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• Silverlight Cream for March 20, 2010 -- #815

  - by Dave Campbell

  In this Issue: Andy Beaulieu(-2-, -3-), Alex Golesh, Damian Schenkelman, Adam Kinney(-2-), Jeremy Likness, Laurent Bugnion, and John Papa. Shoutouts: Adam Kinney has a good summary up of where to go for all the tools and toys: Install checklist for Silverlight 4 RC, Blend 4 Beta and Windows Phone Developer tools from MIX10 ... tons of links Laurent Bugnion had a few announcements at MIX10: MVVM Light V3 released at #MIX10, and he followed that with What’s new in MVVM Light V3 ... now for Windows Phone! Laurent Bugnion also has announced Sample code for my #mix10 talk online From SilverlightCream.com: Physics Games in Silverlight on Windows Phone 7 Andy Beaulieu has the Physics Helper working for WP7 already... read his post, check out all the links and get going on something fun... was great seeing you at MIX, too, Andy! Silverlight 4: GPU Accelerated PlaneProjection Andy Beaulieu has a comparison up of Plane Projection with and without the new GPU acceleration... be sure to read his notes section. Silverlight 4 PathListBox for Motion Path Animation Have you heard of the PathListBox? Well, showing is better than telling, so check out Andy Beaulieu's post on it Silverlight at Windows Phone 7 Alex Golesh has a quick overview on developing a Windows Phone 7 app in Silverlight using the new toys, and executiting it in the emulator Prism v2.1: Creating a Region Adapter for the Accordion control Damian Schenkelman shows how to use the Accordian control from the toolkit as a region in a Prism app. Expression Blend 4 Beta Feature Overview available for download Adam Kinney announced the presence of an Expression Blend whitepaper as well... you should go grab that too .toolbox – Free online Silverlight and Expression Blend training Want to improve your Silverlight chops or gain some Expression Blend chops? Check out .toolbox post that Adam Kinney posted Introducing the Visual State Aggregator Jeremy Likness describes the basic panel A/panel B problem, describes ways he and other folks have flipped between them, then describes his Visual State Aggregator ... and it's downloadable for you to give it a dance! Multithreading in Windows Phone 7 emulator: A bug Laurent Bugnion found a bug wit multi-threading on the Windows Phone emulator. He confirmed this with the team, and has a workaround you'll be needing... thanks Laurent. Silverlight Overview - Technical Whitepaper John Papa has reiterated the existence of this Silverlight 4 whitepaper ... it was updated this week, and we all should be aware of it. Stay in the 'Light! Twitter SilverlightNews | Twitter WynApse | WynApse.com | Tagged Posts | SilverlightCream Join me @ SilverlightCream | Phoenix Silverlight User Group Technorati Tags: Silverlight    Silverlight 3    Silverlight 4    Windows Phone MIX10

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• How do I fix dependency problems with the kernel in apt?

  - by Jon

  When trying to install new packages, either manually or with muon, I get these errors: jon@jon-desktop:~/Apps/mendeleydesktop-1.5-dev4-linux-x86_64/bin$ sudo apt-get install kupfer [sudo] password for jon: Reading package lists... Done Building dependency tree Reading state information... Done You might want to run 'apt-get -f install' to correct these: The following packages have unmet dependencies: kupfer : Depends: python-keybinder but it is not going to be installed Recommends: python-wnck but it is not going to be installed linux-headers-generic : Depends: linux-headers-3.2.0-20-generic but it is not installable linux-image-generic : Depends: linux-image-3.2.0-20-generic but it is not installable E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution). jon@jon-desktop:~/Apps/mendeleydesktop-1.5-dev4-linux-x86_64/bin$ sudo apt-get -f install Reading package lists... Done Building dependency tree Reading state information... Done Correcting dependencies... Done The following extra packages will be installed: linux-generic linux-headers-generic linux-image-generic The following packages will be upgraded: linux-generic linux-headers-generic linux-image-generic 3 upgraded, 0 newly installed, 0 to remove and 2 not upgraded. 3 not fully installed or removed. Need to get 0 B/6,658 B of archives. After this operation, 0 B of additional disk space will be used. Do you want to continue [Y/n]? dpkg: dependency problems prevent configuration of linux-image-generic: linux-image-generic depends on linux-image-3.2.0-20-generic; however: Package linux-image-3.2.0-20-generic is not installed. dpkg: error processing linux-image-generic (--configure): dependency problems - leaving unconfigured No apport report written because the error message indicates its a followup error from a previous failure. dpkg: dependency problems prevent configuration of linux-generic: linux-generic depends on linux-image-generic (= 3.2.0.20.22); however: Package linux-image-generic is not configured yet. dpkg: error processing linux-generic (--configure): dependency problems - leaving unconfigured No apport report written because the error message indicates its a followup error from a previous failure. dpkg: dependency problems prevent configuration of linux-headers-generic: linux-headers-generic depends on linux-headers-3.2.0-20-generic; however: Package linux-headers-3.2.0-20-generic is not installed. dpkg: error processing linux-headers-generic (--configure): dependency problems - leaving unconfigured No apport report written because the error message indicates its a followup error from a previous failure. Errors were encountered while processing: linux-image-generic linux-generic linux-headers-generic E: Sub-process /usr/bin/dpkg returned an error code (1) As indicated above, I ran sudo apt-get -f install but it still tells me there are dependency issues.

