updates

cmd/chart/main.go

@@ -12,10 +12,15 @@ import (
 
 var (
 	outputPath = flag.String("output", "", "The output file")
+
 	inputFormat = flag.String("format", "csv", "The input format, either 'csv' or 'tsv' (defaults to 'csv')")
 	inputPath   = flag.String("f", "", "The input file")
-	disableLinreg     = flag.Bool("disable-linreg", false, "If we should omit linear regressions")
+	reverse     = flag.Bool("reverse", false, "If we should reverse the inputs")
-	disableLastValues = flag.Bool("disable-last-values", false, "If we should omit last values")
+
+	hideLegend     = flag.Bool("hide-legend", false, "If we should omit the chart legend")
+	hideSMA        = flag.Bool("hide-sma", false, "If we should omit simple moving average")
+	hideLinreg     = flag.Bool("hide-linreg", false, "If we should omit linear regressions")
+	hideLastValues = flag.Bool("hide-last-values", false, "If we should omit last values")
 )
 
 func main() {
@@ -58,6 +63,10 @@ func main() {
 		log.FatalErr(err)
 	}
 
+	if *reverse {
+		yvalues = chart.ValueSequence(yvalues...).Reverse().Values()
+	}
+
 	var series []chart.Series
 	mainSeries := chart.ContinuousSeries{
 		Name:    "Values",
@@ -66,17 +75,57 @@ func main() {
 	}
 	series = append(series, mainSeries)
 
-	if !*disableLinreg {
+	smaSeries := &chart.SMASeries{
+		Name: "SMA",
+		Style: chart.Style{
+			Hidden:          *hideSMA,
+			StrokeColor:     chart.ColorRed,
+			StrokeDashArray: []float64{5.0, 5.0},
+		},
+		InnerSeries: mainSeries,
+	}
+	series = append(series, smaSeries)
+
 	linRegSeries := &chart.LinearRegressionSeries{
+		Name: "Values - Lin. Reg.",
+		Style: chart.Style{
+			Hidden: *hideLinreg,
+		},
 		InnerSeries: mainSeries,
 	}
 	series = append(series, linRegSeries)
+
+	mainLastValue := chart.LastValueAnnotationSeries(mainSeries)
+	mainLastValue.Style = chart.Style{
+		Hidden: *hideLastValues,
 	}
+	series = append(series, mainLastValue)
+
+	linregLastValue := chart.LastValueAnnotationSeries(linRegSeries)
+	linregLastValue.Style = chart.Style{
+		Hidden: (*hideLastValues || *hideLinreg),
+	}
+	series = append(series, linregLastValue)
+
+	smaLastValue := chart.LastValueAnnotationSeries(smaSeries)
+	smaLastValue.Style = chart.Style{
+		Hidden: (*hideLastValues || *hideSMA),
+	}
+	series = append(series, smaLastValue)
 
 	graph := chart.Chart{
+		Background: chart.Style{
+			Padding: chart.Box{
+				Top: 50,
+			},
+		},
 		Series: series,
 	}
 
+	if !*hideLegend {
+		graph.Elements = []chart.Renderable{chart.LegendThin(&graph)}
+	}
+
 	var output *os.File
 	if *outputPath != "" {
 		output, err = os.Create(*outputPath)

last_value_annotation_series.go

@@ -2,8 +2,8 @@ package chart
 
 import "fmt"
 
-// LastValueAnnotation returns an annotation series of just the last value of a value provider.
+// LastValueAnnotationSeries returns an annotation series of just the last value of a value provider.
-func LastValueAnnotation(innerSeries ValuesProvider, vfs ...ValueFormatter) AnnotationSeries {
+func LastValueAnnotationSeries(innerSeries ValuesProvider, vfs ...ValueFormatter) AnnotationSeries {
 	var vf ValueFormatter
 	if len(vfs) > 0 {
 		vf = vfs[0]

last_value_annotation_series_test.go

@@ -6,7 +6,7 @@ import (
 	"github.com/blend/go-sdk/assert"
 )
 
-func TestLastValueAnnotation(t *testing.T) {
+func TestLastValueAnnotationSeries(t *testing.T) {
 	assert := assert.New(t)
 
 	series := ContinuousSeries{
@@ -14,7 +14,7 @@ func TestLastValueAnnotation(t *testing.T) {
 		YValues: []float64{5.0, 3.0, 3.0, 2.0, 1.0},
 	}
 
-	lva := LastValueAnnotation(series)
+	lva := LastValueAnnotationSeries(series)
 	assert.NotEmpty(lva.Annotations)
 	lvaa := lva.Annotations[0]
 	assert.Equal(5, lvaa.XValue)

seq.go

@@ -148,6 +148,27 @@ func (s Seq) Sort() Seq {
 	return Seq{Array(values)}
 }
 
+// Reverse reverses the sequence
+func (s Seq) Reverse() Seq {
+	if s.Len() == 0 {
+		return s
+	}
+
+	values := s.Values()
+	valuesLen := len(values)
+	valuesLen1 := len(values) - 1
+	valuesLen2 := valuesLen >> 1
+	var i, j float64
+	for index := 0; index < valuesLen2; index++ {
+		i = values[index]
+		j = values[valuesLen1-index]
+		values[index] = j
+		values[valuesLen1-index] = i
+	}
+
+	return Seq{Array(values)}
+}
+
 // Median returns the median or middle value in the sorted seq.
 func (s Seq) Median() (median float64) {
 	l := s.Len()