Anders creates a sample grayscale BitmapEffect pixel shader for WPF 3.5 SP1 here. Check it out if you’ve considered creating one of your own (or just curious how you might do it).
He walks through all the necessary steps and provides the source code for download.
I’ve created nine technical interview questions so far as part of my ongoing series.
Just as a reminder, each question should be solvable in less than 30 minutes time (sometimes less). Some amount of coding is typically necessary to solve the problem (either actual code or pseudo-code), but occasionally, just a plan or discussion-style response is expected (although to date, they’ve all been coding questions).
Hope you’ve enjoyed the series so far. If you have any suggestions, send them my way!
Don’t forget about Visual Studio 2008’s export template functionality — a great way to easily create templates that match your needs specifically.
Steve shows off a few he has created for WCF here.
The distance between two points is …
Create a function which does the following…
Record the last 150 points (x, y) provided to the function (bonus points for allowing a configurable number of points).
Determine which of the previous points are less than a configured distance between the new point and the previous points.
There may be hundreds of new points in a second… Consider the impact of time and CPU impact for your solution.
(if your preferred programming language does not have a square root function, assume one exists.)
Someone wrote me and asked a question about using the Windows Imaging Component in C#, trying to access the various IPTC, EXIF, and XMP metadata stored within a JPG. I pointed him at an older sample project with source code using the BitmapMetadata class. Using that component, you can get access to all of the metadata stored within a JPG. It doesn’t however, make it easy to necessarily understand the data — but it does give you access.
