Poison Maps includes two unique (and patent pending) gestures to help zoom or pan around a large document on a smaller touchscreen. We call these gestures "Context Zoom" and "Context Pan", although they are arguably the same gesture but with two separate uses.
On devices with 3D Touch functionality, the force of the touch can be used to control how far you zoom out. This is more immediate than a long touch, and also allows the zoom factor to be controlled at any time, even after the pan has started.
These gestures are not designed to replace the traditional "pinching" type gestures but instead to complement them. In some situations the traditional approach is still best, but in other situations these new gestures are more suitable:
When the screen is very small
The new gestures only require one touch of one finger, unlike the multi-finger gymnastics required by pinching. This makes them particularly useful for very small screens without much room for pinching (e.g. watches).
When the user wishes to stay at the same zoom level but move long distances
The new pan gesture is simpler than pinching to zoom out, panning across and then pinching to zoom in again. This is a common operation, for example when editing a large image or reading a large document or web page.
When the just wishes to see what is around the current area
The new zoom gesture is much simpler than pinching to zoom out and then pinching to zoom in again.
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