go-chart/time_series.go

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package chart
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import (
"fmt"
"time"
util "github.com/wcharczuk/go-chart/util"
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)
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// Interface Assertions.
var (
_ Series = (*TimeSeries)(nil)
_ FirstValuesProvider = (*TimeSeries)(nil)
_ LastValuesProvider = (*TimeSeries)(nil)
_ ValueFormatterProvider = (*TimeSeries)(nil)
)
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// TimeSeries is a line on a chart.
type TimeSeries struct {
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Name string
Style Style
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YAxis YAxisType
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XValues []time.Time
YValues []float64
}
// GetName returns the name of the time series.
func (ts TimeSeries) GetName() string {
return ts.Name
}
// GetStyle returns the line style.
func (ts TimeSeries) GetStyle() Style {
return ts.Style
}
// Len returns the number of elements in the series.
func (ts TimeSeries) Len() int {
return len(ts.XValues)
}
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// GetValues gets x, y values at a given index.
func (ts TimeSeries) GetValues(index int) (x, y float64) {
x = util.Time.ToFloat64(ts.XValues[index])
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y = ts.YValues[index]
return
}
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// GetFirstValues gets the first values.
func (ts TimeSeries) GetFirstValues() (x, y float64) {
x = util.Time.ToFloat64(ts.XValues[0])
y = ts.YValues[0]
return
}
// GetLastValues gets the last values.
func (ts TimeSeries) GetLastValues() (x, y float64) {
x = util.Time.ToFloat64(ts.XValues[len(ts.XValues)-1])
y = ts.YValues[len(ts.YValues)-1]
return
}
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// GetValueFormatters returns value formatter defaults for the series.
func (ts TimeSeries) GetValueFormatters() (x, y ValueFormatter) {
x = TimeValueFormatter
y = FloatValueFormatter
return
}
// GetYAxis returns which YAxis the series draws on.
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func (ts TimeSeries) GetYAxis() YAxisType {
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return ts.YAxis
}
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// Render renders the series.
func (ts TimeSeries) Render(r Renderer, canvasBox Box, xrange, yrange Range, defaults Style) {
style := ts.Style.InheritFrom(defaults)
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Draw.LineSeries(r, canvasBox, xrange, yrange, style, ts)
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}
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// Validate validates the series.
func (ts TimeSeries) Validate() error {
if len(ts.XValues) == 0 {
return fmt.Errorf("time series must have xvalues set")
}
if len(ts.YValues) == 0 {
return fmt.Errorf("time series must have yvalues set")
}
return nil
}