Ask your user to use their nail, it works much better than the finger itself, and it's more precise too. And it doesn't get the screen dirty. Whenever I don't pull my stylus, I use my little finger, I can even write Graffiti for a quick phone lookup. You may notice cashiers with touch screens do that too.
-- Luc Le Blanc steve a écrit : > .. There is a hardware limit: the touch screen. > > It think all palm device are using capacitive touch screen. > > A capacitive touch screen is two layers separated by a gel. The layer on > the side of the user has small cuts arrange on a grid. When a pen > presses on the touch screen, the capacity (like a condenser) of the > touch screen changes due to the borders of small number of cuts under > pen are bend in the direction of the other layer. The problem with a > finger, the borders of the cuts under the finger are not so much bended > and much more holes are bended. This gives different a capacity. > > And if the controller does not try to do smart processing in the case of > contact with a finger; you have no contact or a contact not > corresponding to the touch of a finger. > > You have two solutions: > -make larger cuts and more spaced... I think this is out of your > reach and this would make the device less precise. > -use a wave touch screen instead of a capacitive. Perhaps palm > will have those; they are not made with plastic but glass so they > scratch less easily. > -try to do smart things with the few information you have. This > works but it really takes time to find out. > -ask the user to press harder... hoping there finger will not > break the lcd. > > Steve. > > > -----Original Message----- > > From: [EMAIL PROTECTED] > [mailto:bounce-palm-dev- > > [EMAIL PROTECTED] On Behalf Of JP > > Sent: Monday, December 29, 2003 11:07 PM > > To: Palm Developer Forum > > Subject: Re: Pen Down Area? > > > > I have used eventP->screenX, no difference in sensivity of screen > area. A > > flat finger dosnt return a X value, > > > > > > "Aaron Ardiri" <[EMAIL PROTECTED]> wrote in message > > news:[EMAIL PROTECTED] > > > > I have written an app the that displays buttons on scree, uses use > > there > > > > fingers/thumb to press the button, however if the person has a > flat > > finger > > > > then the button doesn't depress, the calc application seem to > handle > > finger > > > > presses better, any ideas? > > > > > > > > Here is the code I am using > > > > > > > > switch (eventP->eType) > > > > { > > > > case penDownEvent: > > > > PenGetPoint(&penX, &penY, &penDown); > > > > > > why are you using PenGetPoint? (your API?) how about: > > > > > > eventP->screenX and > > > eventP->screenY > > > > > > why not use the values you are provided? > > > > > > --- > > > Aaron Ardiri > > > [EMAIL PROTECTED] > > > http://www.mobilewizardry.com/members/aaron_ardiri.php [profile] -- For information on using the Palm Developer Forums, or to unsubscribe, please see http://www.palmos.com/dev/support/forums/
