haopengzhan
5c185da0a9
- Implement dynamic SEO meta tags and sitemap.xml for toolbox.pengzhan.dev - Fix SPA title/meta refresh issue in layout.html - Address golangci-lint findings: - Refactor switch-case for tool path and SVG token parsing - Replace math.Pow with direct multiplication for performance - Fix unhandled error returns and unused imports - Omit redundant type declarations
410 lines
11 KiB
Go
410 lines
11 KiB
Go
package logic
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import (
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"bytes"
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"math"
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"regexp"
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"strconv"
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"github.com/signintech/gopdf"
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"golang.org/x/image/font/sfnt"
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)
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var (
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embeddedFont []byte
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fontMap = make(map[string]string)
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sfntMap = make(map[string]*sfnt.Font)
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)
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func SetFontData(data []byte) { embeddedFont = data }
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func RegisterFontPath(id, path string) { fontMap[id] = path }
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func RegisterFontSFNT(id string, f *sfnt.Font) { sfntMap[id] = f }
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// HasGlyph 检查字体是否包含某个字符
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func HasGlyph(fontId string, char rune) bool {
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f, ok := sfntMap[fontId]
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if !ok {
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return false
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}
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var buffer sfnt.Buffer
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idx, err := f.GlyphIndex(&buffer, char)
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return err == nil && idx != 0
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}
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// GeneratePDFExtended 支持动态字体切换和缺字降级
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func GeneratePDFExtended(chars []HanziData, mode, paperSize, fontId string) ([]byte, error) {
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pdf := &gopdf.GoPdf{}
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rect := gopdf.Rect{W: 595.28, H: 841.89}
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if paperSize == "Letter" {
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rect = gopdf.Rect{W: 612, H: 792}
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}
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pdf.Start(gopdf.Config{PageSize: rect})
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if len(embeddedFont) > 0 {
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_ = pdf.AddTTFFontData("font", embeddedFont)
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}
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// 注册所有可用字体
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for id, path := range fontMap {
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_ = pdf.AddTTFFont(id, path)
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}
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switch mode {
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case "step":
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addStepPages(pdf, chars, true, rect.W, rect.H)
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case "manuscript":
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addManuscriptPages(pdf, chars, rect.W, rect.H, fontId)
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default:
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addTeachingPages(pdf, chars, true, rect.W, rect.H)
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}
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var buf bytes.Buffer
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_, err := pdf.WriteTo(&buf)
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return buf.Bytes(), err
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}
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func addTeachingPages(pdf *gopdf.GoPdf, chars []HanziData, flipY bool, pW, pH float64) {
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cols := 2
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gap, margin := 17.0, 40.0
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size := math.Min((pW-2*margin-gap)/2, (pH-2*margin-2*gap)/3)
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totalW, totalH := 2*size+gap, 3*size+2*gap
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marginX, marginY := (pW-totalW)/2, (pH-totalH)/2
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for i := 0; i < len(chars); i += 6 {
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pdf.AddPage()
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end := i + 6
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if end > len(chars) {
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end = len(chars)
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}
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for idx, data := range chars[i:end] {
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drawCharacter(pdf, data, marginX+float64(idx%cols)*(size+gap), marginY+float64(idx/cols)*(size+gap), size, flipY, len(data.Strokes), true)
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}
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}
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}
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func addStepPages(pdf *gopdf.GoPdf, chars []HanziData, flipY bool, pW, pH float64) {
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cols, margin := 9, 30.0
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size := (pW - 2*margin) / float64(cols)
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pdf.AddPage()
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currY := margin
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for _, data := range chars {
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numS := len(data.Strokes)
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rowsN := 1
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if numS > 8 {
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rowsN = 1 + (numS-8+7)/8
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}
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if currY+float64(rowsN)*size > pH-margin {
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pdf.AddPage()
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currY = margin
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}
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totalG := rowsN * cols
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strokeC := 0
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for gIdx := 0; gIdx < totalG; gIdx++ {
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r, c := gIdx/cols, gIdx%cols
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x, y := margin+float64(c)*size, currY+float64(r)*size
