[pygame] Capture tablet pressure?

[Eric Pavey]

Been searching around, and haven't come up with anything:  Anyone know how to capture tablet pressure in Pygame?  Pygame recognizes my tablet (Wacom Bamboo) just fine as a mouse, buttonclicks etc, but no "pressure" based on those clicks.  Any advice?  Is it possible that SDL doesn't support tablets?

thanks

[James Paige]

No, I'm pretty sure SDL does not have any pressure support. Although I
think that pressure sensitivity and multitouch may be planned for SDL
1.3/2.0, (maybe somebody can correct me if I am mistaken on that)

I remember hearing a rumor that pygtk supports pressure sensitivity, but
making pygame and pygtk work together might prove to be more trouble
than it is worth.

Also, some quick googling turns up pymt, which might be helpful, but I
haven't tried it myself.

---
James

[Jake b]

maybe this? http://stackoverflow.com/questions/45500/wacom-tablet-python-interface

I'm definitely interested if you get python+wacom pressure working.

Maybe you can read events yourself ( but would make it platform specific )?


--
Jake

[machi...@gmail.com]

i think you could use cgkit. it includes a wintab wrapper if i remember correctly.

[Eric Pavey]

So I tried the cgkit\wintab route.  Had some success, but still can't get the dang pressure.  Below is the code I came up with if anyone wants to poke at it  When ran, it prints stuff like:

<Packet btns:1 x:10937 y:2140> 0 0

With the last two values representing pressure.  Well, it's a start ;)

# pressure.py
import os
import pygame
from cgkit import wintab


pygame.init()

hwnd = 1024
os.environ["SDL_WINDOWID"] = str(hwnd)

def main():
    screen = pygame.display.set_mode((640, 480))
    background = pygame.surface.Surface(screen.get_size())

    background.fill(pygame.color.Color("Black"))
    screen.blit(background, (0,0))

    #--------------------------------------------
    # Creates a "Context" object:
    tablet = wintab.Context()

    tablet.open(hwnd, True)

    looping = True
    while looping:
        events = pygame.event.get()
        for event in events:
            if event.type == pygame.QUIT:
                # allow for exit:

                looping = False

        #--------------------------------------------
        # Get a tuple of range of packets captured: (first, last)
        packetExtents = tablet.queuePacketsEx()
        if packetExtents[1] is not None:

            # This is a sub-list of Packet objects:
            packets = tablet.packetsGet(packetExtents[1])
            # Get the last Packet object:
            packet = packets[-1]
            # Print packet info, and pressure data:

            print packet, packet.normalpressure, packet.tangentpressure

        pygame.display.flip()
    pygame.quit()

if __name__ == "__main__":
    main()

[Eric Pavey]

If anyone is interested, I got this working.  Posted on my blog\Pygame, with pointers to source download:
http://www.akeric.com/blog/?p=777
http://www.pygame.org/project-Tablet+Pressure-1302-2287.html

[René Dudfield]

sweet :)  nice work.