package chart import ( "fmt" "time" util "github.com/wcharczuk/go-chart/util" ) // 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) } // GetValues gets a value at a given index. func (ts TimeSeries) GetValues(index int) (x, y float64) { x = util.Time.ToFloat64(ts.XValues[index]) y = ts.YValues[index] return } // GetLastValues gets the last value. 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 } // 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 }