Delimiters for SelectionAction Pen Gesture Phrases in Scriboli

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Delimiters for Selection-Action Pen Gesture
Phrases in Scriboli
Ken Hinckley Patrick Baudisch Gonzalo
Ramos Francois Guimbretiere Microsoft Research
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The Traveling (pen) SalesmanProblem

• Copy Paste 1. Select Lasso Mode

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The Traveling (pen) SalesmanProblem

• 2. Circle objects

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The Traveling (pen) SalesmanProblem

• 3. Invoke Edit Menu

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The Traveling (pen) SalesmanProblem

• 4. Choose Copy Command

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The Traveling (pen) SalesmanProblem

• 5. Invoke Edit Menu again

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The Traveling (pen) SalesmanProblem

• 6. Choose Paste

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The Traveling (pen) SalesmanProblem

• 7. Acquire the copy

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The Traveling (pen) SalesmanProblem

• 8. Drag copy to desired position.

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The Traveling (pen) SalesmanProblem

• The well traveled pen.

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The Traveling (pen) SalesmanProblem

• Waste time moving the pen
• Focus attention on small targets
• Same steps every time
• But what did I forget?

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The Traveling (pen) SalesmanProblem

• 9) Forgot to reselect PEN mode. Oops.

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Pen Computing Now?
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Recognize Pen Gestures?

• Classic problem ink or gesture ?
• Hard problem any gesture could be ink
• All we need to solve this is ONE BIT of info
• Scriboli Make it a physical skill instead of
  guessing game
• physical button on bezel
• nonpreferred hand, no trip to lasso mode
• Next paper Li, Hinckley, Guan Landay
• works really well

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Gestures for Nouns Verbs

• Lasso selection Marking menus
• Crossing selection? Abandon lasso selection?
• How to combine scope command efficiently?

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Delimiters for scope selection marking

• A delimiter is something different
• lexical structure of stroke
• e.g. self-crossing gesture stroke
• VIDEO delimiter techniques

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Experiment Design

• Pigtail, Handle, Timeout, Button X
• Practice 32 trials
• Main Block
• All 8 Marking Directions (N, NE, ) X
• 2 Selection Types (single, or row/column) X
• 5 trials
• 80 main block trials
• Repeated Invocation (RI) Block
• Lasso one item, select E from menu 24x

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Results Completion Time
Button Handle Pigtail Pigtail2
Timeout

• Left bar main block right bar repeated block
• Dotted bars are Pigtail2 design iteration

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Results Learning Effects

• For the 24 trials of Repeated Invocation Block

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Results Error Rate
Button Handle Pigtail Pigtail2
Timeout

• Error rate of selecting wrong marking direction

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Improving Pigtail

• Problems
• 1. Pigtail Size
• No upper bound

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Pigtail Design Iteration

• Problems
• 1. Pigtail Size
• No upper bound
• 2. Pretzels

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Pigtail Design Iteration

• Problems
• 1. Size Limit
• Alt5600 no good
• 2. Pretzels
• 1st intersection? No.

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Pigtail Design Iteration

• Problems
• 1. Size Limit
• Alt5600 no good
• 2. Pretzels
• 1st intersection? No.
• 2nd intersection? Yep.

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Pigtail2 Preliminary Results
Button Handle Pigtail Pigtail2
Timeout

• No errors at all in Repeated Invocation block!

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Scriboli DEMO

• Direct manipulation phase
• Scope, command, manip in one stroke
• Self-revelation techniques
• Disjoint Selections
• Lassos, Crossing, Tapping
• Circles of exclusion

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Conclusion

• Performance data on delimiter techniques
• Data suggest Handle has slight advantage
• But handle was large at 48x48 pixels
• pen up/ pen down spatial mux
• Cant be used e.g. in paper interface
• Pigtail offers design alternative
• Performs almost the same, lasso tough case?
• Seems to offer some unique design advantages

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Future Work

• grammar of building blocks for pen UI
• What are alternative designs for each part?
• More complex phrases possible?

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Questions?
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Handle vs.Pigtail

• Handle can get in the way
• Adds some visual clutter
• Pigtail handles more than one scope elegantly

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Handwriting has a Deep Structure

• Learning cursive
• fast, brief, repetitive, pre-programmed
• variations on oscillatory movements
• The scribbling of Scriboli

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Qualitative Results

• Favorite 7 Handle, 4 Pigtail, 4 Timeout
• Handle
• two strokes disruptive, natural
• Clutter box makes part of screen inaccessible
• Timeout
• good for beginners but I hate waiting for it.
• I felt like I was almost too accurate with it
• Pigtail
• Felt just like handwriting once I learned it, I
  could open up fly!
• Pigtail was trouble. I got a little mad at it.
• Takes a little bit of practice.

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Marking Menus

• Blind Prompted
• Scale-independent in blind mode (333ms)
• Visually-guided in prompted mode

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Preserves scale-independence

• Scale-ind. only matters for blind marking
• Dragging naturally lasts longer

marking starts
visual menu pops up
cross outer boundary
check for crossing
dragging
blind phase
333 ms
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GEdit Kurtenbach Buxton
Delete one obj.
Copy add final C to move
Delete group end stroke inside lasso

• One of the first works considering pen phrases
• Every stroke is gesture
• Only 3 cmds
• Group vs. single obj. inconsistent

Move end stroke outside. Objects move on PenUp.
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FlowMenu Francois Guimbretiere

• Integrates command selection with continuous
  parameter manipulation
• But no blind marking, size of gesture matters

Crossing in?out chooses Item submenu
Crossing out?in chooses Move command
Dragging continues
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Design Philosophy of Scriboli

• RAPID
• Fast motions, repeatable, no waiting / dwelling,
  minimal demands on visual attention
• UNAMBIGUOUS
• No guessing games
• No reco unless I tell the system otherwise
• (There is almost no reco in Scriboli)
• EXPRESSIVE
• Supports many commands, easy to grow design
• Mechanisms for a wide span of pen apps, not
  restricted to specific niche application

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Other Delimiter Techniques

• Handle
• 2 strokes
• Box makes part of screen inaccessible
• Timeout
• 500 ms dwell(stroke-and-hold)
• Button
• Hit when want to bring up menu
• too early / too late

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Questions?