Working with Automated Annotations

Summary

Take the following steps to create an application that implements LEADTOOLS HTML5 automated annotations:

Start with the html file you created in Displaying an Image.

Add the following additional LEADTOOLS Annotation JavaScript libraries by adding the below script tags in the head section of your HTML after the previous LEADTOOLS libraries:

JavaScript Example

<script type="text/javascript" src="lib/Leadtools.Annotations.Core.js"></script> 
<script type="text/javascript" src="lib/Leadtools.Annotations.Rendering.JavaScript.js"></script> 
<script type="text/javascript" src="lib/Leadtools.Annotations.Designers.js"></script> 
<script type="text/javascript" src="lib/Leadtools.Annotations.Automation.js"></script> 
<script type="text/javascript" src="lib/Leadtools.Annotations.JavaScript.js"></script>

The annotation framework allows the user to define the images which are used for various annotations (stamps, point, lock, and hotspot). A default set of images for these objects is included with the toolkit. For this tutorial, we will use these default images. In order to make these objects available to your application, copy the "<LEADTOOLS_INSTALLDIR>\Examples\JS\AnnotationsDemo\Resources" directory to the same directory as your HTML file.

Add two select elements to your page by inserting the below code in the body section of your HTML before the image viewer DIV. These elements will be used to select the current user-mode, and the various types of annotation objects.

JavaScript Example

<label for="currentObject">Annotation Object:</label> 
<select id="currentObject"></select> 
<label for="userMode">User mode:</label> 
<select id="userMode"> 
   <option>Design</option> 
   <option>Run</option> 
</select>

Update app.js with the following code. This code will set up the automation manager and automation object for the application.

JavaScript Example

window.onload = function () { 
   // Get the container DIV 
   var imageViewerDiv = document.getElementById("imageViewerDiv"); 
   // Create the image viewer inside it 
   var createOptions = new lt.Controls.ImageViewerCreateOptions(imageViewerDiv); 
   var imageViewer = new lt.Controls.ImageViewer(createOptions); 
   // Add handler to show an alert on errors 
   imageViewer.itemError.add(function (sender, e) { 
      alert("Error loading " + e.data.srcElement.src); 
   }); 
   imageViewer.imageUrl = "http://demo.leadtools.com/HTML5/images/pngimage.png"; 
                 
   // Create and set up the automation manager using the HTML5 rendering engine 
   var renderingEngine = new lt.Annotations.Rendering.AnnHtml5RenderingEngine(); 
   var manager = new lt.Annotations.Automation.AnnAutomationManager.create(renderingEngine); 
                 
   // Create the default annotations objects  
   manager.createDefaultObjects(); 
                 
   var currentObject = document.getElementById("currentObject"); 
                 
   var automationObjCount = manager.objects.count; 
   for (var i = 0; i < automationObjCount; i++) { 
      // Get the object  
      var automationObj = manager.objects.item(i); 
                 
      // Add its name to the select element  
      var name = automationObj.name; 
      var id = automationObj.id; 
      currentObject.options[currentObject.options.length] = new Option(name, id); 
   } 
                 
   // Hook to its change event 
   currentObject.addEventListener("change", function () { 
      // Get the object ID 
      var id = parseInt(currentObject.options[currentObject.selectedIndex].value); 
                 
      // Set it as the current object in the manager  
      manager.currentObjectId = id; 
   }); 
                 
   // When the current object ID changes, we need to update our select 
   manager.currentObjectIdChanged.add(function (sender, e) { 
      var currentObjectId = manager.currentObjectId; 
      for (var i = 0; i < currentObject.options.length; i++) { 
         var id = parseInt(currentObject.options[i].value); 
         if (id === currentObjectId) { 
            currentObject.selectedIndex = i; 
            break; 
         } 
      } 
   }); 
                 
   var userMode = document.getElementById("userMode"); 
   // Hook to its change event  
   userMode.addEventListener("change", function () { 
      // Get the selected mode  
      var mode = userMode.options[userMode.selectedIndex].innerHTML; 
      if (mode == "Design") { 
         manager.userMode = lt.Annotations.Core.AnnUserMode.design; 
      } else { 
         manager.userMode = lt.Annotations.Core.AnnUserMode.run; 
      } 
   }); 
                 
