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• What is Cloud Computing?

  - by joelvarty

  This is a question that we discuss quite often at Edentity.  It’s one of those things, kind of like “web services” where the terminology has been thrown around by a ton of people and means a lot of different things. Here’s my favorite diagram so far, which is a visual breakdown of the material presented here by NIST, visualized by the folks at Cloud Security Alliance.     What I like about this diagram is that is shows several different ways that we can differentiate our definitions of cloud computing, from the essential characteristics, or which “Broad Network Access" and “On-Demand Self-Service” (which often are used on their own to define cloud computing) are but a couple of things that help make something “cloud”. The most important section from my point of view is the middle one – the Service Models.  This represents the different ways that cloud computing can be exposed from the ground up.  It can be an Infrastructure, a Platform or a piece of Software that an end user interacts with. This is the future, folks. more late - joel

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• Inconsistent accessibility error in xna.

  - by Tom

  Hey all, you may remember me asking a question regarding a snake game I was creating about two weeks ago. Well I'm quite far now into making the game (thanks to a brilliant tutorial I found). But I've come across the error described named above. So heres my problem; I have a SnakeFood class that has a method called "Reposition". In the game1 class I have a method called "UpdateInGame" which calls the reposition method to load an orange that spawns in a random place every second. My latest piece of code changed the reposition method to allow the snake I have on the screen to not be overlapped by the orange that randomly spawns. Now I get the error (in full): Error 1 Inconsistent accessibility: parameter type 'TheMathsSnakeGame.Snake' is less accessible than method 'TheMathsSnakeGame.SnakeFood.Reposition(TheMathsSnakeGame.Snake)' C:\Users\Tom\Documents\Visual Studio 2008\Projects\TheMathsSnakeGame\TheMathsSnakeGame\SnakeFood.cs 33 21 TheMathsSnakeGame I understand what the errors trying to tell me but having changed the accessiblity of the methods, I still can't get it to work. Sorry about the longwinded question. Thanks in advance :) Edit: Code I'm using (Game1 Class) private void UpdateInGame(GameTime gameTime) { //Calls the oranges "reposition" method every second if (gameTime.TotalGameTime.Milliseconds % 1000 == 0) orange.Reposition(sidney); sidney.Update(gameTime); } (SnakeFood Class) public void Reposition(Snake snake) { do { position = new Point(rand.Next(Grid.maxHeight), rand.Next(Grid.maxWidth)); } while (snake.IsBodyOnPoint(position)); }

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• Graduated transition from Green - Yellow - Red

  - by GoldBishop

  I have am having algorithm mental block in designing a way to transition from Green to Red, as smoothly as possible with a, potentially, unknown length of time to transition. For testing purposes, i will be using 300 as my model timespan but the methodology algorithm design needs to be flexible enough to account for larger or even smaller timespans. Figured using RGB would probably be the best to transition with, but open to other color creation types, assuming its native to .Net (VB/C#). Currently i have: t = 300 x = t/2 z = 0 low = Green (0, 255, 0) mid = Yellow (255, 255, 0) high = Red (255, 0, 0) Lastly, sort of an optional piece, is to account for the possibility of the low, mid, and high color's to be flexible as well. I assume that there would need to be a check to make sure that someone isnt putting in low = (255,0,0), mid=(254,0,0), and high=(253,0,0). Outside of this anomaly, which i will handle myself based on the best approach to evaluate a color. Question: What would be the best approach to do the transition from low to mid and then from mid to high? What would be some potential pitfalls of implementing this type of design, if any?