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• GDC 2012: The Bleeding Edge of Open Web Tech

  GDC 2012: The Bleeding Edge of Open Web Tech (Pre-recorded GDC content) Web browsers from mobile to desktop devices are in a constant state of growth enabling ever richer and pervasive games. This presentation by Google software engineer Vincent Scheib focuses on the latest developments in client side web technologies, such as Web Sockets, WebGL, File API, Mouse Lock, Gamepads, Web Audio API and more. Speaker: Vincent Scheib From: GoogleDevelopers Views: 1279 31 ratings Time: 48:33 More in Science & Technology

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• Multi-Threaded Application vs. Single Threaded Application

  Why would we use a multi threaded application vs. a single threaded application? First we must define multithreading. Multithreading is a feature of an operating system that allows programs to run subcomponents or threads in parallel. Typically most applications only need to use one thread because they do not perform time consuming tasks. The use of multiple threads allows an application to distribute long running tasks so that they can be executed in parallel. This gives the user the perceived appearance that the application is working faster due to the fact that while one thread is waiting on an IO process the remaining tasks can make use of the available CPU. The allows working threads to execute in tandem so that they can be competed sooner. Multithreading Benefits Improved responsiveness — Users usually report improved responsiveness compared to single thread applications. Faster applications — Multiple threads can lead to improved application performance. Prioritization — Threads can be assigned a priority which would allow higher priority tasks to take precedence over lower priority tasks. Single Threading Benefits Programming and debugging —These activities are easier compared to multithreaded applications due to the reduced complexity Less Overhead — Threads add overhead to an application When developing multi-threaded applications, the following must be considered. Deadlocks occur when two threads hold a monitor that the other one requires. In essence each task is blocking the other and both tasks are waiting for the other monitor to be released. This forces an application to hang or deadlock. Resource allocation is used to prevent deadlocks because the system determines if approving the resource request will render the system in an unsafe state. An unsafe state could result in a deadlock. The system only approves requests that will lead to safe states. Thread Synchronization is used when multiple threads use the same instance of an object. The threads accessing the object can then be locked and then synchronized so that each task can interact with the static object on at a time.

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• Minimal set of critical database operations

  - by Juan Carlos Coto

  In designing the data layer code for an application, I'm trying to determine if there is a minimal set of database operations (both single and combined) that are essential for proper application function (i.e. the database is left in an expected state after every data access call). Is there a way to determine the minimal set of database operations (functions, transactions, etc.) that are critical for an application to function correctly? How do I find it? Thanks very much!

