4/1/2023 0 Comments Touch screen multitouch![]() ![]() The MSDN article explains how to do this using the Visual Studio project wizard tool. For the second edition of the article I have changed the code so that touch points being held on the screen will keep their state no matter what is happening at other touch points. In the first edition of this article, the sample application would change the colour of a circle held on the screen depending on what was happening at other touch points. ![]() Of particular interest to me, since I am hoping to implement multi touch functionality in my own custom control at some point in the future, was to find a clear and reliable way to achieve statefulness of the touch points. Once I got the MSDN article code to run I made changes to it to improve its stability by removing memory leaks and making changes to the way touch point information is stored. My aim, therefore, in writing up this commentary (that is quite closely based on the MSDN article) is to hopefully provide a smoother start for other people wanting to get going with multi touch. It was quite hard for me going through the article and applying the fixes Tom1omT and duggulous had given and then finding one or two other things that still needed fixing. So we play with it and worry at it until we find out what can be changed to make it more satisfying and/or usable. The code works and demonstrates what it is supposed to but there are a few more things to do to it before it is ready to used in another project. We open up a project and copy and paste the code in. Guys like me come and want to find out how they work. I guess there is educational value in these articles being a bit rough around the edges. So - I have started looking at implementing multi touch for my custom control and searching for ways I could do this and the first real progress I have made is based on the MSDN article at. Experimenting with multi touch, however, seemed like a dream for the distant future until about a week ago when I was able to get my first touch screen laptop computer (a Toshiba C55T-10K - on a substantial discount!). I have been working on a custom control for ages now - one which, for a long time now, I have known could benefit from having a multi touch interface. Store and mark executable (call the script to see its input options).Watch this YouTube video to see what this program does. If the touchscreen is not working properly, you may need to install a specific driver for your touchscreen, see #Drivers. If the touchscreen is detected you should submit your devices' details (relevant lsusb line) to the linux-input mailing list. # echo 3 0eef 725e 259 > /sys/module/hid_multitouch/drivers/hid\:hid-multitouch/new_id In this example, the touchscreen is an USB device, so BUS=3 and the previous command looks like this: # echo BUS VID PID MT_CLASS_* > /sys/module/hid_multitouch/drivers/hid\:hid-multitouch/new_id ![]() You need to convert MT_CLS_* to decimal (In this case, 0x0103 is 259 in decimal).Īfter loading the hid-multitouch, see Kernel modules, you need to pass the devices' options with If none of this matches your device, you can try to experiment with the other MT_CLS_*. Currently vendor specific classes are available for 3M Cypress and eGalax. Now, get the MT_CLASS_* definitions from. Since Linux Kernel 3.2, multitouch devices are handled by the hid-multitouch module, see Kernel modules.įind the vendor ID (VID) and product ID (PID) for your touchscreen using lsusb:īus 004 Device 002: ID 0eef:725e D-WAV Scientific Co., Ltd ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |