mirror of
https://github.com/unidoc/unipdf.git
synced 2025-04-26 13:48:55 +08:00
58 lines
1.3 KiB
Go
58 lines
1.3 KiB
Go
/*
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* This file is subject to the terms and conditions defined in
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* file 'LICENSE.md', which is part of this source code package.
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*/
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package creator
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import (
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"os"
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"github.com/unidoc/unipdf/v3/contentstream/draw"
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"github.com/unidoc/unipdf/v3/model"
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)
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// Loads the template from path as a list of pages.
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func loadPagesFromFile(f *os.File) ([]*model.PdfPage, error) {
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pdfReader, err := model.NewPdfReader(f)
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if err != nil {
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return nil, err
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}
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numPages, err := pdfReader.GetNumPages()
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if err != nil {
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return nil, err
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}
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// Load the pages.
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var pages []*model.PdfPage
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for i := 0; i < numPages; i++ {
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page, err := pdfReader.GetPage(i + 1)
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if err != nil {
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return nil, err
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}
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pages = append(pages, page)
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}
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return pages, nil
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}
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// Rotates rectangle (0,0,w,h) by the specified angle and returns the its
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// bounding box. The origin of rotation is the top left corner of the rectangle.
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func rotateRect(w, h, angle float64) (x, y, rotatedWidth, rotatedHeight float64) {
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if angle == 0 {
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return 0, 0, w, h
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}
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// Get rotated size
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bbox := draw.Path{Points: []draw.Point{
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draw.NewPoint(0, 0).Rotate(angle),
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draw.NewPoint(w, 0).Rotate(angle),
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draw.NewPoint(0, h).Rotate(angle),
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draw.NewPoint(w, h).Rotate(angle),
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}}.GetBoundingBox()
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return bbox.X, bbox.Y, bbox.Width, bbox.Height
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}
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