package chart import ( "fmt" "math" util "git.gutmet.org/go-chart.git/util" ) // Interface Assertions. var ( _ Series = (*AnnotationSeries)(nil) ) // AnnotationSeries is a series of labels on the chart. type AnnotationSeries struct { Name string Style Style YAxis YAxisType Annotations []Value2 } // GetName returns the name of the time series. func (as AnnotationSeries) GetName() string { return as.Name } // GetStyle returns the line style. func (as AnnotationSeries) GetStyle() Style { return as.Style } // GetYAxis returns which YAxis the series draws on. func (as AnnotationSeries) GetYAxis() YAxisType { return as.YAxis } func (as AnnotationSeries) annotationStyleDefaults(defaults Style) Style { return Style{ FontColor: DefaultTextColor, Font: defaults.Font, FillColor: DefaultAnnotationFillColor, FontSize: DefaultAnnotationFontSize, StrokeColor: defaults.StrokeColor, StrokeWidth: defaults.StrokeWidth, Padding: DefaultAnnotationPadding, } } // Measure returns a bounds box of the series. func (as AnnotationSeries) Measure(r Renderer, canvasBox Box, xrange, yrange Range, defaults Style) Box { box := Box{ Top: math.MaxInt32, Left: math.MaxInt32, Right: 0, Bottom: 0, } if as.Style.IsZero() || as.Style.Show { seriesStyle := as.Style.InheritFrom(as.annotationStyleDefaults(defaults)) for _, a := range as.Annotations { style := a.Style.InheritFrom(seriesStyle) lx := canvasBox.Left + xrange.Translate(a.XValue) ly := canvasBox.Bottom - yrange.Translate(a.YValue) ab := Draw.MeasureAnnotation(r, canvasBox, style, lx, ly, a.Label) box.Top = util.Math.MinInt(box.Top, ab.Top) box.Left = util.Math.MinInt(box.Left, ab.Left) box.Right = util.Math.MaxInt(box.Right, ab.Right) box.Bottom = util.Math.MaxInt(box.Bottom, ab.Bottom) } } return box } // Render draws the series. func (as AnnotationSeries) Render(r Renderer, canvasBox Box, xrange, yrange Range, defaults Style) { if as.Style.IsZero() || as.Style.Show { seriesStyle := as.Style.InheritFrom(as.annotationStyleDefaults(defaults)) for _, a := range as.Annotations { style := a.Style.InheritFrom(seriesStyle) lx := canvasBox.Left + xrange.Translate(a.XValue) ly := canvasBox.Bottom - yrange.Translate(a.YValue) Draw.Annotation(r, canvasBox, style, lx, ly, a.Label) } } } // Validate validates the series. func (as AnnotationSeries) Validate() error { if len(as.Annotations) == 0 { return fmt.Errorf("annotation series requires annotations to be set and not empty") } return nil }