snapshot

sequence/buffer_test.go

@@ -165,7 +165,7 @@ func TestNewBuffer(t *testing.T) {
 	empty := NewBuffer()
 	assert.NotNil(empty)
 	assert.Zero(empty.Len())
-	assert.Equal(valueBufferDefaultCapacity, empty.Capacity())
+	assert.Equal(bufferDefaultCapacity, empty.Capacity())
 	assert.Zero(empty.Peek())
 	assert.Zero(empty.PeekBack())
 }
@@ -176,7 +176,7 @@ func TestNewBufferWithValues(t *testing.T) {
 	values := NewBuffer(1, 2, 3, 4, 5)
 	assert.NotNil(values)
 	assert.Equal(5, values.Len())
-	assert.Equal(valueBufferDefaultCapacity, values.Capacity())
+	assert.Equal(bufferDefaultCapacity, values.Capacity())
 	assert.Equal(1, values.Peek())
 	assert.Equal(5, values.PeekBack())
 }

sequence/generate.go

@@ -1,61 +0,0 @@
-package sequence
-
-import (
-	"math/rand"
-	"time"
-)
-
-var (
-	// Generate contains some sequence generation utilities.
-	// These utilities can be useful for generating test data.
-	Generate = &generate{
-		rnd: rand.New(rand.NewSource(time.Now().Unix())),
-	}
-)
-
-type generate struct {
-	rnd *rand.Rand
-}
-
-// Values produces an array of floats from [start,end] by optional steps.
-func (g generate) Values(start, end float64, steps ...float64) Seq {
-	var values []float64
-	step := 1.0
-	if len(steps) > 0 {
-		step = steps[0]
-	}
-
-	if start < end {
-		for x := start; x <= end; x += step {
-			values = append(values, x)
-		}
-	} else {
-		for x := start; x >= end; x = x - step {
-			values = append(values, x)
-		}
-	}
-	return Seq{Array(values)}
-}
-
-// Random generates a fixed length sequence of random values between (0, scale).
-func (g generate) RandomValues(samples int, scale float64) Seq {
-	values := make([]float64, samples)
-
-	for x := 0; x < samples; x++ {
-		values[x] = g.rnd.Float64() * scale
-	}
-
-	return Seq{Array(values)}
-}
-
-// Random generates a fixed length sequence of random values with a given average, above and below that average by (-scale, scale)
-func (g generate) RandomValuesWithAverage(samples int, average, scale float64) Seq {
-	values := make([]float64, samples)
-
-	for x := 0; x < samples; x++ {
-		jitter := scale - (g.rnd.Float64() * (2 * scale))
-		values[x] = average + jitter
-	}
-
-	return Seq{Array(values)}
-}

sequence/random.go

@@ -1,21 +1,50 @@
 package sequence
 
-import "math/rand"
+import (
+	"math"
+	"math/rand"
+)
 
+// Random is a random number sequence generator.
 type Random struct {
 	rnd     *rand.Rand
 	scale   *float64
 	average *float64
-	len     int
+	len     *int
 }
 
+// Len returns the number of elements that will be generated.
 func (r *Random) Len() int {
-	return r.len
+	if r.len != nil {
+		return *r.len
+	}
+	return math.MaxInt32
 }
 
+// GetValue returns the value.
 func (r *Random) GetValue(_ int) float64 {
-	if r.scale != nil {
+	if r.average != nil && r.scale != nil {
+		return *r.average + *r.scale - (r.rnd.Float64() * (2 * *r.scale))
+	} else if r.scale != nil {
 		return r.rnd.Float64() * *r.scale
 	}
 	return r.rnd.Float64()
 }
+
+// WithLen sets a maximum len
+func (r *Random) WithLen(length int) *Random {
+	r.len = &length
+	return r
+}
+
+// WithScale sets the scale and returns the Random.
+func (r *Random) WithScale(scale float64) *Random {
+	r.scale = &scale
+	return r
+}
+
+// WithAverage sets the average and returns the Random.
+func (r *Random) WithAverage(average float64) *Random {
+	r.average = &average
+	return r
+}

sequence/time.go

@@ -123,8 +123,8 @@ func (ts timeSequence) Hours(start time.Time, totalHours int) []time.Time {
 
