Adds the ability to draw an XY scatter plot. (#27)
* works more or less * updating comment * removing debugging printf * adding output * tweaks * missed a couple series validations * testing auto coloring * updated output.png * color tests etc. * sanity check tests. * should not use unkeyed fields anyway.
This commit is contained in:
parent
17b28beae8
commit
b713ff85cc
22 changed files with 511 additions and 72 deletions
|
@ -23,7 +23,7 @@ func parseFloat64(str string) float64 {
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func readData() ([]time.Time, []float64) {
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var xvalues []time.Time
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var yvalues []float64
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chart.File.ReadByLines("requests.csv", func(line string) {
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err := chart.File.ReadByLines("requests.csv", func(line string) {
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parts := strings.Split(line, ",")
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year := parseInt(parts[0])
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month := parseInt(parts[1])
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@ -33,6 +33,9 @@ func readData() ([]time.Time, []float64) {
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xvalues = append(xvalues, time.Date(year, time.Month(month), day, hour, 0, 0, 0, time.UTC))
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yvalues = append(yvalues, elapsedMillis)
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})
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if err != nil {
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fmt.Println(err.Error())
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}
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return xvalues, yvalues
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}
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80
_examples/scatter/main.go
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80
_examples/scatter/main.go
Normal file
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@ -0,0 +1,80 @@
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package main
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import (
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"log"
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"net/http"
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"github.com/wcharczuk/go-chart"
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)
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func drawChart(res http.ResponseWriter, req *http.Request) {
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graph := chart.Chart{
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Series: []chart.Series{
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chart.ContinuousSeries{
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Style: chart.Style{
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Show: true,
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StrokeWidth: chart.Disabled,
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DotWidth: 3,
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},
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XValues: chart.Sequence.Random(32, 1024),
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YValues: chart.Sequence.Random(32, 1024),
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},
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chart.ContinuousSeries{
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Style: chart.Style{
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Show: true,
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StrokeWidth: chart.Disabled,
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DotWidth: 5,
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},
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XValues: chart.Sequence.Random(16, 1024),
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YValues: chart.Sequence.Random(16, 1024),
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},
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chart.ContinuousSeries{
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Style: chart.Style{
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Show: true,
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StrokeWidth: chart.Disabled,
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DotWidth: 7,
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},
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XValues: chart.Sequence.Random(8, 1024),
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YValues: chart.Sequence.Random(8, 1024),
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},
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},
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}
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res.Header().Set("Content-Type", "image/png")
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err := graph.Render(chart.PNG, res)
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if err != nil {
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log.Println(err.Error())
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}
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}
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func unit(res http.ResponseWriter, req *http.Request) {
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graph := chart.Chart{
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Height: 50,
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Width: 50,
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Canvas: chart.Style{
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Padding: chart.Box{IsSet: true},
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},
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Background: chart.Style{
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Padding: chart.Box{IsSet: true},
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},
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Series: []chart.Series{
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chart.ContinuousSeries{
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XValues: chart.Sequence.Float64(0, 4, 1),
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YValues: chart.Sequence.Float64(0, 4, 1),
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},
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},
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}
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res.Header().Set("Content-Type", "image/png")
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err := graph.Render(chart.PNG, res)
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if err != nil {
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log.Println(err.Error())
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}
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}
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func main() {
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http.HandleFunc("/", drawChart)
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http.HandleFunc("/unit", unit)
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log.Fatal(http.ListenAndServe(":8080", nil))
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}
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BIN
_examples/scatter/output.png
Normal file
BIN
_examples/scatter/output.png
Normal file
Binary file not shown.
After Width: | Height: | Size: 12 KiB |
29
box.go
29
box.go
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@ -5,16 +5,36 @@ import (
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"math"
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)
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var (
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// BoxZero is a preset box that represents an intentional zero value.
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BoxZero = Box{IsSet: true}
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)
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// NewBox returns a new (set) box.
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func NewBox(top, left, right, bottom int) Box {
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return Box{
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IsSet: true,
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Top: top,
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Left: left,
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Right: right,
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Bottom: bottom,
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}
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}
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// Box represents the main 4 dimensions of a box.
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type Box struct {
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Top int
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Left int
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Right int
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Bottom int
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IsSet bool
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}
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// IsZero returns if the box is set or not.
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func (b Box) IsZero() bool {
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if b.IsSet {
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return false
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}
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return b.Top == 0 && b.Left == 0 && b.Right == 0 && b.Bottom == 0
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}
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@ -25,7 +45,7 @@ func (b Box) String() string {
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// GetTop returns a coalesced value with a default.
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func (b Box) GetTop(defaults ...int) int {
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if b.Top == 0 {
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if !b.IsSet && b.Top == 0 {
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if len(defaults) > 0 {
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return defaults[0]
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}
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@ -36,7 +56,7 @@ func (b Box) GetTop(defaults ...int) int {
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// GetLeft returns a coalesced value with a default.
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func (b Box) GetLeft(defaults ...int) int {
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if b.Left == 0 {
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if !b.IsSet && b.Left == 0 {
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if len(defaults) > 0 {
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return defaults[0]
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}
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@ -47,7 +67,7 @@ func (b Box) GetLeft(defaults ...int) int {
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// GetRight returns a coalesced value with a default.
