Figure 3

Zooming and panning modes. The zooming and panning modes are selected from the View modes toolbar. (a) In Dynamic zoom mode, the user clicks then drags the mouse; based on the mouse motion, the view zooms continuously with independent zoom speeds in the X and Y directions. (b) In Dynamic pan mode, the user clicks then drags the mouse; the direction and distance of the mouse motion determines the speed and direction of the panning motion through the data. (c) In Zoom in mode, the user selects a region (denoted by a "marquee"). The display is zoomed so that the selected region is fit to the current window. The user may also click anywhere within the current window, which zooms in by a fixed scaling, centered on the click point. (d) In Zoom out mode, the user clicks anywhere, which zooms out by a fixed scaling, centered on the click point.