	}
+	p.X.Label.Text = "Tools"
 
-	// output bar graph
+	// Set data label to each bar
+	var cpuLabels []string
+	for i := range results {
+		cLabel := strconv.FormatFloat(results[i], 'f', -1, 64)
+		cpuLabels = append(cpuLabels, cLabel)
+	}
+
+	var xysCPU []plotter.XY
+	for i := range results {
+		rxPos := float64(i)-0.13
+		ryPos := results[i]+0.1
+		cXY := plotter.XY{X: rxPos, Y: ryPos}
+		xysCPU = append(xysCPU, cXY)
+	}
+	// CPU Busy% data label
+	cl, err := plotter.NewLabels(plotter.XYLabels{
+			XYs:    xysCPU,
+			Labels: cpuLabels,
+		},
+	)
+	if err != nil {
+		log.Fatalf("could not creates labels plotter: %+v", err)
+	}
+	//for i := range rl.TextStyle {
+	//	rl.TextStyle[i].Color = color.RGBA{R: 255, A: 255}
+	//}
+	var t []plot.Tick
+	for i := math.Trunc(0); i <= 300; i += 50 {
+		t = append(t, plot.Tick{Value: i, Label: fmt.Sprint(i)})
+	}
+	// define max cpu busy% to 30%
+	p.Y.Max = 30
+	p.Y.Tick.Marker = integerTicks{}
+	// Add CPU Busy% label to plot
+	p.Add(cl)
+
+	// Output bar graph
 	if runtime.GOOS == "darwin" {
 		if err := p.Save(13*vg.Inch, 8*vg.Inch, "./site/static/images/benchmarks/cpuUsage/mac.png"); err != nil {
 			return errors.Wrap(err, "Failed to create bar graph png")
@@ -120,4 +168,4 @@ func execute() error {
 		log.Printf("Generated graph png to 'site/static/images/benchmarks/cpuUsage/linux.png'")
 	}
 	return nil
-}
+}

hack/benchmark/cpu_usage/test.txt

@@ -0,0 +1,113 @@
+package main
+
+import (
+"fmt"
+"image/color"
+"log"
+"math"
+"strconv"
+
+"gonum.org/v1/plot"
+"gonum.org/v1/plot/plotter"
+"gonum.org/v1/plot/vg"
+)
+
+type integerTicks struct{}
+
+func (integerTicks) Ticks(min, max float64) []plot.Tick {
+    var t []plot.Tick
+    for i := math.Trunc(min); i <= max; i += 50 {
+	 t = append(t, plot.Tick{Value: i, Label: fmt.Sprint(i)})
+  }
+return t
+}
+
+func main() {
+	red := plotter.Values{213, 206, 256, 256, 16, 122, 291}
+	black := plotter.Values{16, 86, 109, 290, 42, 257, 9}
+
+	days := []string{"Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"}
+
+	p := plot.New()
+
+	redC := color.RGBA{R: 255, A: 255}
+	blackC := color.RGBA{R: 196, G: 196, A: 255}
+
+	w := vg.Points(8)
+
+	redBars, err := plotter.NewBarChart(red, w)
+	if err != nil {
+		panic(err)
+	}
+	redBars.Color = redC
+	redBars.Offset = -w
+
+	blackBars, err := plotter.NewBarChart(black, w)
+	if err != nil {
+		panic(err)
+	}
+	blackBars.Color = blackC
+	blackBars.Offset = w
+
+	p.Add(blackBars, redBars)
+	p.NominalX(days...)
+
+	var redLabels []string
+	var blackLabels []string
+
+	for i := range red {
+		rLabel := strconv.FormatFloat(red[i], 'f', -1, 64)
+		bLabel := strconv.FormatFloat(black[i], 'f', -1, 64)
+
+		redLabels = append(redLabels, rLabel)
+		blackLabels = append(blackLabels, bLabel)
+	}
+
+	var xysR, xysB []plotter.XY
+
+	for i := range red {
+		rxPos, bxPos := float64(i)-0.5, float64(i)+0.1
+		ryPos, byPos := red[i]+5, black[i]+5
+
+		rXY := plotter.XY{X: rxPos, Y: ryPos}
+		bXY := plotter.XY{X: bxPos, Y: byPos}
+
+		xysR = append(xysR, rXY)
+		xysB = append(xysB, bXY)
+	}
+
+	rl, err := plotter.NewLabels(plotter.XYLabels{
+		XYs:    xysR,
+		Labels: redLabels,
+	},
+	)
+	if err != nil {
+		log.Fatalf("could not creates labels plotter: %+v", err)
+	}
+	for i := range rl.TextStyle {
+		rl.TextStyle[i].Color = color.RGBA{R: 255, A: 255}
+		//fmt.Println(r, i)
+	}
+
+	bl, err := plotter.NewLabels(plotter.XYLabels{
+		XYs:    xysB,
+		Labels: blackLabels,
+	},
+	)
+	if err != nil {
+		log.Fatalf("could not creates labels plotter: %+v", err)
+	}
+
+	var t []plot.Tick
+	for i := math.Trunc(0); i <= 300; i += 50 {
+		t = append(t, plot.Tick{Value: i, Label: fmt.Sprint(i)})
+	}
+	p.Y.Max = 310
+	p.Y.Tick.Marker = integerTicks{}
+
+	p.Add(rl, bl)
+
+	if err := p.Save(4*vg.Inch, 4*vg.Inch, "points.png"); err != nil {
+		panic(err)
+	}
+}