129 lines
3.3 KiB
Go
129 lines
3.3 KiB
Go
package chart
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import (
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"math"
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"time"
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)
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// CreateContinuousSeriesLastValueLabel returns a (1) value annotation series.
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func CreateContinuousSeriesLastValueLabel(name string, xvalues, yvalues []float64, valueFormatter ValueFormatter) AnnotationSeries {
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return AnnotationSeries{
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Name: name,
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Style: Style{
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Show: true,
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StrokeColor: GetDefaultSeriesStrokeColor(0),
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},
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Annotations: []Annotation{
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Annotation{
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X: xvalues[len(xvalues)-1],
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Y: yvalues[len(yvalues)-1],
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Label: valueFormatter(yvalues[len(yvalues)-1]),
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},
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},
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}
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}
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// CreateTimeSeriesLastValueLabel returns a (1) value annotation series.
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func CreateTimeSeriesLastValueLabel(name string, xvalues []time.Time, yvalues []float64, valueFormatter ValueFormatter) AnnotationSeries {
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return AnnotationSeries{
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Name: name,
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Style: Style{
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Show: true,
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StrokeColor: GetDefaultSeriesStrokeColor(0),
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},
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Annotations: []Annotation{
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Annotation{
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X: float64(xvalues[len(xvalues)-1].Unix()),
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Y: yvalues[len(yvalues)-1],
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Label: valueFormatter(yvalues[len(yvalues)-1]),
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},
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},
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}
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}
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// Annotation is a label on the chart.
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type Annotation struct {
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X, Y float64
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Label string
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}
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// AnnotationSeries is a series of labels on the chart.
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type AnnotationSeries struct {
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Name string
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Style Style
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YAxis YAxisType
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Annotations []Annotation
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}
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// GetName returns the name of the time series.
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func (as AnnotationSeries) GetName() string {
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return as.Name
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}
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// GetStyle returns the line style.
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func (as AnnotationSeries) GetStyle() Style {
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return as.Style
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}
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// GetYAxis returns which YAxis the series draws on.
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func (as AnnotationSeries) GetYAxis() YAxisType {
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return as.YAxis
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}
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// Measure returns a bounds box of the series.
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func (as AnnotationSeries) Measure(r Renderer, canvasBox Box, xrange, yrange Range, defaults Style) Box {
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box := Box{
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Top: math.MaxInt32,
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Left: math.MaxInt32,
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Right: 0,
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Bottom: 0,
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}
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if as.Style.Show {
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style := as.Style.WithDefaultsFrom(Style{
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Font: defaults.Font,
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FillColor: DefaultAnnotationFillColor,
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FontSize: DefaultAnnotationFontSize,
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StrokeColor: defaults.StrokeColor,
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StrokeWidth: defaults.StrokeWidth,
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Padding: DefaultAnnotationPadding,
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})
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for _, a := range as.Annotations {
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lx := canvasBox.Right - xrange.Translate(a.X)
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ly := yrange.Translate(a.Y) + canvasBox.Top
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ab := MeasureAnnotation(r, canvasBox, xrange, yrange, style, lx, ly, a.Label)
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if ab.Top < box.Top {
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box.Top = ab.Top
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}
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if ab.Left < box.Left {
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box.Left = ab.Left
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}
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if ab.Right > box.Right {
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box.Right = ab.Right
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}
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if ab.Bottom > box.Bottom {
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box.Bottom = ab.Bottom
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}
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}
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}
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return box
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}
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// Render draws the series.
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func (as AnnotationSeries) Render(r Renderer, canvasBox Box, xrange, yrange Range, defaults Style) {
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if as.Style.Show {
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style := as.Style.WithDefaultsFrom(Style{
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Font: defaults.Font,
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FillColor: DefaultAnnotationFillColor,
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FontSize: DefaultAnnotationFontSize,
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StrokeColor: defaults.StrokeColor,
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StrokeWidth: defaults.StrokeWidth,
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Padding: DefaultAnnotationPadding,
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})
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for _, a := range as.Annotations {
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lx := canvasBox.Right - xrange.Translate(a.X)
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ly := yrange.Translate(a.Y) + canvasBox.Top
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DrawAnnotation(r, canvasBox, xrange, yrange, style, lx, ly, a.Label)
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}
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}
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}
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