254 lines
10 KiB
Go
254 lines
10 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 { return false }
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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" { rect = gopdf.Rect{W: 612, H: 792} }
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pdf.Start(gopdf.Config{PageSize: rect})
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if len(embeddedFont) > 0 { _ = pdf.AddTTFFontData("font", embeddedFont) }
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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; 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; if end > len(chars) { end = len(chars) }
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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; size := (pW - 2*margin) / float64(cols)
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pdf.AddPage(); currY := margin
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for _, data := range chars {
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numS := len(data.Strokes); rowsN := 1; if numS > 8 { rowsN = 1 + (numS - 8 + 7) / 8 }
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if currY + float64(rowsN)*size > pH - margin { pdf.AddPage(); currY = margin }
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totalG := rowsN * cols; strokeC := 0
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for gIdx := 0; gIdx < totalG; gIdx++ {
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r, c := gIdx/cols, gIdx%cols; x, y := margin+float64(c)*size, currY+float64(r)*size
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if r == 0 && c == 0 { drawCharacter(pdf, data, x, y, size, flipY, len(data.Strokes), false); strokeC = 1
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} else if r > 0 && c == 0 { drawMiZiGe(pdf, x, y, size)
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} else if strokeC <= numS { drawStepBox(pdf, data, x, y, size, flipY, strokeC); strokeC++
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} else { drawMiZiGe(pdf, x, y, size) }
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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; 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(); 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++; rIdx = 0
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if cIdx >= cols { pdf.AddPage(); cIdx = 0; drawManuscriptGrid(pdf, pW, pH, margin, cols, colW) }
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continue
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}
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if rIdx >= rows {
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cIdx++; rIdx = 0
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if cIdx >= cols { pdf.AddPage(); cIdx = 0; drawManuscriptGrid(pdf, pW, pH, margin, cols, colW) }
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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"; isFallback = true
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} else if HasGlyph("kaiti", charRune) {
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renderFont = "kaiti"; isFallback = true
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} else {
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// 全部缺失，保留空白
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rIdx++; 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); pdf.SetLineWidth(0.6)
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for c := 0; c <= cols; c++ { x := pW - margin - float64(c)*colW; pdf.Line(x, margin, x, pH-margin) }
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pdf.Line(margin, margin, pW-margin, margin); 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 { drawGrid(pdf, x, y, size) } else { drawMiZiGe(pdf, x, y, size) }
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p, drawS := size*0.12, size-(size*0.12*2); scale := drawS/1024.0
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if strokeLimit == len(data.Strokes) {
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if showAnnotations { pdf.SetFillColor(240, 240, 240) } else { pdf.SetFillColor(0, 0, 0) }
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} else { pdf.SetFillColor(180, 180, 180) }
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for sIdx := 0; sIdx < len(data.Strokes); sIdx++ {
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if sIdx >= strokeLimit && strokeLimit != len(data.Strokes) { break }
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pts := parseSVGPath(data.Strokes[sIdx], scale, x+p, y+p, flipY)
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if len(pts) > 2 { pdf.Polygon(pts, "F") }
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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); if len(mP) < 2 { continue }
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pdf.SetStrokeColor(255, 0, 0); pdf.SetLineWidth(0.6)
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for j := 0; j < len(mP)-1; j++ { pdf.Line(mP[j].X, mP[j].Y, mP[j+1].X, mP[j+1].Y) }
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pdf.SetFillColor(255, 0, 0); drawArrow(pdf, mP[len(mP)-1], mP[len(mP)-2], size*0.035)
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r := size*0.025; dx, dy := mP[1].X-mP[0].X, mP[1].Y-mP[0].Y; dist := math.Sqrt(dx*dx+dy*dy); ux, uy := -1.0, -1.0
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if dist > 0.001 { ux, uy = dx/dist, dy/dist }; cX, cY := mP[0].X-ux*r, mP[0].Y-uy*r
