feat: add multi line text draw

draw.go

@@ -277,6 +277,35 @@ func (d *Draw) text(body string, x, y int) {
 	d.Render.Text(body, x+d.Box.Left, y+d.Box.Top)
 }
 
+func (d *Draw) textFit(body string, x, y, width int, style chart.Style) chart.Box {
+	style.TextWrap = chart.TextWrapWord
+	r := d.Render
+	lines := chart.Text.WrapFit(r, body, width, style)
+	style.WriteTextOptionsToRenderer(r)
+	var output chart.Box
+
+	for index, line := range lines {
+		x0 := x
+		y0 := y + output.Height()
+		d.text(line, x0, y0)
+		lineBox := r.MeasureText(line)
+		output.Right = chart.MaxInt(lineBox.Right, output.Right)
+		output.Bottom += lineBox.Height()
+		if index < len(lines)-1 {
+			output.Bottom += +style.GetTextLineSpacing()
+		}
+	}
+	return output
+}
+
+func (d *Draw) measureTextFit(body string, x, y, width int, style chart.Style) chart.Box {
+	style.TextWrap = chart.TextWrapWord
+	r := d.Render
+	lines := chart.Text.WrapFit(r, body, width, style)
+	style.WriteTextOptionsToRenderer(r)
+	return chart.Text.MeasureLines(r, lines, style)
+}
+
 func (d *Draw) lineStroke(points []Point, style LineStyle) {
 	s := style.Style()
 	if !s.ShouldDrawStroke() {

draw_test.go

@@ -475,3 +475,33 @@ func TestDraw(t *testing.T) {
 		assert.Equal(tt.result, string(data))
 	}
 }
+
+func TestDrawTextFit(t *testing.T) {
+	assert := assert.New(t)
+	d, err := NewDraw(DrawOption{
+		Width:  400,
+		Height: 300,
+	})
+	assert.Nil(err)
+	f, _ := chart.GetDefaultFont()
+	style := chart.Style{
+		FontSize:  12,
+		FontColor: chart.ColorBlack,
+		Font:      f,
+	}
+	box := d.textFit("Hello World!", 0, 20, 80, style)
+	assert.Equal(chart.Box{
+		Right:  45,
+		Bottom: 35,
+	}, box)
+
+	box = d.textFit("Hello World!", 0, 100, 200, style)
+	assert.Equal(chart.Box{
+		Right:  84,
+		Bottom: 15,
+	}, box)
+
+	buf, err := d.Bytes()
+	assert.Nil(err)
+	assert.Equal(`<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="400" height="300">\n<text x="0" y="20" style="stroke-width:0;stroke:none;fill:rgba(51,51,51,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif">Hello</text><text x="0" y="40" style="stroke-width:0;stroke:none;fill:rgba(51,51,51,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif">World!</text><text x="0" y="100" style="stroke-width:0;stroke:none;fill:rgba(51,51,51,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif">Hello World!</text></svg>`, string(buf))
+}

table.go

@@ -0,0 +1,145 @@
+// 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 (
+	"errors"
+
+	"github.com/wcharczuk/go-chart/v2"
+)
+
+type TableOption struct {
+	// draw
+	Draw *Draw
+	// The width of table
+	Width int
+	// The header of table
+	Header []string
+	// The style of table
+	Style        chart.Style
+	ColumnWidths []float64
+	// 是否仅测量高度
+	measurement bool
+}
+
+var ErrTableColumnWidthInvalid = errors.New("table column width is invalid")
+
+func tableDivideWidth(width, size int, columnWidths []float64) ([]int, error) {
+	widths := make([]int, size)
+
+	autoFillCount := size
+	restWidth := width
+	if len(columnWidths) != 0 {
+		for index, v := range columnWidths {
+			if v <= 0 {
+				continue
+			}
+			autoFillCount--
+			// 小于1的表示占比
+			if v < 1 {
+				widths[index] = int(v * float64(width))
+			} else {
+				widths[index] = int(v)
+			}
+			restWidth -= widths[index]
+		}
+	}
+	if restWidth < 0 {
+		return nil, ErrTableColumnWidthInvalid
+	}
+	// 填充其它未指定的宽度
+	if autoFillCount > 0 {
+		autoWidth := restWidth / autoFillCount
+		for index, v := range widths {
+			if v == 0 {
+				widths[index] = autoWidth
+			}
+		}
+	}
+	widthSum := 0
+	for _, v := range widths {
+		widthSum += v
+	}
+	if widthSum > width {
+		return nil, ErrTableColumnWidthInvalid
+	}
+	return widths, nil
+}
+
+func TableMeasure(opt TableOption) (chart.Box, error) {
+	d, err := NewDraw(DrawOption{
+		Width:  opt.Width,
+		Height: 600,
+	})
+	if err != nil {
+		return chart.BoxZero, err
+	}
+	opt.Draw = d
+	opt.measurement = true
+	return tableRender(opt)
+}
+
+func tableRender(opt TableOption) (chart.Box, error) {
+	if opt.Draw == nil {
+		return chart.BoxZero, errors.New("draw can not be nil")
+	}
+	if len(opt.Header) == 0 {
+		return chart.BoxZero, errors.New("header can not be nil")
+	}
+	width := opt.Width
+	if width == 0 {
+		width = opt.Draw.Box.Width()
+	}
+
+	columnWidths, err := tableDivideWidth(width, len(opt.Header), opt.ColumnWidths)
+	if err != nil {
+		return chart.BoxZero, err
+	}
+
+	d := opt.Draw
+	style := opt.Style
+	y := 0
+	x := 0
+
+	headerMaxHeight := 0
+	for index, text := range opt.Header {
+		var box chart.Box
+		w := columnWidths[index]
+		y0 := y + int(opt.Style.FontSize)
+		if opt.measurement {
+			box = d.measureTextFit(text, x, y0, w, style)
+		} else {
+			box = d.textFit(text, x, y0, w, style)
+		}
+		if box.Height() > headerMaxHeight {
+			headerMaxHeight = box.Height()
+		}
+		x += w
+	}
+	y += headerMaxHeight
+
+	return chart.Box{
+		Right:  width,
+		Bottom: y,
+	}, nil
+}