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• SQL Server v.Next (Denali) : Troubleshooting Error 18456

  - by AaronBertrand

  I think we've all dealt with error 18456, whether it be an application unable to access SQL Server, credentials changing over time, or a user who can't type a password correctly. The trick to troubleshooting this error number is that the error message returned to the client or application trying to connect is intentionally vague (the error message is similar for most errors, and the state is always 1). In a few cases, some additional information is included, but for the most part several of these...(read more)

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• Five Things To Which SQL Server Should Say "Goodbye and Good Riddance"

  - by Adam Machanic

  I was tagged by master blogger Aaron Bertrand and asked to identify five things that should be removed from SQL Server. Easy enough, or so I thought... 1) Tempdb . But I should qualify that a bit. Tempdb is absolutely necessary for SQL Server to properly function, but in its current state is easily the number one bottleneck in the majority of SQL Server instances. Many other DBMS vendors abandoned the "monolithic, instance-scoped temporary data space" years ago, yet SQL Server soldiers on, putting...(read more)

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• Detecting wins in peer to peer RTS games like Starcraft

  - by user782220

  A typical RTS game is implemented with the standard networking model: peer to peer lockstep. Consider Starcraft 2, given that Battle.net presumably doesn't know anything about the state of game given that there is only communication between the two players in a peer to peer model, how does Battle.net know who was the winner in the end. Relying on the two peers to not try to cheat and report accurate results is naive.

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• Daily tech links for .net and related technologies - Mar 23-25, 2010

  - by SanjeevAgarwal

  Daily tech links for .net and related technologies - Mar 23-25, 2010 Web Development Introducing Browsers Providers in ASP.NET 4 - osbornm ASP.NET 4.0 Part 14, More Control Over Session State - hmobius Editable MVC Routes (Apache Style) - nberardi ASP.NET Performance Framework - karlseguin Web Design Techniques for Squeezing Images for All They’re Worth - Walter 12 Useful and Free Downloadable Web Design Books - SpeckyBoy Getting Started with Xcode IDE for iPhone Development - keyvan Grid Accordion...(read more)

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• Cannot install stable Xbox 360 driver

  - by Mohd Arafat Hossain

  When I type in sudo add-apt-repository ppa:grumbel/ppa sudo apt-get update sudo apt-get install xboxdrv then when I go to install the stable driver like this sudo apt-get install xboxdrv-stable I get this mohd-arafat-hossain@TUD:~$ sudo apt-get install xboxdrv-stable [sudo] password for the-ubuntu-documentary: Reading package lists... Done Building dependency tree Reading state information... Done E: Unable to locate package xboxdrv-stable

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• SQL Developer: Why Do You Require Semicolons When Executing SQL in the Worksheet?

  - by thatjeffsmith

  There are many database tools out there that support Oracle database. Oracle SQL Developer just happens to be the one that is produced and shipped by the same folks that bring you the database product. Several other 3rd party tools out there allow you to have a collection of SQL statements in their editor and execute them without requiring a statement delimiter (usually a semicolon.) Let’s look at a quick example: select * from scott.emp select * from hr.employees delete from HR_COPY.BEER where HR_COPY.BEER.STATE like '%West Virginia% In some tools, you can simply place your cursor on say the 2nd statement and ask to execute that statement. The tool assumes that the blank line between it and the next statement, a DELETE, serves as a statement delimiter. This is not bad in and of itself. However, it is very important to understand how your tools work. If you were to try the same trick by running the delete statement, it would empty my entire BEER table instead of just trimming out the breweries from my home state. SQL Developer only executes what you ask it to execute You can paste this same code into SQL Developer and run it without problems and without having to add semicolons to your statements. Highlight what you want executed, and hit Ctrl-Enter If you don’t highlight the text, here’s what you’ll see: See the statement at the cursor vs what SQL Developer actually executed? The parser looks for a query and keeps going until the statement is terminated with a semicolon – UNLESS it’s highlighted, then it assumes you only want to execute what is highlighted. In both cases you are being explicit with what is being sent to the database. Again, there’s not necessarily a ‘right’ or ‘wrong’ debate here. What you need to be aware of is the differences and to learn new workflows if you are moving from other database tools to Oracle SQL Developer. I say, when in doubt, back away from the tool, especially if you’re in production. Oh, and to answer the original question… Because we’re trying to emulate SQL*Plus behavior. You end statements in SQL*Plus with delimiters, and the default delimiter is a semicolon.

