Defining Keys

Before calculating metrics, the user must define the text entry keys on the keypad. The user does this by dragging the mouse diagonally across each key's region on the keypad's image. This creates a bounding rectangle, representing the key's location relative to all others. In the dialog that appears, select the attributes applicable to that key.

A letter key inputs letters of the alphabet. For such keys, select the checkboxes that correspond to the associated letters. Note that each letter can be associated with only one key. To enforce this, selected checkboxes are disabled when defining subsequent keys. The checkboxes become re-enabled when editing the associated key, or after that key is deleted.

The NEXT key is the key that presents the next word in an ambiguous set, and the SPACE key is the key that accepts the displayed word and terminates it with a space. Only one key can represent each functionality.

Each key must have a one-character identifier. For letter keys, the default identifier is the first character associated with it. For the NEXT and SPACE keys, the identifiers are "N" and "S", respectively.

The user can also define whether the key is typically pressed with the left thumb, right thumb, or is equally accessible to both thumbs. These options are equally applicable to input via fingers, or styli.

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