maemo.org - Talk - View Single Post - Software emulation of dualtouch input possible?

	ysss	2011-01-12 , 15:16
	Posts: 4,384 \| Thanked: 5,524 times \| Joined on Jul 2007 @ ˙ǝɹǝɥʍou	#22

Originally Posted by gerdich

The system sees one point at different times at different locations.
That's very much and enough to emulate all multitouch gestures in a specific way.

Multitouch is not useful on little devices. The screen is to little. And the precision of a finger is nothing against the precision of a stylus.

There are good single touch emulations of all multitouch gestures. We have only to implement them.

Here's a common multitouch gesture with just 2 fingers (most multitouch screens are capable of processing more than 2 points at a time), let's see how you emulate this:

2 touch points on screen = zoom, rotate and pan an image.

Yes, all 3 can be done together at the same time:

- When the two fingers are moved closer/apart: the image will zoom in/out)
- When the two fingers are rotated against the other: the image will rotate according to the direction
- When the two fingers are moved around screen (maintaining their relation to one another): the image will pan.

This is commonly used in image manipulation apps, while the single finger gesture is used for the main interaction:

For photo browsing: single finger actions are used for changing photos.

For drawing apps: single finger actions are used for drawing.

Notice that the system does not need to change into different modes via UI buttons or key combinations, it just recognizes the different types of multitouch and applies the operations immediately.

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