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• Chunking a List - .NET vs Python

  - by Abhijeet Patel

  Chunking a List As I mentioned last time, I'm knee deep in python these days. I come from a statically typed background so it's definitely a mental adjustment. List comprehensions is BIG in Python and having worked with a few of them I can see why. Let's say we need to chunk a list into sublists of a specified size. Here is how we'd do it in C#  static class Extensions   {       public static IEnumerable<List<T>> Chunk<T>(this List<T> l, int chunkSize)       {           if (chunkSize <0)           {               throw new ArgumentException("chunkSize cannot be negative", "chunkSize");           }           for (int i = 0; i < l.Count; i += chunkSize)           {               yield return new List<T>(l.Skip(i).Take(chunkSize));           }       }    }    static void Main(string[] args)  {           var l = new List<string> { "a", "b", "c", "d", "e", "f","g" };             foreach (var list in l.Chunk(7))           {               string str = list.Aggregate((s1, s2) => s1 + "," + s2);               Console.WriteLine(str);           }   }   A little wordy but still pretty concise thanks to LINQ.We skip the iteration number plus chunkSize elements and yield out a new List of chunkSize elements on each iteration. The python implementation is a bit more terse. def chunkIterable(iter, chunkSize):      '''Chunks an iterable         object into a list of the specified chunkSize     '''        assert hasattr(iter, "__iter__"), "iter is not an iterable"      for i in xrange(0, len(iter), chunkSize):          yield iter[i:i + chunkSize]    if __name__ == '__main__':      l = ['a', 'b', 'c', 'd', 'e', 'f']      generator = chunkIterable(l,2)      try:          while(1):              print generator.next()      except StopIteration:          pass   xrange generates elements in the specified range taking in a seed and returning a generator. which can be used in a for loop(much like using a C# iterator in a foreach loop) Since chunkIterable has a yield statement, it turns this method into a generator as well. iter[i:i + chunkSize] essentially slices the list based on the current iteration index and chunksize and creates a new list that we yield out to the caller one at a time. A generator much like an iterator is a state machine and each subsequent call to it remembers the state at which the last call left off and resumes execution from that point. The caveat to keep in mind is that since variables are not explicitly typed we need to ensure that the object passed in is iterable using hasattr(iter, "__iter__").This way we can perform chunking on any object which is an "iterable", very similar to accepting an IEnumerable in the .NET land

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• How to prevent ‘Select *’ : The elegant way

  - by Dave Ballantyne

  I’ve been doing a lot of work with the “Microsoft SQL Server 2012 Transact-SQL Language Service” recently, see my post here and article here for more details on its use and some uses. An obvious use is to interrogate sql scripts to enforce our coding standards.  In the SQL world a no-brainer is SELECT *,  all apologies must now be given to Jorge Segarra and his post “How To Prevent SELECT * The Evil Way” as this is a blatant rip-off IMO, the only true way to check for this particular evilness is to parse the SQL as if we were SQL Server itself.  The parser mentioned above is ,pretty much, the best tool for doing this.  So without further ado lets have a look at a powershell script that does exactly that : cls #Load the assembly [System.Reflection.Assembly]::LoadWithPartialName("Microsoft.SqlServer.Management.SqlParser") | Out-Null $ParseOptions = New-Object Microsoft.SqlServer.Management.SqlParser.Parser.ParseOptions $ParseOptions.BatchSeparator = 'GO' #Create the object $Parser = new-object Microsoft.SqlServer.Management.SqlParser.Parser.Scanner($ParseOptions) $SqlArr = Get-Content "C:\scripts\myscript.sql" $Sql = "" foreach($Line in $SqlArr){ $Sql+=$Line $Sql+="`r`n" } $Parser.SetSource($Sql,0) $Token=[Microsoft.SqlServer.Management.SqlParser.Parser.Tokens]::TOKEN_SET $IsEndOfBatch = $false $IsMatched = $false $IsExecAutoParamHelp = $false $Batch = "" $BatchStart =0 $Start=0 $End=0 $State=0 $SelectColumns=@(); $InSelect = $false $InWith = $false; while(($Token = $Parser.GetNext([ref]$State ,[ref]$Start, [ref]$End, [ref]$IsMatched, [ref]$IsExecAutoParamHelp ))-ne [Microsoft.SqlServer.Management.SqlParser.Parser.Tokens]::EOF) { $Str = $Sql.Substring($Start,($End-$Start)+1) try{ ($TokenPrs =[Microsoft.SqlServer.Management.SqlParser.Parser.Tokens]$Token) | Out-Null #Write-Host $TokenPrs if($TokenPrs -eq [Microsoft.SqlServer.Management.SqlParser.Parser.Tokens]::TOKEN_SELECT){ $InSelect =$true $SelectColumns+="" } if($TokenPrs -eq [Microsoft.SqlServer.Management.SqlParser.Parser.Tokens]::TOKEN_FROM){ $InSelect =$false #Write-Host $SelectColumns -BackgroundColor Red foreach($Col in $SelectColumns){ if($Col.EndsWith("*")){ Write-Host "select * is not allowed" exit } } $SelectColumns =@() } }catch{ #$Error $TokenPrs = $null } if($InSelect -and $TokenPrs -ne [Microsoft.SqlServer.Management.SqlParser.Parser.Tokens]::TOKEN_SELECT){ if($Str -eq ","){ $SelectColumns+="" }else{ $SelectColumns[$SelectColumns.Length-1]+=$Str } } } OK, im not going to pretend that its the prettiest of powershell scripts,  but if our parsed script file “C:\Scripts\MyScript.SQL” contains SELECT * then “select * is not allowed” will be written to the host.  So, where can this go wrong ?  It cant ,or at least shouldn’t , go wrong, but it is lacking in functionality.  IMO, Select * should be allowed in CTEs, views and Inline table valued functions at least and as it stands they will be reported upon. Anyway, it is a start and is more reliable that other methods.

