backgroundColor Property

Summary

Color used to fill the spy glass background.

Syntax
TypeScript
JavaScript
Object.defineProperty(ImageViewerSpyGlassInteractiveMode.prototype, 'backgroundColor', 
	get: function(), 
	set: function(value) 
) 
backgroundColor: string; 

Property Value

The color used to fill the spy glass background. Default value is null.

Remarks

Set this value to any color other than null to fill the background of the spy glass.

Example
SpyGlassInteractiveMode.ts
ImageViewer.ts
SpyGlassInteractiveMode.js
ImageViewer.js
SpyGlassInteractiveMode.html
import { ImageViewer_Example } from "../ImageViewer"; 
 
export class SpyGlassInteractiveMode_Example { 
   private viewerExample; 
   constructor() { 
      this.viewerExample = new ImageViewer_Example(this.run); 
   } 
 
   private run = (viewer: lt.Controls.ImageViewer) => { 
      viewer.interactiveModes.clearItems(); 
      viewer.interactiveModes.beginUpdate(); 
 
      // Create the spyglass 
      const spyGlass: lt.Controls.ImageViewerSpyGlassInteractiveMode = new lt.Controls.ImageViewerSpyGlassInteractiveMode(); 
      spyGlass.backgroundColor = "rgba(255, 255, 0, 0.5)"; 
      spyGlass.autoItemMode = lt.Controls.ImageViewerAutoItemMode.autoSet; 
 
      // On draw, draw the viewer flipped 
      spyGlass.drawImage.add((sender, e) => { 
         const rect: lt.LeadRectD = e.destinationRectangle; 
         const ctx: CanvasRenderingContext2D = e.context; 
         // Width and height of the canvas 
         const controlSize: lt.LeadSizeD = viewer.controlSize; 
 
         ctx.save(); 
         // Undo offset of the spyglass 
         ctx.translate(-rect.x, -rect.y); 
 
         // Flip the context 
         ctx.scale(1, -1); 
         ctx.translate(0, -controlSize.height); 
 
         // Draw the view 
         viewer.renderRedirect(ctx, new lt.Controls.ImageViewerRenderRedirectOptions(), lt.LeadRectD.empty); 
 
         ctx.restore(); 
      }); 
 
      viewer.interactiveModes.add(spyGlass); 
      viewer.interactiveModes.endUpdate(); 
   } 
} 
export class ImageViewer_Example { 
   // LEADTOOLS ImageViewer to be used with this example 
   protected imageViewer: lt.Controls.ImageViewer = null; 
   // Generic state value used by the examples 
   public timesClicked: number = 0; 
 
   constructor(callback?: (viewer: lt.Controls.ImageViewer) => 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 = document.getElementById("imageViewerDiv"); 
      const createOptions: lt.Controls.ImageViewerCreateOptions = new lt.Controls.ImageViewerCreateOptions(imageViewerDiv); 
      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.imageViewer); 
      }); 
   } 
} 
import { ImageViewer_Example } from "../ImageViewer"; 
 
export class SpyGlassInteractiveMode_Example { 
   viewerExample; 
   constructor() { 
      this.viewerExample = new ImageViewer_Example(this.run); 
   } 
 
   run = (viewer) => { 
      viewer.interactiveModes.clearItems(); 
      viewer.interactiveModes.beginUpdate(); 
 
      // Create the spyglass 
      const spyGlass = new lt.Controls.ImageViewerSpyGlassInteractiveMode(); 
      spyGlass.backgroundColor = "rgba(255, 255, 0, 0.5)"; 
      spyGlass.autoItemMode = lt.Controls.ImageViewerAutoItemMode.autoSet; 
 
      // On draw, draw the viewer flipped 
      spyGlass.drawImage.add((sender, e) => { 
         const rect = e.destinationRectangle; 
         const ctx = e.context; 
         // Width and height of the canvas 
         const controlSize = viewer.controlSize; 
 
         ctx.save(); 
         // Undo offset of the spyglass 
         ctx.translate(-rect.x, -rect.y); 
 
         // Flip the context 
         ctx.scale(1, -1); 
         ctx.translate(0, -controlSize.height); 
 
         // Draw the view 
         viewer.renderRedirect(ctx, new lt.Controls.ImageViewerRenderRedirectOptions(), lt.LeadRectD.empty); 
 
         ctx.restore(); 
      }); 
 
      viewer.interactiveModes.add(spyGlass); 
      viewer.interactiveModes.endUpdate(); 
   } 
} 
export class ImageViewer_Example { 
   // LEADTOOLS ImageViewer to be used with this example 
   imageViewer = null; 
   // Generic state value used by the examples 
   timesClicked = 0; 
 
   constructor(callback) { 
      // 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.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.imageViewer); 
      }); 
   } 
} 
<!doctype html> 
<html lang="en"> 
<title>Controls Example | SpyGlassInteractiveMode</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> 
   <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> 
   <p>Press and drag on the image to pan.</p> 
   <p>Hold down the control key and press and drag on the image or pinch with two fingers to zoom in and out.</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.Spyglass.SpyGlassInteractiveMode(); 
 
   }; 
</script> 
</html> 
Requirements

Target Platforms

Help Version 23.0.2024.2.29
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© 1991-2024 LEAD Technologies, Inc. All Rights Reserved.

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