37 lines
1.1 KiB
Go
37 lines
1.1 KiB
Go
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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