go-chart/time_series.go
2017-02-03 11:26:53 -08:00

77 lines
1.6 KiB
Go

package chart
import (
"fmt"
"time"
)
// TimeSeries is a line on a chart.
type TimeSeries struct {
Name string
Style Style
YAxis YAxisType
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)
}
// GetValue gets a value at a given index.
func (ts TimeSeries) GetValue(index int) (x, y float64) {
x = Time.ToFloat64(ts.XValues[index])
y = ts.YValues[index]
return
}
// GetLastValue gets the last value.
func (ts TimeSeries) GetLastValue() (x, y float64) {
x = Time.ToFloat64(ts.XValues[len(ts.XValues)-1])
y = ts.YValues[len(ts.YValues)-1]
return
}
// 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.
func (ts TimeSeries) GetYAxis() YAxisType {
return ts.YAxis
}
// Render renders the series.
func (ts TimeSeries) Render(r Renderer, canvasBox Box, xrange, yrange Range, defaults Style) {
style := ts.Style.InheritFrom(defaults)
Draw.LineSeries(r, canvasBox, xrange, yrange, style, ts)
}
// 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
}