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if r == 0 && c == 0 {
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drawCharacter(pdf, data, x, y, size, flipY, len(data.Strokes), false)
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strokeC = 1
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} else if r > 0 && c == 0 {
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drawMiZiGe(pdf, x, y, size)
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} else if strokeC <= numS {
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drawStepBox(pdf, data, x, y, size, flipY, strokeC)
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strokeC++
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} else {
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drawMiZiGe(pdf, x, y, size)
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}
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}
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currY += float64(rowsN) * size
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}
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}
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func addManuscriptPages(pdf *gopdf.GoPdf, chars []HanziData, pW, pH float64, targetFont string) {
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margin := 40.0
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cols, rows := 10, 15
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colW, rowH := (pW-2*margin)/float64(cols), (pH-2*margin)/float64(rows)
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fontSize := colW * 0.75
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pdf.AddPage()
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drawManuscriptGrid(pdf, pW, pH, margin, cols, colW)
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cIdx, rIdx := 0, 0
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for _, data := range chars {
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if data.Character == "\n" {
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cIdx++
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rIdx = 0
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if cIdx >= cols {
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pdf.AddPage()
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cIdx = 0
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drawManuscriptGrid(pdf, pW, pH, margin, cols, colW)
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}
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continue
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}
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if rIdx >= rows {
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cIdx++
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rIdx = 0
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if cIdx >= cols {
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pdf.AddPage()
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cIdx = 0
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drawManuscriptGrid(pdf, pW, pH, margin, cols, colW)
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}
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}
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x, y := pW-margin-float64(cIdx+1)*colW, margin+float64(rIdx)*rowH
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charRune := []rune(data.Character)[0]
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// 智能字体选择
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renderFont := targetFont
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isFallback := false
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if !HasGlyph(targetFont, charRune) {
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// 尝试降级到字库最全的宋体或楷体
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if HasGlyph("songti", charRune) {
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renderFont = "songti"
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isFallback = true
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} else if HasGlyph("kaiti", charRune) {
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renderFont = "kaiti"
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isFallback = true
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} else {
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// 全部缺失，保留空白
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rIdx++
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continue
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}
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}
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pdf.SetFillColor(200, 200, 200)
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if isFallback {
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// 降级显示：小字 (1/2 大小)，右上角对齐
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smallSize := fontSize * 0.5
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_ = pdf.SetFont(renderFont, "", smallSize)
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// 计算右上角位置：X靠右，Y靠上
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pdf.SetXY(x+colW-smallSize-2, y+2)
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_ = pdf.Cell(nil, data.Character)
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} else {
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// 正常显示
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_ = pdf.SetFont(renderFont, "", fontSize)
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pdf.SetXY(x+(colW-fontSize*0.9)/2, y+(rowH-fontSize)/2)
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_ = pdf.Cell(nil, data.Character)
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}
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rIdx++
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}
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}
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func drawManuscriptGrid(pdf *gopdf.GoPdf, pW, pH, margin float64, cols int, colW float64) {
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pdf.SetStrokeColor(200, 0, 0)
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pdf.SetLineWidth(0.6)
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for c := 0; c <= cols; c++ {
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x := pW - margin - float64(c)*colW
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pdf.Line(x, margin, x, pH-margin)
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}
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pdf.Line(margin, margin, pW-margin, margin)
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pdf.Line(margin, pH-margin, pW-margin, pH-margin)
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}
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func drawCharacter(pdf *gopdf.GoPdf, data HanziData, x, y, size float64, flipY bool, strokeLimit int, showAnnotations bool) {
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if showAnnotations {
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drawGrid(pdf, x, y, size)
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} else {
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drawMiZiGe(pdf, x, y, size)
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}
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p, drawS := size*0.12, size-(size*0.12*2)
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scale := drawS / 1024.0
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if strokeLimit == len(data.Strokes) {
