inputCanvas Property

Summary

Gets or sets the input canvas that will contain the area of the displayed image.

Syntax
TypeScript
JavaScript
Object.defineProperty(SpyGlassPositionChangedEventArgs.prototype, 'inputCanvas', 
	get: function() 
) 
inputCanvas: HTMLCanvasElement; // read-only 

Property Value

CanvasElement which represents the input canvas that will contain the area of the displayed image.

Remarks

If you want to do any image processing on the spy glass, you should use this canvas as an input canvas, modify it and then pass it to the output canvas Canvas.

Example
SpyGlass.js
MedicalViewer_2D_Color_Example.js
SpyGlass.ts
MedicalViewer_2D_Color_Example.ts
SpyGlass.html
import { MedicalViewer_2D_Color_Example } from "../MedicalViewer_2D_Color_Example"; 
 
 
export class SpyGlass_Example { 
    constructor() { 
        this.run = (medicalViewer) => { 
            this.medicalViewer = medicalViewer; 
            var cell = this.medicalViewer.layout.cells.get_item(0); 
            var spyGlass = new lt.Controls.Medical.SpyGlassAction(); 
            spyGlass.resizeGlassOnScroll = true; 
            cell.setCommand(0, spyGlass); 
            cell.runCommand(0); 
            spyGlass.imageRequested.add((sender, e) => { 
                e.canvas = e.inputCanvas; 
            }); 
        }; 
        this.viewerExample = new MedicalViewer_2D_Color_Example(this.run); 
    } 
} 
export class MedicalViewer_2D_Color_Example { 
    constructor(callback) { 
        // LEADTOOLS ImageViewer to be used with this example 
        this.medicalViewer = null; 
        // Generic state value used by the examples 
        this.timesClicked = 0; 
        // Set the LEADTOOLS license. Replace this with your actual license file 
        lt.RasterSupport.setLicenseUri("https://demo.leadtools.com/licenses/js/LEADTOOLSEVAL.txt", "EVAL", null); 
        // Create an image viewer inside the imageViewerDiv element 
        const imageViewerDiv = document.getElementById("imageViewerDiv"); 
        const createOptions = new lt.Controls.ImageViewerCreateOptions(imageViewerDiv); 
        this.medicalViewer = new lt.Controls.Medical.MedicalViewer(imageViewerDiv, 1, 1); 
        this.medicalViewer.onSizeChanged(); 
        var cell = new lt.Controls.Medical.Cell(this.medicalViewer, this.medicalViewer.get_divId(), 1, 1); 
        // Set the show border to "true", to show a border around the cell.  
        cell.set_showFrameBorder(true); 
        // Add the cell to the viewer.   
        this.medicalViewer.layout.get_items().add(cell); 
        // [optional] Select the cell (it can also be selected by clicking on it.)  
        cell.set_selected(true); 
        // Now create a frame object which will hold the image inside the cell.  
        var cellFrame = new lt.Controls.Medical.Frame(cell); 
        // Add the frame to the cell class.  
        cell.get_frames().add(cellFrame); 
        // we are now going to to download an image from leadtools medical viewer demo web site, you need to change this to download images from your database.  
        var xhttp = new XMLHttpRequest(); 
        xhttp.onreadystatechange = function (data) { 
            if (this.readyState == 4 && this.status == 200) { 
                // here we got the authentication Code that we need to retrieve the images from leadtools database.  
                var authenticationCode = encodeURIComponent(this.responseText); 
                // now, this is the MRTI info that contains the image information, width, height, tiles....etc.  
                var mrtiInfo = new lt.Controls.Medical.MRTIImage(); 
                // The image dpi.  
                mrtiInfo.fullDpi = lt.LeadSizeD.create(150, 150); 
                // the tile size, recommended value is 256  
                mrtiInfo.tileSize = lt.LeadSizeD.create(1944, 1944); 
                mrtiInfo.frameIndex = 0; 
                // does this image support window level.  
                mrtiInfo.supportWindowLevel = true; 
                // different resolution for the image.  
                var resolutions = [{ "width": 1944, "height": 1944 }, { "width": 972, "height": 972 }, { "width": 486, "height": 486 }, { "width": 243, "height": 243 }, { "width": 121, "height": 121 }]; 
