82 lines
2.2 KiB
Go
82 lines
2.2 KiB
Go
package chart
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import "math"
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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.Left + xrange.Translate(a.X)
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ly := canvasBox.Bottom - yrange.Translate(a.Y)
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ab := MeasureAnnotation(r, canvasBox, style, lx, ly, a.Label)
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box.Top = MinInt(box.Top, ab.Top)
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box.Left = MinInt(box.Left, ab.Left)
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box.Right = MaxInt(box.Right, ab.Right)
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box.Bottom = MaxInt(box.Bottom, ab.Bottom)
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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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FontColor: DefaultTextColor,
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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.Left + xrange.Translate(a.X)
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ly := canvasBox.Bottom - yrange.Translate(a.Y)
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DrawAnnotation(r, canvasBox, style, lx, ly, a.Label)
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}
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}
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}
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