@PDC09 – Day 3 – Multitouch in Microsoft Surface and Windows 7 for .NET Developers

Multi touch

• …creates new opportunities
  • software that is
• is not new
  • researchers have been exploring this
• is now going mainstream
  • hardware
  • OS
  • SDK’s

Microsoft surface and WPF4

• with surface, microsoft became a thought leader in multi touch
• surface has been shipping a multi touch dev platform for several years
• Touch API’s baked into sdk

WPF 4 Touch Capabilities

• (Beta 1)
  • Manipulation Events (pan, zoom & rotate gestures)
• (Beta 2)
  • Touch Events
  • Extensible Touch Device
  • Win7 Touch Device
• Release
  • ScrollViewer Panning Support
  • WPF controls styles with events

Demo of sample code

• TouchDown, TouchMove and TouchUp events for canvas or any control
• e.GetTouchPoint(_canvas)  - returns the coordinates for the touch point
• _canvas.CaptureTouch(e.TouchDevice)
• each UI element can capture multiple device events
• _canvas.ReleaseTouchCapture(e.TouchDevice)

Multitouch in Web in Silverligh

• Subset of the WPF4 touch input API
  • Reports groups of touch events in “frames”
  • Apps are responsible for hit testing and event routing
• Manipulation & Intertia processor API

Demo WPF Multitouch Manipulation Events

• ManipulationStarting event
• IsManipulationEnabled = true for the elements like Image, to be manipulated for pan, zoom and rotate
• ManipulationDelta event

Demo Manipulation Inertia (s

• ManipulationInertiaStarting event (it is called at the end of manipulation, configure the inertia parameters here)
  e.g we can just scroll or throw the images using finger scroll,
• e.TranslationBehavior.DesiredDeceleration = 0.001;

Inertia behaviors – 1/96th DIP (Device Independent Pixel) per milli sec

Touch Panning Support

• Only in Release Candidate
• Cancel() method on manipulation events
• ScrollViewer handles manipulation events

Microsoft Surface Extensions of WPF

Surface WPF controls

• Designed for multi touch
• Designed for simultaneous user
• Designed for manipulation & inertia

Drawing with Surface Controls

• SurfaceInkCanvas control
• ScatterView control
• SurfaceScrollViewer control

Announcing – Surface Toolkit for Windows Touch

Surface is not just multi touch

• Windows 7
• Massive multi touch
• Multi user experiences
  • Trend : software continues to reduce the need for face to face human interactions
  • Problem
  • Surface bring people together
• Surface Objects
  • Byte Tags (256 unique values)
  • Identity Tags (move unique values)
• Surface Optics
  • Determine the shape and size of every input
  • See into certain objects

Announcing – Surface SDK 1.0 is available for public download