32 lines
1002 B
TypeScript
32 lines
1002 B
TypeScript
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import { degrees } from 'pdf-lib';
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import { PdfFile } from '../wrappers/PdfFile';
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export type RotateParamsType = {
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file: PdfFile;
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rotation: number|number[];
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}
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export async function rotatePages(params: RotateParamsType): Promise<PdfFile> {
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const { file, rotation } = params;
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const pages = (await file.pdfLibDocument).getPages();
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if (Array.isArray(rotation)) {
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if (rotation.length != pages.length) {
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throw new Error(`Number of given rotations '${rotation.length}' is not the same as the number of pages '${pages.length}'`)
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}
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for (let i=0; i<rotation.length; i++) {
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const oldRotation = pages[i].getRotation().angle
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pages[i].setRotation(degrees(oldRotation + rotation[i]))
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}
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} else {
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pages.forEach(page => {
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// Change page size
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const oldRotation = page.getRotation().angle
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page.setRotation(degrees(oldRotation + rotation))
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});
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}
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return file;
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}; |