Initial commit: Modular personal toolbox with high-fidelity Chinese stroke order tool and CI/CD
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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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)
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var embeddedFont []byte
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func SetFontData(data []byte) {
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embeddedFont = data
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}
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// GeneratePDF 生成 PDF 字节流
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func GeneratePDF(chars []HanziData, mode, paperSize string, flipY bool) ([]byte, error) {
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pdf := &gopdf.GoPdf{}
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rect := gopdf.Rect{W: 595.28, H: 841.89} // A4 default
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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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if mode == "step" {
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addStepPages(pdf, chars, flipY, rect.W, rect.H)
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} else {
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addTeachingPages(pdf, chars, flipY, 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, rows := 2, 3
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gap := 17.0
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margin := 40.0
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cellW := (pW - 2*margin - float64(cols-1)*gap) / float64(cols)
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cellH := (pH - 2*margin - float64(rows-1)*gap) / float64(rows)
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size := math.Min(cellW, cellH)
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totalW := float64(cols)*size + float64(cols-1)*gap
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totalH := float64(rows)*size + float64(rows-1)*gap
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marginX := (pW - totalW) / 2
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marginY := (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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batch := chars[i:end]
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for idx, data := range batch {
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c, r := idx%cols, idx/cols
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x := marginX + float64(c)*(size+gap)
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y := marginY + float64(r)*(size+gap)
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drawCharacter(pdf, data, x, y, 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 := 9
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margin := 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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numStrokes := len(data.Strokes)
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rowsNeeded := 1
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if numStrokes > 8 {
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rowsNeeded = 1 + (numStrokes - 8 + 7) / 8
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}
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if currY + float64(rowsNeeded)*size > pH - margin {
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pdf.AddPage()
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currY = margin
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}
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totalGridsInRows := rowsNeeded * cols
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strokeCounter := 0
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for gridIdx := 0; gridIdx < totalGridsInRows; gridIdx++ {
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rowInChar := gridIdx / cols
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colInChar := gridIdx % cols
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x := margin + float64(colInChar)*size
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y := currY + float64(rowInChar)*size
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if rowInChar == 0 && colInChar == 0 {
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drawCharacter(pdf, data, x, y, size, flipY, len(data.Strokes), false)
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strokeCounter = 1
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} else if rowInChar > 0 && colInChar == 0 {
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drawMiZiGe(pdf, x, y, size)
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} else if strokeCounter <= numStrokes {
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drawStepBox(pdf, data, x, y, size, flipY, strokeCounter)
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strokeCounter++
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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(rowsNeeded) * size
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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, strokeLimit int) {
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drawMiZiGe(pdf, x, y, size)
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padding := size * 0.12
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drawSize := size - 2*padding
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scale := drawSize / 1024.0
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offsetX := x + padding
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offsetY := y + padding
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pdf.SetFillColor(180, 180, 180)
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for i := 0; i < strokeLimit; i++ {
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points := parseSVGPath(data.Strokes[i], scale, offsetX, offsetY, flipY)
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if len(points) > 2 {
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pdf.Polygon(points, "F")
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}
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}
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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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padding := size * 0.12
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drawSize := size - 2*padding
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scale := drawSize / 1024.0
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offsetX := x + padding
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offsetY := y + padding
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isFull := strokeLimit == len(data.Strokes)
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if isFull {
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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 && !isFull {
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break
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}
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points := parseSVGPath(data.Strokes[sIdx], scale, offsetX, offsetY, flipY)
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if len(points) > 2 {
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pdf.Polygon(points, "F")
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}
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}
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if showAnnotations && isFull {
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fontSize := size * 0.035
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if len(embeddedFont) > 0 {
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_ = pdf.SetFont("font", "", fontSize)
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}
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for idx, median := range data.Medians {
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mPoints := transformPoints(median, scale, offsetX, offsetY, flipY)
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if len(mPoints) < 2 { continue }
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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(mPoints)-1; j++ {
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pdf.Line(mPoints[j].X, mPoints[j].Y, mPoints[j+1].X, mPoints[j+1].Y)
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}
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pdf.SetFillColor(255, 0, 0)
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drawArrow(pdf, mPoints[len(mPoints)-1], mPoints[len(mPoints)-2], size * 0.035)
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startP, nextP := mPoints[0], mPoints[1]
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r := size * 0.025
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dx, dy := nextP.X-startP.X, nextP.Y-startP.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 { ux, uy = dx/dist, dy/dist }
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centerX, centerY := startP.X - ux*r, startP.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(centerX - r, centerY - r, centerX + r, centerY + r)
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if len(embeddedFont) > 0 {
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numStr := strconv.Itoa(idx+1)
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tw := fontSize * 0.6 * float64(len(numStr)) / 2
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if len(numStr) > 1 { tw = fontSize * 0.5 }
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pdf.SetFillColor(255, 0, 0)
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pdf.SetXY(centerX - tw/2, centerY - fontSize/2)
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_ = pdf.Cell(nil, numStr)
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}
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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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dashLen := 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 { return }
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ux, uy := dx/dist, dy/dist
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for i := 0.0; i < dist; i += dashLen * 2 {
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end := i + dashLen
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if end > dist { end = dist }
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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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arrowAngle := math.Pi / 6
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p1X := target.X + length*math.Cos(angle+math.Pi+arrowAngle)
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p1Y := target.Y + length*math.Sin(angle+math.Pi+arrowAngle)
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p2X := target.X + length*math.Cos(angle+math.Pi-arrowAngle)
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p2Y := target.Y + length*math.Sin(angle+math.Pi-arrowAngle)
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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 { y = 1024 - y }
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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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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)
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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 { y = 1024 - y }
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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 { idx++ }
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} else if item == "C" {
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// Cubic Bezier: C x1 y1 x2 y2 x y
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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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// Sample points along the curve
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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_final := ty
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if flipY { ty_final = 1024 - ty }
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pts = append(pts, gopdf.Point{X: ox + tx*scale, Y: oy + ty_final*scale})
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}
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lastX, lastY = x, y
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idx += 7
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} else { idx++ }
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} else if item == "Q" {
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// Quadratic Bezier: Q x1 y1 x y
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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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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_final := ty
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if flipY { ty_final = 1024 - ty }
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pts = append(pts, gopdf.Point{X: ox + tx*scale, Y: oy + ty_final*scale})
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}
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lastX, lastY = x, y
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idx += 5
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} else { idx++ }
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} else if item == "Z" {
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idx++
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} else {
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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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