Multi Touch In DAT

Summary

The Multi Touch In DAT is used for receiving messages and events from the Windows standard multi-touch API. It captures all the messages, where each new message changes the table it outputs. When a messages is added to the DAT, any script can be called pointing to the new message. The Multi Touch In DAT can be sent to the Render Pick DAT, or used with interactTouch methods in the Panel Component and Web Render TOP. Multi Touch DAT is not supported on macOS.

It can output either of two table formats: (1) Raw Events as a FIFO (first in - first out) list, or (2) ID Table, which is the events processed into a more usable one-row-per-finger table.

The Raw Events format creates a FIFO-type DAT (see also FIFO DAT) which, for each multi-touch event, has a row added to the bottom of the table while at the same time a row at the top is deleted.

Note: To operate panel gadgets with multi-touch screens that send events through the Windows event stream, multi-touch works without requiring DATs. You need to use the DAT when using multiple fingers on one panel, like in a container displaying a 3D render whose objects you want to pick.

The ID table format includes the columns:

• id - every finger press increases the id by 1
• sn - an ongoing count of each finger press.
• select - when 1, this row represents a finger is down.
• downf - the absolute frame number when the finger press occurred.
• upf - the absolute frame number that the finger press ended
• x, y - the position, in pixels in the horizontal and vertical directions. NOTE: The x and y values are expressed in screen pixels, not panel width/height pixels. For example, the top-right corner of a panel will be different if the panel is scaled within another panel, window or network viewer. It is better to use u and v, and scale them by the panel Width and Height.
• u, v - the position, 0 to 1 in the horizontal and vertical directions
• downu, downv - the position, 0 to 1 in the horizontal and vertical directions when the touch first occured (ie. initial touch down location).

contactx, contacty - the width of the contact area. contactu, contactv - the height of the contact area.

• • monitor - monitor number, starting with 0
• clicktime - like downf, in seconds
• elapsedtime - the number of seconds that finger has been down.
• changedtime - the time since the finger press that the most recent u or v value changed.
• dclick - double-tap occurred
• aux - user supplied data via the PanelCOMP_Class method interactTouch(). When the event is triggered by the mouse via the Include Mouse option, aux will include the mouse buttons used (1 for left, 2 for middle, 4 for right, can be tested bitwise).

You can use the attached callback DAT (named mtouchin1_callbacks) to react to multi-touch events. This is suitable for 2D interfaces that do not require a Render Pick DAT.

See the Palette:multiTouch example in the Palette under Tools.

See also the MultiTouch page.

multitouchinDAT_Class

Parameters - Multi Touch In Page

Active active - Registers event when Active is On.

Output outputtype - ⊞ - Sets how the output is displayed in the table.

• Raw Events log - Events are added to the table in a first in - first out (FIFO) order.

• ID Table changes - Events are processed using one-row-per-finger in the table.

Panel panel - The Panel Component to capture the touch events from.

Relative IDs relativeid - Reorder the touch ids so only the ones within the specified panel are counted.

Relative Position relativepos - Output position and normalized coordinates relative to lower left corner of the specified panel.

Include Mouse mouse - When on, the mouse add a touch event when clicked. This event always shares ID 1 with the first touch. Using mouse and multitouch at the same time may result in unexpected behaviours.

Position Threshold posthresh - A new message will not be added if a finger has moved less than this number of units. The units are determined by the input device, not necessarily the resolution of the screen that it is associated with.

Contact Threshold contactthresh - Some touch devices have a width and height of a press, representing pressure of amount of finger contact. This is a minimum threshold below which no events are recognized.

Min Rows Displayed minrows - The minimum number of rows always displayed in the table.

Double Click (secs) doubleclickthresh - The maximum time allowed between clicks to be registered as a 'double-click'.

Parameters - Received Messages Page

Callbacks DAT callbacks - Path to a DAT containing callbacks.

Execute from executeloc - ⊞ - Determines the location the script is run from.

• Current Node current - The script is executed from the current node location (for example, where 'cc' points to).

• Callbacks DAT callbacks - The script is executed from the location of the Callbacks DAT specified above.

• Specified Operator op - The script is executed from the component specified in the Component parameter below.

From Operator fromop - The path that the script will be executed from if the Execute From parameter is set to Specified Operator.

Clamp Output clamp - The DAT is limited to 100 messages by default but with Clamp Output, this can be set to anything including unlimited.

Maximum Lines maxlines - Limits the number of messages, older messages are removed from the list first.

Clear Output clear - Deletes all lines except the heading. To clear with a script command, here is an example: opparm -c /serial1 clear

Parameters - Common Page

Language language - ⊞ - Select how the DAT decides which script language to operate on.

• Input input - The DAT uses the inputs script language.

• Node node - The DAT uses it's own script language.

Edit/View Extension extension - ⊞ - Select the file extension this DAT should expose to external editors.

• dat dat - various common file extensions.

• From Language language - pick extension from DATs script language.

• Custom Extension custom - Specify a custom extension.

Custom Extension customext - Specifiy the custom extension.

Word Wrap wordwrap - ⊞ - Enable Word Wrap for Node Display.

• Input input - The DAT uses the inputs setting.

• On on - Turn on Word Wrap.

• Off off - Turn off Word Wrap.

Info CHOP Channels

Extra Information for the Multi Touch In DAT can be accessed via an Info CHOP.

Common DAT Info Channels

• num_rows - Number of rows in this DAT.

• num_cols - Number of columns in this DAT.

Common Operator Info Channels

• total_cooks - Number of times the operator has cooked since the process started.

• cook_time - Duration of the last cook in milliseconds.

• cook_frame - Frame number when this operator was last cooked relative to the component timeline.

• cook_abs_frame - Frame number when this operator was last cooked relative to the absolute time.

• cook_start_time - Time in milliseconds at which the operator started cooking in the frame it was cooked.

• cook_end_time - Time in milliseconds at which the operator finished cooking in the frame it was cooked.

• cooked_this_frame - 1 if operator was cooked this frame.

• warnings - Number of warnings in this operator if any.

• errors - Number of errors in this operator if any.

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