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• Great Example of a Simple Cost-Benefit Analysis

  - by BuckWoody

  I saw a post the other day that you should definitely go check out. It’s a cost/benefit decision, and although the author gives it a quick treatment and doesn’t take all points in the decision into account, you should focus on the process he follows. It’s a quick and simple example of the kind of thought process we should have as data professionals when we pick a server, a process, or application and even platform software. The key is to include more than just the price of a piece of software or hardware. You need to think about the “other” costs in the decision, and then make the right one. Sometimes the cheapest option is the cheapest, and other times, well, it isn’t. I’ve seen this played out not only in the decision to go with a certain selection, but in the options or editions it comes in. You have to put all of the decision points in the analysis to come up with the right answer, and you have to be able to explain your logic to your team and your company. This is the way you become a data professional, not just a DBA. You can check out the post here – it deals with Azure, but the point is the process, not Azure itself: http://blogs.msdn.com/eugeniop/archive/2010/03/19/windows-azure-guidance-a-simplistic-economic-analysis-of-a-expense-migration.aspx Share this post: email it! | bookmark it! | digg it! | reddit! | kick it! | live it!

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• What are the boundaries of the product owner in scrum?

  - by Saeed Neamati

  In another question, I asked about why I feel scrum turns active developers into passive developers, and it seems that the overall problem is not scrumy (related to scrum), and rather it's related to the bad implementation of scrum. So, here I have some questions about the scope of the responsibilities of PO (product owner) and the limitations he/she shouldn't pass. Should PO interfere the UI design, when there are designers at work in scrum team? (an example of this which has happened to us, is to replace checkboxes with a drop down list with two items, namely, yes and no; or to make some boxes larger, or to left-align some content instead of centering them on the page, or stuff like that). If yeah, to what extent? Colors? Layout? Should PO interfere in Design and architecture of coding? This hasn't happened to us yet, but I'm really curious about the boundaries. For example does PO has the right to change the platform (moving from ASP.NET MVC to PHP, or something like that), or choosing the count of servers (tier architecture), etc. Should PO interfere in validation mechanisms? For example, this field should be required, or we don't need to get this piece of information from user. Sometimes, analyzers and designers confirm that something can be handled behind the scene, like extracting the user profile info from another source, instead of asking for it in UI. How granular could/should PO get into the analysis and design? For example, a user story might be: "As a customer, I'd like to be able to buy new domains online". However, scrum team can implement this user story in a wizard of five steps, or in one single page. To which level PO should monitor, or govern, or supervise the technical analysis, design, and implementation? I asked these questions to judge whether our implementation is right or wrong?

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• Customizing the NUnit GUI for data-driven testing

  - by rwong

  My test project consists of a set of input data files which is fed into a piece of legacy third-party software. Since the input data files for this software are difficult to construct (not something that can be done intentionally), I am not going to add new input data files. Each input data file will be subject to a set of "test functions". Some of the test functions can be invoked independently. Other test functions represent the stages of a sequential operation - if an earlier stage fails, the subsequent stages do not need to be executed. I have experimented with the NUnit parametrized test case (TestCaseAttribute and TestCaseSourceAttribute), passing in the list of data files as test cases. I am generally satisfied with the the ability to select the input data for testing. However, I would like to see if it is possible to customize its GUI's tree structure, so that the "test functions" become the children of the "input data". For example: File #1 CheckFileTypeTest GetFileTopLevelStructureTest CompleteProcessTest StageOneTest StageTwoTest StageThreeTest File #2 CheckFileTypeTest GetFileTopLevelStructureTest CompleteProcessTest StageOneTest StageTwoTest StageThreeTest This will be useful for identifying the stage that failed during the processing of a particular input file. Is there any tips and tricks that will enable the new tree layout? Do I need to customize NUnit to get this layout?

