go-chart/annotation_series.go
2016-07-12 20:34:59 -07:00

83 lines
2.2 KiB
Go

package chart
import "math"
// Annotation is a label on the chart.
type Annotation struct {
X, Y float64
Label string
}
// AnnotationSeries is a series of labels on the chart.
type AnnotationSeries struct {
Name string
Style Style
YAxis YAxisType
Annotations []Annotation
}
// 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
}
// 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.Show {
style := as.Style.WithDefaultsFrom(Style{
Font: defaults.Font,
FillColor: DefaultAnnotationFillColor,
FontSize: DefaultAnnotationFontSize,
StrokeColor: defaults.StrokeColor,
StrokeWidth: defaults.StrokeWidth,
Padding: DefaultAnnotationPadding,
})
for _, a := range as.Annotations {
lx := canvasBox.Left + xrange.Translate(a.X)
ly := canvasBox.Bottom - yrange.Translate(a.Y)
ab := MeasureAnnotation(r, canvasBox, style, lx, ly, a.Label)
box.Top = MinInt(box.Top, ab.Top)
box.Left = MinInt(box.Left, ab.Left)
box.Right = MaxInt(box.Right, ab.Right)
box.Bottom = 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.Show {
style := as.Style.WithDefaultsFrom(Style{
Font: defaults.Font,
FontColor: DefaultTextColor,
FillColor: DefaultAnnotationFillColor,
FontSize: DefaultAnnotationFontSize,
StrokeColor: defaults.StrokeColor,
StrokeWidth: defaults.StrokeWidth,
Padding: DefaultAnnotationPadding,
})
for _, a := range as.Annotations {
lx := canvasBox.Left + xrange.Translate(a.X)
ly := canvasBox.Bottom - yrange.Translate(a.Y)
DrawAnnotation(r, canvasBox, style, lx, ly, a.Label)
}
}
}