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• "Unable to locate package" errors for all software

  - by Mohammad Hosain Safari

  My apt-get doesn't install any programs. I try to install programs with apt-get install but always it shows same error: unable to locate package. For example I try to install the xbmc media center; here's what happens: $ sudo apt-get install xbmc Reading package lists... Done Building dependency tree Reading state information... Done E: Unable to locate package xbmc I have updated my package list with sudo apt-get update.

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• Connected Systems (SOA) QuickStart Materials

  - by Rajesh Charagandla

  The Connected Systems (SOA) QuickStart includes a comprehensive set of technical content including presentations, whitepapers and demos that are designed to present to customers to assess the current state of their Service Oriented Architecture (SOA) and integration capabilities and understand how a Microsoft solution built using products such as BizTalk Server can help address their SOA and integration needs. This QuickStart includes delivery materials, self-paced training materials and supplementary materials.   Download from the Material from here

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• High Performance Storage Systems for SQL Server

  Rod Colledge turns his pessimistic mindset to storage systems, and describes the best way to configure the storage systems of SQL Servers for both performance and reliability. Even Rod gets a glint in his eye when he then goes on to describe the dazzling speed of solid-state storage, though he is quick to identify the risks.

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• Generate DROP statements for all extended properties

  - by jamiet

  This evening I have been attempting to migrate an existing on-premise database to SQL Azure using the wizard that is built-in to SQL Server Management Studio (SSMS). When I did so I received the following error: The following objects are not supported = [MS_Description] = Extended Property Evidently databases containing extended properties can not be migrated using this particular wizard so I set about removing all of the extended properties – unfortunately there were over a thousand of them so I needed a better way than simply deleting each and every one of them manually. I found a couple of resources online that went some way toward this: Drop all extended properties in a MSSQL database by Angelo Hongens Modifying and deleting extended properties by Adam Aspin Unfortunately neither provided a script that exactly suited my needs. Angelo’s covered extended properties on tables and columns however I had other objects that had extended properties on them. Adam’s looked more complete but when I ran it I got an error: Msg 468, Level 16, State 9, Line 78 Cannot resolve the collation conflict between "Latin1_General_100_CS_AS" and "Latin1_General_CI_AS" in the equal to operation. So, both great resources but I wasn’t able to use either on their own to get rid of all of my extended properties. Hence, I combined the excellent work that Angelo and Adam had provided in order to manufacture my own script which did successfully manage to generate calls to sp_dropextendedproperty for all of my extended properties. If you think you might be able to make use of such a script then feel free to download it from https://skydrive.live.com/redir.aspx?cid=550f681dad532637&resid=550F681DAD532637!16707&parid=550F681DAD532637!16706&authkey=!APxPIQCatzC7BQ8. This script will remove extended properties on tables, columns, check constraints, default constraints, views, sprocs, foreign keys, primary keys, table triggers, UDF parameters, sproc parameters, databases, schemas, database files and filegroups. If you have any object types with extended properties on them that