37 lines
1.1 KiB
Go
37 lines
1.1 KiB
Go
package chart
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import "fmt"
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// FirstValueAnnotation returns an annotation series of just the first value of a value provider as an annotation.
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func FirstValueAnnotation(innerSeries ValuesProvider, 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 firstValue Value2
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if typed, isTyped := innerSeries.(FirstValuesProvider); isTyped {
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firstValue.XValue, firstValue.YValue = typed.GetFirstValues()
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firstValue.Label = vf(firstValue.YValue)
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} else {
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firstValue.XValue, firstValue.YValue = innerSeries.GetValues(0)
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firstValue.Label = vf(firstValue.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 - First 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{firstValue},
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}
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}
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