AnnTextObject Object

Summary

Provides support for creating and managing text annotation objects.

Syntax
TypeScript
JavaScript
function lt.Annotations.Engine.AnnTextObject 
	extends lt.Annotations.Engine.AnnRectangleObject 
	implements IAnnObjectCloneable 
class lt.Annotations.Engine.AnnTextObject() 
	extends AnnRectangleObject 
	implements IAnnObjectCloneable 
Remarks

The text annotation object is a text string within a bounding rectangle. This class supports a stroke and fill, that can be used on the bounding rectangle.

Programmatically, the boundaries and location of the text object can be controlled using the following properties:

The AnnTextObject class inherits a number of properties from the AnnObject class, providing support for font, stroke and fill characteristics. These properties are listed below:

The name of the text object can be controlled using Labels property, inherited from the AnnObject class. Each object can be transformed with the following methods:

The following properties can also be used to programmatically set characteristics of an AnnTextObject:

Example

This example creates a text object and adds it to the automation container.

AnnText.ts
EngineHelper.ts
AnnText.js
EngineHelper.js
AnnText.html
import { EngineHelper } from "../../utilities/EngineHelper"; 
 
export class AnnObjects_Text { 
   constructor() { 
      const helper = new EngineHelper(); 
      helper.run(this.create); 
   } 
 
   create = (automation: lt.Annotations.Automation.AnnAutomation) => { 
      const inch: number = 720.0; 
      // Add a stamp object 
      const stampObj: lt.Annotations.Engine.AnnStampObject = new lt.Annotations.Engine.AnnStampObject(); 
      // Set the points for the hotspot 
      stampObj.points.add(lt.LeadPointD.create(1 * inch, 1 * inch)); 
      stampObj.points.add(lt.LeadPointD.create(2 * inch, 1 * inch)); 
      stampObj.points.add(lt.LeadPointD.create(2 * inch, 2 * inch)); 
      stampObj.points.add(lt.LeadPointD.create(1 * inch, 2 * inch)); 
      // Set the text 
      stampObj.text = "sample text for stamp"; 
      // Add the object to the automation container 
      automation.container.children.add(stampObj); 
      // Select the object 
      automation.selectObject(stampObj); 
   } 
} 
export class EngineHelper { 
   // Automation object 
   protected _automation: lt.Annotations.Automation.AnnAutomation = null; 
   // Image viewer 
   protected _viewer: lt.Controls.ImageViewer = null; 
 
   constructor() { 
      // Set the LEADTOOLS license. Replace this with your actual license file 
      lt.RasterSupport.setLicenseUri("https://demo.leadtools.com/licenses/js/LEADTOOLSEVAL.txt", "EVAL", null); 
   } 
 
   public run(callback?: (automation: lt.Annotations.Automation.AnnAutomation, viewer: lt.Controls.ImageViewer) => void): void { 
      // Create the viewer 
      const imageViewerDiv = document.getElementById("imageViewerDiv"); 
      const createOptions: lt.Controls.ImageViewerCreateOptions = new lt.Controls.ImageViewerCreateOptions(imageViewerDiv); 
      const viewer: lt.Controls.ImageViewer = new lt.Controls.ImageViewer(createOptions); 
      viewer.autoCreateCanvas = true; 
      this._viewer = viewer; 
 
      // PanZoom interactive mode 
      const panZoom: lt.Controls.ImageViewerPanZoomInteractiveMode = new lt.Controls.ImageViewerPanZoomInteractiveMode(); 
 
      // Create an instance of the Automation control object that works with LEADTOOLS ImageViewer 
      const imageViewerAutomationControl: lt.Demos.Annotations.ImageViewerAutomationControl = new lt.Demos.Annotations.ImageViewerAutomationControl(); 
      // Attach our image viewer 
      imageViewerAutomationControl.imageViewer = viewer; 
 
      // Set the image viewer interactive mode 
      const automationInteractiveMode: lt.Demos.Annotations.AutomationInteractiveMode = new lt.Demos.Annotations.AutomationInteractiveMode(); 
      automationInteractiveMode.automationControl = imageViewerAutomationControl; 
 
      // Set the image URL 
      viewer.imageUrl = "http://demo.leadtools.com/images/png/pngimage.png"; 
 
      // Create and set up the automation manager using the HTML5 rendering engine 
      const renderingEngine: lt.Annotations.Rendering.AnnHtml5RenderingEngine = new lt.Annotations.Rendering.AnnHtml5RenderingEngine(); 
      const manager: lt.Annotations.Automation.AnnAutomationManager = lt.Annotations.Automation.AnnAutomationManager.create(renderingEngine); 
 
      // Create default automation objects 
      manager.createDefaultObjects(); 
 
      // Add the objects to the objects select element 
      const currentObjectIdSelect = document.getElementById("currentObjectIdSelect") as HTMLSelectElement; 
      // Add the PanZoom option 
      currentObjectIdSelect.options[currentObjectIdSelect.options.length] = new Option("Pan/Zoom", lt.Annotations.Engine.AnnObject.none.toString()); 
 
      const automationObjCount: number = manager.objects.count; 
      for (let i = 0; i < automationObjCount; i++) { 
         // Get the object 
         const automationObj: lt.Annotations.Automation.AnnAutomationObject = manager.objects.item(i); 
 
