Update the HTML5 Canvas Element of an item.
Item to update
New HTML5 Canvas Element. If this is null, then the item will be empty after this method returns.
The resolution to use of the image in dots/inch (or DPI). A value of 0,0 or Empty means use the default image
resolution which is 96 pixels.
item.canvas = canvas;
item.resolution = resolution;
UpdateElement is a shortcut for updating not only Canvas, but also Element and Image. Passing a valid HTML Image Element to UpdateElement sets the Image property just as UpdateImage does. Similarly, passing a valid HTML5 Canvas Element to UpdateElement sets the Canvas property just as UpdateCanvas does. The item can have a value in only one of Image, Element or Canvas. Setting one value will automatically delete the values of the others.
var canvas = document.getElementById("myCanvas");
var context = canvas.getContext("2d");
context.fillStyle = "rgba(0, 0, 255, .5)";
context.fillRect(25, 25, 125, 125);
this._imageViewer.items.updateCanvas(this._imageViewer.activeItem, canvas, lt.LeadSizeD.create(96, 96));
Medical Web Viewer .NET