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if showAnnotations {
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pdf.SetFillColor(240, 240, 240)
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} else {
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pdf.SetFillColor(0, 0, 0)
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}
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} else {
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pdf.SetFillColor(180, 180, 180)
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}
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for sIdx := 0; sIdx < len(data.Strokes); sIdx++ {
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if sIdx >= strokeLimit && strokeLimit != len(data.Strokes) {
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break
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}
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pts := parseSVGPath(data.Strokes[sIdx], scale, x+p, y+p, flipY)
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if len(pts) > 2 {
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pdf.Polygon(pts, "F")
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}
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}
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if showAnnotations && strokeLimit == len(data.Strokes) {
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fS := size * 0.035
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_ = pdf.SetFont("font", "", fS)
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for idx, median := range data.Medians {
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mP := transformPoints(median, scale, x+p, y+p, flipY)
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if len(mP) < 2 {
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continue
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}
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pdf.SetStrokeColor(255, 0, 0)
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pdf.SetLineWidth(0.6)
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for j := 0; j < len(mP)-1; j++ {
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pdf.Line(mP[j].X, mP[j].Y, mP[j+1].X, mP[j+1].Y)
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}
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pdf.SetFillColor(255, 0, 0)
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drawArrow(pdf, mP[len(mP)-1], mP[len(mP)-2], size*0.035)
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r := size * 0.025
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dx, dy := mP[1].X-mP[0].X, mP[1].Y-mP[0].Y
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dist := math.Sqrt(dx*dx + dy*dy)
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ux, uy := -1.0, -1.0
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if dist > 0.001 {
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ux, uy = dx/dist, dy/dist
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}
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cX, cY := mP[0].X-ux*r, mP[0].Y-uy*r
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pdf.SetStrokeColor(255, 0, 0)
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pdf.SetLineWidth(0.5)
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pdf.Oval(cX-r, cY-r, cX+r, cY+r)
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numS := strconv.Itoa(idx + 1)
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tw := fS * 0.6 * float64(len(numS)) / 2
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if len(numS) > 1 {
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tw = fS * 0.5
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}
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pdf.SetFillColor(255, 0, 0)
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pdf.SetXY(cX-tw/2, cY-fS/2)
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_ = pdf.Cell(nil, numS)
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}
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}
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}
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func drawStepBox(pdf *gopdf.GoPdf, data HanziData, x, y, size float64, flipY bool, limit int) {
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drawMiZiGe(pdf, x, y, size)
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p, scale := size*0.12, (size-(size*0.12*2))/1024.0
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pdf.SetFillColor(180, 180, 180)
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for i := 0; i < limit; i++ {
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pts := parseSVGPath(data.Strokes[i], scale, x+p, y+p, flipY)
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if len(pts) > 2 {
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pdf.Polygon(pts, "F")
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}
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}
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}
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func drawGrid(pdf *gopdf.GoPdf, x, y, size float64) {
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pdf.SetStrokeColor(220, 220, 220)
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pdf.SetLineWidth(0.4)
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pdf.RectFromUpperLeft(x, y, size, size)
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mid := size / 2
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drawDashedLine(pdf, x, y+mid, x+size, y+mid)
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drawDashedLine(pdf, x+mid, y, x+mid, y+size)
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}
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func drawMiZiGe(pdf *gopdf.GoPdf, x, y, size float64) {
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pdf.SetStrokeColor(220, 220, 220)
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pdf.SetLineWidth(0.4)
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pdf.RectFromUpperLeft(x, y, size, size)
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mid := size / 2
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drawDashedLine(pdf, x, y+mid, x+size, y+mid)
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drawDashedLine(pdf, x+mid, y, x+mid, y+size)
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drawDashedLine(pdf, x, y, x+size, y+size)
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drawDashedLine(pdf, x, y+size, x+size, y)
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}
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func drawDashedLine(pdf *gopdf.GoPdf, x1, y1, x2, y2 float64) {
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dash := 2.0
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dx, dy := x2-x1, y2-y1
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dist := math.Sqrt(dx*dx + dy*dy)
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if dist < 0.001 {
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return
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}
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ux, uy := dx/dist, dy/dist
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for i := 0.0; i < dist; i += dash * 2 {
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end := i + dash
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if end > dist {
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end = dist
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}