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func (b Box) GetRight(defaults ...int) int {
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if b.Right == 0 {
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if !b.IsSet && b.Right == 0 {
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if len(defaults) > 0 {
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return defaults[0]
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}
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@ -58,7 +78,7 @@ func (b Box) GetRight(defaults ...int) int {
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// GetBottom returns a coalesced value with a default.
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func (b Box) GetBottom(defaults ...int) int {
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if b.Bottom == 0 {
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if !b.IsSet && b.Bottom == 0 {
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if len(defaults) > 0 {
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return defaults[0]
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}
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@ -91,6 +111,7 @@ func (b Box) Aspect() float64 {
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// Clone returns a new copy of the box.
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func (b Box) Clone() Box {
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return Box{
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IsSet: b.IsSet,
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Top: b.Top,
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Left: b.Left,
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Right: b.Right,
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@ -109,9 +109,9 @@ func TestBoxConstrain(t *testing.T) {
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func TestBoxOuterConstrain(t *testing.T) {
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assert := assert.New(t)
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box := Box{0, 0, 100, 100}
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canvas := Box{5, 5, 95, 95}
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taller := Box{-10, 5, 50, 50}
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box := NewBox(0, 0, 100, 100)
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canvas := NewBox(5, 5, 95, 95)
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taller := NewBox(-10, 5, 50, 50)
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c := canvas.OuterConstrain(box, taller)
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assert.Equal(15, c.Top, c.String())
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@ -119,7 +119,7 @@ func TestBoxOuterConstrain(t *testing.T) {
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assert.Equal(95, c.Right, c.String())
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assert.Equal(95, c.Bottom, c.String())
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wider := Box{5, 5, 110, 50}
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wider := NewBox(5, 5, 110, 50)
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d := canvas.OuterConstrain(box, wider)
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assert.Equal(5, d.Top, d.String())
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assert.Equal(5, d.Left, d.String())
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5
chart.go
5
chart.go
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@ -141,8 +141,10 @@ func (c Chart) Render(rp RendererProvider, w io.Writer) error {
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func (c Chart) checkHasVisibleSeries() error {
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hasVisibleSeries := false
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var style Style
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for _, s := range c.Series {
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hasVisibleSeries = hasVisibleSeries || (s.GetStyle().IsZero() || s.GetStyle().Show)
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style = s.GetStyle()
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hasVisibleSeries = hasVisibleSeries || (style.IsZero() || style.Show)
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}
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if !hasVisibleSeries {
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return fmt.Errorf("must have (1) visible series; make sure if you set a style, you set .Show = true")
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@ -511,6 +513,7 @@ func (c Chart) styleDefaultsCanvas() Style {
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func (c Chart) styleDefaultsSeries(seriesIndex int) Style {
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strokeColor := GetDefaultColor(seriesIndex)
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return Style{
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DotColor: strokeColor,
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StrokeColor: strokeColor,
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StrokeWidth: DefaultSeriesLineWidth,
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Font: c.GetFont(),
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@ -2,6 +2,8 @@ package chart
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import (
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"bytes"
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"image"
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"image/png"
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"math"
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"testing"
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"time"
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@ -483,3 +485,91 @@ func TestChartCheckRangesWithRanges(t *testing.T) {
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xr, yr, yra := c.getRanges()
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assert.Nil(c.checkRanges(xr, yr, yra))
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}
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func at(i image.Image, x, y int) drawing.Color {
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return drawing.ColorFromAlphaMixedRGBA(i.At(x, y).RGBA())
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}
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func TestChartE2ELine(t *testing.T) {
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assert := assert.New(t)
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c := Chart{
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Height: 50,
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Width: 50,
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Canvas: Style{
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Padding: Box{IsSet: true},
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},
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Background: Style{
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Padding: Box{IsSet: true},
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},
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Series: []Series{
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ContinuousSeries{
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XValues: Sequence.Float64(0, 4, 1),
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YValues: Sequence.Float64(0, 4, 1),
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},
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},
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}
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var buffer = &bytes.Buffer{}
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err := c.Render(PNG, buffer)
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assert.Nil(err)
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// do color tests ...
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i, err := png.Decode(buffer)
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assert.Nil(err)
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// test the bottom and top of the line
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assert.Equal(drawing.ColorWhite, at(i, 0, 0))
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assert.Equal(drawing.ColorWhite, at(i, 49, 49))
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// test a line mid point
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defaultSeriesColor := GetDefaultColor(0)
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assert.Equal(defaultSeriesColor, at(i, 0, 49))
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assert.Equal(defaultSeriesColor, at(i, 49, 0))
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assert.Equal(drawing.ColorFromHex("bddbf6"), at(i, 24, 24))
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}
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func TestChartE2ELineWithFill(t *testing.T) {
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assert := assert.New(t)
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c := Chart{
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Height: 50,
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Width: 50,
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Canvas: Style{
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Padding: Box{IsSet: true},
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},
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Background: Style{
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Padding: Box{IsSet: true},
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},
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Series: []Series{
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ContinuousSeries{
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Style: Style{
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Show: true,
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StrokeColor: drawing.ColorBlue,
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FillColor: drawing.ColorRed,
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},
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XValues: Sequence.Float64(0, 4, 1),
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YValues: Sequence.Float64(0, 4, 1),
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},
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},
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}
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var buffer = &bytes.Buffer{}
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err := c.Render(PNG, buffer)
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assert.Nil(err)
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// do color tests ...