                mrtiInfo.resolutions = []; 
                for (var i = 0; i < resolutions.length; i++) { 
                    mrtiInfo.resolutions[i] = lt.LeadSizeD.create(resolutions[i].width, resolutions[i].height); 
                } 
                // the image width and height.  
                cellFrame.set_width(mrtiInfo.resolutions[0].width); 
                cellFrame.set_height(mrtiInfo.resolutions[0].height); 
                // the image full size.  
                mrtiInfo.fullSize = lt.LeadSizeD.create(cellFrame.get_width(), cellFrame.get_height()); 
                // now we need the image URL,  
                var imageUri = "https://medicaldemos.leadtools.com/MedicalViewerServiceAsp22/api/retrieve"; 
                imageUri += "/GetImageTile?auth="; 
                imageUri += authenticationCode; 
                // this the image instance UID, change this if you want to retrieve anything else.  
                imageUri += "&instance=1.2.840.114434.12387576.10100457.4075310.6503931"; 
                mrtiInfo.imageUri = imageUri; 
                mrtiInfo.supportWindowLevel = false; 
                // set this info to the cell frame.  
                cellFrame.mrtiInfo = mrtiInfo; 
                // now we need to set the information for the image so we can do window level.  
                var imageInfo = new lt.Controls.Medical.DICOMImageInformation(); 
                // set the image width and height.  
                imageInfo.width = 1944; 
                imageInfo.height = 1944; 
                // bits per pixel for the image  
                imageInfo.bitsPerPixel = 24; 
                // set these information to the frame.  
                cellFrame.set_information(imageInfo); 
            } 
        }; 
        // We are trying here to get an image from the Leadtools database, we need to login and get the authentication code.  
        xhttp.open("POST", "https://medicaldemos.leadtools.com/MedicalViewerServiceAsp22/api/auth/AuthenticateUser", true); 
        xhttp.setRequestHeader('Content-Type', 'application/json; charset=UTF-8'); 
        // we log in as a 'guest', after calling the below line, we will receive the authentication code sent via 'onreadystatechange' above.  
        xhttp.send(JSON.stringify({ userName: 'guest', password: 'guest', userData: '' })); 
        // this.imageViewer = new lt.Controls.ImageViewer(createOptions); 
        // this.imageViewer.viewVerticalAlignment = lt.Controls.ControlAlignment.center; 
        // this.imageViewer.viewHorizontalAlignment = lt.Controls.ControlAlignment.center; 
        // this.imageViewer.autoCreateCanvas = true; 
        // // Add Pan/Zoom interactive mode 
        // // Click and drag to pan, CTRL-Click and drag to zoom in and out 
        // this.imageViewer.interactiveModes.add(new lt.Controls.ImageViewerPanZoomInteractiveMode()); 
        // // Load an image 
        // this.imageViewer.imageUrl = "https://demo.leadtools.com/images/jpeg/cannon.jpg"; 
        // this.imageViewer.zoom(lt.Controls.ControlSizeMode.fit, .9, this.imageViewer.defaultZoomOrigin); 
        const exampleButton = document.getElementById("exampleButton"); 
        exampleButton.addEventListener("click", () => { 
            this.timesClicked++; 
            // Run the example 
            if (callback) 
                callback(this.medicalViewer); 
        }); 
    } 
} 
import { MedicalViewer_2D_Color_Example } from "../MedicalViewer_2D_Color_Example"; 
 
 
export class SpyGlass_Example { 
   private viewerExample; 
   private medicalViewer; 
   constructor() { 
      this.viewerExample = new MedicalViewer_2D_Color_Example(this.run); 
   } 
 
   private run = (medicalViewer: lt.Controls.Medical.MedicalViewer) => { 
      this.medicalViewer = medicalViewer; 
 
      var cell: lt.Controls.Medical.Cell = this.medicalViewer.layout.cells.get_item(0); 
 
      var spyGlass: lt.Controls.Medical.SpyGlassAction = new lt.Controls.Medical.SpyGlassAction(0); 
 
 
      spyGlass.resizeGlassOnScroll = true; 
 
      cell.setCommand(0, spyGlass); 
      cell.runCommand(0); 
 
      spyGlass.imageRequested.add((sender: any, e: lt.Controls.Medical.SpyGlassEventArgs) => { 
 
         e.outputCanvas = e.inputCanvas; 
 
