mirror of
https://github.com/rfc2822/GfxTablet
synced 2025-10-03 17:49:17 +02:00
31 lines
1 KiB
Text
31 lines
1 KiB
Text
Network protocol used by GfxTablet
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Version 2
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---------
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GfxTablet app sends UDP packets to port 40118 of the destination host.
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Packet structure, uses network byte order (big endian):
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9 bytes "GfxTablet"
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1 unsigned int16 version number
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1 byte event type:
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0: motion event (hovering)
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1: button event (finger, pen etc. touches surface)
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1 unsigned int16 x (using full range: 0..65535)
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1 unsigned int16 y (using full range: 0..65535)
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1 unsigned int16 pressure (accepting full range 0..65535, but will clip to 32768 == pressure 1.0f on Android device)
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when type == button event:
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1 signed int8 button id:
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-1: stylus in range pseudo-button
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0: left click / stylus in contact / button 0
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1: extra button 1
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2: extra button 2
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1 byte button status:
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0 button is released ("up")
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1 button is pressed ("down")
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