220 lines
7.6 KiB
Go
220 lines
7.6 KiB
Go
package logic
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import (
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"bytes"
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"math"
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"math/rand"
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"regexp"
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"strconv"
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"strings"
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"time"
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"toolbox/pkg/learnnumber/data"
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"github.com/signintech/gopdf"
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)
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type CountingRequest struct {
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TotalCount int `json:"total_count"`
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IconTypes int `json:"icon_types"`
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PageCount int `json:"page_count"`
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Category string `json:"category"`
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PaperSize string `json:"paper_size"`
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}
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type PlacedIcon struct {
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X, Y, Radius float64
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}
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type PathResult struct {
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Points []gopdf.Point
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Closed bool
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}
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var reSVGToken = regexp.MustCompile(`[a-zA-Z]|-?\d+\.?\d*`)
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func GenerateCountingPDF(req CountingRequest) ([]byte, error) {
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rand.Seed(time.Now().UnixNano())
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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 req.PaperSize == "Letter" { rect = gopdf.Rect{W: 612, H: 792} }
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pdf.Start(gopdf.Config{PageSize: rect})
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// 硬性限制：页数 1-10 页，防止资源耗尽
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if req.PageCount < 1 { req.PageCount = 1 }
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if req.PageCount > 10 { req.PageCount = 10 }
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for i := 0; i < req.PageCount; i++ {
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pdf.AddPage()
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drawProblemV4(pdf, req, 0, rect.W, rect.H/2)
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drawProblemV4(pdf, req, rect.H/2, rect.W, rect.H/2)
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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 drawProblemV4(pdf *gopdf.GoPdf, req CountingRequest, startY, pW, pH float64) {
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margin := 40.0
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boxW, boxH := (pW-2*margin)*0.7, pH-60.0
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xBase, yBase := margin, startY + 30.0
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pdf.SetStrokeColor(0, 0, 0); pdf.SetLineWidth(2.5)
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pdf.RectFromUpperLeft(xBase, yBase, boxW, boxH)
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catIcons := data.IconCategories[req.Category]
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if len(catIcons) == 0 { catIcons = data.IconCategories["shapes"] }
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numTypes := req.IconTypes
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if numTypes < 1 { numTypes = 1 }; if numTypes > 6 { numTypes = 6 }
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if numTypes > len(catIcons) { numTypes = len(catIcons) }
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total := req.TotalCount
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if total < numTypes { total = numTypes }; if total > 30 { total = 30 }
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allIconsPerm := rand.Perm(len(catIcons))
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var selectedIcons []data.Icon
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counts := make([]int, numTypes)
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// 随机分配逻辑
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for i := 0; i < numTypes; i++ {
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selectedIcons = append(selectedIcons, catIcons[allIconsPerm[i]])
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counts[i] = 1
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}
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remaining := total - numTypes
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for i := 0; i < remaining; i++ {
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counts[rand.Intn(numTypes)]++
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}
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avgRadius := math.Sqrt((boxW * boxH * 0.22) / (float64(total) * math.Pi))
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if avgRadius > 35.0 { avgRadius = 35.0 }
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var placed []PlacedIcon
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iconTypeIdx, currentInType := 0, 0
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for i := 0; i < total; i++ {
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scaleVar := 0.9 + rand.Float64()*0.2; r := avgRadius * scaleVar
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for retry := 0; retry < 200; retry++ {
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randX := xBase + r + 5 + rand.Float64()*(boxW-2*r-10)
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randY := yBase + r + 5 + rand.Float64()*(boxH-2*r-10)
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collision := false
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for _, p := range placed {
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if math.Sqrt(math.Pow(randX-p.X, 2)+math.Pow(randY-p.Y, 2)) < (r + p.Radius + 10.0) {
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collision = true; break
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}
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}
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if !collision {
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drawSimpleIcon(pdf, selectedIcons[iconTypeIdx], randX, randY, r*2)
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placed = append(placed, PlacedIcon{X: randX, Y: randY, Radius: r}); break
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}
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}
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currentInType++; if currentInType >= counts[iconTypeIdx] { iconTypeIdx++; currentInType = 0 }
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}
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legendX, legendStepY := xBase+boxW+20.0, boxH/float64(numTypes+1)
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for i := 0; i < numTypes; i++ {
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lY := yBase + float64(i+1)*legendStepY
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drawSimpleIcon(pdf, selectedIcons[i], legendX+25, lY, 35)
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pdf.SetStrokeColor(150, 150, 150); pdf.SetLineWidth(1.0); pdf.RectFromUpperLeft(legendX+60, lY-15, 35, 35)
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}
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}
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func drawSimpleIcon(pdf *gopdf.GoPdf, icon data.Icon, cX, cY, size float64) {
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rawResults := parseMultiPath(icon, 1.0, 0, 0)
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if len(rawResults) == 0 { return }
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var minX, minY, maxX, maxY float64 = 1e9, 1e9, -1e9, -1e9
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for _, res := range rawResults {
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for _, p := range res.Points {
