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