feat: support make point and make line

mark_line.go

@@ -0,0 +1,92 @@
+// MIT License
+
+// Copyright (c) 2022 Tree Xie
+
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+package charts
+
+import (
+	"github.com/golang/freetype/truetype"
+	"github.com/wcharczuk/go-chart/v2"
+	"github.com/wcharczuk/go-chart/v2/drawing"
+)
+
+func NewMarkLine(markLineTypes ...string) SeriesMarkLine {
+	data := make([]SeriesMarkLineData, len(markLineTypes))
+	for index, t := range markLineTypes {
+		data[index] = SeriesMarkLineData{
+			Type: t,
+		}
+	}
+	return SeriesMarkLine{
+		Data: data,
+	}
+}
+
+type markLineRenderOption struct {
+	Draw        *Draw
+	FillColor   drawing.Color
+	FontColor   drawing.Color
+	StrokeColor drawing.Color
+	Font        *truetype.Font
+	Series      *Series
+	Range       *Range
+}
+
+func markLineRender(opt *markLineRenderOption) {
+	d := opt.Draw
+	s := opt.Series
+	if len(s.MarkLine.Data) == 0 {
+		return
+	}
+	r := d.Render
+	summary := s.Summary()
+	for _, markLine := range s.MarkLine.Data {
+		// 由于mark line会修改style，因此每次重新设置
+		chart.Style{
+			FillColor:   opt.FillColor,
+			FontColor:   opt.FontColor,
+			FontSize:    labelFontSize,
+			StrokeColor: opt.StrokeColor,
+			StrokeWidth: 1,
+			Font:        opt.Font,
+			StrokeDashArray: []float64{
+				4,
+				2,
+			},
+		}.WriteToRenderer(r)
+		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 := d.Box.Width()
+		text := commafWithDigits(value)
+		textBox := r.MeasureText(text)
+		d.makeLine(0, y, width)
+		d.text(text, width, y+textBox.Height()>>1-2)
+	}
+
+}