Skip to content
master
Switch branches/tags
Go to file
Code

Latest commit

 

Git stats

Files

Permalink
Failed to load latest commit information.
Type
Name
Latest commit message
Commit time
 
 
 
 
src
 
 
 
 
 
 
 
 
 
 

OpenSeadragonCanvasOverlayHd

An OpenSeadragon plugin that adds canvas overlay capability and supports multi-images.

Compatible with OpenSeadragon 2.2.0 or greater.

Documentation

To add a canvas overlay to your OpenSeadragon Viewer, create a new OpenSeadragon.CanvasOverlayHd instance, passing the OpenSeadragon viewer and configuration options. Configuration options are: onRedraw - callback function that does the actual drawing clearBeforeRedraw (default as true): clear canvas before redrawing.

For example:

const tileSource = {
    Image: {
      xmlns: 'http://schemas.microsoft.com/deepzoom/2008',
      Url: 'http://openseadragon.github.io/example-images/highsmith/highsmith_files/',
      Format: 'jpg',
      Overlap: '2',
      TileSize: '256',
      Size: {
        Height: '9221',
        Width: '7026',
      }
    }
  };

const viewer = new OpenSeadragon({
	collectionMode: true,
	collectionRows: 2,
	tileSources: [
	{ tileSource: tileSource },
	{ tileSource: tileSource },
	{ tileSource: tileSource },
	{ tileSource: tileSource }]
});

const colors = ['#a6cee3', '#1f78b4', '#b2df8a', '#33a02c'];
const overlay = new OpenSeadragon.CanvasOverlayHd(viewer, {
	onRedraw: function (opts) {
		const context = opts.context;
		context.fillStyle = colors[opts.index];
		context.beginPath();
		context.arc(150, 150, 150, 0, Math.PI * 2, true);
		context.fill();
	}
});

Demo

About

An OpenSeadragon plugin that adds canvas overlay capability in HD and supports multi-images.

Topics

Resources

License

Releases

No releases published

Packages

No packages published