   // Create an instance of the Automation control object that works with LEADTOOLS ImageViewer 
   var automationControl = new lt.Annotations.JavaScript.ImageViewerAutomationControl(); 
   // Attach our image viewer 
   automationControl.imageViewer = imageViewer; 
                 
   // Set the image viewer interactive mode  
   var automationInteractiveMode = new lt.Annotations.JavaScript.AutomationInteractiveMode(); 
   automationInteractiveMode.automationControl = automationControl; 
   imageViewer.defaultInteractiveMode = automationInteractiveMode; 
                 
   // set up the automation (will create the container as well) 
   var automation = new lt.Annotations.Automation.AnnAutomation(manager, automationControl); 
   // Add handler to update the container size when the image size changes 
   imageViewer.itemChanged.add(function (sender, e) { 
      var container = automation.container; 
      container.size = container.mapper.sizeToContainerCoordinates(imageViewer.imageSize); 
   }); 
                 
   // set up this automation as the active one 
   automation.active = true; 
                 
   // Hook to the run even so we know when an object enters run mode  
   automation.run.add(function (sender, e) { 
      // e is of type AnnRunDesignerEventArgs  
      if (e.operationStatus == lt.Annotations.Core.AnnDesignerOperationStatus.start) { 
         // Get the object being run  
         alert("In run mode, you clicked an object of id " + e.object.id); 
      } 
   }); 
                 
   // Optional: Add the resources to the container 
   addResources(automation.container); 
} 
                  
function addResources(container) { 
   // Add images for the stamp, point, hot spot, and lock annotations 
   var resources = new lt.Annotations.Core.AnnResources(); 
   container.resources = resources; 
   var rubberStampsResources = resources.rubberStamps; 
   var imagesResources = resources.images; 
                 
   rubberStampsResources[lt.Annotations.Core.AnnRubberStampType.stampApproved] = new lt.Annotations.Core.AnnPicture("resources/objects/RubberStamps/approved.png"); 
   rubberStampsResources[lt.Annotations.Core.AnnRubberStampType.stampAssigned] = new lt.Annotations.Core.AnnPicture("resources/objects/RubberStamps/Assigned.png"); 
   rubberStampsResources[lt.Annotations.Core.AnnRubberStampType.stampClient] = new lt.Annotations.Core.AnnPicture("resources/objects/RubberStamps/Client.png"); 
   rubberStampsResources[lt.Annotations.Core.AnnRubberStampType.stampChecked] = new lt.Annotations.Core.AnnPicture("resources/objects/RubberStamps/checked.png"); 
   rubberStampsResources[lt.Annotations.Core.AnnRubberStampType.stampCopy] = new lt.Annotations.Core.AnnPicture("resources/objects/RubberStamps/Copy.png"); 
   rubberStampsResources[lt.Annotations.Core.AnnRubberStampType.stampDraft] = new lt.Annotations.Core.AnnPicture("resources/objects/RubberStamps/Draft.png"); 
   rubberStampsResources[lt.Annotations.Core.AnnRubberStampType.stampExtended] = new lt.Annotations.Core.AnnPicture("resources/objects/RubberStamps/Extended.png"); 
   rubberStampsResources[lt.Annotations.Core.AnnRubberStampType.stampFax] = new lt.Annotations.Core.AnnPicture("resources/objects/RubberStamps/Fax.png"); 
   rubberStampsResources[lt.Annotations.Core.AnnRubberStampType.stampFaxed] = new lt.Annotations.Core.AnnPicture("resources/objects/RubberStamps/Faxed.png"); 
   rubberStampsResources[lt.Annotations.Core.AnnRubberStampType.stampImportant] = new lt.Annotations.Core.AnnPicture("resources/objects/RubberStamps/Important.png"); 
   rubberStampsResources[lt.Annotations.Core.AnnRubberStampType.stampInvoice] = new lt.Annotations.Core.AnnPicture("resources/objects/RubberStamps/Invoice.png"); 
   rubberStampsResources[lt.Annotations.Core.AnnRubberStampType.stampNotice] = new lt.Annotations.Core.AnnPicture("resources/objects/RubberStamps/Notice.png"); 
   rubberStampsResources[lt.Annotations.Core.AnnRubberStampType.stampPaid] = new lt.Annotations.Core.AnnPicture("resources/objects/RubberStamps/Paid.png"); 
                 