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• C++11 Tidbits: access control under SFINAE conditions

  - by Paolo Carlini

  Lately I have been spending quite a bit of time on the SFINAE ("Substitution failure is not an error") features of C++, fixing and tweaking various bits of the GCC implementation. An important missing piece was the implementation of the resolution of DR 1170 which, in a nutshell, mandates that access checking is done as part of the substitution process. Consider: class C { typedef int type; }; template <class T, class = typename T::type> auto f(int) - char; template <class> auto f(...) -> char (&)[2]; static_assert (sizeof(f<C>(0)) == 2, "Ouch"); According to the resolution, the static_assert should not fire, and the snippet should compile successfully. The reason being that the first f overload must be removed from the candidate set because C::type is private to C. On the other hand, before the resolution of DR 1170, the expected behavior was for the first overload to remain in the candidate set, win over the second one, to eventually lead to an access control error (*). GCC mainline (would be 4.8) finally implements the DR, thus benefiting the many modern programming techniques heavily exploiting SFINAE, among which certainly the GNU C++ runtime library itself, which relies on it for the internals of <type_traits> and in several other places. Note that the resolution of the DR is active even in C++98 mode, not just in C++11 mode, because it turned out that the traditional behavior, as implemented in GCC, wasn't fully consistent in all the possible circumstances. (*) In practice, GCC didn't really implement this, the static_assert triggered instead.

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• Clear edged sprite

  - by Ananth

  I am a newbie to cocos2d. I would like make user to draw similar to what a painting brush would do. I am using CCSprite for that. I almost implemented the velocity, color and opacity factors for that tool, but I couldn't get the Sprite to be as clear as it should be. I can draw only in the below image http://i.imgur.com/KBe0L.png which has blunt edges. But I want it to be harder / clear outside edges as in http://i.stack.imgur.com/GrFlv.png. I am getting no idea to make it clear edged. The piece of code Im using is glEnable(GL_BLEND); [brush.texture setAliasTexParameters]; [brush setBlendFunc:(ccBlendFunc){GL_ONE, GL_ONE_MINUS_SRC_ALPHA}]; [brush visit]; I suspect the problem would be on blending mode. I tried some blending modes, but with no expected results. I am trying this for the past five days and so confused. Can some one help me sort this out? Thanks in advance.

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• Friday Tips #5

  - by Chris Kawalek

  Happy Friday, everyone! Following up on yesterday's post about Oracle VM VirtualBox being selected as the best virtualization solution for 2012 by the readers of Linux Journal, our Friday tip is about that very cool piece of software: Question: How do I move a VM from one machine to another with Oracle VM VirtualBox? Answer by Andy Hall, Product Management Director, Oracle Desktop Virtualization: There are a number of ways to do this, with pros and cons for each. The most reliable approach is to Export and Import virtual machines: From the VirtualBox manager, simply use the File…Export appliance menu and follow the wizard's lead. Move the resulting file(s) to the destination machine; and Import the VM into VirtualBox. This method will take longer and use more disk space than other methods because the configuration files and virtual hard drives are converted into an industry standard format (.ova or .ovf). But an advantage of this approach is that the creator of the virtual appliance can add a license which the importer will see and click-to-accept at import time. This is especially useful for ISVs looking to deliver pre-built, configured and tested appliances to their customers and prospects. Thanks Andy! Remember, if you have a question for us, use Twitter hashtag #AskOracleVirtualization. We'll see you next week! -Chris 

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• Updating large icon in iTunes Connect

  - by Shaggy Frog

  Just wanted to see if I understand properly how/when one can change the "Large icon" for their iOS app in iTunes Connect. Questions are in bold below. To start, first the facts (as I gather) from version 6.6 of the iTC guide (March 2, 2011): The Large Icon is a "locked" piece of version information "You will only be permitted to edit Locked version information when your app is in an Editable state" The "Editable" states are: Prepare For Upload Waiting For Upload Waiting For Review Waiting For Export Compliance Upload Received Rejected Developer Rejected Invalid Binary Missing Screenshot Am I missing anything up until this point? If not, then am I correct to say that the only time I can change an app's Large Icon is when I update the application? Here's a more specific use case: My app is currently on sale, version 2.0 I have version 2.1 ready, and I want the update to coincide with a sale, so I also put a "SALE" banner on top of my large icon (what most devs are doing) I have to upload this "SALE" Large Icon when I upload the binary. If I wait until it's been reviewed, it's too late, and I'll have developer-reject the binary so I can fix it. Is this correct? Say I want the sale to last a week. So at the end of that week, I'll want to switch my Large Icon back to the pre-"SALE" version. Will I necessarily have to upload a new binary at that time? (Also posted on the Developer Forums, but it's getting no love there...)

