chore: supper grid renderer

alias.go

@@ -28,7 +28,6 @@ import (
 )
 
 type Box = chart.Box
-type Renderer = chart.Renderer
 type Style = chart.Style
 type Color = drawing.Color
 

charts.go

@@ -0,0 +1,27 @@
+// 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
+
+type Renderer interface {
+	Render() (Box, error)
+}

examples/painter/main.go

@@ -409,6 +409,19 @@ func main() {
 		Bottom: 20,
 	})
 
+	top += 50
+	charts.NewGridPainter(p.Child(charts.PainterBoxOption(charts.Box{
+		Top:    top,
+		Left:   1,
+		Right:  p.Width() - 1,
+		Bottom: top + 100,
+	})), charts.GridPainterOption{
+		Row:            5,
+		IgnoreFirstRow: true,
+		IgnoreLastRow:  true,
+		StrokeColor:    drawing.ColorBlue,
+	}).Render()
+
 	buf, err := p.Bytes()
 	if err != nil {
 		panic(err)

grid.go

@@ -0,0 +1,80 @@
+// 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
+
+type GridPainter struct {
+	p   *Painter
+	opt *GridPainterOption
+}
+
+type GridPainterOption struct {
+	StrokeWidth       float64
+	StrokeColor       Color
+	Column            int
+	Row               int
+	IgnoreFirstRow    bool
+	IgnoreLastRow     bool
+	IgnoreFirstColumn bool
+	IgnoreLastColumn  bool
+}
+
+func NewGridPainter(p *Painter, opt GridPainterOption) *GridPainter {
+	return &GridPainter{
+		p:   p,
+		opt: &opt,
+	}
+}
+
+func (g *GridPainter) Render() (Box, error) {
+	opt := g.opt
+	ignoreColumnLines := make([]int, 0)
+	if opt.IgnoreFirstColumn {
+		ignoreColumnLines = append(ignoreColumnLines, 0)
+	}
+	if opt.IgnoreLastColumn {
+		ignoreColumnLines = append(ignoreColumnLines, opt.Column)
+	}
+	ignoreRowLines := make([]int, 0)
+	if opt.IgnoreFirstRow {
+		ignoreRowLines = append(ignoreRowLines, 0)
+	}
+	if opt.IgnoreLastRow {
+		ignoreRowLines = append(ignoreRowLines, opt.Row)
+	}
+	strokeWidth := opt.StrokeWidth
+	if strokeWidth <= 0 {
+		strokeWidth = 1
+	}
+
+	g.p.SetDrawingStyle(Style{
+		StrokeWidth: strokeWidth,
+		StrokeColor: opt.StrokeColor,
+	})
+	g.p.Grid(GridOption{
+		Column:            opt.Column,
+		Row:               opt.Row,
+		IgnoreColumnLines: ignoreColumnLines,
+		IgnoreRowLines:    ignoreRowLines,
+	})
+	return g.p.box, nil
+}

painter.go

@@ -32,7 +32,7 @@ import (
 )
 
 type Painter struct {
-	render Renderer
+	render chart.Renderer
 	box    Box
 	font   *truetype.Font
 	parent *Painter