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i, err := png.Decode(buffer)
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assert.Nil(err)
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// test the bottom and top of the line
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assert.Equal(drawing.ColorWhite, at(i, 0, 0))
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assert.Equal(drawing.ColorRed, at(i, 49, 49))
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// test a line mid point
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defaultSeriesColor := drawing.ColorBlue
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assert.Equal(defaultSeriesColor, at(i, 0, 49))
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assert.Equal(defaultSeriesColor, at(i, 49, 0))
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}
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|
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|
@ -14,6 +14,8 @@ const (
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DefaultChartWidth = 1024
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// DefaultStrokeWidth is the default chart stroke width.
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DefaultStrokeWidth = 0.0
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// DefaultDotWidth is the default chart dot width.
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DefaultDotWidth = 0.0
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// DefaultSeriesLineWidth is the default line width.
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DefaultSeriesLineWidth = 1.0
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// DefaultAxisLineWidth is the line width of the axis lines.
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|
|
24
draw.go
24
draw.go
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@ -27,9 +27,8 @@ func (d draw) LineSeries(r Renderer, canvasBox Box, xrange, yrange Range, style
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var vx, vy float64
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var x, y int
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fill := style.GetFillColor()
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if !fill.IsZero() {
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style.GetFillOptions().WriteToRenderer(r)
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if style.ShouldDrawStroke() && style.ShouldDrawFill() {
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style.GetFillOptions().WriteDrawingOptionsToRenderer(r)
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r.MoveTo(x0, y0)
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for i := 1; i < vs.Len(); i++ {
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vx, vy = vs.GetValue(i)
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@ -43,7 +42,8 @@ func (d draw) LineSeries(r Renderer, canvasBox Box, xrange, yrange Range, style
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r.Fill()
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}
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style.GetStrokeOptions().WriteToRenderer(r)
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if style.ShouldDrawStroke() {
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style.GetStrokeOptions().WriteDrawingOptionsToRenderer(r)
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r.MoveTo(x0, y0)
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for i := 1; i < vs.Len(); i++ {
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@ -53,6 +53,22 @@ func (d draw) LineSeries(r Renderer, canvasBox Box, xrange, yrange Range, style
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r.LineTo(x, y)
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}
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r.Stroke()
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}
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if style.ShouldDrawDot() {
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dotWidth := style.GetDotWidth()
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|
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style.GetDotOptions().WriteDrawingOptionsToRenderer(r)
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|
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for i := 0; i < vs.Len(); i++ {
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vx, vy = vs.GetValue(i)
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x = cl + xrange.Translate(vx)
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y = cb - yrange.Translate(vy)
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|
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r.Circle(dotWidth, x, y)
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r.FillStroke()
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}
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}
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}
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|
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// BoundedSeries draws a series that implements BoundedValueProvider.
|
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|
|
|
@ -46,12 +46,20 @@ func ColorFromHex(hex string) Color {
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return c
|
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}
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|
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// ColorFromAlphaMixedRGBA returns the system alpha mixed rgba values.
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func ColorFromAlphaMixedRGBA(r, g, b, a uint32) Color {
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fa := float64(a) / 255.0
|
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var c Color
|
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c.R = uint8(float64(r) / fa)
|
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c.G = uint8(float64(g) / fa)
|
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c.B = uint8(float64(b) / fa)
|
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c.A = uint8(a | (a >> 8))
|
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return c
|
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}
|
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|
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// Color is our internal color type because color.Color is bullshit.
|
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type Color struct {
|
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R uint8
|
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G uint8
|
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B uint8
|
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A uint8
|
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R, G, B, A uint8
|
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}
|
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|
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// RGBA returns the color as a pre-alpha mixed color set.
|
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|
@ -88,6 +96,24 @@ func (c Color) WithAlpha(a uint8) Color {
|
|||
}
|
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}
|
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|
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// Equals returns true if the color equals another.
|
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func (c Color) Equals(other Color) bool {
|
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return c.R == other.R &&
|
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c.G == other.G &&
|
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c.B == other.B &&
|
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c.A == other.A
|
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}
|
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|
||||
// AverageWith averages two colors.
|
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func (c Color) AverageWith(other Color) Color {
|
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return Color{
|
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R: (c.R + other.R) >> 1,
|
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G: (c.G + other.G) >> 1,
|
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B: (c.B + other.B) >> 1,
|
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A: c.A,
|
||||
}
|
||||
}
|
||||
|
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// String returns a css string representation of the color.
