Resolution of the item, in dots per inch (DPI).
Object.defineProperty(ImageViewerItem.prototype, 'resolution',
get: function(),
set: function(value)
)
resolution: LeadSizeD;
The resolution (in dots per inch) of the original image data if accounting for the logical size of the image when display is desired. The default value is 0,0.
This value is important when UseDpi is used. A value of 0 means use the current screen resolution. This is the same value set in ScreenDpi.
For more information, refer to Image Viewer Items.
This example adds three canvas elements to the viewer, all with different resolutions.
import { ImageViewer_Example } from "../ImageViewer";
export class ImageViewerItem_ResolutionExample {
private viewerExample;
constructor() {
this.viewerExample = new ImageViewer_Example(this.run);
}
private run = (viewer: lt.Controls.ImageViewer) => {
// Set up margin and padding and layout
viewer.viewLayout = new lt.Controls.ImageViewerVerticalViewLayout();
viewer.itemBorderThickness = 5;
viewer.itemPadding = lt.Controls.ControlPadding.createAll(20);
viewer.itemMargin = lt.Controls.ControlPadding.createAll(10);
viewer.items.clear();
// Create a canvas for each item and draw the same image to it
const createCanvas = () => {
const canvas = document.createElement("canvas") as HTMLCanvasElement;
canvas.width = 200;
canvas.height = 200;
const ctx: CanvasRenderingContext2D = canvas.getContext("2d");
// Red background
ctx.fillStyle = "red";
ctx.fillRect(0, 0, 200, 200);
// White circle
ctx.fillStyle = "white";
ctx.beginPath();
ctx.arc(100, 100, 50, 0, Math.PI * 2);
ctx.closePath();
ctx.fill();
return canvas;
}
// Must use DPI to see the effects
viewer.useDpi = true;
// 96 (Default), 300, 600
const resolutions: lt.LeadSizeD[] = [lt.LeadSizeD.create(96, 96), lt.LeadSizeD.create(300, 300), lt.LeadSizeD.create(600, 600)];
viewer.beginTransform();
for (let i = 0; i < resolutions.length; i++) {
const item: lt.Controls.ImageViewerItem = new lt.Controls.ImageViewerItem();
item.text = "Item " + i;
item.canvas = createCanvas();
item.resolution = resolutions[i];
viewer.items.add(item);
}
viewer.endTransform();
}
}
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_ImageSizeExample {
viewerExample;
constructor() {
this.viewerExample = new ImageViewer_Example(this.run);
}
run = (viewer) => {
// Set up margin and padding and layout
viewer.viewLayout = new lt.Controls.ImageViewerVerticalViewLayout();
viewer.itemBorderThickness = 5;
viewer.itemPadding = lt.Controls.ControlPadding.createAll(20);
viewer.itemMargin = lt.Controls.ControlPadding.createAll(10);
viewer.items.clear();
// Create a canvas for each item and draw the same image to it
const createCanvas = () => {
const canvas = document.createElement("canvas");
canvas.width = 200;
canvas.height = 200;
const ctx = canvas.getContext("2d");
// Red background
ctx.fillStyle = "red";
ctx.fillRect(0, 0, 200, 200);
// White circle
ctx.fillStyle = "white";
ctx.beginPath();
ctx.arc(100, 100, 50, 0, Math.PI * 2);
ctx.closePath();
ctx.fill();
return canvas;
}
// Must use DPI to see the effects
viewer.useDpi = true;
// 96 (Default), 300, 600
const resolutions = [lt.LeadSizeD.create(96, 96), lt.LeadSizeD.create(300, 300), lt.LeadSizeD.create(600, 600)];
viewer.beginTransform();
for (let i = 0; i < resolutions.length; i++) {
const item = new lt.Controls.ImageViewerItem();
item.text = "Item " + i;
item.canvas = createCanvas();
item.resolution = resolutions[i];
viewer.items.add(item);
}
viewer.endTransform();
}
}
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 | Resolution</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.Resolution();
};
</script>
</html>
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