feat: support line chart draw function

bar.go

@@ -0,0 +1,57 @@
+// 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/wcharczuk/go-chart/v2"
+	"github.com/wcharczuk/go-chart/v2/drawing"
+)
+
+type BarStyle struct {
+	ClassName       string
+	StrokeDashArray []float64
+	FillColor       drawing.Color
+}
+
+func (bs *BarStyle) Style() chart.Style {
+	return chart.Style{
+		ClassName:       bs.ClassName,
+		StrokeDashArray: bs.StrokeDashArray,
+		StrokeColor:     bs.FillColor,
+		StrokeWidth:     1,
+		FillColor:       bs.FillColor,
+	}
+}
+
+func (d *Draw) Bar(b chart.Box, style BarStyle) {
+	s := style.Style()
+
+	r := d.Render
+	s.GetFillAndStrokeOptions().WriteToRenderer(r)
+	d.moveTo(b.Left, b.Top)
+	d.lineTo(b.Right, b.Top)
+	d.lineTo(b.Right, b.Bottom)
+	d.lineTo(b.Left, b.Bottom)
+	d.lineTo(b.Left, b.Top)
+	d.Render.FillStroke()
+}