 // HoursFilled adds zero values for the data bounded by the start and end of the xdata array.
 func (ts timeSequence) HoursFilled(xdata []time.Time, ydata []float64) ([]time.Time, []float64) {
-	start := util.Date.Start(xdata)
-	end := util.Date.End(xdata)
+	start := Time.Start(xdata)
+	end := Time.End(xdata)
 
 	totalHours := util.Math.AbsInt(util.Date.DiffHours(start, end))
 

sequence/time_test.go

@@ -5,52 +5,43 @@ import (
 	"time"
 
 	assert "github.com/blendlabs/go-assert"
+	"github.com/wcharczuk/go-chart/util"
 )
 
-func TestSequenceFloat64(t *testing.T) {
+func TestTimeMarketHours(t *testing.T) {
 	assert := assert.New(t)
 
-	asc := Generate.Float64(1.0, 10.0)
-	assert.Len(asc, 10)
-
-	desc := Generate.Float64(10.0, 1.0)
-	assert.Len(desc, 10)
-}
-
-func TestSequenceMarketHours(t *testing.T) {
-	assert := assert.New(t)
-
-	today := time.Date(2016, 07, 01, 12, 0, 0, 0, Date.Eastern())
-	mh := Generate.MarketHours(today, today, NYSEOpen(), NYSEClose(), Date.IsNYSEHoliday)
+	today := time.Date(2016, 07, 01, 12, 0, 0, 0, util.Date.Eastern())
+	mh := Time.MarketHours(today, today, util.NYSEOpen(), util.NYSEClose(), util.Date.IsNYSEHoliday)
 	assert.Len(mh, 8)
-	assert.Equal(Date.Eastern(), mh[0].Location())
+	assert.Equal(util.Date.Eastern(), mh[0].Location())
 }
 
-func TestSequenceMarketQuarters(t *testing.T) {
+func TestTimeMarketHourQuarters(t *testing.T) {
 	assert := assert.New(t)
-	today := time.Date(2016, 07, 01, 12, 0, 0, 0, Date.Eastern())
-	mh := Generate.MarketHourQuarters(today, today, NYSEOpen(), NYSEClose(), Date.IsNYSEHoliday)
+	today := time.Date(2016, 07, 01, 12, 0, 0, 0, util.Date.Eastern())
+	mh := Time.MarketHourQuarters(today, today, util.NYSEOpen(), util.NYSEClose(), util.Date.IsNYSEHoliday)
 	assert.Len(mh, 4)
 	assert.Equal(9, mh[0].Hour())
 	assert.Equal(30, mh[0].Minute())
-	assert.Equal(Date.Eastern(), mh[0].Location())
+	assert.Equal(util.Date.Eastern(), mh[0].Location())
 
 	assert.Equal(12, mh[1].Hour())
 	assert.Equal(00, mh[1].Minute())
-	assert.Equal(Date.Eastern(), mh[1].Location())
+	assert.Equal(util.Date.Eastern(), mh[1].Location())
 
 	assert.Equal(14, mh[2].Hour())
 	assert.Equal(00, mh[2].Minute())
-	assert.Equal(Date.Eastern(), mh[2].Location())
+	assert.Equal(util.Date.Eastern(), mh[2].Location())
 }
 
-func TestSequenceHours(t *testing.T) {
+func TestTimeHours(t *testing.T) {
 	assert := assert.New(t)
 
 	today := time.Date(2016, 07, 01, 12, 0, 0, 0, time.UTC)
-	seq := Generate.Hours(today, 24)
+	seq := Time.Hours(today, 24)
 
-	end := Date.End(seq)
+	end := Time.End(seq)
 	assert.Len(seq, 24)
 	assert.Equal(2016, end.Year())
 	assert.Equal(07, int(end.Month()))
@@ -81,8 +72,8 @@ func TestSequenceHoursFill(t *testing.T) {
 		0.6,
 	}
 
-	filledTimes, filledValues := Generate.HoursFilled(xdata, ydata)
-	assert.Len(filledTimes, Date.DiffHours(Date.Start(xdata), Date.End(xdata))+1)
+	filledTimes, filledValues := Time.HoursFilled(xdata, ydata)
+	assert.Len(filledTimes, util.Date.DiffHours(Time.Start(xdata), Time.End(xdata))+1)
 	assert.Equal(len(filledValues), len(filledTimes))
 
 	assert.NotZero(filledValues[0])