|
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func (c Color) String() string {
|
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fa := float64(c.A) / float64(255)
|
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|
|
|
@ -3,6 +3,8 @@ package drawing
|
|||
import (
|
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"testing"
|
||||
|
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"image/color"
|
||||
|
||||
"github.com/blendlabs/go-assert"
|
||||
)
|
||||
|
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|
@ -39,3 +41,13 @@ func TestColorFromHex(t *testing.T) {
|
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shortBlue := ColorFromHex("00F")
|
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assert.Equal(ColorBlue, shortBlue)
|
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}
|
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|
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func TestColorFromAlphaMixedRGBA(t *testing.T) {
|
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assert := assert.New(t)
|
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|
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black := ColorFromAlphaMixedRGBA(color.Black.RGBA())
|
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assert.True(black.Equals(ColorBlack), black.String())
|
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|
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white := ColorFromAlphaMixedRGBA(color.White.RGBA())
|
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assert.True(white.Equals(ColorWhite), white.String())
|
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}
|
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|
|
|
@ -1,8 +1,6 @@
|
|||
package drawing
|
||||
|
||||
import (
|
||||
"math"
|
||||
)
|
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import "math"
|
||||
|
||||
const (
|
||||
// CurveRecursionLimit represents the maximum recursion that is really necessary to subsivide a curve into straight lines
|
||||
|
@ -98,31 +96,60 @@ func SubdivideQuad(c, c1, c2 []float64) {
|
|||
return
|
||||
}
|
||||
|
||||
func traceWindowIndices(i int) (startAt, endAt int) {
|
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startAt = i * 6
|
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endAt = startAt + 6
|
||||
return
|
||||
}
|
||||
|
||||
func traceCalcDeltas(c []float64) (dx, dy, d float64) {
|
||||
dx = c[4] - c[0]
|
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dy = c[5] - c[1]
|
||||
d = math.Abs(((c[2]-c[4])*dy - (c[3]-c[5])*dx))
|
||||
return
|
||||
}
|
||||
|
||||
func traceIsFlat(dx, dy, d, threshold float64) bool {
|
||||
return (d * d) < threshold*(dx*dx+dy*dy)
|
||||
}
|
||||
|
||||
func traceGetWindow(curves []float64, i int) []float64 {
|
||||
startAt, endAt := traceWindowIndices(i)
|
||||
return curves[startAt:endAt]
|
||||
}
|
||||
|
||||
// TraceQuad generate lines subdividing the curve using a Liner
|
||||
// flattening_threshold helps determines the flattening expectation of the curve
|
||||
func TraceQuad(t Liner, quad []float64, flatteningThreshold float64) {
|
||||
const curveLen = CurveRecursionLimit * 6
|
||||
const curveEndIndex = curveLen - 1
|
||||
const lastIteration = CurveRecursionLimit - 1
|
||||
|
||||
// Allocates curves stack
|
||||
var curves [CurveRecursionLimit * 6]float64
|
||||
curves := make([]float64, curveLen)
|
||||
|
||||
// copy 6 elements from the quad path to the stack
|
||||
copy(curves[0:6], quad[0:6])
|
||||
i := 0
|
||||
// current curve
|
||||
|
||||
var i int
|
||||
var c []float64
|
||||
var dx, dy, d float64
|
||||
|
||||
for i >= 0 {
|
||||
c = curves[i*6:]
|
||||
dx = c[4] - c[0]
|
||||
dy = c[5] - c[1]
|
||||
c = traceGetWindow(curves, i)
|
||||
dx, dy, d = traceCalcDeltas(c)
|
||||
|
||||
d = math.Abs(((c[2]-c[4])*dy - (c[3]-c[5])*dx))
|
||||
// bail early if the distance is 0
|
||||
if d == 0 {
|
||||
return
|
||||
}
|
||||
|
||||
// if it's flat then trace a line
|
||||
if (d*d) < flatteningThreshold*(dx*dx+dy*dy) || i == len(curves)-1 {
|
||||
if traceIsFlat(dx, dy, d, flatteningThreshold) || i == lastIteration {
|
||||
t.LineTo(c[4], c[5])
|
||||
i--
|
||||
} else {
|
||||
// second half of bezier go lower onto the stack
|
||||
SubdivideQuad(c, curves[(i+1)*6:], curves[i*6:])
|
||||
SubdivideQuad(c, traceGetWindow(curves, i+1), traceGetWindow(curves, i))
|
||||
i++
|
||||
}
|
||||
}
|
||||
|
|
35
drawing/curve_test.go
Normal file
35
drawing/curve_test.go
Normal file
|
@ -0,0 +1,35 @@
|
|||
package drawing
|
||||
|
||||
import (
|
||||
"testing"
|
||||
|
||||
assert "github.com/blendlabs/go-assert"
|
||||
)
|
