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--- viewport [2022/02/07 17:47]
yves [Keeping track]
+++ viewport [2022/02/07 19:33]
yves [Zooming in]
@@ Line 29: / Line 29: @@
 {{ ::viewport_panning4.png?direct&400 |}}
 ==== Zooming in ====
+PMA.UI's viewport offers different ways to zoom in on a slide.
+The simplest way is to use the scrollwheel on your mouse: pushing the scrollwheel forward (away from you) lets your zoom in; bringing it toward you (or scrolling //backwards//) zoom out again. Furthermore, we've optimized the speed of interaction so that you can go from the highest level of viewing to the deepest level in one smooth sweeping motion.
+If you don't have a mouse, or want precision control, you can use the zoom controls in the top-left corner of the screen, too. There are plus and minus button to zoom in (increase magnification) or zoom out (reduce magnification).
+{{ ::viewport_zooming1.png?direct&200 |}}
+There is also the zoombar. You interact with that one by moving the slider up and down to control your magnification.
+{{ ::viewport_zooming2.png?direct&200 |}}
+The zoombar is useful even if you don't use it to control your magnification: it also indicates whether you are looking at content through optimal magnification or digital pmagnificaion.  The number of articifically added zoomlevels for digital zoom can be controlled in PMA.UI, or even disabled altogether.
+{{ ::viewport_zooming3.png?direct&200 |}}
+On mobile devices, //pinching// also works (use the pinch manoever to rotate your content, too!).
 ==== Keeping track ====
-{{ ::viewport_tracking.png?direct&400 |}}
+The thumbnail widget has a special button that allows you to track your progress throughout a slide:
+{{ ::viewport_tracking.png?direct&200 |}}
+Once enabled, a gray overlay covers your slide's thumbnail, with pieces of it gradually disappearing, as you start navigating your side. The zoomlevel at which you inspect a specific region of interest, influences the outline color in the tracking screen.
+{{ :viewport_tracking2.png?direct&400 |}}
-==== Color control ====
+This kind of tracking is instantaneous and ad-hoc. When you close the viewport, it disappears, and its history is not logged. If you're interested in tracking viewing operations over time and across your use population, you should have a look at the [[heatmap]] functionality instead.
+==== Color correction ====
 The default PMA.UI representation in PMA.core shows a color correction widget in the top-right corner of the viewport.

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