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pdf.Line(x1+ux*i, y1+uy*i, x1+ux*end, y1+uy*end)
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}
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}
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func drawArrow(pdf *gopdf.GoPdf, target, prev gopdf.Point, length float64) {
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angle := math.Atan2(target.Y-prev.Y, target.X-prev.X)
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arrowA := math.Pi / 6
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p1X := target.X + length*math.Cos(angle+math.Pi+arrowA)
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p1Y := target.Y + length*math.Sin(angle+math.Pi+arrowA)
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p2X := target.X + length*math.Cos(angle+math.Pi-arrowA)
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p2Y := target.Y + length*math.Sin(angle+math.Pi-arrowA)
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pdf.Polygon([]gopdf.Point{target, {X: p1X, Y: p1Y}, {X: p2X, Y: p2Y}}, "F")
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}
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func transformPoints(pts []Point, scale, ox, oy float64, flipY bool) []gopdf.Point {
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res := make([]gopdf.Point, len(pts))
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for i, p := range pts {
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y := p[1]
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if flipY {
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y = 1024 - y
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}
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res[i] = gopdf.Point{X: ox + p[0]*scale, Y: oy + y*scale}
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}
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return res
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}
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var reSVG = regexp.MustCompile(`([MLQCZ])|(-?\d+\.?\d*)`)
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func parseSVGPath(path string, scale, ox, oy float64, flipY bool) []gopdf.Point {
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var pts []gopdf.Point
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matches := reSVG.FindAllStringSubmatch(path, -1)
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var lastX, lastY float64
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for idx := 0; idx < len(matches); {
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item := matches[idx][0]
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switch item {
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case "M", "L":
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if idx+2 < len(matches) {
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x, _ := strconv.ParseFloat(matches[idx+1][0], 64)
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y, _ := strconv.ParseFloat(matches[idx+2][0], 64)
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lastX, lastY = x, y
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if flipY {
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y = 1024 - y
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}
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pts = append(pts, gopdf.Point{X: ox + x*scale, Y: oy + y*scale})
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idx += 3
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} else {
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idx++
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}
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case "C":
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if idx+6 < len(matches) {
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x1, _ := strconv.ParseFloat(matches[idx+1][0], 64)
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y1, _ := strconv.ParseFloat(matches[idx+2][0], 64)
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x2, _ := strconv.ParseFloat(matches[idx+3][0], 64)
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y2, _ := strconv.ParseFloat(matches[idx+4][0], 64)
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x, _ := strconv.ParseFloat(matches[idx+5][0], 64)
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y, _ := strconv.ParseFloat(matches[idx+6][0], 64)
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for t := 0.2; t <= 1.0; t += 0.2 {
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invT := 1 - t
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tx := invT*invT*invT*lastX + 3*invT*invT*t*x1 + 3*invT*t*t*x2 + t*t*t*x
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ty := invT*invT*invT*lastY + 3*invT*invT*t*y1 + 3*invT*t*t*y2 + t*t*t*y
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ty_f := ty
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if flipY {
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ty_f = 1024 - ty
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}
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pts = append(pts, gopdf.Point{X: ox + tx*scale, Y: oy + ty_f*scale})
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}
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lastX, lastY = x, y
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idx += 7
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} else {
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idx++
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}
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case "Q":
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if idx+4 < len(matches) {
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x1, _ := strconv.ParseFloat(matches[idx+1][0], 64)
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y1, _ := strconv.ParseFloat(matches[idx+2][0], 64)
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x, _ := strconv.ParseFloat(matches[idx+3][0], 64)
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y, _ := strconv.ParseFloat(matches[idx+4][0], 64)
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for t := 0.2; t <= 1.0; t += 0.2 {
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invT := 1 - t
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tx := invT*invT*lastX + 2*invT*t*x1 + t*t*x
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ty := invT*invT*lastY + 2*invT*t*y1 + t*t*y
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ty_f := ty
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if flipY {
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ty_f = 1024 - ty
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}
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pts = append(pts, gopdf.Point{X: ox + tx*scale, Y: oy + ty_f*scale})
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}
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lastX, lastY = x, y
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idx += 5
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} else {
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idx++
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}
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default:
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idx++
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}
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}
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return pts
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}
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