Color used to fill the spy glass background.
Object.defineProperty(ImageViewerSpyGlassInteractiveMode.prototype, 'backgroundColor',
get: function(),
set: function(value)
)
backgroundColor: string;
The color used to fill the spy glass background. Default value is null.
Set this value to any color other than null to fill the background of the spy glass.
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>
ImageViewerSpyGlassInteractiveMode Class
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