last annotation helper
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3 changed files with 217 additions and 0 deletions
61
examples/min_max/main.go
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61
examples/min_max/main.go
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package main
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import (
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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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mainSeries := chart.ContinuousSeries{
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Name: "A test series",
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XValues: chart.Sequence.Float64(1.0, 100.0),
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YValues: chart.Sequence.RandomWithAverage(100, 100, 50),
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}
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minSeries := &chart.MinSeries{
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Style: chart.Style{
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Show: true,
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StrokeColor: chart.ColorAlternateGray,
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StrokeDashArray: []float64{5.0, 5.0},
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},
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InnerSeries: mainSeries,
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}
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maxSeries := &chart.MaxSeries{
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Style: chart.Style{
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Show: true,
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StrokeColor: chart.ColorAlternateGray,
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StrokeDashArray: []float64{5.0, 5.0},
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},
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InnerSeries: mainSeries,
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}
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graph := chart.Chart{
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YAxis: chart.YAxis{
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Style: chart.StyleShow(),
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Range: &chart.ContinuousRange{
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Min: 25,
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Max: 175,
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},
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},
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XAxis: chart.XAxis{
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Style: chart.StyleShow(),
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},
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Series: []chart.Series{
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mainSeries,
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minSeries,
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maxSeries,
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chart.LastValueAnnotation(minSeries),
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chart.LastValueAnnotation(maxSeries),
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},
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}
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res.Header().Set("Content-Type", "image/png")
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graph.Render(chart.PNG, res)
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}
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func main() {
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http.HandleFunc("/", drawChart)
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http.ListenAndServe(":8080", nil)
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}
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37
last_value_annotation_series.go
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37
last_value_annotation_series.go
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package chart
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import "fmt"
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// LastValueAnnotation returns an annotation series of just the last value of a value provider.
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func LastValueAnnotation(innerSeries ValueProvider, vfs ...ValueFormatter) AnnotationSeries {
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var vf ValueFormatter
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if len(vfs) > 0 {
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vf = vfs[0]
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} else if typed, isTyped := innerSeries.(ValueFormatterProvider); isTyped {
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_, vf = typed.GetValueFormatters()
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} else {
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vf = FloatValueFormatter
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}
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var lastValue Value2
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if typed, isTyped := innerSeries.(LastValueProvider); isTyped {
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lastValue.XValue, lastValue.YValue = typed.GetLastValue()
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lastValue.Label = vf(lastValue.YValue)
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} else {
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lastValue.XValue, lastValue.YValue = innerSeries.GetValue(innerSeries.Len() - 1)
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lastValue.Label = vf(lastValue.YValue)
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}
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var seriesName string
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var seriesStyle Style
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if typed, isTyped := innerSeries.(Series); isTyped {
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seriesName = fmt.Sprintf("%s - Last Value", typed.GetName())
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seriesStyle = typed.GetStyle()
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}
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return AnnotationSeries{
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Name: seriesName,
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Style: seriesStyle,
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Annotations: []Value2{lastValue},
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}
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}
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119
min_max_series.go
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119
min_max_series.go
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package chart
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import "math"
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// MinSeries draws a horizontal line at the minimum value of the inner series.
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type MinSeries struct {
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Name string
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Style Style
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YAxis YAxisType
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InnerSeries ValueProvider
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minValue *float64
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}
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// GetName returns the name of the time series.
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func (ms MinSeries) GetName() string {
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return ms.Name
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}
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// GetStyle returns the line style.
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func (ms MinSeries) GetStyle() Style {
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return ms.Style
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}
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// GetYAxis returns which YAxis the series draws on.
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func (ms MinSeries) GetYAxis() YAxisType {
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return ms.YAxis
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}
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// Len returns the number of elements in the series.
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func (ms MinSeries) Len() int {
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return ms.InnerSeries.Len()
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}
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// GetValue gets a value at a given index.
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func (ms *MinSeries) GetValue(index int) (x, y float64) {
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ms.ensureMinValue()
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x, _ = ms.InnerSeries.GetValue(index)
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y = *ms.minValue
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return
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}
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// Render renders the series.
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func (ms *MinSeries) Render(r Renderer, canvasBox Box, xrange, yrange Range, defaults Style) {
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style := ms.Style.InheritFrom(defaults)
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Draw.LineSeries(r, canvasBox, xrange, yrange, style, ms)
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}
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func (ms *MinSeries) ensureMinValue() {
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if ms.minValue == nil {
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minValue := math.MaxFloat64
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var y float64
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for x := 0; x < ms.InnerSeries.Len(); x++ {
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_, y = ms.InnerSeries.GetValue(x)
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if y < minValue {
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minValue = y
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}
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}
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ms.minValue = &minValue
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}
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}
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// MaxSeries draws a horizontal line at the maximum value of the inner series.
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type MaxSeries struct {
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Name string
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Style Style
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YAxis YAxisType
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InnerSeries ValueProvider
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maxValue *float64
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}
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// GetName returns the name of the time series.
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func (ms MaxSeries) GetName() string {
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return ms.Name
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}
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// GetStyle returns the line style.
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func (ms MaxSeries) GetStyle() Style {
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return ms.Style
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}
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// GetYAxis returns which YAxis the series draws on.
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func (ms MaxSeries) GetYAxis() YAxisType {
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return ms.YAxis
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}
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// Len returns the number of elements in the series.
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func (ms MaxSeries) Len() int {
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return ms.InnerSeries.Len()
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}
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// GetValue gets a value at a given index.
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func (ms *MaxSeries) GetValue(index int) (x, y float64) {
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ms.ensureMaxValue()
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x, _ = ms.InnerSeries.GetValue(index)
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y = *ms.maxValue
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return
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}
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// Render renders the series.
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func (ms *MaxSeries) Render(r Renderer, canvasBox Box, xrange, yrange Range, defaults Style) {
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style := ms.Style.InheritFrom(defaults)
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Draw.LineSeries(r, canvasBox, xrange, yrange, style, ms)
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}
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func (ms *MaxSeries) ensureMaxValue() {
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if ms.maxValue == nil {
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maxValue := -math.MaxFloat64
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var y float64
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for x := 0; x < ms.InnerSeries.Len(); x++ {
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_, y = ms.InnerSeries.GetValue(x)
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if y > maxValue {
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maxValue = y
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}
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}
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ms.maxValue = &maxValue
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}
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}
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