Code Notes

class "TouchArea (TouchArea.cs)" is what captures the touches

• red box defines the touch area
• constructor has this.opacity to set opacity

set opacity of touches in MainWindow.xaml.cs:

• instance of TableControl has property Opacity
• this also affects opacity of red box

set opacity of primary window in MainWindow.xaml

• Background 1st 2 hex digits = opacity. Lower is more transparent
• opacity of 00 creates click-through so use 01 as lowest setting

remove/add cursor in "MainWindow.xaml.cs" (win10 only?)

• this.Cursor = Cursors.None (comment or uncomment)

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TUIO Protocol subset i.e. as it pertains to touch table code only

• Protocol format: /tuio/2Dcur <msg> <parameter list separated by spaces
• each blob gets a unique ID (incremented from last blob's ID)

TUIO messages

There are 3 classes of messages sent by the TUIO protocol as it pertains to this code

set

• format: /tuio/2Dcur set blob_id x_pos y_pos x_vel y_vel m_accel
• a separate set command is sent for each blob
• example: /tuio/2Dcur set 5585 0.125776 0.590743 -0.172729 0.019989 0.0115921
• we only need to be concerned with the x_pos and y_pos. The other values are ignored in the code
• x_pos and y_pos values are normalized to between 0 and 1

alive

• format: /tuio/2Dcur alive blob_id0 ... blob_idN
• example: /tuio/2Dcur alive 5585 5587

seq

• format: /tuio/2Dcur fseq incrementing_frame_id
• this appears to be used in the code for timing so is required

execution

following what appears to be the model from CCV 1.x back in the day from looking at sample data

• send data at framerate
• for each frame:
  • send any set messages
  • send alive message
  • send seq message
• no need to send a set message on touchdown

TouchTable Pd notes

• the code already scales everything to aspect ratio of 640/360 regardless of resolution
• this C# code does not need to be concerned about resolution or aspect ratio. Just send x and y values between 0 and 1
• the 1920x1080 resolution will need to be hardcoded in the Pd code at some point. There is no aspect ratio change for this resolution.