||||
|
||||
type point struct {
|
||||
X, Y float64
|
||||
}
|
||||
|
||||
type mockLine struct {
|
||||
inner []point
|
||||
}
|
||||
|
||||
func (ml *mockLine) LineTo(x, y float64) {
|
||||
ml.inner = append(ml.inner, point{x, y})
|
||||
}
|
||||
|
||||
func (ml mockLine) Len() int {
|
||||
return len(ml.inner)
|
||||
}
|
||||
|
||||
func TestTraceQuad(t *testing.T) {
|
||||
assert := assert.New(t)
|
||||
|
||||
// Quad
|
||||
// x1, y1, cpx1, cpy2, x2, y2 float64
|
||||
// do the 9->12 circle segment
|
||||
quad := []float64{10, 20, 20, 20, 20, 10}
|
||||
liner := &mockLine{}
|
||||
TraceQuad(liner, quad, 0.5)
|
||||
assert.NotZero(liner.Len())
|
||||
}
|
|
@ -23,10 +23,10 @@ type Flattener interface {
|
|||
// Flatten convert curves into straight segments keeping join segments info
|
||||
func Flatten(path *Path, flattener Flattener, scale float64) {
|
||||
// First Point
|
||||
var startX, startY float64 = 0, 0
|
||||
var startX, startY float64
|
||||
// Current Point
|
||||
var x, y float64 = 0, 0
|
||||
i := 0
|
||||
var x, y float64
|
||||
var i int
|
||||
for _, cmp := range path.Components {
|
||||
switch cmp {
|
||||
case MoveToComponent:
|
||||
|
@ -43,6 +43,7 @@ func Flatten(path *Path, flattener Flattener, scale float64) {
|
|||
flattener.LineJoin()
|
||||
i += 2
|
||||
case QuadCurveToComponent:
|
||||
// we include the previous point for the start of the curve
|
||||
TraceQuad(flattener, path.Points[i-2:], 0.5)
|
||||
x, y = path.Points[i+2], path.Points[i+3]
|
||||
flattener.LineTo(x, y)
|
||||
|
|
|
@ -49,7 +49,9 @@ func (lrs LinearRegressionSeries) GetWindow() int {
|
|||
|
||||
// GetEndIndex returns the effective window end.
|
||||
func (lrs LinearRegressionSeries) GetEndIndex() int {
|
||||
return Math.MinInt(lrs.GetOffset()+(lrs.Len()), (lrs.InnerSeries.Len() - 1))
|
||||
offset := lrs.GetOffset() + lrs.Len()
|
||||
innerSeriesLastIndex := lrs.InnerSeries.Len() - 1
|
||||
return Math.MinInt(offset, innerSeriesLastIndex)
|
||||
}
|
||||
|
||||
// GetOffset returns the data offset.
|
||||
|
@ -62,7 +64,7 @@ func (lrs LinearRegressionSeries) GetOffset() int {
|
|||
|
||||
// GetValue gets a value at a given index.
|
||||
func (lrs *LinearRegressionSeries) GetValue(index int) (x, y float64) {
|
||||
if lrs.InnerSeries == nil {
|
||||
if lrs.InnerSeries == nil || lrs.InnerSeries.Len() == 0 {
|
||||
return
|
||||
}
|
||||
if lrs.m == 0 && lrs.b == 0 {
|
||||
|
@ -78,7 +80,7 @@ func (lrs *LinearRegressionSeries) GetValue(index int) (x, y float64) {
|
|||
// GetLastValue computes the last moving average value but walking back window size samples,
|
||||
// and recomputing the last moving average chunk.
|
||||
func (lrs *LinearRegressionSeries) GetLastValue() (x, y float64) {
|
||||
if lrs.InnerSeries == nil {
|
||||
if lrs.InnerSeries == nil || lrs.InnerSeries.Len() == 0 {
|
||||
return
|
||||
}
|
||||
if lrs.m == 0 && lrs.b == 0 {
|
||||
|
|
|
@ -27,6 +27,24 @@ type MACDSeries struct {
|
|||
macdl *MACDLineSeries
|
||||
}
|
||||
|
||||
// Validate validates the series.
|
||||
func (macd MACDSeries) Validate() error {
|
||||
var err error
|
||||
if macd.signal != nil {
|
||||
err = macd.signal.Validate()
|
||||
}
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
if macd.macdl != nil {
|
||||
err = macd.macdl.Validate()
|
||||
}
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
// GetPeriods returns the primary and secondary periods.
|
||||
func (macd MACDSeries) GetPeriods() (w1, w2, sig int) {
|
||||
if macd.PrimaryPeriod == 0 {
|
||||
|
@ -121,6 +139,14 @@ type MACDSignalSeries struct {
|
|||
signal *EMASeries
|
||||
}
|
||||
|
||||
// Validate validates the series.
|
||||
func (macds MACDSignalSeries) Validate() error {
|
||||
if macds.signal != nil {
|
||||
return macds.signal.Validate()
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
// GetPeriods returns the primary and secondary periods.
|
||||
func (macds MACDSignalSeries) GetPeriods() (w1, w2, sig int) {
|
||||
if macds.PrimaryPeriod == 0 {
|
||||
|
@ -214,6 +240,27 @@ type MACDLineSeries struct {
|
|||
Sigma float64
|
||||
}
|
||||
|
||||
// Validate validates the series.
|
||||
func (macdl MACDLineSeries) Validate() error {
|
||||
var err error
|
||||
if macdl.ema1 != nil {
|
||||
err = macdl.ema1.Validate()
|
||||
}
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
if macdl.ema2 != nil {
|
||||
err = macdl.ema2.Validate()
|
||||
}
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
if macdl.InnerSeries == nil {
|
||||
return fmt.Errorf("MACDLineSeries: must provide an inner series")
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
// GetName returns the name of the time series.
