rotate Method

Summary

Rotates this page by the specified angle.

Syntax
TypeScript
JavaScript
DocumentPage.prototype.rotate = function( 
   angle 
) 
rotate( 
   angle: number 
): void; 

Parameters

angle

Rotation angle in degrees. Positive values will rotate the page clockwise and negative values will rotate the page counter-clockwise. Must be an increment of 90 degrees.

Remarks

This method changes the value of viewPerspective based on the previous value and angle.

Refer to Document Page Transformation for more information.

Example

This example loads a document, rotates it, and then flips a couple of pages before exporting it to a new PDF.

Start with the example from LEADDocument and replace all the code inside the example function (search for the "// TODO: add example code here" comment) with the following code:

Rotate.ts
DocumentHelper.ts
Rotate.js
DocumentHelper.js
Rotate.html
import { DocumentHelper } from "../../utilities/DocumentHelper"; 
 
export class LEADDocument_RotateExample { 
   public constructor() { 
      lt.RasterSupport.setLicenseUri("https://demo.leadtools.com/licenses/v200/LEADTOOLSEVAL.txt", "EVAL", null); 
      DocumentHelper.initFactory(); 
   } 
 
   public run = (buttonID: string) => { 
      const exampleButton = document.getElementById(buttonID); 
      exampleButton.onclick = this.rotatePage; 
   } 
 
   rotatePage = () => { 
      const url = "https://demo.leadtools.com/images/pdf/leadtools.pdf";; 
      const loadDocumentOptions = new lt.Document.LoadDocumentOptions(); 
 
      DocumentHelper.log("Loading document..."); 
      lt.Document.DocumentFactory.loadFromUri(url, loadDocumentOptions) 
         .done((doc) => { 
            DocumentHelper.log("Loaded, converting..."); 
            // LEADDocument is read-only by default, so: 
            doc.isReadOnly = false; 
            // Rotate the first page by 90 
            let docPage = doc.pages.item(0); 
            docPage.rotate(90); 
            // Flip the second page vertically 
            docPage = doc.pages.item(1); 
            docPage.flip(); 
            // Save it to the cache 
            lt.Document.DocumentFactory.saveToCache(doc) 
               .done(() => { 
                  // Convert it to PDF 
                  const jobData = new lt.Document.DocumentConverterJobData(); 
                  jobData.documentFormat = lt.Document.Writer.DocumentFormat.pdf; 
                  jobData.rasterImageFormat = lt.Document.RasterImageFormat.unknown; 
                  // Set document options 
                  const docxOptions = new lt.Document.Writer.DocxDocumentOptions(); 
                  docxOptions.textMode = lt.Document.Writer.DocumentTextMode.auto; 
                  jobData.documentOptions = docxOptions; 
                  doc.convert(jobData) 
                     .done((result) => { 
                        // This is generic code, we know the result is in "document" since DOCX supports that 
                        // But this code checks if the results have been archived into a ZIP file if this 
                        // example was converting to, say SVG 
                        const resultDocument = result.document != null ? result.document.url : result.archive.url; 
                        const link = document.createElement("a"); 
                        const url = lt.Document.DocumentFactory.serviceUri + "/" + resultDocument; 
                        link.href = url; 
                        link.innerHTML = url; 
                        link.target = "_default"; 
                        DocumentHelper.log("Converted: " + url, url); 
                     }) 
                     .fail(DocumentHelper.showServiceError); 
               }) 
               .fail(DocumentHelper.showServiceError); 
         }) 
         .fail(DocumentHelper.showServiceError); 
   } 
} 
export class DocumentHelper { 
   static showServiceError = (jqXHR, statusText, errorThrown) => { 
      alert("Error returned from service. See the console for details."); 
      const serviceError = lt.Document.ServiceError.parseError(jqXHR, statusText, errorThrown); 
      console.error(serviceError); 
   } 
 
   static log = (message: string, data?: any) => { 
      const outputElement = document.getElementById("output"); 
      if (outputElement) { 
         const time = (new Date()).toLocaleTimeString(); 
         const textElement = document.createElement("p"); 
         textElement.innerHTML = (outputElement.childElementCount + 1) + " [" + time + "]: " + message; 
         outputElement.insertBefore(textElement, outputElement.firstChild); 
      } 
 
      if (!data) 
         console.log(message); 
      else 
         console.log(message, data); 
   } 
 
   static initFactory = () => { 
      // To communicate with the DocumentsService, it must be running! 
      // Change these parameters to match the path to the service. 
      lt.Document.DocumentFactory.serviceHost = "http://localhost:40000"; 
      lt.Document.DocumentFactory.servicePath = ""; 
      lt.Document.DocumentFactory.serviceApiPath = "api"; 
   } 
} 
import { DocumentHelper } from "../../utilities/DocumentHelper"; 
 
export class LEADDocument_RotateExample { 
   constructor() { 
      lt.RasterSupport.setLicenseUri("https://demo.leadtools.com/licenses/v200/LEADTOOLSEVAL.txt", "EVAL", null); 
      DocumentHelper.initFactory(); 
   } 
 
   run = (buttonID) => { 
      const exampleButton = document.getElementById(buttonID); 
      exampleButton.onclick = this.rotatePage; 
   } 
 
   rotatePage = () => { 
      const url = "https://demo.leadtools.com/images/pdf/leadtools.pdf";; 
      const loadDocumentOptions = new lt.Document.LoadDocumentOptions(); 
 
