71 lines
1.6 KiB
Go
71 lines
1.6 KiB
Go
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package chart
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import (
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"fmt"
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"github.com/blendlabs/go-util"
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)
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// ContinuousSeries represents a line on a chart.
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type ContinuousSeries struct {
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Name string
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Style Style
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FinalValueLabel Style
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XValues []float64
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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 (cs ContinuousSeries) GetName() string {
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return cs.Name
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}
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// GetStyle returns the line style.
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func (cs ContinuousSeries) GetStyle() Style {
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return cs.Style
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}
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// Len returns the number of elements in the series.
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func (cs ContinuousSeries) Len() int {
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return len(cs.XValues)
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}
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// GetValue gets a value at a given index.
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func (cs ContinuousSeries) GetValue(index int) (float64, float64) {
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return cs.XValues[index], cs.YValues[index]
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}
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// GetXFormatter returns the xs value formatter.
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func (cs ContinuousSeries) GetXFormatter() Formatter {
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return func(v interface{}) string {
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if typed, isTyped := v.(float64); isTyped {
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return fmt.Sprintf("%0.2f", typed)
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}
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return util.StringEmpty
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}
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}
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// GetYFormatter returns the y value formatter.
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func (cs ContinuousSeries) GetYFormatter() Formatter {
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return cs.GetXFormatter()
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}
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// Render renders the series.
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func (cs ContinuousSeries) Render(c *Chart, r Renderer, canvasBox Box, xrange, yrange Range) error {
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DrawLineSeries(c, r, canvasBox, xrange, yrange, cs)
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if cs.FinalValueLabel.Show {
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asw := 0
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if c.Axes.Show {
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asw = int(c.Axes.GetStrokeWidth(DefaultAxisLineWidth))
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}
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_, lv := cs.GetValue(cs.Len() - 1)
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ll := yrange.Format(lv)
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lx := canvasBox.Right + asw
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ly := yrange.Translate(lv) + canvasBox.Top
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DrawAnnotation(c, r, canvasBox, xrange, yrange, cs.FinalValueLabel, lx, ly, ll)
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}
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}
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