are not in that list then consult Adam’s aforementioned article – it should prove very useful. I repeat here the message that I have placed at the top of the script: /* This script will generate calls to sp_dropextendedproperty for every extended property that exists in your database. Actually, a caveat: I don't promise that it will catch each and every extended property that exists, but I'm confident it will catch most of them! It is based on this: http://blog.hongens.nl/2010/02/25/drop-all-extended-properties-in-a-mssql-database/ by Angelo Hongens. Also had lots of help from this: http://www.sqlservercentral.com/articles/Metadata/72609/ by Adam Aspin Adam actually provides a script at that link to do something very similar but when I ran it I got an error: Msg 468, Level 16, State 9, Line 78 Cannot resolve the collation conflict between "Latin1_General_100_CS_AS" and "Latin1_General_CI_AS" in the equal to operation. So I put together this version instead. Use at your own risk. Jamie Thomson 2012-03-25 */ Hope this is useful to someone! @Jamiet

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• Cannot install ia32-libs

  - by Marcos Junior

  I don't know why I can't install ia32-libs. It claims for a dependency that cannot be found on repos. junior@mediacenter:~$ sudo apt-get install ia32-libs Reading package lists... Done Building dependency tree Reading state information... Done Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation: The following packages have unmet dependencies: ia32-libs : Depends: ia32-libs-multiarch E: Unable to correct problems, you have held broken packages. junior@mediacenter:~$ sudo apt-get install ia32-libs-multiarch Reading package lists... Done Building dependency tree Reading state information... Done Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation: The following packages have unmet dependencies: ia32-libs-multiarch:i386 : Depends: gstreamer0.10-plugins-good:i386 but it is not going to be installed Depends: gtk2-engines:i386 but it is not going to be installed Depends: gtk2-engines-murrine:i386 but it is not going to be installed Depends: gtk2-engines-pixbuf:i386 but it is not going to be installed Depends: gtk2-engines-oxygen:i386 but it is not going to be installed Depends: ibus-gtk:i386 but it is not going to be installed Depends: libcanberra-gtk-module:i386 but it is not going to be installed Depends: libcurl3:i386 but it is not going to be installed Depends: libgail-common:i386 but it is not going to be installed Depends: libglapi-mesa:i386 but it is not going to be installed Depends: libglu1-mesa:i386 but it is not going to be installed Depends: libgtk2.0-0:i386 but it is not going to be installed Depends: libqt4-opengl:i386 but it is not going to be installed Depends: librsvg2-common:i386 but it is not going to be installed Recommends: libgl1-mesa-glx:i386 but it is not going to be installed Recommends: libgl1-mesa-dri:i386 but it is not going to be installed E: Unable to correct problems, you have held broken packages. Running ubuntu Precise: junior@mediacenter:~$ uname -a Linux mediacenter 3.2.0-24-generic #37-Ubuntu SMP Wed Apr 25 08:43:22 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux Synaptic fix broken package does nothing. Any tips?? Thanks I need this package to install other apps like teamviewer7.

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• ntpd server always in 'INIT' mode

  - by Deepak

  I'm running ntpd server in my ubuntu (10.04) machine. But it is always stays in the 'INIT' state as shown below. lyra@ws07475:~$ ntpq -p remote refid st t when poll reach delay offset jitter ============================================================================== europium.canoni .INIT. 16 u - 1024 0 0.000 0.000 0.000 lyra@ws07475:~$ Of course, this means that it is not keeping time. How can I start 'ntpd' server properly ? Please help.

