Comments on: Windows 7 and WPF 4.0 Multitouch: Manipulation

By: Melvyn Howling

Melvyn Howling — Wed, 22 Sep 2010 17:23:12 +0000

Does anyone know how to constrain the item being manipulated to its parent? I’m trying to zoom/pan an image, but I don’t want the use to be able to drag it all over the window.

By: Andrew Eichacker

Andrew Eichacker — Fri, 09 Jul 2010 04:13:45 +0000

You can choose which manipulations to perform in the ManipulationDelta handler. For example, to only zoom (which is equivalent to scaling), use only the scaling method for the matrix:

rectsMatrix.ScaleAt(manipDelta.Scale.X, manipDelta.Scale.Y, rectManipOrigin.X, rectManipOrigin.Y);

By: michael macher

michael macher — Thu, 08 Jul 2010 14:28:55 +0000

thanks Andrew. It works good, I was trying to ZOOM, Pan and Rotate an image in WPF same way as it can be done in windows picture viewer. Your code moves the image from its location I was trying to make the image stay at its place and zoom through pinch and rotate by 90 degrees for one rotate gesture and pan it after it zooms. Basically I was trying to design something which works like the picture viewer. I have been trying to get this done but unable to make it do you have any suggestions? please help.

By: Andrew Eichacker

Andrew Eichacker — Wed, 07 Jul 2010 21:45:48 +0000

Sure, just set IsManipulationEnabled to true for your Image object. Don’t forget to handle the ManipulationStarting and ManipulationDelta events.

By: michael macher

michael macher — Wed, 07 Jul 2010 20:30:45 +0000

great work, I am trying to implement something similar but should work like the windows picture viewer, performing the basic zoom, pan and rotate on single static image. Do you have any suggestions?? please help.

By: Windows 7 and WPF 4.0 Multitouch: Inertia | Between the Lines

Windows 7 and WPF 4.0 Multitouch: Inertia | Between the Lines — Fri, 02 Jul 2010 23:04:06 +0000

[...] 4.0's manipulation events certainly made things easier to write an application that supports multitouch gestures. After you [...]

By: Andrew Eichacker

Andrew Eichacker — Wed, 12 May 2010 13:38:37 +0000

Thanks, Brent. Appreciate the comment. Always great to hear from people who are putting my posts to good use!

By: Brent P

Brent P — Tue, 11 May 2010 18:55:06 +0000

Just dropping a note to say many thanks for the multitouch posts and keep ‘em coming. I’ll be playing with the multitouch features of .Net 4 in the coming weeks so this blog is about to become my new best friend and I can’t wait to put your examples into action.

So many thanks, your work is appreciated.

By: WPF 4.0 Multitouch: Touch Points | Between the Lines

WPF 4.0 Multitouch: Touch Points | Between the Lines — Thu, 29 Apr 2010 15:27:46 +0000

[...] Update: if you're looking to just implement standard multitouch gestures, check out my post on manipulation. [...]