Let’s say that you’re looking at an image of yourself on a roller coaster and want to see if your terrified expression has been caught on camera. What do you do? Something like this?
On a mobile phone you can pinch out to zoom into an image and pinch in to zoom out.
The action of using your fingertips to zoom in and out of the image is an example of a direct-manipulation interaction. Another classic example is dragging a file from a folder to another one in order to move it.
Moving a file on MacOS using direct manipulation involves dragging that file from the source folder and moving...