   rubberStampsResources[lt.Annotations.Core.AnnRubberStampType.stampOfficial] = new lt.Annotations.Core.AnnPicture("resources/objects/RubberStamps/Official.png"); 
   rubberStampsResources[lt.Annotations.Core.AnnRubberStampType.stampOnFile] = new lt.Annotations.Core.AnnPicture("resources/objects/RubberStamps/Onfile.png"); 
   rubberStampsResources[lt.Annotations.Core.AnnRubberStampType.stampPassed] = new lt.Annotations.Core.AnnPicture("resources/objects/RubberStamps/Passed.png"); 
   rubberStampsResources[lt.Annotations.Core.AnnRubberStampType.stampPending] = new lt.Annotations.Core.AnnPicture("resources/objects/RubberStamps/Pending.png"); 
   rubberStampsResources[lt.Annotations.Core.AnnRubberStampType.stampProcessed] = new lt.Annotations.Core.AnnPicture("resources/objects/RubberStamps/Processed.png"); 
   rubberStampsResources[lt.Annotations.Core.AnnRubberStampType.stampReceived] = new lt.Annotations.Core.AnnPicture("resources/objects/RubberStamps/Received.png"); 
   rubberStampsResources[lt.Annotations.Core.AnnRubberStampType.stampRejected] = new lt.Annotations.Core.AnnPicture("resources/objects/RubberStamps/rejected.png"); 
   rubberStampsResources[lt.Annotations.Core.AnnRubberStampType.stampRelease] = new lt.Annotations.Core.AnnPicture("resources/objects/RubberStamps/Release.png"); 
   rubberStampsResources[lt.Annotations.Core.AnnRubberStampType.stampSent] = new lt.Annotations.Core.AnnPicture("resources/objects/RubberStamps/Sent.png"); 
   rubberStampsResources[lt.Annotations.Core.AnnRubberStampType.stampShipped] = new lt.Annotations.Core.AnnPicture("resources/objects/RubberStamps/Shipped.png"); 
   rubberStampsResources[lt.Annotations.Core.AnnRubberStampType.stampTopSecret] = new lt.Annotations.Core.AnnPicture("resources/objects/RubberStamps/topsecret.png"); 
   rubberStampsResources[lt.Annotations.Core.AnnRubberStampType.stampUrgent] = new lt.Annotations.Core.AnnPicture("resources/objects/RubberStamps/urgent.png"); 
   rubberStampsResources[lt.Annotations.Core.AnnRubberStampType.stampVoid] = new lt.Annotations.Core.AnnPicture("resources/objects/RubberStamps/void.png"); 
                 
   imagesResources.add(new lt.Annotations.Core.AnnPicture("resources/objects/Point.png")); 
   imagesResources.add(new lt.Annotations.Core.AnnPicture("resources/objects/lock.png")); 
   imagesResources.add(new lt.Annotations.Core.AnnPicture("resources/objects/hotspot.png")); 
}

Launch the page in a browser that supports HTML5 to test it. While in design mode, you can select various annotation objects and draw them over the image. When an object is clicked in run mode, an alert is shown indicating which object was clicked. Your application can handle how annotations behave in run mode by handling the automation run event.