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• jquery image slider for jquery mobile website

  - by Kaidul Islam Sazal

  I have found a fancy looking cubic jquery image slider for jquery mobile website here: http://m.jeep.com/en/mobile/vehicles/selector.html?app=bmo#&ui-state=dialog Now I want to use this slider in one of my project.But I didn't found any resource of this kind of slider for mobile website in online.Now I need to know if there are this kind of slider on the internet ? Or do you know any useful resource of image slider for mobile site (I didn't find any effective resource).

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• Separating physics and game logic from UI code

  - by futlib

  I'm working on a simple block-based puzzle game. The game play consists pretty much of moving blocks around in the game area, so it's a trivial physics simulation. My implementation, however, is in my opinion far from ideal and I'm wondering if you can give me any pointers on how to do it better. I've split the code up into two areas: Game logic and UI, as I did with a lot of puzzle games: The game logic is responsible for the general rules of the game (e.g. the formal rule system in chess) The UI displays the game area and pieces (e.g. chess board and pieces) and is responsible for animations (e.g. animated movement of chess pieces) The game logic represents the game state as a logical grid, where each unit is one cell's width/height on the grid. So for a grid of width 6, you can move a block of width 2 four times until it collides with the boundary. The UI takes this grid, and draws it by converting logical sizes into pixel sizes (that is, multiplies it by a constant). However, since the game has hardly any game logic, my game logic layer [1] doesn't have much to do except collision detection. Here's how it works: Player starts to drag a piece UI asks game logic for the legal movement area of that piece and lets the player drag it within that area Player lets go of a piece UI snaps the piece to the grid (so that it is at a valid logical position) UI tells game logic the new logical position (via mutator methods, which I'd rather avoid) I'm not quite happy with that: I'm writing unit tests for my game logic layer, but not the UI, and it turned out all the tricky code is in the UI: Stopping the piece from colliding with others or the boundary and snapping it to the grid. I don't like the fact that the UI tells the game logic about the new state, I would rather have it call a movePieceLeft() method or something like that, as in my other games, but I didn't get far with that approach, because the game logic knows nothing about the dragging and snapping that's possible in the UI. I think the best thing to do would be to get rid of my game logic layer and implement a physics layer instead. I've got a few questions regarding that: Is such a physics layer common, or is it more typical to have the game logic layer do this? Would the snapping to grid and piece dragging code belong to the UI or the physics layer? Would such a physics layer typically work with pixel sizes or with some kind of logical unit, like my game logic layer? I've seen event-based collision detection in a game's code base once, that is, the player would just drag the piece, the UI would render that obediently and notify the physics system, and the physics system would call a onCollision() method on the piece once a collision is detected. What is more common? This approach or asking for the legal movement area first? [1] layer is probably not the right word for what I mean, but subsystem sounds overblown and class is misguiding, because each layer can consist of several classes.

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• What is causing my spacebar to randomly stop working?

  - by Chris Billington

  A couple of times a day, I'll be typing something and realise I can't type spaces. Usually the cursor will flicker instead when I press the spacebar, and I can type all other letters as far as I can tell. If I'm in a terminal the cursor turns from a solid square to an empty square until I release the spacebar. For some reason, restarting compiz with alt-F2 compiz fixes it, until it next occurs. I can still copy and paste spaces from sources that already have them, and I can still insert spaces with ctrl-shift-u, 20, enter. This has been happening for a while, since before I upgraded to maverick, but it feels like its beceoming more frequent. There really doesn't seem to be any kind of a pattern to it. I'm using 64 bit ubuntu 10.10 on a system76 panp7 laptop. Any ideas how I might troubleshoot? EDIT: using xev, normally a spacebar registers as: KeyPress event, serial 36, synthetic NO, window 0x5600001, root 0x101, subw 0x0, time 26488647, (88,403), root:(748,458), state 0x10, keycode 65 (keysym 0x20, space), same_screen YES, XLookupString gives 1 bytes: (20) " " XmbLookupString gives 1 bytes: (20) " " XFilterEvent returns: False KeyRelease event, serial 36, synthetic NO, window 0x5600001, root 0x101, subw 0x0, time 26488729, (88,403), root:(748,458), state 0x10, keycode 65 (keysym 0x20, space), same_screen YES, XLookupString gives 1 bytes: (20) " " XFilterEvent returns: False But when it's stopped behaving a press of the spacebar instead gives the three events: FocusOut event, serial 36, synthetic NO, window 0x5600001, mode NotifyGrab, detail NotifyAncestor FocusIn event, serial 36, synthetic NO, window 0x5600001, mode NotifyUngrab, detail NotifyAncestor KeymapNotify event, serial 36, synthetic NO, window 0x0, keys: 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 FURTHER EDIT: Ok, so I think I've solved the problem, and by that I mean I now know which package to file a bug against. I have a hot corner which initiates a window picker, and I've customised the window picking so that left click goes to a window, right click closes one and spacebar zooms in on one. When I go to this hot corner, compiz must take control of my spacebar, and clearly isn't giving it back when I leave the window picker. So I'll be filing a bug against compiz. reported:here

