Re: some very cool features for a capacitive touchscreen
2013/10/24 Sameer Verma sve...@sfsu.edu I saw some very cool features in a presentation today at the Internet Archive. The presentation was by Eitenne Mineur, as part o the Books in Browsers 13 event. They are using paper and other simple objects that have kind of conductive patterns to create story platforms, but with interactivity. Start with a story screen, place a paper cutout of one of the characters, and the story comes to life. Place a second character, and the scene changes. All very interesting ideas for us to use on the XO-4 Touch, although the XO4 does not use capacitance, but the idea is very cool. http://volumique.com/ Wow, this is very inspiring. Somebody should try this technique on an XO-4. -- .. manuq .. ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: some very cool features for a capacitive touchscreen
On Fri, Oct 25, 2013 at 1:40 PM, Manuel Quiñones ma...@laptop.org wrote: 2013/10/24 Sameer Verma sve...@sfsu.edu I saw some very cool features in a presentation today at the Internet Archive. The presentation was by Eitenne Mineur, as part o the Books in Browsers 13 event. They are using paper and other simple objects that have kind of conductive patterns to create story platforms, but with interactivity. Start with a story screen, place a paper cutout of one of the characters, and the story comes to life. Place a second character, and the scene changes. All very interesting ideas for us to use on the XO-4 Touch, although the XO4 does not use capacitance, but the idea is very cool. http://volumique.com/ Wow, this is very inspiring. Somebody should try this technique on an XO-4. Unfortunately because of the way our touch technology works, this exact implementation won't work. However our touch technology is actually nicer because you don't need special material to activate the touches. I think what would work well for us would be an activity that allowed you to program what shape/character was attached to different size touch points. Then use small wooden/plastic disks of different sizes glued or clipped to the back of the cutouts to trigger the touch events and let the program know what story to tell. smallest disk = dog medium disk = frog large disk = frisbee I would have to double check but I think we pass along the touch width as the pressure value for evdev. Should be easy to parse the event and figure out what is on the screen, and should work with 2-4 touches/items. -Jon ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: some very cool features for a capacitive touchscreen
The last time I checked, the width was as pressure in evdev, but was not available in the gtk event. Another option is prepare circles of may be 5 mm and paste them behind the figures, in different positions. A program can detect that circles as touches, and recognize the figure using the relative postions. Our touch screen can detect 4 touches, but can be confused if are aligned in horizontal or vertical. Gonzalo On Fri, Oct 25, 2013 at 8:50 AM, Jon Nettleton jon.nettle...@gmail.comwrote: On Fri, Oct 25, 2013 at 1:40 PM, Manuel Quiñones ma...@laptop.org wrote: 2013/10/24 Sameer Verma sve...@sfsu.edu I saw some very cool features in a presentation today at the Internet Archive. The presentation was by Eitenne Mineur, as part o the Books in Browsers 13 event. They are using paper and other simple objects that have kind of conductive patterns to create story platforms, but with interactivity. Start with a story screen, place a paper cutout of one of the characters, and the story comes to life. Place a second character, and the scene changes. All very interesting ideas for us to use on the XO-4 Touch, although the XO4 does not use capacitance, but the idea is very cool. http://volumique.com/ Wow, this is very inspiring. Somebody should try this technique on an XO-4. Unfortunately because of the way our touch technology works, this exact implementation won't work. However our touch technology is actually nicer because you don't need special material to activate the touches. I think what would work well for us would be an activity that allowed you to program what shape/character was attached to different size touch points. Then use small wooden/plastic disks of different sizes glued or clipped to the back of the cutouts to trigger the touch events and let the program know what story to tell. smallest disk = dog medium disk = frog large disk = frisbee I would have to double check but I think we pass along the touch width as the pressure value for evdev. Should be easy to parse the event and figure out what is on the screen, and should work with 2-4 touches/items. -Jon ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: some very cool features for a capacitive touchscreen
Sorry, did I say 6mm wide? I was inaccurate. The objects should be 8mm wide. It might well work with less, but I'm reading from the design specifications which describe use of stylus, so it would be better to use 8mm width. Or do a whole lot of testing to be sure. http://wiki.laptop.org/go/XO-4 http://wiki.laptop.org/images/0/0c/CL4_Hdwe_Design_Spec.pdf At least two simultaneous touch points are supported, with additional simultaneous touches supported in some interface layouts. The touchscreen detects fingers or a soft-tipped stylus, as long as the stylus has a diameter of 8 mm or larger (measured within a mm of the end.) -- James Cameron http://quozl.linux.org.au/ ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: some very cool features for a capacitive touchscreen
Sounds interesting. For the XO-4, use objects that are at least 3mm thick (front to back), at least 6mm wide, and opaque to infrared. There's a piano keys mode used by an activity, in case further code tricks are interesting. -- James Cameron http://quozl.linux.org.au/ ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
