From e697c5fb90d8afbc84be98bfec2154653e03382b Mon Sep 17 00:00:00 2001 From: matthias Date: Tue, 13 Aug 2019 14:03:28 +0200 Subject: wrap contrib/gofpdi:realgofpdi.Importer * allow for multiple independent Importer instances * keep a default Importer for backwards compatibility * add package level comment --- contrib/gofpdi/gofpdi.go | 87 +++++++++++++++++++++++++++++++++++++++--------- 1 file changed, 71 insertions(+), 16 deletions(-) diff --git a/contrib/gofpdi/gofpdi.go b/contrib/gofpdi/gofpdi.go index e600fb1..7b9c822 100644 --- a/contrib/gofpdi/gofpdi.go +++ b/contrib/gofpdi/gofpdi.go @@ -1,3 +1,11 @@ +/* +Package gofpdi wraps the gofpdi PDF library to import existing PDFs as templates. See github.com/phpdave11/gofpdi +for further information and examples. + +Users should call NewImporter() to obtain their own Importer instance to work with. +To retain backwards compatibility, the package offers a default Importer that may be used via global functions. Note +however that use of the default Importer is not thread safe. +*/ package gofpdi import ( @@ -5,9 +13,6 @@ import ( "io" ) -// Create new gofpdi instance -var fpdi = realgofpdi.NewImporter() - // gofpdiPdf is a partial interface that only implements the functions we need // from the PDF generator to put the imported PDF templates on the PDF. type gofpdiPdf interface { @@ -18,49 +23,61 @@ type gofpdiPdf interface { SetError(err error) } +// Importer wraps an Importer from the gofpdi library. +type Importer struct { + fpdi *realgofpdi.Importer +} + +// NewImporter creates a new Importer wrapping functionality from the gofpdi library. +func NewImporter() *Importer { + return &Importer{ + fpdi: realgofpdi.NewImporter(), + } +} + // ImportPage imports a page of a PDF file with the specified box (/MediaBox, // /TrimBox, /ArtBox, /CropBox, or /BleedBox). Returns a template id that can // be used with UseImportedTemplate to draw the template onto the page. -func ImportPage(f gofpdiPdf, sourceFile string, pageno int, box string) int { +func (i *Importer) ImportPage(f gofpdiPdf, sourceFile string, pageno int, box string) int { // Set source file for fpdi - fpdi.SetSourceFile(sourceFile) + i.fpdi.SetSourceFile(sourceFile) // return template id - return getTemplateID(f, pageno, box) + return i.getTemplateID(f, pageno, box) } // ImportPageFromStream imports a page of a PDF with the specified box // (/MediaBox, TrimBox, /ArtBox, /CropBox, or /BleedBox). Returns a template id // that can be used with UseImportedTemplate to draw the template onto the // page. -func ImportPageFromStream(f gofpdiPdf, rs *io.ReadSeeker, pageno int, box string) int { +func (i *Importer) ImportPageFromStream(f gofpdiPdf, rs *io.ReadSeeker, pageno int, box string) int { // Set source stream for fpdi - fpdi.SetSourceStream(rs) + i.fpdi.SetSourceStream(rs) // return template id - return getTemplateID(f, pageno, box) + return i.getTemplateID(f, pageno, box) } -func getTemplateID(f gofpdiPdf, pageno int, box string) int { +func (i *Importer) getTemplateID(f gofpdiPdf, pageno int, box string) int { // Import page - tpl := fpdi.ImportPage(pageno, box) + tpl := i.fpdi.ImportPage(pageno, box) // Import objects into current pdf document // Unordered means that the objects will be returned with a sha1 hash instead of an integer // The objects themselves may have references to other hashes which will be replaced in ImportObjects() - tplObjIDs := fpdi.PutFormXobjectsUnordered() + tplObjIDs := i.fpdi.PutFormXobjectsUnordered() // Set template names and ids (hashes) in gofpdf