139 lines
3.0 KiB
Go
139 lines
3.0 KiB
Go
package chart
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import (
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"fmt"
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"math"
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)
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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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// Validate validates the series.
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func (ms *MinSeries) Validate() error {
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if ms.InnerSeries == nil {
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return fmt.Errorf("min series requires InnerSeries to be set")
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}
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return nil
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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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// Validate validates the series.
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func (ms *MaxSeries) Validate() error {
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if ms.InnerSeries == nil {
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return fmt.Errorf("max series requires InnerSeries to be set")
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}
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return nil
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}
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