Silverlight Tip of the Day #103 – Use Integers for Layout Calculations

re: Silverlight Tip of the Day #103 – Use Integers for Layout Calculations

mike.snow — Mon, 24 Aug 2009 16:19:46 GMT

Hi, did you try using UseLayoutRounding ?

Also, it's hard to know what you are doing wrong without seeing the code.

You can post your code here for layout out your map or you can mail me your project and I will take a quick look.

msnow @ microsoft.com

Thanks,

--Mike

re: Silverlight Tip of the Day #103 – Use Integers for Layout Calculations

malignate — Mon, 24 Aug 2009 11:55:37 GMT

Hi,

I make a silverlight jump and run game at the moment and have the same problem: http://www.gpstudio.de/JnR.png

I found your post and tried your solution, but it does not work. I also tried to add a pixel or two a scale transformation from with scaling in x and y direction of 1.01, but it has some other ugly side effects, especially at the background layer.

Do you have another idea?

Would be nice o get some tipps.

Silverlight Tip of the Day #103 – Use Integers for Layout Calculations

NewsPeeps — Sat, 08 Aug 2009 22:36:22 GMT

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re: Silverlight Tip of the Day #103 – Use Integers for Layout Calculations

DDtMM — Tue, 30 Jun 2009 06:25:26 GMT

If you check the documentation on UseLayoutRounding you'll see it is True by default... yet I've gotten results similar to the top (bad) screenshot. Maybe it is different in SL3? I haven't tried.

re: Silverlight Tip of the Day #103 – Use Integers for Layout Calculations

SharpGIS — Fri, 17 Apr 2009 17:29:37 GMT

Instead of doing all that rounding yourself, isn't this what we have UseLayoutRounding="True" for ?

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re: Silverlight Tip of the Day #102 – Use Integers for Layout Calculations

Eric Willeke — Fri, 27 Mar 2009 17:30:26 GMT

Try casting to float instead of int. I noticed in the course of doing some other work that a double value that's passed through AgCore isn't the same as went it went in. Investigation led me to realize that agcore.dll took everything in floats instead of doubles, and the difference was rounding error from the cast.

It's been a while since I explored it, but I think something like this demonstrates it... might have to use different properties:

double pi = Math.Pi;

Canvas c = new Canvas();

c.Width = pi;

double pi2 = c.Width;

Debug.Assert( pi == pi2 ); // Fails!

Debug.Assert( pi.Equals( pi2 )); // Fails!

Debug.Assert( (float) pi == (float) pi2 ); // Passes

re: Silverlight Tip of the Day #102 – Use Integers for Layout Calculations

darktatami — Fri, 27 Mar 2009 14:03:01 GMT

Awesome, I'm having a very simular issue with moving around my tile map. I'll do my calculations in ints and then change them to doubles before I move the map. Hopefully this cleans it up a bit, thanks again. :)

Silverlight Tip of the Day #102 – Use Integers for Layout Calculations

Microsoft Weblogs — Thu, 26 Mar 2009 19:29:44 GMT

When calculating the positions of objects such as Images make certain to use integer values not floating