gesture controls using the pen button for commands such as zooming, undo, cut/paste, etc.įinally, one non-requirement.a visible grid or `snap’ feature to line up objects, and.a stylus button that starts lasso selection of pen strokes and switches to drag/scale/rotate mode when the selection is done,.a stroke eraser that uses the dedicated eraser tip or a scratch-out gesture,.shape recognition that recognizes and inserts a geometric shape (line, circle, polygon, arrow) when an approximate shape is drawn,.Examples of these features, not all of which are available in any single program, include: This means that most drawing functions must be available without having to switch out of “ink capture” mode. Interfaces that require a keyboard or mouse are awkward to use while giving a lecture. Secondly, the user interface must work efficiently using only a stylus. But mouse drivers cannot deliver the resolution required to accurately reproduce pen strokes. Most drawing programs are designed to use a mouse. The most important requirement is that the software must be written to input from a graphics tablet driver in order to accurately capture pen strokes. I’ve tried many drawing programs to try to find ones that work well for this application. I’ve found it easier to write with a stylus on a tablet PC than to use a separate graphics tablet and both are much easier to use than a mouse. Compared to an overhead projector the tablet never runs out of transparencies or pens, it’s easy to put the notes on-line and I don’t end up with a binder full of useless transparencies at the end of the term. But the tablet lets me write text, equations, diagrams and graphs. I use them to present lecture notes and to work out solutions to exercises in the same way that I used to use an overhead projector.Īs you can tell from the diagram above, I am no artist. For the past year I’ve been using a tablet PC and a video projector in my classes.
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