         // Add its name to the select element 
         const name: string = automationObj.name; 
         const id: string = automationObj.id.toString(); 
         currentObjectIdSelect.options[currentObjectIdSelect.options.length] = new Option(name, id); 
      } 
 
      // Hook to its change event 
      currentObjectIdSelect.addEventListener("change", () => { 
         // Get the object ID 
         const id: number = parseInt(currentObjectIdSelect.options[currentObjectIdSelect.selectedIndex].value); 
 
         // Set it as the current object in the manager 
         manager.currentObjectId = id; 
 
         // If this is the "Pan/Zoom" option, then back to pan zoom, otherwise, set our automation control 
         if (id == lt.Annotations.Engine.AnnObject.none) { 
            viewer.defaultInteractiveMode = panZoom; 
         } 
         else { 
            viewer.defaultInteractiveMode = automationInteractiveMode; 
         } 
      }); 
 
      // When the current object ID changes, we need to update our select 
      manager.add_currentObjectIdChanged((sender, e) => { 
         const currentObjectId: number = manager.currentObjectId; 
         for (let i = 0; i < currentObjectIdSelect.options.length; i++) { 
            const id: number = parseInt(currentObjectIdSelect.options[i].value); 
            if (id === currentObjectId) { 
               currentObjectIdSelect.selectedIndex = i; 
               break; 
            } 
         } 
      }); 
 
      // Pan zoom by default 
      viewer.defaultInteractiveMode = panZoom; 
 
      // set up the automation (will create the container as well) 
      const automation: lt.Annotations.Automation.AnnAutomation = new lt.Annotations.Automation.AnnAutomation(manager, imageViewerAutomationControl); 
      this._automation = automation; 
 
      // Add handler to update the container size when the image size changes 
      viewer.itemChanged.add((sender, e) => { 
         const container: lt.Annotations.Engine.AnnContainer = automation.container; 
         container.size = container.mapper.sizeToContainerCoordinates(viewer.imageSize); 
 
         //Create new canvas data provider for the new image 
         const canvasDataProvider: lt.Demos.Annotations.CanvasDataProvider = new lt.Demos.Annotations.CanvasDataProvider(viewer.activeItem.canvas); 
         imageViewerAutomationControl.automationDataProvider = canvasDataProvider; 
 
      }); 
 
      // set up this automation as the active one 
      this._automation.active = true; 
 
      const exampleButton = document.getElementById("exampleButton"); 
      exampleButton.onclick = () => { 
         if(callback) 
            callback(this._automation, this._viewer); 
      } 
   } 
} 
import { EngineHelper } from "../../utilities/EngineHelper"; 
 
export class AnnObjects_Text { 
   constructor() { 
      const helper = new EngineHelper(); 
      helper.run(this.create); 
   } 
 
   create = (automation) => { 
      const inch = 720.0; 
      // Add a stamp object 
      const stampObj = new lt.Annotations.Engine.AnnStampObject(); 
      // Set the points for the hotspot 
      stampObj.points.add(lt.LeadPointD.create(1 * inch, 1 * inch)); 
      stampObj.points.add(lt.LeadPointD.create(2 * inch, 1 * inch)); 
      stampObj.points.add(lt.LeadPointD.create(2 * inch, 2 * inch)); 
      stampObj.points.add(lt.LeadPointD.create(1 * inch, 2 * inch)); 
      // Set the text 
      stampObj.text = "sample text for stamp"; 
      // Add the object to the automation container 
      automation.container.children.add(stampObj); 
      // Select the object 
      automation.selectObject(stampObj); 
   } 
} 
export class EngineHelper { 
   // Automation object 
   _automation = null; 
   // Image viewer 
   _viewer = null; 
 
   constructor() { 
      // Set the LEADTOOLS license. Replace this with your actual license file 
      lt.RasterSupport.setLicenseUri("https://demo.leadtools.com/licenses/js/LEADTOOLSEVAL.txt", "EVAL", null); 
   } 
 
   run(callback) { 
      // Create the viewer 
      const imageViewerDiv = document.getElementById("imageViewerDiv"); 
      const createOptions = new lt.Controls.ImageViewerCreateOptions(imageViewerDiv); 
      const viewer = new lt.Controls.ImageViewer(createOptions); 
      viewer.autoCreateCanvas = true; 
      this._viewer = viewer; 
 
      // PanZoom interactive mode 
      const panZoom = new lt.Controls.ImageViewerPanZoomInteractiveMode(); 
 
      // Create an instance of the Automation control object that works with LEADTOOLS ImageViewer 
      const imageViewerAutomationControl = new lt.Demos.Annotations.ImageViewerAutomationControl(); 
      // Attach our image viewer 
      imageViewerAutomationControl.imageViewer = viewer; 
 
