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WPF Multi touch

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06-28-2010 02:48 AM
linusang
by
Emerging Contributor
‎06-28-2010 02:48 AM
Hi,

Would like to know if multitouch-able Map object is in the pipelline?

i created my own multi-touch behavior attached to the map object and it lags when i add a feature layer... however when i use the mouse, there is no lag.... so i'm guessing my algorithm is doing some heavy processing to get the Map rendered...

thanks
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10 Replies
linusang
by
Emerging Contributor
‎10-12-2010 07:03 PM
Are you seeing smoother animation when you use the mouse, compared to touch? If not, it could just be a performance issue with your graphics card. Especially if you are running your app at fullscreen (1920x1080 I assume), which requires loading a lot more tiles and large images compared to what the iPad would have to do. Also if you have a lot of layers and client side graphics, you are rendering more than you would be doing on the iPad.

However if you do see smooth animation when using your mouse, but not touch, it could be your touch device itself.
We have quite a few different touch screen devices here for testing, all using different touch technologies (although we don't have the Dell screen you mention). We've seen very different performance with these screens. Some are very flaky with respect to the consistency of the touch points reported, which in turn can make the touch experience less optimal. This is especially the case for the screens that are based on cameras in the corner just like your Dell screen.
We also have iPads here and have been comparing the touch experience to our WPF/Silverlight API, and in most cases its very comparable in the "feel" of it. Personally I have Lenovo x201 tablet, and this screens works very well with the WPF API.


Thanks for the reply.

I do agree with you that monitors based on optical has this issue of not detecting the touch points correctly.

Anyway i notice some abnormalities when i'm playing with v2.1 multitouch comparing with the behavior i wrote for v2.0. Doing a stretch manipulation, with one finger being stationary, the zooming doesn't appear to zoom proportionately. Attached is 2 solutions, one written with the behavior i wrote for 2.0 and the other is V2.1. Maybe someone with a Win7 multitouch device can verify that?

http://cid-ec790852be322dbd.office.live.com/self.aspx/.Documents/MultiTouchTest.zip

and also, i'm not sure if you guys should differentiate between manipulations and gestures? here is a blog post that explains it if anyone is interested http://blog.rongeorge.com/design/interaction-design/terminology-the-difference-between-a-gesture-and...

Thanks
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