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The DWF viewer allows you to open and view several types of files and is being used here to allow readers to view DWF (Design Web Format) files created in software such as AutoCAD. You can download and install viewers e.g. Autodesk or AutoDWG. Through a browser, the plugin allows readers to pan, zoom and 'turn off' layers within the images being displayed and are offered here as an alternative to static raster files.
Panning shifts the location of the view without changing the magnification. You can continue to pan beyond the edge of the window for the width and length of an image. To pan across an image: right-click in the image and select the Pan option, then click in the image and drag the mouse in the direction you want to to pan. To select another option, right click again and select Cancel.
Zooming changes magnification. You can zoom in and out dynamically with cursor movement, or you can magnify a specific area by drawing a zoom window around it. To zoom, right click in the image and select the zoom option, then select either In/Out (to use your mouse to zoom in and out) or select window to zoom into a specific area.
You can also turn available layers on and off in the DWF files (note that the availability of a drawing's layers depends on the layers being created when the file was first saved). To turn a layer on and off, right-click in the drawing, and then click Layers. In the Layers dialog box, select the name layer to turn on or off and click the light bulb icon (Blue indicates off; yellow indicates on).
Other options available include being able to add your own textual or other graphic annotations. Internet Archaeology would like to acknowledge the work of Guy Hopkinson who created the DWF images for this article.