      // Set the image viewer interactive mode 
      const automationInteractiveMode = new lt.Demos.Annotations.AutomationInteractiveMode(); 
      automationInteractiveMode.automationControl = imageViewerAutomationControl; 
 
      // Set the image URL 
      viewer.imageUrl = "http://demo.leadtools.com/images/png/pngimage.png"; 
 
      // Create and set up the automation manager using the HTML5 rendering engine 
      const renderingEngine = new lt.Annotations.Rendering.AnnHtml5RenderingEngine(); 
      const manager = lt.Annotations.Automation.AnnAutomationManager.create(renderingEngine); 
 
      // Create default automation objects 
      manager.createDefaultObjects(); 
 
      // Add the objects to the objects select element 
      const currentObjectIdSelect = document.getElementById("currentObjectIdSelect"); 
      // Add the PanZoom option 
      currentObjectIdSelect.options[currentObjectIdSelect.options.length] = new Option("Pan/Zoom", lt.Annotations.Engine.AnnObject.none.toString()); 
 
      const automationObjCount = manager.objects.count; 
      for (let i = 0; i < automationObjCount; i++) { 
         // Get the object 
         const automationObj = manager.objects.item(i); 
 
         // Add its name to the select element 
         const name = automationObj.name; 
         const id = automationObj.id.toString(); 
         currentObjectIdSelect.options[currentObjectIdSelect.options.length] = new Option(name, id); 
      } 
 
      // Hook to its change event 
      currentObjectIdSelect.addEventListener("change", () => { 
         // Get the object ID 
         const id = parseInt(currentObjectIdSelect.options[currentObjectIdSelect.selectedIndex].value); 
 
         // Set it as the current object in the manager 
         manager.currentObjectId = id; 
 
         // If this is the "Pan/Zoom" option, then back to pan zoom, otherwise, set our automation control 
         if (id == lt.Annotations.Engine.AnnObject.none) { 
            viewer.defaultInteractiveMode = panZoom; 
         } 
         else { 
            viewer.defaultInteractiveMode = automationInteractiveMode; 
         } 
      }); 
 
      // When the current object ID changes, we need to update our select 
      manager.add_currentObjectIdChanged((sender, e) => { 
         const currentObjectId = manager.currentObjectId; 
         for (let i = 0; i < currentObjectIdSelect.options.length; i++) { 
            const id = parseInt(currentObjectIdSelect.options[i].value); 
            if (id === currentObjectId) { 
               currentObjectIdSelect.selectedIndex = i; 
               break; 
            } 
         } 
      }); 
 
      // Pan zoom by default 
      viewer.defaultInteractiveMode = panZoom; 
 
      // set up the automation (will create the container as well) 
      const automation = new lt.Annotations.Automation.AnnAutomation(manager, imageViewerAutomationControl); 
      this._automation = automation; 
 
      // Add handler to update the container size when the image size changes 
      viewer.itemChanged.add((sender, e) => { 
         const container = automation.container; 
         container.size = container.mapper.sizeToContainerCoordinates(viewer.imageSize); 
 
         //Create new canvas data provider for the new image 
         const canvasDataProvider = new lt.Demos.Annotations.CanvasDataProvider(viewer.activeItem.canvas); 
         imageViewerAutomationControl.automationDataProvider = canvasDataProvider; 
 
      }); 
 
      // set up this automation as the active one 
      this._automation.active = true; 
 
      const exampleButton = document.getElementById("exampleButton"); 
      exampleButton.onclick = () => { 
         if(callback) 
            callback(this._automation, this._viewer); 
      } 
   } 
} 
<!doctype html> 
<html lang="en"> 
<title>AnnObject Example | AnnText</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.Annotations.BatesStamp.js"></script> 
   <script src="../../LT/Leadtools.Demos.js"></script> 
   <script src="../../LT/Leadtools.Demos.Annotations.js"></script> 
   <style> 
      #imageViewerDiv { 
         border: 1px solid #000000; 
         width: 800px; 
         height: 800px; 
         background-color: #7F7F7F; 
      } 
   </style> 
   <!-- All demo files are bundled and appended to the window --> 
   <script src="../../bundle.js" type="text/javascript"></script> 
</head> 
 
<body> 
   <p>Either Pan/Zoom or Annotations mode. In annotations mode, draw new objects or edit them.</p> 
   <div> 
      <select id="currentObjectIdSelect"></select> 
   </div> 
   <div> 
      <input type="button" id="exampleButton" value="Example" /> 
      <label id="exampleLabel" /> 
   </div> 
   <div id="imageViewerDiv" /> 
</body> 
 
<script> 
   window.onload = () => new window.examples.AnnObjects.AnnText(); 
</script> 
</html> 
Requirements

Target Platforms

Help Version 23.0.2024.3.4
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© 1991-2024 LEAD Technologies, Inc. All Rights Reserved.

Leadtools.Annotations.Engine Assembly

Products | Support | Contact Us | Intellectual Property Notices
© 1991-2023 LEAD Technologies, Inc. All Rights Reserved.