|
||||
func (macdl MACDLineSeries) GetName() string {
|
||||
return macdl.Name
|
||||
|
@ -289,11 +336,3 @@ func (macdl *MACDLineSeries) Render(r Renderer, canvasBox Box, xrange, yrange Ra
|
|||
style := macdl.Style.InheritFrom(defaults)
|
||||
Draw.LineSeries(r, canvasBox, xrange, yrange, style, macdl)
|
||||
}
|
||||
|
||||
// Validate validates the series.
|
||||
func (macdl *MACDLineSeries) Validate() error {
|
||||
if macdl.InnerSeries == nil {
|
||||
return fmt.Errorf("macd line series requires InnerSeries to be set")
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
|
|
@ -116,17 +116,16 @@ func (rr *rasterRenderer) FillStroke() {
|
|||
rr.gc.FillStroke()
|
||||
}
|
||||
|
||||
// Circle implements the interface method.
|
||||
// Circle fully draws a circle at a given point but does not apply the fill or stroke.
|
||||
func (rr *rasterRenderer) Circle(radius float64, x, y int) {
|
||||
xf := float64(x)
|
||||
yf := float64(y)
|
||||
|
||||
rr.gc.MoveTo(xf-radius, yf) //9
|
||||
rr.gc.QuadCurveTo(xf, yf, xf, yf-radius) //12
|
||||
rr.gc.QuadCurveTo(xf, yf, xf+radius, yf) //3
|
||||
rr.gc.QuadCurveTo(xf, yf, xf, yf+radius) //6
|
||||
rr.gc.QuadCurveTo(xf, yf, xf-radius, yf) //9
|
||||
rr.gc.Close()
|
||||
rr.gc.FillStroke()
|
||||
rr.gc.QuadCurveTo(xf-radius, yf-radius, xf, yf-radius) //12
|
||||
rr.gc.QuadCurveTo(xf+radius, yf-radius, xf+radius, yf) //3
|
||||
rr.gc.QuadCurveTo(xf+radius, yf+radius, xf, yf+radius) //6
|
||||
rr.gc.QuadCurveTo(xf-radius, yf+radius, xf-radius, yf) //9
|
||||
}
|
||||
|
||||
// SetFont implements the interface method.
|
||||
|
|
14
sequence.go
14
sequence.go
|
@ -8,10 +8,14 @@ import (
|
|||
var (
|
||||
// Sequence contains some sequence utilities.
|
||||
// These utilities can be useful for generating test data.
|
||||
Sequence = &sequence{}
|
||||
Sequence = &sequence{
|
||||
rnd: rand.New(rand.NewSource(time.Now().Unix())),
|
||||
}
|
||||
)
|
||||
|
||||
type sequence struct{}
|
||||
type sequence struct {
|
||||
rnd *rand.Rand
|
||||
}
|
||||
|
||||
// Float64 produces an array of floats from [start,end] by optional steps.
|
||||
func (s sequence) Float64(start, end float64, steps ...float64) []float64 {
|
||||
|
@ -35,11 +39,10 @@ func (s sequence) Float64(start, end float64, steps ...float64) []float64 {
|
|||
|
||||
// Random generates a fixed length sequence of random values between (0, scale).
|
||||
func (s sequence) Random(samples int, scale float64) []float64 {
|
||||
rnd := rand.New(rand.NewSource(time.Now().Unix()))
|
||||
values := make([]float64, samples)
|
||||
|
||||
for x := 0; x < samples; x++ {
|
||||
values[x] = rnd.Float64() * scale
|
||||
values[x] = s.rnd.Float64() * scale
|
||||
}
|
||||
|
||||
return values
|
||||
|
@ -47,11 +50,10 @@ func (s sequence) Random(samples int, scale float64) []float64 {
|
|||
|
||||
// Random generates a fixed length sequence of random values with a given average, above and below that average by (-scale, scale)
|
||||
func (s sequence) RandomWithAverage(samples int, average, scale float64) []float64 {
|
||||
rnd := rand.New(rand.NewSource(time.Now().Unix()))
|
||||
values := make([]float64, samples)
|
||||
|
||||
for x := 0; x < samples; x++ {
|
||||
jitter := scale - (rnd.Float64() * (2 * scale))
|
||||
jitter := scale - (s.rnd.Float64() * (2 * scale))
|
||||
values[x] = average + jitter
|
||||
}
|
||||
|
||||
|
|
|
@ -50,7 +50,7 @@ func (sma SMASeries) GetPeriod(defaults ...int) int {
|
|||
|
||||
// GetValue gets a value at a given index.
|
||||
func (sma SMASeries) GetValue(index int) (x, y float64) {
|
||||
if sma.InnerSeries == nil {
|
||||
if sma.InnerSeries == nil || sma.InnerSeries.Len() == 0 {
|
||||
return
|
||||
}
|
||||
px, _ := sma.InnerSeries.GetValue(index)
|
||||
|
@ -62,7 +62,7 @@ func (sma SMASeries) GetValue(index int) (x, y float64) {
|
|||
// GetLastValue computes the last moving average value but walking back window size samples,
|
||||
// and recomputing the last moving average chunk.
