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mark_line.go
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mark_line.go
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package charts
import (
"github.com/golang/freetype/truetype"
)
// NewMarkLine returns a series mark line
func NewMarkLine(markLineTypes ...string) SeriesMarkLine {
data := make([]SeriesMarkData, len(markLineTypes))
for index, t := range markLineTypes {
data[index] = SeriesMarkData{
Type: t,
}
}
return SeriesMarkLine{
Data: data,
}
}
type markLinePainter struct {
p *Painter
options []markLineRenderOption
}
func (m *markLinePainter) Add(opt markLineRenderOption) {
m.options = append(m.options, opt)
}
// NewMarkLinePainter returns a mark line renderer
func NewMarkLinePainter(p *Painter) *markLinePainter {
return &markLinePainter{
p: p,
options: make([]markLineRenderOption, 0),
}
}
type markLineRenderOption struct {
FillColor Color
FontColor Color
StrokeColor Color
Font *truetype.Font
Series Series
Range axisRange
}
func (m *markLinePainter) Render() (Box, error) {
painter := m.p
for _, opt := range m.options {
s := opt.Series
if len(s.MarkLine.Data) == 0 {
continue
}
font := opt.Font
if font == nil {
font = GetDefaultFont()
}
summary := s.Summary()
for _, markLine := range s.MarkLine.Data {
// since the mark line will modify the style, it must be reset every time
painter.OverrideDrawingStyle(Style{
FillColor: opt.FillColor,
StrokeColor: opt.StrokeColor,
StrokeWidth: 1,
StrokeDashArray: []float64{
4,
2,
},
}).OverrideTextStyle(Style{
Font: font,
FontColor: opt.FontColor,
FontSize: labelFontSize,
})
value := float64(0)
switch markLine.Type {
case SeriesMarkDataTypeMax:
value = summary.MaxValue
case SeriesMarkDataTypeMin:
value = summary.MinValue
default:
value = summary.AverageValue
}
y := opt.Range.getRestHeight(value)
width := painter.Width()
text := commafWithDigits(value)
textBox := painter.MeasureText(text)
painter.MarkLine(0, y, width-2)
painter.Text(text, width, y+textBox.Height()>>1-2)
}
}
return BoxZero, nil
}