      }); 
 
 
 
   } 
} 
export class MedicalViewer_2D_Color_Example { 
   // LEADTOOLS ImageViewer to be used with this example 
   protected medicalViewer: lt.Controls.Medical.MedicalViewer = null; 
   // Generic state value used by the examples 
   public timesClicked: number = 0; 
 
   constructor(callback?: (medicalViewer: lt.Controls.Medical.MedicalViewer) => void) { 
      // Set the LEADTOOLS license. Replace this with your actual license file 
      lt.RasterSupport.setLicenseUri("https://demo.leadtools.com/licenses/js/LEADTOOLSEVAL.txt", "EVAL", null); 
 
      // Create an image viewer inside the imageViewerDiv element 
      const imageViewerDiv: HTMLDivElement = <HTMLDivElement>document.getElementById("imageViewerDiv"); 
      const createOptions: lt.Controls.ImageViewerCreateOptions = new lt.Controls.ImageViewerCreateOptions(imageViewerDiv); 
 
 
 
      this.medicalViewer = new lt.Controls.Medical.MedicalViewer(imageViewerDiv, 1, 1); 
      this.medicalViewer.onSizeChanged(); 
 
      var cell = new lt.Controls.Medical.Cell(this.medicalViewer, this.medicalViewer.get_divId(), 1, 1); 
 
      // Set the show border to "true", to show a border around the cell.  
      cell.set_showFrameBorder(true); 
 
      // Add the cell to the viewer.   
      this.medicalViewer.layout.get_items().add(cell); 
 
      // [optional] Select the cell (it can also be selected by clicking on it.)  
      cell.set_selected(true); 
 
      // Now create a frame object which will hold the image inside the cell.  
      var cellFrame = new lt.Controls.Medical.Frame(cell); 
 
      // Add the frame to the cell class.  
      cell.get_frames().add(cellFrame); 
 
      // we are now going to download an image from LEADTOOLS Medical Viewer demo web site, you need to change this to download images from your database.  
      var xhttp = new XMLHttpRequest(); 
      xhttp.onreadystatechange = function (data) { 
         if (this.readyState == 4 && this.status == 200) { 
            // here we got the authentication Code that we need to retrieve the images from the LEADTOOLS database.  
            var authenticationCode = encodeURIComponent(this.responseText); 
 
 
            // now, this is the MRTI info that contains the image information, width, height, tiles....etc.  
            var mrtiInfo = new lt.Controls.Medical.MRTIImage(); 
 
            // The image dpi.  
            mrtiInfo.fullDpi = lt.LeadSizeD.create(150, 150); 
 
            // the tile size, recommended value is 256  
            mrtiInfo.tileSize = lt.LeadSizeD.create(1944, 1944); 
            mrtiInfo.frameIndex = 0; 
 
            // does this image support window level?  
            mrtiInfo.supportWindowLevel = true; 
 
            // different resolution for the image.  
            var resolutions = [{ "width": 1944, "height": 1944 }, { "width": 972, "height": 972 }, { "width": 486, "height": 486 }, { "width": 243, "height": 243 }, { "width": 121, "height": 121 }]; 
 
            mrtiInfo.resolutions = []; 
            for (var i = 0; i < resolutions.length; i++) { 
               mrtiInfo.resolutions[i] = lt.LeadSizeD.create(resolutions[i].width, resolutions[i].height); 
            } 
 
            // the image width and height.  
            cellFrame.set_width(mrtiInfo.resolutions[0].width); 
            cellFrame.set_height(mrtiInfo.resolutions[0].height); 
 
            // the image full size.  
            mrtiInfo.fullSize = lt.LeadSizeD.create(cellFrame.get_width(), cellFrame.get_height()); 
 