|
||||
func (sma SMASeries) GetLastValue() (x, y float64) {
|
||||
if sma.InnerSeries == nil {
|
||||
if sma.InnerSeries == nil || sma.InnerSeries.Len() == 0 {
|
||||
return
|
||||
}
|
||||
seriesLen := sma.InnerSeries.Len()
|
||||
|
|
83
style.go
83
style.go
|
@ -8,6 +8,12 @@ import (
|
|||
"github.com/wcharczuk/go-chart/drawing"
|
||||
)
|
||||
|
||||
const (
|
||||
// Disabled indicates if the value should be interpreted as set intentionally to zero.
|
||||
// this is because golang optionals aren't here yet.
|
||||
Disabled = -1
|
||||
)
|
||||
|
||||
// StyleShow is a prebuilt style with the `Show` property set to true.
|
||||
func StyleShow() Style {
|
||||
return Style{
|
||||
|
@ -24,7 +30,11 @@ type Style struct {
|
|||
StrokeColor drawing.Color
|
||||
StrokeDashArray []float64
|
||||
|
||||
DotColor drawing.Color
|
||||
DotWidth float64
|
||||
|
||||
FillColor drawing.Color
|
||||
|
||||
FontSize float64
|
||||
FontColor drawing.Color
|
||||
Font *truetype.Font
|
||||
|
@ -38,7 +48,14 @@ type Style struct {
|
|||
|
||||
// IsZero returns if the object is set or not.
|
||||
func (s Style) IsZero() bool {
|
||||
return s.StrokeColor.IsZero() && s.FillColor.IsZero() && s.StrokeWidth == 0 && s.FontColor.IsZero() && s.FontSize == 0 && s.Font == nil
|
||||
return s.StrokeColor.IsZero() &&
|
||||
s.StrokeWidth == 0 &&
|
||||
s.DotColor.IsZero() &&
|
||||
s.DotWidth == 0 &&
|
||||
s.FillColor.IsZero() &&
|
||||
s.FontColor.IsZero() &&
|
||||
s.FontSize == 0 &&
|
||||
s.Font == nil
|
||||
}
|
||||
|
||||
// String returns a text representation of the style.
|
||||
|
@ -83,6 +100,18 @@ func (s Style) String() string {
|
|||
output = append(output, "\"stroke_dash_array\": null")
|
||||
}
|
||||
|
||||
if s.DotWidth >= 0 {
|
||||
output = append(output, fmt.Sprintf("\"dot_width\": %0.2f", s.DotWidth))
|
||||
} else {
|
||||
output = append(output, "\"dot_width\": null")
|
||||
}
|
||||
|
||||
if !s.DotColor.IsZero() {
|
||||
output = append(output, fmt.Sprintf("\"dot_color\": %s", s.DotColor.String()))
|
||||
} else {
|
||||
output = append(output, "\"dot_color\": null")
|
||||
}
|
||||
|
||||
if !s.FillColor.IsZero() {
|
||||
output = append(output, fmt.Sprintf("\"fill_color\": %s", s.FillColor.String()))
|
||||
} else {
|
||||
|
@ -132,6 +161,17 @@ func (s Style) GetFillColor(defaults ...drawing.Color) drawing.Color {
|
|||
return s.FillColor
|
||||
}
|
||||
|
||||
// GetDotColor returns the stroke color.
|
||||
func (s Style) GetDotColor(defaults ...drawing.Color) drawing.Color {
|
||||
if s.DotColor.IsZero() {
|
||||
if len(defaults) > 0 {
|
||||
return defaults[0]
|
||||
}
|
||||
return drawing.ColorTransparent
|
||||
}
|
||||
return s.DotColor
|
||||
}
|
||||
|
||||
// GetStrokeWidth returns the stroke width.
|
||||
func (s Style) GetStrokeWidth(defaults ...float64) float64 {
|
||||
if s.StrokeWidth == 0 {
|
||||
|
@ -143,6 +183,17 @@ func (s Style) GetStrokeWidth(defaults ...float64) float64 {
|
|||
return s.StrokeWidth
|
||||
}
|
||||
|
||||
// GetDotWidth returns the dot width for scatter plots.
|
||||
func (s Style) GetDotWidth(defaults ...float64) float64 {
|
||||
if s.DotWidth == 0 {
|
||||
if len(defaults) > 0 {
|
||||
return defaults[0]
|
||||
}
|
||||
return DefaultDotWidth
|
||||
}
|
||||
return s.DotWidth
|
||||
}
|
||||
|
||||
// GetStrokeDashArray returns the stroke dash array.
