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@openseadragon-imaging/openseadragon-imaginghelper
Advanced tools
OpenSeadragon plugin which adds helper properties/methods for imaging applications.
OpenSeadragonImagingHelper is a plugin for OpenSeadragon which implements some properties and methods helpful in imaging applications.
Prerequisite note: OpenSeadragonImagingHelper requires OpenSeadragon version 2.0+.
The OpenSeadragonImagingHelper bundle can be obtained the following ways:
npm install @openseadragon-imaging/openseadragon-imaginghelper
The OpenSeadragonImagingHelper bundle can be included using a script tag in HTML or imported as a library module (ES2015, CommonJS, AMD).
An ImagingHelper object can be created and attached to an OpenSeadragon.Viewer two ways:
Both methods return a new ImagingHelper object, and both methods also add the ImagingHelper object reference to the viewer as a property called 'imagingHelper'.
Example using an HTML script tag
<script
type="text/javascript"
src="path_to/openseadragon/openseadragon.js"
></script>
<script
type="text/javascript"
src="path_to/openseadragon-imaging/openseadragon-imaginghelper.js"
></script>
// Example 1 - Use the Viewer.activateImagingHelper() method to create an ImagingHelper
// create an OpenSeadragon viewer
var viewer = window.OpenSeadragon({...});
// add an ImagingHelper to the viewer
var imagingHelper = viewer.activateImagingHelper({...});
// Example 2 - Attach a new ImagingHelper to an existing OpenSeadragon.Viewer
var imagingHelper = new window.OpenSeadragonImaging.ImagingHelper({viewer: existingviewer});
Example importing as a module
npm install openseadragon --save
npm install @openseadragon-imaging/openseadragon-imaginghelper --save
import OpenSeadragon from 'openseadragon';
import OpenSeadragonImagingHelper from '@openseadragon-imaging/openseadragon-imaginghelper';
// Example 1 - Use the Viewer.activateImagingHelper() method to create an ImagingHelper
// create an OpenSeadragon viewer
var viewer = OpenSeadragon({...});
// add an ImagingHelper to the viewer
var imagingHelper = viewer.activateImagingHelper({...});
// Example 2 - Attach a new ImagingHelper to an existing OpenSeadragon.Viewer
var imagingHelper = new OpenSeadragonImagingHelper({viewer: existingviewer});
The ImagingHelper class provides a simplified zoomFactor which is simply the ratio of the displayed image pixel size to the image's native pixel size.
In OpenSeadragon 2.0 and above, conversion is based on the image at index 0 in world.getItemAt, unless another value is set by the worldIndex option.
The ImagingHelper methods use three coordinate systems, named as follows:
Methods are provided to zoom and/or pan using these conventions, as well as to convert individual horizontal/vertical values or point ({x,y}) objects between coordinate systems (Note: methods that return a point object return new OpenSeadragon.Point objects)
The ImagingHelper class extends the OpenSeadragon.EventSource class and raises an event named 'image-view-changed' whenever the viewer's zoom and/or pan position changes.
// Event Example 1 - Use the options 'onImageViewChanged' property to set a handler
var viewer = OpenSeadragon({...});
var imagingHelper = viewer.activateImagingHelper({onImageViewChanged: onImageViewChanged});
function onImageViewChanged(event) {
// event.viewportWidth == width of viewer viewport in logical coordinates relative to image native size
// event.viewportHeight == height of viewer viewport in logical coordinates relative to image native size
// event.viewportOrigin == OpenSeadragon.Point, top-left of the viewer viewport in logical coordinates relative to image
// event.viewportCenter == OpenSeadragon.Point, center of the viewer viewport in logical coordinates relative to image
// event.zoomFactor == current zoom factor
...
}
// Event Example 2 - Add a handler to an existing ImagingHelper
imagingHelper.addHandler('image-view-changed', function (event) {
// event.viewportWidth == width of viewer viewport in logical coordinates relative to image native size
// event.viewportHeight == height of viewer viewport in logical coordinates relative to image native size
// event.viewportOrigin == OpenSeadragon.Point, top-left of the viewer viewport in logical coordinates relative to image
// event.viewportCenter == OpenSeadragon.Point, center of the viewer viewport in logical coordinates relative to image
// event.zoomFactor == current zoom factor
...
});
The demo site is an example using ImagingHelper in a React application. The page displays many OpenSeadragon and OpenSeadragonImagingHelper metrics, as well as the output of many OpenSeadragonImagingHelper methods, all in real-time as the cursor moves and/or the image is zoomed/panned.
The source code can be found here.
The old demo site is still available here. This page adds an example of syncing an SVG overlay for annotation support.
All the sample code is in scripts/viewmodel.js.
2.2.2:
FAQs
OpenSeadragon plugin which adds helper properties/methods for imaging applications.
The npm package @openseadragon-imaging/openseadragon-imaginghelper receives a total of 19 weekly downloads. As such, @openseadragon-imaging/openseadragon-imaginghelper popularity was classified as not popular.
We found that @openseadragon-imaging/openseadragon-imaginghelper demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 2 open source maintainers collaborating on the project.
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