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[UP-450] Ink annotation example (#225)
* add example code * use paths instead of points * update dependencies
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,137 @@ | ||
| /* | ||
| * Annotate/mark up pages of a PDF file. | ||
| * Add an ink annotation with shape of a checkmark on a page. | ||
| * | ||
| * Run as: go run pdf_annotate_add_ink.go input.pdf output.pdf | ||
| */ | ||
|
|
||
| package main | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "os" | ||
| "time" | ||
|
|
||
| "github.com/unidoc/unipdf/v3/annotator" | ||
| "github.com/unidoc/unipdf/v3/common/license" | ||
| "github.com/unidoc/unipdf/v3/contentstream/draw" | ||
| "github.com/unidoc/unipdf/v3/core" | ||
| "github.com/unidoc/unipdf/v3/model" | ||
| ) | ||
|
|
||
| func init() { | ||
| // Make sure to load your metered License API key prior to using the library. | ||
| // If you need a key, you can sign up and create a free one at https://cloud.unidoc.io | ||
| err := license.SetMeteredKey(os.Getenv(`UNIDOC_LICENSE_API_KEY`)) | ||
| if err != nil { | ||
| panic(err) | ||
| } | ||
| } | ||
|
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| func main() { | ||
| if len(os.Args) < 3 { | ||
| fmt.Printf("go run pdf_annotate_add_ink.go input.pdf output.pdf\n") | ||
| os.Exit(1) | ||
| } | ||
|
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| inputPath := os.Args[1] | ||
| outputPath := os.Args[2] | ||
|
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| paths := []draw.Path{ | ||
| { | ||
| Points: []draw.Point{ | ||
| draw.NewPoint(361.019, 638.415), | ||
| draw.NewPoint(361.488, 637.946), | ||
| draw.NewPoint(363.361, 635.605), | ||
| draw.NewPoint(365.233, 632.796), | ||
| draw.NewPoint(368.043, 629.518), | ||
| draw.NewPoint(371.321, 625.772), | ||
| draw.NewPoint(373.662, 622.494), | ||
| draw.NewPoint(375.535, 620.621), | ||
| draw.NewPoint(376.471, 619.216), | ||
| draw.NewPoint(376.94, 618.28), | ||
| draw.NewPoint(377.408, 618.28), | ||
| draw.NewPoint(377.876, 618.748), | ||
| draw.NewPoint(379.281, 621.089), | ||
| draw.NewPoint(382.09, 627.177), | ||
| draw.NewPoint(386.305, 636.073), | ||
| draw.NewPoint(390.987, 646.843), | ||
| draw.NewPoint(395.201, 655.272), | ||
| draw.NewPoint(397.543, 660.891), | ||
| draw.NewPoint(398.947, 664.168), | ||
| draw.NewPoint(399.884, 666.041), | ||
| draw.NewPoint(400.352, 666.51), | ||
| }, | ||
| }, | ||
| } | ||
|
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| err := annotatePdfAddInk(inputPath, outputPath, paths) | ||
| if err != nil { | ||
| fmt.Printf("Error: %v\n", err) | ||
| os.Exit(1) | ||
| } | ||
|
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| fmt.Printf("Complete, see output file: %s\n", outputPath) | ||
| } | ||
|
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| // Annotate pdf file. | ||
| func annotatePdfAddInk(inputPath string, outputPath string, paths []draw.Path) error { | ||
| // Read the input pdf file. | ||
| f, err := os.Open(inputPath) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| defer f.Close() | ||
|
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| pdfReader, err := model.NewPdfReader(f) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
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| // Process each page using the following callback | ||
| // when generating PdfWriter. | ||
| opt := &model.ReaderToWriterOpts{ | ||
| PageProcessCallback: func(pageNum int, page *model.PdfPage) error { | ||
| inkAnnot, err := annotator.CreateInkAnnotation(annotator.InkAnnotationDef{ | ||
| Paths: paths, | ||
| Color: model.NewPdfColorDeviceRGB(0.89, 0.13, 0.21), | ||
| }) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
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| switch t := inkAnnot.GetContext().(type) { | ||
| case *model.PdfAnnotationInk: | ||
| t.T = core.MakeName("InkAnnot") | ||
|
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| creationDate, err := model.NewPdfDateFromTime(time.Now()) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
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| t.CreationDate = creationDate.ToPdfObject() | ||
| t.M = creationDate.ToPdfObject() | ||
| t.P = page.ToPdfObject() | ||
| } | ||
|
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| // Add to the page annotations. | ||
| page.AddAnnotation(inkAnnot) | ||
|
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| return nil | ||
| }, | ||
| } | ||
|
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| // Generate a PdfWriter instance from existing PdfReader. | ||
| pdfWriter, err := pdfReader.ToWriter(opt) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
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| // Write to file. | ||
| err = pdfWriter.WriteToFile(outputPath) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| return nil | ||
| } |
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