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pdf.SetStrokeColor(255, 0, 0); pdf.SetLineWidth(0.5); pdf.Oval(cX-r, cY-r, cX+r, cY+r)
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numS := strconv.Itoa(idx+1); tw := fS*0.6*float64(len(numS))/2; if len(numS) > 1 { tw = fS*0.5 }
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pdf.SetFillColor(255, 0, 0); pdf.SetXY(cX-tw/2, cY-fS/2); _ = 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); p, scale := size*0.12, (size-(size*0.12*2))/1024.0
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pdf.SetFillColor(180, 180, 180); for i := 0; i < limit; i++ {
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pts := parseSVGPath(data.Strokes[i], scale, x+p, y+p, flipY); if len(pts) > 2 { pdf.Polygon(pts, "F") }
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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); pdf.SetLineWidth(0.4); pdf.RectFromUpperLeft(x, y, size, size)
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mid := size/2; drawDashedLine(pdf, x, y+mid, x+size, y+mid); 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); pdf.SetLineWidth(0.4); pdf.RectFromUpperLeft(x, y, size, size)
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mid := size/2; drawDashedLine(pdf, x, y+mid, x+size, y+mid); drawDashedLine(pdf, x+mid, y, x+mid, y+size); drawDashedLine(pdf, x, y, x+size, y+size); 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; dx, dy := x2-x1, y2-y1; dist := math.Sqrt(dx*dx + dy*dy); if dist < 0.001 { return }
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ux, uy := dx/dist, dy/dist; for i := 0.0; i < dist; i += dash * 2 { end := i + dash; if end > dist { end = dist }; pdf.Line(x1+ux*i, y1+uy*i, x1+ux*end, y1+uy*end) }
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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); arrowA := math.Pi/6
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p1X := target.X+length*math.Cos(angle+math.Pi+arrowA); p1Y := target.Y+length*math.Sin(angle+math.Pi+arrowA)
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p2X := target.X+length*math.Cos(angle+math.Pi-arrowA); 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)); for i, p := range pts { y := p[1]; if flipY { y = 1024-y }; res[i] = gopdf.Point{X: ox+p[0]*scale, Y: oy+y*scale} }
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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; matches := reSVG.FindAllStringSubmatch(path, -1); 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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if item == "M" || item == "L" {
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if idx+2 < len(matches) {
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x, _ := strconv.ParseFloat(matches[idx+1][0], 64); y, _ := strconv.ParseFloat(matches[idx+2][0], 64); lastX, lastY = x, y
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if flipY { y = 1024 - y }; pts = append(pts, gopdf.Point{X: ox + x*scale, Y: oy + y*scale}); idx += 3
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} else { idx++ }
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} else if item == "C" {
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if idx+6 < len(matches) {
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x1, _ := strconv.ParseFloat(matches[idx+1][0], 64); y1, _ := strconv.ParseFloat(matches[idx+2][0], 64)
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x2, _ := strconv.ParseFloat(matches[idx+3][0], 64); y2, _ := strconv.ParseFloat(matches[idx+4][0], 64)
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x, _ := strconv.ParseFloat(matches[idx+5][0], 64); 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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tx := math.Pow(1-t, 3)*lastX + 3*math.Pow(1-t, 2)*t*x1 + 3*(1-t)*math.Pow(t, 2)*x2 + math.Pow(t, 3)*x
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ty := math.Pow(1-t, 3)*lastY + 3*math.Pow(1-t, 2)*t*y1 + 3*(1-t)*math.Pow(t, 2)*y2 + math.Pow(t, 3)*y
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ty_f := ty; if flipY { ty_f = 1024 - ty }; 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; idx += 7
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} else { idx++ }
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} else if item == "Q" {
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if idx+4 < len(matches) {
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x1, _ := strconv.ParseFloat(matches[idx+1][0], 64); y1, _ := strconv.ParseFloat(matches[idx+2][0], 64)
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x, _ := strconv.ParseFloat(matches[idx+3][0], 64); 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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tx := math.Pow(1-t, 2)*lastX + 2*(1-t)*t*x1 + math.Pow(t, 2)*x
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ty := math.Pow(1-t, 2)*lastY + 2*(1-t)*t*y1 + math.Pow(t, 2)*y
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ty_f := ty; if flipY { ty_f = 1024 - ty }; 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; idx += 5
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} else { idx++ }
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} else { idx++ }
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}
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return pts
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}
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