            // now we need the image URL,  
            var imageUri = "https://medicaldemos.leadtools.com/MedicalViewerServiceAsp22/api/retrieve"; 
            imageUri += "/GetImageTile?auth="; 
            imageUri += authenticationCode; 
            // this is the image instance UID, change this if you want to retrieve anything else.  
            imageUri += "&instance=1.2.840.114434.12387576.10100457.4075310.6503931"; 
            mrtiInfo.imageUri = imageUri; 
            mrtiInfo.supportWindowLevel = false; 
 
            // set this info to the cell frame.  
            cellFrame.mrtiInfo = mrtiInfo; 
 
 
            // now we need to set the information for the image so we can do window level.  
            var imageInfo = new lt.Controls.Medical.DICOMImageInformation(); 
 
            // set the image width and height.  
            imageInfo.width = 1944; 
            imageInfo.height = 1944; 
 
            // bits per pixel for the image  
            imageInfo.bitsPerPixel = 24; 
 
            // set these information to the frame.  
 
            cellFrame.set_information(imageInfo); 
         } 
      }; 
 
      // We are trying to get an image from the LEADTOOLS database. We need to login and get the authentication code.  
      xhttp.open("POST", "https://medicaldemos.leadtools.com/MedicalViewerServiceAsp22/api/auth/AuthenticateUser", true); 
      xhttp.setRequestHeader('Content-Type', 'application/json; charset=UTF-8'); 
      // we log in as a 'guest', after calling the below line, we will receive the authentication code sent via 'onreadystatechange' above.  
      xhttp.send(JSON.stringify({ userName: 'guest', password: 'guest', userData: '' })); 
 
      // this.imageViewer = new lt.Controls.ImageViewer(createOptions); 
      // this.imageViewer.viewVerticalAlignment = lt.Controls.ControlAlignment.center; 
      // this.imageViewer.viewHorizontalAlignment = lt.Controls.ControlAlignment.center; 
      // this.imageViewer.autoCreateCanvas = true; 
 
      // // Add Pan/Zoom interactive mode 
      // // Click and drag to pan, CTRL-Click and drag to zoom in and out 
      // this.imageViewer.interactiveModes.add(new lt.Controls.ImageViewerPanZoomInteractiveMode()); 
 
      // // Load an image 
      // this.imageViewer.imageUrl = "https://demo.leadtools.com/images/jpeg/cannon.jpg"; 
 
      // this.imageViewer.zoom(lt.Controls.ControlSizeMode.fit, .9, this.imageViewer.defaultZoomOrigin); 
 
      const exampleButton = document.getElementById("exampleButton"); 
      exampleButton.addEventListener("click", () => { 
         this.timesClicked++; 
         // Run the example 
         if (callback) 
            callback(this.medicalViewer); 
      }); 
   } 
} 
<!doctype html> 
<html lang="en"> 
   <title>SpyGlass Example</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> 
   <script src="../../LT/Leadtools.Controls.Medical.js"></script> 
   <style> 
      body { 
         font-family: 'Segoe UI', sans-serif; 
      } 
 
      #imageViewerDiv { 
         border: 1px solid #888; 
         width: 500px; 
         height: 500px; 
         background-color: #eee; 
      } 
   </style> 
 
   <!-- All demo files are bundled and appended to the window --> 
   <script src="../../bundle.js" type="text/javascript"></script> 
</head> 
 
<body  oncontextmenu="return false;"> 
   <p>Hold down the mouse button to show the spyglass control, zoom in/out by scrolling while holding down the mouse button.</p> 
   <div> 
      <button type="button" id="exampleButton">Run Example</button> 
   </div> 
   <div id="imageViewerDiv"></div> 
   <div id="output"></div> 
</body> 
 
<script> 
   window.onload = () => { 
       const example = new window.examples.MedicalViewer.SpyGlass(); 
 
   }; 
</script> 
</html> 
Requirements

Target Platforms

Help Version 22.0.2023.2.14
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© 1991-2023 LEAD Technologies, Inc. All Rights Reserved.

Leadtools.Controls.Medical Assembly

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