91 lines
2 KiB
Go
91 lines
2 KiB
Go
package chart
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import (
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"fmt"
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"time"
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)
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// Interface Assertions.
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var (
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_ Series = (*TimeSeries)(nil)
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_ FirstValuesProvider = (*TimeSeries)(nil)
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_ LastValuesProvider = (*TimeSeries)(nil)
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_ ValueFormatterProvider = (*TimeSeries)(nil)
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)
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// TimeSeries is a line on a chart.
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type TimeSeries struct {
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Name string
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Style Style
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YAxis YAxisType
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XValues []time.Time
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YValues []float64
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}
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// GetName returns the name of the time series.
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func (ts TimeSeries) GetName() string {
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return ts.Name
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}
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// GetStyle returns the line style.
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func (ts TimeSeries) GetStyle() Style {
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return ts.Style
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}
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// Len returns the number of elements in the series.
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func (ts TimeSeries) Len() int {
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return len(ts.XValues)
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}
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// GetValues gets x, y values at a given index.
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func (ts TimeSeries) GetValues(index int) (x, y float64) {
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x = TimeToFloat64(ts.XValues[index])
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y = ts.YValues[index]
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return
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}
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// GetFirstValues gets the first values.
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func (ts TimeSeries) GetFirstValues() (x, y float64) {
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x = TimeToFloat64(ts.XValues[0])
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y = ts.YValues[0]
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return
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}
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// GetLastValues gets the last values.
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func (ts TimeSeries) GetLastValues() (x, y float64) {
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x = TimeToFloat64(ts.XValues[len(ts.XValues)-1])
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y = ts.YValues[len(ts.YValues)-1]
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return
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}
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// GetValueFormatters returns value formatter defaults for the series.
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func (ts TimeSeries) GetValueFormatters() (x, y ValueFormatter) {
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x = TimeValueFormatter
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y = FloatValueFormatter
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return
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}
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// 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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}
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// Render renders the series.
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func (ts TimeSeries) Render(r Renderer, canvasBox Box, xrange, yrange Range, defaults Style) {
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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.
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func (ts TimeSeries) Validate() error {
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if len(ts.XValues) == 0 {
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return fmt.Errorf("time series must have xvalues set")
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}
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if len(ts.YValues) == 0 {
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return fmt.Errorf("time series must have yvalues set")
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}
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return nil
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}
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