      DocumentHelper.log("Loading document..."); 
      lt.Document.DocumentFactory.loadFromUri(url, loadDocumentOptions) 
         .done((doc) => { 
            DocumentHelper.log("Loaded, converting..."); 
            // LEADDocument is read-only by default, so: 
            doc.isReadOnly = false; 
            // Rotate the first page by 90 
            let docPage = doc.pages.item(0); 
            docPage.rotate(90); 
            // Flip the second page vertically 
            docPage = doc.pages.item(1); 
            docPage.flip(); 
            // Save it to the cache 
            lt.Document.DocumentFactory.saveToCache(doc) 
               .done(() => { 
                  // Convert it to PDF 
                  const jobData = new lt.Document.DocumentConverterJobData(); 
                  jobData.documentFormat = lt.Document.Writer.DocumentFormat.pdf; 
                  jobData.rasterImageFormat = lt.Document.RasterImageFormat.unknown; 
                  // Set document options 
                  const docxOptions = new lt.Document.Writer.DocxDocumentOptions(); 
                  docxOptions.textMode = lt.Document.Writer.DocumentTextMode.auto; 
                  jobData.documentOptions = docxOptions; 
                  doc.convert(jobData) 
                     .done((result) => { 
                        // This is generic code, we know the result is in "document" since DOCX supports that 
                        // But this code checks if the results have been archived into a ZIP file if this 
                        // example was converting to, say SVG 
                        const resultDocument = result.document != null ? result.document.url : result.archive.url; 
                        const link = document.createElement("a"); 
                        const url = lt.Document.DocumentFactory.serviceUri + "/" + resultDocument; 
                        link.href = url; 
                        link.innerHTML = url; 
                        link.target = "_default"; 
                        DocumentHelper.log("Converted: " + url, url); 
                     }) 
                     .fail(DocumentHelper.showServiceError); 
               }) 
               .fail(DocumentHelper.showServiceError); 
         }) 
         .fail(DocumentHelper.showServiceError); 
   } 
} 
export class DocumentHelper { 
   static showServiceError = (jqXHR, statusText, errorThrown) => { 
      alert("Error returned from service. See the console for details."); 
      const serviceError = lt.Document.ServiceError.parseError(jqXHR, statusText, errorThrown); 
      console.error(serviceError); 
   } 
 
   static log = (message, data) => { 
      const outputElement = document.getElementById("output"); 
      if (outputElement) { 
         const time = (new Date()).toLocaleTimeString(); 
         const textElement = document.createElement("p"); 
         textElement.innerHTML = (outputElement.childElementCount + 1) + " [" + time + "]: " + message; 
         outputElement.insertBefore(textElement, outputElement.firstChild); 
      } 
 
      if (!data) 
         console.log(message); 
      else 
         console.log(message, data); 
   } 
 
   static initFactory = () => { 
      // To communicate with the DocumentsService, it must be running! 
      // Change these parameters to match the path to the service. 
      lt.Document.DocumentFactory.serviceHost = "http://localhost:40000"; 
      lt.Document.DocumentFactory.servicePath = ""; 
      lt.Document.DocumentFactory.serviceApiPath = "api"; 
   } 
} 
<!doctype html> 
<html lang="en"> 
<title>Document Example | Rotate</title> 
 
<head> 
   <script src="https://code.jquery.com/jquery-2.2.4.min.js" 
      integrity="sha256-BbhdlvQf/xTY9gja0Dq3HiwQF8LaCRTXxZKRutelT44=" crossorigin="anonymous"></script> 
 
   <script src="../../LT/Leadtools.js"></script> 
   <script src="../../LT/Leadtools.Controls.js"></script> 
   <script src="../../LT/Leadtools.Annotations.Engine.js"></script> 
   <script src="../../LT/Leadtools.Annotations.Designers.js"></script> 
   <script src="../../LT/Leadtools.Annotations.Rendering.Javascript.js"></script> 
   <script src="../../LT/Leadtools.Annotations.Automation.js"></script> 
   <script src="../../LT/Leadtools.ImageProcessing.Main.js"></script> 
   <script src="../../LT/Leadtools.ImageProcessing.Color.js"></script> 
   <script src="../../LT/Leadtools.ImageProcessing.Core.js"></script> 
   <script src="../../LT/Leadtools.ImageProcessing.Effects.js"></script> 
   <script src="../../LT/Leadtools.Document.js"></script> 
   <script src="../../LT/Leadtools.Document.Viewer.js"></script> 
   <link rel="stylesheet" type="text/css" href="../../css/examples.css"> 
 
   <!-- All demo files are bundled and appended to the window --> 
   <script src="../../bundle.js" type="text/javascript"></script> 
</head> 
 
<body> 
   <div> 
      <button type="button" id="exampleButton">Run Example</button> 
   </div> 
   <div id="output"></div> 
   <div> 
      <img id="img" /> 
   </div> 
</body> 
 
<script> 
   window.onload = () => { 
      const example = new window.examples.LEADDocument.Rotate(); 
      example.run("exampleButton"); 
   }; 
</script> 
</html> 

Requirements

Target Platforms

Help Version 20.0.2019.10.14
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