|
||||
func (s Style) GetStrokeDashArray(defaults ...[]float64) []float64 {
|
||||
if len(s.StrokeDashArray) == 0 {
|
||||
|
@ -288,6 +339,10 @@ func (s Style) InheritFrom(defaults Style) (final Style) {
|
|||
final.StrokeColor = s.GetStrokeColor(defaults.StrokeColor)
|
||||
final.StrokeWidth = s.GetStrokeWidth(defaults.StrokeWidth)
|
||||
final.StrokeDashArray = s.GetStrokeDashArray(defaults.StrokeDashArray)
|
||||
|
||||
final.DotColor = s.GetDotColor(defaults.DotColor)
|
||||
final.DotWidth = s.GetDotWidth(defaults.DotWidth)
|
||||
|
||||
final.FillColor = s.GetFillColor(defaults.FillColor)
|
||||
final.FontColor = s.GetFontColor(defaults.FontColor)
|
||||
final.FontSize = s.GetFontSize(defaults.FontSize)
|
||||
|
@ -298,6 +353,7 @@ func (s Style) InheritFrom(defaults Style) (final Style) {
|
|||
final.TextWrap = s.GetTextWrap(defaults.TextWrap)
|
||||
final.TextLineSpacing = s.GetTextLineSpacing(defaults.TextLineSpacing)
|
||||
final.TextRotationDegrees = s.GetTextRotationDegrees(defaults.TextRotationDegrees)
|
||||
|
||||
return
|
||||
}
|
||||
|
||||
|
@ -317,6 +373,16 @@ func (s Style) GetFillOptions() Style {
|
|||
}
|
||||
}
|
||||
|
||||
// GetDotOptions returns the dot components.
|
||||
func (s Style) GetDotOptions() Style {
|
||||
return Style{
|
||||
StrokeDashArray: nil,
|
||||
FillColor: s.DotColor,
|
||||
StrokeColor: s.DotColor,
|
||||
StrokeWidth: 1.0,
|
||||
}
|
||||
}
|
||||
|
||||
// GetFillAndStrokeOptions returns the fill and stroke components.
|
||||
func (s Style) GetFillAndStrokeOptions() Style {
|
||||
return Style{
|
||||
|
@ -340,3 +406,18 @@ func (s Style) GetTextOptions() Style {
|
|||
TextRotationDegrees: s.TextRotationDegrees,
|
||||
}
|
||||
}
|
||||
|
||||
// ShouldDrawStroke tells drawing functions if they should draw the stroke.
|
||||
func (s Style) ShouldDrawStroke() bool {
|
||||
return !s.StrokeColor.IsZero() && s.StrokeWidth > 0
|
||||
}
|
||||
|
||||
// ShouldDrawDot tells drawing functions if they should draw the dot.
|
||||
func (s Style) ShouldDrawDot() bool {
|
||||
return !s.DotColor.IsZero() && s.DotWidth > 0
|
||||
}
|
||||
|
||||
// ShouldDrawFill tells drawing functions if they should draw the stroke.
|
||||
func (s Style) ShouldDrawFill() bool {
|
||||
return !s.FillColor.IsZero()
|
||||
}
|
||||
|
|
|
@ -61,7 +61,7 @@ func TestXAxisMeasure(t *testing.T) {
|
|||
assert.Nil(err)
|
||||
ticks := []Tick{{Value: 1.0, Label: "1.0"}, {Value: 2.0, Label: "2.0"}, {Value: 3.0, Label: "3.0"}}
|
||||
xa := XAxis{}
|
||||
xab := xa.Measure(r, Box{0, 0, 100, 100}, &ContinuousRange{Min: 1.0, Max: 3.0, Domain: 100}, style, ticks)
|
||||
xab := xa.Measure(r, NewBox(0, 0, 100, 100), &ContinuousRange{Min: 1.0, Max: 3.0, Domain: 100}, style, ticks)
|
||||
assert.Equal(122, xab.Width())
|
||||
assert.Equal(21, xab.Height())
|
||||
}
|
||||
|
|
|
@ -61,7 +61,7 @@ func TestYAxisMeasure(t *testing.T) {
|
|||
assert.Nil(err)
|
||||
ticks := []Tick{{Value: 1.0, Label: "1.0"}, {Value: 2.0, Label: "2.0"}, {Value: 3.0, Label: "3.0"}}
|
||||
ya := YAxis{}
|
||||
yab := ya.Measure(r, Box{0, 0, 100, 100}, &ContinuousRange{Min: 1.0, Max: 3.0, Domain: 100}, style, ticks)
|
||||
yab := ya.Measure(r, NewBox(0, 0, 100, 100), &ContinuousRange{Min: 1.0, Max: 3.0, Domain: 100}, style, ticks)
|
||||
assert.Equal(32, yab.Width())
|
||||
assert.Equal(110, yab.Height())
|
||||
}
|
||||
|
@ -79,7 +79,7 @@ func TestYAxisSecondaryMeasure(t *testing.T) {
|
|||
assert.Nil(err)
|
||||
ticks := []Tick{{Value: 1.0, Label: "1.0"}, {Value: 2.0, Label: "2.0"}, {Value: 3.0, Label: "3.0"}}
|
||||
ya := YAxis{AxisType: YAxisSecondary}
|
||||
yab := ya.Measure(r, Box{0, 0, 100, 100}, &ContinuousRange{Min: 1.0, Max: 3.0, Domain: 100}, style, ticks)
|
||||
yab := ya.Measure(r, NewBox(0, 0, 100, 100), &ContinuousRange{Min: 1.0, Max: 3.0, Domain: 100}, style, ticks)
|
||||
assert.Equal(32, yab.Width())
|
||||
assert.Equal(110, yab.Height())
|
||||
}
|
||||
|
|
Loading…
Reference in a new issue