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if p.X < minX { minX = p.X }; if p.X > maxX { maxX = p.X }
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if p.Y < minY { minY = p.Y }; if p.Y > maxY { maxY = p.Y }
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}
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}
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curW, curH := maxX-minX, maxY-minY
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if curW <= 0 { curW = 1 }; if curH <= 0 { curH = 1 }
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scale := size / math.Max(curW, curH)
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ox, oy := cX-(curW*scale)/2-minX*scale, cY-(curH*scale)/2-minY*scale
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pdf.SetStrokeColor(0, 0, 0)
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if strings.Contains(strings.ToLower(icon.Name), "item") || len(icon.Paths) > 1 {
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pdf.SetLineWidth(size / 60.0) // 复杂素材用细线 (30% less than 45 is approx 60)
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} else {
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pdf.SetLineWidth(size / 22.0) // 基础图形用粗线
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}
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for _, res := range rawResults {
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scaledPts := make([]gopdf.Point, len(res.Points))
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for i, p := range res.Points { scaledPts[i] = gopdf.Point{X: ox + p.X*scale, Y: oy + p.Y*scale} }
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if len(scaledPts) > 1 {
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if res.Closed { pdf.Polygon(scaledPts, "D") } else {
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for j := 0; j < len(scaledPts)-1; j++ { pdf.Line(scaledPts[j].X, scaledPts[j].Y, scaledPts[j+1].X, scaledPts[j+1].Y) }
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}
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}
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}
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}
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func parseMultiPath(icon data.Icon, scale, ox, oy float64) []PathResult {
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var results []PathResult
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for _, path := range icon.Paths {
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tokens := reSVGToken.FindAllString(path, -1)
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var lx, ly, startX, startY float64
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var pts []gopdf.Point
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var currentCmd string
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var isRel bool
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for i := 0; i < len(tokens); {
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token := tokens[i]
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if (token[0] >= 'a' && token[0] <= 'z') || (token[0] >= 'A' && token[0] <= 'Z') {
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cmd := strings.ToUpper(token)
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if cmd == "M" {
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if len(pts) > 0 { results = append(results, PathResult{Points: pts, Closed: false}); pts = nil }
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} else if cmd == "Z" {
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if len(pts) > 0 { results = append(results, PathResult{Points: pts, Closed: true}); pts = nil }
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lx, ly = startX, startY; i++; continue
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}
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currentCmd = cmd; isRel = (token[0] >= 'a' && token[0] <= 'z'); i++
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continue
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}
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switch currentCmd {
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case "M", "L":
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if i+1 >= len(tokens) { i = len(tokens); break }
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x, _ := strconv.ParseFloat(tokens[i], 64); y, _ := strconv.ParseFloat(tokens[i+1], 64)
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if isRel { x += lx; y += ly }
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if currentCmd == "M" { startX, startY = x, y }
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lx, ly = x, y
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pts = append(pts, gopdf.Point{X: ox + x*scale, Y: oy + y*scale}); i += 2
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if currentCmd == "M" { currentCmd = "L" }
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case "H":
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x, _ := strconv.ParseFloat(tokens[i], 64); if isRel { x += lx }; lx = x
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pts = append(pts, gopdf.Point{X: ox + x*scale, Y: oy + ly*scale}); i++
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case "V":
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y, _ := strconv.ParseFloat(tokens[i], 64); if isRel { y += ly }; ly = y
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pts = append(pts, gopdf.Point{X: ox + lx*scale, Y: oy + y*scale}); i++
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case "C":
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if i+5 >= len(tokens) { i = len(tokens); break }
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x1, _ := strconv.ParseFloat(tokens[i], 64); y1, _ := strconv.ParseFloat(tokens[i+1], 64)
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x2, _ := strconv.ParseFloat(tokens[i+2], 64); y2, _ := strconv.ParseFloat(tokens[i+3], 64)
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x, _ := strconv.ParseFloat(tokens[i+4], 64); y, _ := strconv.ParseFloat(tokens[i+5], 64)
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if isRel { x1 += lx; y1 += ly; x2 += lx; y2 += ly; x += lx; y += ly }
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for t := 0.2; t <= 1.0; t += 0.2 {
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tx := math.Pow(1-t, 3)*lx + 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)*ly + 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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pts = append(pts, gopdf.Point{X: ox + tx*scale, Y: oy + ty*scale})
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}
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lx, ly = x, y; i += 6
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case "Q":
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if i+3 >= len(tokens) { i = len(tokens); break }
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x1, _ := strconv.ParseFloat(tokens[i], 64); y1, _ := strconv.ParseFloat(tokens[i+1], 64)
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x, _ := strconv.ParseFloat(tokens[i+2], 64); y, _ := strconv.ParseFloat(tokens[i+3], 64)
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if isRel { x1 += lx; y1 += ly; x += lx; y += ly }
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for t := 0.25; t <= 1.0; t += 0.25 {
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tx := math.Pow(1-t, 2)*lx + 2*(1-t)*t*x1 + math.Pow(t, 2)*x
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ty := math.Pow(1-t, 2)*ly + 2*(1-t)*t*y1 + math.Pow(t, 2)*y
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pts = append(pts, gopdf.Point{X: ox + tx*scale, Y: oy + ty*scale})
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}
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lx, ly = x, y; i += 4
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case "A": i += 7
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default: i++
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}
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}
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if len(pts) > 0 { results = append(results, PathResult{Points: pts, Closed: false}) }
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}
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return results
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}
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