f.ImportTemplates(tplObjIDs) // Get a map[string]string of the imported objects. // The map keys will be the ID of each object. - imported := fpdi.GetImportedObjectsUnordered() + imported := i.fpdi.GetImportedObjectsUnordered() // Import gofpdi objects into gofpdf f.ImportObjects(imported) // Get a map[string]map[int]string of the object hashes and their positions within each object, // to be replaced with object ids (integers). - importedObjPos := fpdi.GetImportedObjHashPos() + importedObjPos := i.fpdi.GetImportedObjHashPos() // Import gofpdi object hashes and their positions into gopdf f.ImportObjPos(importedObjPos) @@ -71,9 +88,9 @@ func getTemplateID(f gofpdiPdf, pageno int, box string) int { // UseImportedTemplate draws the template onto the page at x,y. If w is 0, the // template will be scaled to fit based on h. If h is 0, the template will be // scaled to fit based on w. -func UseImportedTemplate(f gofpdiPdf, tplid int, x float64, y float64, w float64, h float64) { +func (i *Importer) UseImportedTemplate(f gofpdiPdf, tplid int, x float64, y float64, w float64, h float64) { // Get values from fpdi - tplName, scaleX, scaleY, tX, tY := fpdi.UseTemplate(tplid, x, y, w, h) + tplName, scaleX, scaleY, tX, tY := i.fpdi.UseTemplate(tplid, x, y, w, h) f.UseImportedTemplate(tplName, scaleX, scaleY, tX, tY) } @@ -83,6 +100,44 @@ func UseImportedTemplate(f gofpdiPdf, tplid int, x float64, y float64, w float64 // : page number, note that page numbers start at 1 // : box identifier, e.g. "/MediaBox" // : dimension string, either "w" or "h" +func (i *Importer) GetPageSizes() map[int]map[string]map[string]float64 { + return i.fpdi.GetPageSizes() +} + +// Default Importer used by global functions +var fpdi = NewImporter() + +// ImportPage imports a page of a PDF file with the specified box (/MediaBox, +// /TrimBox, /ArtBox, /CropBox, or /BleedBox). Returns a template id that can +// be used with UseImportedTemplate to draw the template onto the page. +// Note: This uses the default Importer. Call NewImporter() to obtain a custom Importer. +func ImportPage(f gofpdiPdf, sourceFile string, pageno int, box string) int { + return fpdi.ImportPage(f, sourceFile, pageno, box) +} + +// ImportPageFromStream imports a page of a PDF with the specified box +// (/MediaBox, TrimBox, /ArtBox, /CropBox, or /BleedBox). Returns a template id +// that can be used with UseImportedTemplate to draw the template onto the +// page. +// Note: This uses the default Importer. Call NewImporter() to obtain a custom Importer. +func ImportPageFromStream(f gofpdiPdf, rs *io.ReadSeeker, pageno int, box string) int { + return fpdi.ImportPageFromStream(f, rs, pageno, box) +} + +// UseImportedTemplate draws the template onto the page at x,y. If w is 0, the +// template will be scaled to fit based on h. If h is 0, the template will be +// scaled to fit based on w. +// Note: This uses the default Importer. Call NewImporter() to obtain a custom Importer. +func UseImportedTemplate(f gofpdiPdf, tplid int, x float64, y float64, w float64, h float64) { + fpdi.UseImportedTemplate(f, tplid, x, y, w, h) +} + +// GetPageSizes returns page dimensions for all pages of the imported pdf. +// Result consists of map[]map[]map[]. +// : page number, note that page numbers start at 1 +// : box identifier, e.g. "/MediaBox" +// : dimension string, either "w" or "h" +// Note: This uses the default Importer. Call NewImporter() to obtain a custom Importer. func GetPageSizes() map[int]map[string]map[string]float64 { return fpdi.GetPageSizes() } -- cgit v1.2.1-24-ge1ad