Hi everyone, I wanted to write to the list about two things - 1) zooming in the browser, photo viewer, etc, and 2) 'swiping' instead of typing
1) Today I took a break from writing an i2c driver, and thought about how great mult-touch screens are. Specifically, I really like the ability of [a certain unnamed device, not that I own one] to zoom in and out of a page while running the browser. With [said device], the user places two fingertips on the screen and zooms in by moving their fingertips closer together. Zooming out is the opposite. I only know the basics about how touchscreens work, but I do know that some similar input devices (namely of the synaptics type for laptops) actually register different paths that the fingertip traces, producing programmed events accordingly. Assuming (well, hoping really) that could also apply to the touch-screen on the Neo or FR, I thought of these two which are analogous to using a screwdriver: clockwise circle == zoom in counter-clockwise circle == zoom out Are there any hardware engineers who can verify whether or not the touch-screen on the Neo or FR could register or generate motion-based events? If not, is this something that could be done easily in userspace (i.e. inputproto)? 2) Swiping (as some people have named it), is an input method for mobile devices with on-screen keyboards where a word is spelled out in entirety without lifting the finger from the touchscreen. There are several companies that have claimed a patent on swiping, including Apple, the company behind T9, and others. I really don't need to point out the obvious conflict which the USPO has created, but I thought I would anyway. In any event, there are many places in the world where software is non-patentable (and hopefully that remains so). So for those of us who live in those parts of the world, wouldn't it be nice to 'swipe' on the Neo or FR ? I did some really similar lab work at university a while ago which I think is the underlying mechanism for swiping. The curve that the finger takes is encoded as a series of corners and points projected onto the complex coordinate system. The discretized signal is then complex, but 1-dimensional (like audio), which is really easy to pack and store in a database. Pattern matching involves Fourier analysis of the encoded path. The first component of the Fourier-transformed signal is the 'centre of mass'. The sum of the first two components is an ellipse that encircles all of the corners. The sum of successive components result in a signal that increasingly resembles the path of the finger. Does anyone have any questions / comments about 'swiping' ? Would anyone want to implement it on the Neo / FR ? Cheers, Chris _______________________________________________ devel mailing list devel@lists.openmoko.org https://lists.openmoko.org/mailman/listinfo/devel
