68 lines
1.7 KiB
Go
68 lines
1.7 KiB
Go
package chart
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import "fmt"
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// HistogramSeries is a special type of series that draws as a histogram.
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// Some peculiarities; it will always be lower bounded at 0 (at the very least).
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// This may alter ranges a bit and generally you want to put a histogram series on it's own y-axis.
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type HistogramSeries struct {
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Name string
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Style Style
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YAxis YAxisType
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InnerSeries ValuesProvider
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}
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// GetName implements Series.GetName.
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func (hs HistogramSeries) GetName() string {
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return hs.Name
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}
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// GetStyle implements Series.GetStyle.
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func (hs HistogramSeries) GetStyle() Style {
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return hs.Style
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}
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// GetYAxis returns which yaxis the series is mapped to.
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func (hs HistogramSeries) GetYAxis() YAxisType {
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return hs.YAxis
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}
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// Len implements BoundedValuesProvider.Len.
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func (hs HistogramSeries) Len() int {
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return hs.InnerSeries.Len()
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}
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// GetValues implements ValuesProvider.GetValues.
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func (hs HistogramSeries) GetValues(index int) (x, y float64) {
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return hs.InnerSeries.GetValues(index)
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}
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// GetBoundedValues implements BoundedValuesProvider.GetBoundedValue
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func (hs HistogramSeries) GetBoundedValues(index int) (x, y1, y2 float64) {
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vx, vy := hs.InnerSeries.GetValues(index)
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x = vx
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if vy > 0 {
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y1 = vy
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return
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}
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y2 = vy
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return
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}
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// Render implements Series.Render.
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func (hs HistogramSeries) Render(r Renderer, canvasBox Box, xrange, yrange Range, defaults Style) {
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style := hs.Style.InheritFrom(defaults)
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Draw.HistogramSeries(r, canvasBox, xrange, yrange, style, hs)
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}
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// Validate validates the series.
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func (hs HistogramSeries) Validate() error {
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if hs.InnerSeries == nil {
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return fmt.Errorf("histogram series requires InnerSeries to be set")
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}
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return nil
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}
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