Thread: Touchscreen subpixel accuracy?
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anders_gud is offline anders_gud
2007-11-06 , 21:46
Posts: 118 | Thanked: 297 times | Joined on Nov 2007
#7
Hi!
Thinking of buying one too if someone got around to writing/porting a decent drawing app ;-)

Originally Posted by tjay View Post
Does the touchscreen have subpixel accuracy? If so, what APIs is it exposed through? GTK? Anyone have any idea how good/accurate/stable it is?
I've only found this spec from TexasInstruments for the chip I believe is in the n800.

Originally Posted by tjay View Post
I know the touchscreen is pressure sensitive (yay!). How many levels does it have? Is it uniform across the surface of the screen? What APIs can access it? The howto on maemo.org uses XLib. What about GTK, etc?
The chip is pressure sensitive but it's up to the kernel "driver" to catch and use the input in a proper way. Maybe Nokia has some kernel patches for this (as in the Sharp Zaurus)?
I have an old hp1915 PDA that has a similar controller but the kernel ignores the pressure input.
Anyway, I hope you will get the right answers and start hacking your app. On my 1915 I have built and tried:
SPainter aka "Petite Peinture" (lightweight old Zaurus painting app, horrible aliasing and nice compact UI)
Gimp 2.3.3 (Slow as hell on 64mb RAM - menus to cluttered on 320x240px)
Blender (just for the fun of it - OpenGl software rendering without FPU)
MyPaint (Promising for small devices, Python-GTK+2 based, pressure aware but no layer functions - already runs on maemo check posts on this forum by unique311)
Cheers!
Anders