The maximum width or height of the HTML5 Canvas Element when it is created automatically.
Object.defineProperty(CanvasOptions.prototype, 'maximumSize',
get: function(),
set: function(value)
)
static maximumSize: number;
The maximum width or height of the canvas
when the element is created automatically. A value of 0 means no maximum and to try all possible values. Default
value is 0.
Used when creating a canvas
. Refer to AutoCreateCanvas for more information.
import { ImageViewer_Example } from "../ImageViewer";
export class ImageViewerItem_AutoCreateCanvasExample {
private viewerExample;
constructor() {
this.viewerExample = new ImageViewer_Example(this.run);
}
private run = (viewer: lt.Controls.ImageViewer) => {
// Setup: clear the old item
viewer.items.clear();
// Create the image to pass in
const img = document.createElement("img");
img.onload = () => {
// Loaded
const item: lt.Controls.ImageViewerItem = new lt.Controls.ImageViewerItem();
// Now either add the item to the viewer first, or set item.autoCreateCanvas to true
item.autoCreateCanvas = true;
item.image = img;
viewer.items.add(item);
// Now, it is a canvas
const canvas = item.canvas as HTMLCanvasElement;
const output = document.getElementById("output");
output.innerHTML = "Is Canvas: " + (!!canvas && canvas instanceof HTMLCanvasElement);
// Draw to it
const context: CanvasRenderingContext2D = canvas.getContext("2d");
context.fillStyle = "rgba(255, 0, 0, .8)";
context.fillRect(25, 25, 325, 325);
// Invalidate so we see the change (or just pan or zoom to see)
viewer.invalidateItem(item);
};
img.src = "https://demo.leadtools.com/images/png/pngimage.png";
}
}
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 ImageViewerItem_AutoCreateCanvasExample {
viewerExample;
constructor() {
this.viewerExample = new ImageViewer_Example(this.run);
}
run = (viewer) => {
// Setup: clear the old item
viewer.items.clear();
// Create the image to pass in
const img = document.createElement("img");
img.onload = () => {
// Loaded
const item = new lt.Controls.ImageViewerItem();
// Now either add the item to the viewer first, or set item.autoCreateCanvas to true
item.autoCreateCanvas = true;
item.image = img;
viewer.items.add(item);
// Now, it is a canvas
const canvas = item.canvas;
const output = document.getElementById("output");
output.innerHTML = "Is Canvas: " + (!!canvas && canvas instanceof HTMLCanvasElement);
// Draw to it
const context = canvas.getContext("2d");
context.fillStyle = "rgba(255, 0, 0, .8)";
context.fillRect(25, 25, 325, 325);
// Invalidate so we see the change (or just pan or zoom to see)
viewer.invalidateItem(item);
};
img.src = "https://demo.leadtools.com/images/png/pngimage.png";
}
}
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 | AutoCreateCanvas</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.ImageViewerItem.AutoCreateCanvas();
};
</script>
</html>
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