Tablet Mapping

Tablet to Display Mapping

This is atopic for MovALyzeR.

The procedures and tests for display mapping options for various tablets are described in this section. Perform all the different tests to completely understand the procedure.

* Driver Settings

* MovAlyzeR settings

* Printing Elements/Stimuli Real Size

Driver Settings

First verify the driver properties: Control Panel > YourTabletDriver (Eg., Wacom) > Properties > Mapping/Speed tab.

o Reset all to default values if you have previously changed some settings (for Wacom tablets: click 'Reset Tablet to default').

o Verify that the entire tablet is mapped to the entire display and the aspect ratio is to-fit.

In Wacom: Tablet area = Entire tablet; Display Area = Entire Display; Aspect = Proportional; Orientation = Landscape.

MovAlyzeR Settings

Since the Wintab Driver does NOT pass its mapping properties on to MovAlyzeR, any kind of mapping must be done ONLY in MovAlyzeR.

MovAlyzeR > Settings > Select Input Device > Tablet Mapping

A. Choosing the Tablet area

o Specify the width and height of the display in cm.

o Tablet width and height: The height and width of the portion of the tablet to be used, measured from the bottom left corner of the recording window.

1. To use the entire tablet, specify the original width and height of the tablet.

2. To use a portion of the tablet, specify the size of the tablet as the area required instead of the actual area.

For example, suppose the actual size of the tablet is width =12" and height = 12". If a mapping of tablet width = 12" and tablet height = 9" from the bottom left corner is needed, specify 30cm (12") and 22.5cm (9") in Tablet size boxes.

Effectively you have a tablet mapping as below:

NOTE: MovAlyzeR will read only the mapped part of the tablet.

B. Mapping Options

NOTE: In this section, the term 'Tablet' will refer to the tablet area mapped as in the section above (Entire or Portion).

1) Tablet to Entire display

Settings: Choose options 'Entire Desktop' and 'Proportional' > click ok to save and close.

Corresponding Experiment Settings:

Select the experiment > right click > Experiment settings.
Choose the option, 'maximize recording window'. (The recording window expands during recording to fit almost the entire display, excluding the toolbars).

Test:

Create a test experiment, group, subject and condition in MovAlyzeR.
Select the scratch Subject > right click > Run experiment.
Record a trial by placing at pen at (0,0) of the recording window and moving it to the top right corner.
During recording, the entire diagonal will not be shown in the recording window, but is recorded.
Verify that in Trial > right click > Chart data > Chart processed data > x,y chart.
The diagonal would be such that the longer dimension of the tablet portion is accomodated. (e.g., if a 20x15 cm portion of a 30x30cm tablet is mapped, then the x-size of the diagonal would be 20 cm, but the y-size is smaller than 15 cm).
When using a stimulus, the origin from which the target position is measured is that of the display and hence the targets are shifted. On the tablet, the corresponding target position will still be in the same position as defined.

2) Tablet to Recording Window

Settings: Choose options 'Recording window' and 'proportional' > click ok to save and close.

The entire tablet is mapped to the recording window as follows:

Corresponding Experiment Settings:

Experiment > right click > Experiment settings > Recording

Option (1): Check option 'Maximize recording window'.

The recording window expands during recording and the tablet is mapped proportionally to this.

Option (2): Check option 'Make recording window real-size' (REAL SIZE TARGETS).

In experiments with visual feedback, it is crucial that the size of the targets on the computer display and the tablet are real-size. Additionally, the recording on the tablet when visually fed back should reflect the actual sizes of the strokes.

Test:

For Option (1)

Select the scratch Subject > right click > Run experiment.
Record a trial while producing a diagonal from (0,0) of the recording window to the top right corner.
During recording, the entire diagonal should be just visible inside a portion of the recording window.
Verify the data by Trial > right click > Chart data > Chart processed data > x,y chart .
The diagonal should measure from 0,0 to x-size,y-size (of the mapped portion of the tablet) .
For Option (2)

Test 1:
- Select the scratch Subject > right click > Run experiment.
- Record a trial while producing a diagonal from (0,0) of the recording window to the top right corner.
- During recording, the entire diagonal should fit exactly with the recording window on the screen.
- Verify the data by Trial > right click > Chart data > Chart processed data > x,y chart .
- The diagonal should measure from 0,0 to x-size,y-size (of the mapped portion of the tablet) .
  Test 2:
- Define an element > Square of 1x1 cm in the middle of the tablet portion (x-halfwidth=1cm/2, y-halfwidth=1cm/2).
- At the center of the tablet (Center point X= tablet portion width/2 and Centerpoint Y = tablet portion height/2).
- Create a new stimulus > add the element to the stimulus. Then add the stimulus to the experiment condition.
- Experiment > Run a trial > Measure the size of the stimulus on the screen, using a ruler.
- The data should be exactly 1x1 cm.
- Run another trial > Make of recording by drawing on the outline of the stimulus square.
- Verify the data by Trial > right click > Chart data > Chart processed data > x,y chart .
- The recording should show a square of 1x1 cm.

Printing Elements/Stimuli Real Size

To print a stimulus in real-size on paper (i.e., the same size as on the digitizer), so that subjects can perform writing tasks with direct visual feedback instead of displaced visual feedback via the display, MovAlyzeR needs to know the actual sizes of the x and y axes produced by the particular printer.

Chart the stimulus by right clicking the particular stimulus > Chart or > Properties >Chart.
Check MonoChrome.
Print (yielding an as-is print).
Measure the actual size of the x and y axes (e.g., 21 cm and 14 cm, respectively).
Specify these sizes in MovAlyzeR by right clicking inside the stimulus chart > Customization > Axis. Fill out the min and max of the x-axis (e.g., 0 cm and 21 cm, respectively) and similarly 0 cm and 14 cm for the y-axis.
Print (yielding the real-size print).

Getting Started: Recording Devices | MovAlyzeR to Test Digitizers