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• How might one teach OO without referencing physical real-world objects?

  - by hal10001

  I remember reading somewhere that the original concepts behind OO were to find a better architecture for handling the messaging of data between multiple systems in a way that protected the state of that data. Now that is probably a poor paraphrase, but it made me wonder if there is a way of teaching OO without the (Bike, Car, Person, etc.) object analogies, and that instead focuses on the messaging aspects. If you have articles, links, books, etc., that would be helpful.

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• Install Everpad on Ubuntu 13.10

  - by Muhammad Ahmad Zafar

  I just installed a fresh copy of Ubuntu 13.10 and wanted to install Everpad but there is some issue as the PPA for it is missing it. These were the commands which I execute (took help from http://www.webupd8.org/2012/09/everpad-integrates-evernote-with-ubuntu.html and everywhere its the same): sudo add-apt-repository ppa:nvbn-rm/ppa sudo apt-get update sudo apt-get install everpad The following which what I get when the last command is executed: Reading package lists... Done Building dependency tree Reading state information... Done E: Unable to locate package everpad Please help

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• Installing Canon LBP6000 in Ubuntu 12.04

  - by MMA

  This is really frustrating. I am trying to install LBP6000 in Ubuntu 12.04 without any success. (Well, I had success about a week back when I first bought the printer and finally printed pages after a struggle of several hours. Then today it suddenly stopped working and I uninstalled everything and started from scratch. Now, I seem to have lost the way.) My steps Downloaded the latest Canon driver from Canon site. File Linux_CAPT_PrinterDriver_V240_uk_EN.tar.gz Got the radu script (I am allowed only two hyperlinks, so can not put the link here. You can Google radu Canon) Changed the /etc/modprobe.d/blacklist-cups-usblp.conf file as instructed in, Official Documentation. (See the section Ubuntu 12.04 Install). Now this file looks like, # cups talks to the raw USB devices, so we need to blacklist usblp to avoid # grabbing them # blacklist usblp Rebooted my machine Changed the port in radu script to 59787 as instructed in the link at step 3. (Again see the section Ubuntu 12.04 Install, or see the comment at How to Install Canon LBP Printers in Ubuntu. Also put the latest deb files from step 1 in the appropriate directory of this script. Ran the radu script. A printer, LBP6000 got added. Not two printers, one to be disabled, as appeared in the message on the terminal after running the script. sudo /etc/init.d/ccpd status shows, Canon Printer Daemon for CUPS: ccpd: 3142 3139 Results The printer does not print. Printer state (from System Setting-Printing, or at cups http interface localhost:631/printers/LBP6000) goes from Idle to Processing, a job appears in print queue, and then the job disappears and the printer state goes back to Idle. The actual printer does not even blink. Diagnostics (got help from the link in step 3, Troubleshooting) captstatusui -P LBP6000 shows communication error lsmod | grep usblp did not show anything. After running, sudo modprobe usblp, shows usblp 17885 0 However, ls -l /dev/usb/lp0 gives, ls: cannot access /dev/usb/lp0: No such file or directory /var/ccpd did not exist, created, sudo mkdir /var/ccpd sudo mkfifo /var/ccpd/fifo0 sudo chown -R lp:lp /var/ccpd Any suggestion will be appreciated. Do not know what to do.

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