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/*
* Extract vector lines and other paths for each page of a PDF file.
*
* Run as: go run pdf_extract_lines.go input.pdf
*/
package main
import (
"fmt"
"os"
"github.com/unidoc/unipdf/v4/creator"
"github.com/unidoc/unipdf/v4/extractor"
"github.com/unidoc/unipdf/v4/model"
)
func main() {
// err := reconstruct("../../test.pdf")
// if err != nil {
// fmt.Printf("Error: %v\n", err)
// os.Exit(1)
// }
err := outputPdfLines("reconstr_words.pdf")
if err != nil {
fmt.Printf("Error: %v\n", err)
os.Exit(1)
}
}
// outputPdfLines prints out lines of PDF file to stdout.
func outputPdfLines(inputPath string) error {
f, err := os.Open(inputPath)
if err != nil {
return err
}
defer f.Close()
pdfReader, err := model.NewPdfReader(f)
if err != nil {
return err
}
numPages, err := pdfReader.GetNumPages()
if err != nil {
return err
}
// Iterate through pages.
fmt.Printf("--------------------\n")
fmt.Printf("PDF lines extraction:\n")
fmt.Printf("--------------------\n")
for i := 0; i < numPages; i++ {
pageNum := i + 1
page, err := pdfReader.GetPage(pageNum)
if err != nil {
return err
}
ex, err := extractor.New(page)
if err != nil {
return err
}
fmt.Println("------------------------------")
fmt.Printf("Page %d:\n", pageNum)
// Extract stroke paths from the current page.
paths, err := ex.ExtractStrokePaths()
if err != nil {
return err
}
// Print debugging info.
for i, path := range paths {
fmt.Printf("Path %d:\n", i)
for j, point := range path.Points {
fmt.Printf("Point %d: %f %f \n", j, point.X, point.Y)
}
}
}
return nil
}
func reconstruct(pdfPath string) error {
f, err := os.Open(pdfPath)
if err != nil {
return err
}
defer f.Close()
pdfr, err := model.NewPdfReaderLazy(f)
if err != nil {
return err
}
c := creator.New()
for pageNum := 1; pageNum <= len(pdfr.PageList); pageNum++ {
page, err := pdfr.GetPage(pageNum)
if err != nil {
return err
}
extr, err := extractor.New(page)
if err != nil {
return err
}
pageText, _, _, err := extr.ExtractPageText()
if err != nil {
return err
}
// Start on a new page.
c.NewPage()
fmt.Printf("Page %d\n", pageNum)
text := pageText.Text()
textmarks := pageText.Marks()
fmt.Printf("%s\n", text)
// Reconstruct the text, each single TextMark drawn at a time with creator.Paragraph.
for _, tm := range textmarks.Elements() {
if tm.Font == nil {
continue
}
fmt.Printf("%s\n", tm.Text)
// Reconstruct by drawing each glyph from textmarks with the creator package.
para := c.NewStyledParagraph()
para.SetText(tm.Original)
para.SetFont(tm.Font)
para.SetFontSize(tm.FontSize)
r, g, b, _ := tm.StrokeColor.RGBA()
rf, gf, bf := float64(r)/0xffff, float64(g)/0xffff, float64(b)/0xffff
para.SetFontColor(creator.ColorRGBFromArithmetic(rf, gf, bf))
// Convert to PDF coordinate system.
yPos := c.Context().PageHeight - (tm.BBox.Lly + tm.BBox.Height())
para.SetPos(tm.BBox.Llx, yPos) // Upper left corner.
c.Draw(para)
}
}
return c.WriteToFile("reconstr_words.pdf")
}
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