87 lines
2.3 KiB
Go
87 lines
2.3 KiB
Go
package chart
|
|
|
|
// 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: canvasBox.Bottom,
|
|
Left: canvasBox.Right,
|
|
Right: canvasBox.Left,
|
|
Bottom: canvasBox.Top,
|
|
}
|
|
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.Right - xrange.Translate(a.X)
|
|
ly := yrange.Translate(a.Y) + canvasBox.Top
|
|
aBox := MeasureAnnotation(r, canvasBox, xrange, yrange, style, lx, ly, a.Label)
|
|
if aBox.Top < box.Top {
|
|
box.Top = aBox.Top
|
|
}
|
|
if aBox.Left < box.Left {
|
|
box.Left = aBox.Left
|
|
}
|
|
if aBox.Right > box.Right {
|
|
box.Right = aBox.Right
|
|
}
|
|
if aBox.Bottom > box.Bottom {
|
|
box.Bottom = aBox.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,
|
|
FillColor: DefaultAnnotationFillColor,
|
|
FontSize: DefaultAnnotationFontSize,
|
|
StrokeColor: defaults.StrokeColor,
|
|
StrokeWidth: defaults.StrokeWidth,
|
|
Padding: DefaultAnnotationPadding,
|
|
})
|
|
for _, a := range as.Annotations {
|
|
lx := canvasBox.Right - xrange.Translate(a.X)
|
|
ly := yrange.Translate(a.Y) + canvasBox.Top
|
|
DrawAnnotation(r, canvasBox, xrange, yrange, style, lx, ly, a.Label)
|
|
}
|
|
}
|
|
}
|