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• Who spotted the omission?

  - by olaf.heimburger

  In my entry OFM 11g: Install OAM 10.1.4.3 (32-bit) on 64-bit RedHat AS 5 I explained how to install OAM 10.1.4.3 (32-bit) on 64-bit RedHat. This is great and works. If you seriously want to use OAM 10.1.4.3 you should consider OHS 11g 32-bit. But this installation is a bit tricky. Nearly all tricks to get this done are described in the above mentioned entry. Today I realized that I missed a small bit to get the installation successfully done.The missing part is within the script to create a vital piece of the OHS 11g package. This part is called genclientsh and resides in $OHS_HOME/bin. This script uses gcc to link binaries. By default this script works great, but on a 64-bit Linux it fails. To get around this, find the variable LD and change the value of gcc to gcc -m32.Done. Caveat On support.oracle.com you will find a Note that suggests to build a small shell script named gcc and includes the -m32 switch. Actually, I consider this as dangerous, because we are humans and tend to forget things quickly. Building a globally available script that changes things for a single setup has side effects that will result in unpredictable results.

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• How do you name/brand software?

  - by JasCav

  I am working on an application that is brand new. We have been using an internal name up to this point, but it's not very imaginative and is definitely not good from a branding standpoint. I have been tasked to come up with a name for the software. I am really struggling with this as every name I have thought about really doesn't seem to do the software justice. I have tried acronyms, mythology names, scientific names, etc. I may be being a bit picky, but I feel like the name should just hit me when its right. Here are my requirements: The name has to be easy to say (and hopefully catchy). The name has to relate back to what the software does. The name has to be able to be branded. (For example, vivid imagery, tagline, etc.) So, although I can't give the specifics of the software, I was hoping the brains here could provide some insight as to how I should go about naming/branding a piece of software?

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• Modded Portal Gun Levitates a Companion Cube [Video]

  - by Jason Fitzpatrick

  This cleverly designed Portal gun prop levitates a model Companion Cube; the whole setup just begs to be paired with a Halloween costume. Courtesy of Caleb over at Hack A Day: I was out to lunch with a couple friends, brainstorming ideas for fun projects when one of them says “Wouldn’t it be cool if we could build a working gravity gun?”. We all immediately concurred that while it would in fact be cool, it is also a silly proposition. However, only a few seconds later, I realized we could do a display piece that emulated this concept very easily. Floating magnetic globes have been around for quite some time. I determined I would tear the guts out of a stock floating globe and mount it on a portal gun, since they’re easier to find than a gravity gun. I would also build a custom companion cube to be the correct size and weight necessary. Watch the video above and then check out the link below for more information on the build. HTG Explains: What is the Windows Page File and Should You Disable It? How To Get a Better Wireless Signal and Reduce Wireless Network Interference How To Troubleshoot Internet Connection Problems

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• One-week release cycle: how do I make this feasible?

  - by Arkaaito

  At my company (3-yr-old web industry startup), we have frequent problems with the product team saying "aaaah this is a crisis patch it now!" (doesn't everybody?) This has an impact on the productivity (and morale) of engineering staff, self included. Management has spent some time thinking about how to reduce the frequency of these same-day requests and has come up with the solution that we are going to have a release every week. (Previously we'd been doing one every two weeks, which usually slipped by a couple of days or so.) There are 13 developers and 6 local / 9 offshore testers; the theory is that only 4 developers (and all testers) will work on even-numbered releases, unless a piece of work comes up that really requires some specific expertise from one of the other devs. Each cycle will contain two days of dev work and two days of QA work (plus 1 day of scoping / triage / ...). My questions are: (a) Does anyone have experience with this length of release cycle? (b) Has anyone heard of this length of release cycle even being attempted? (c) If (a) or (b), how on Earth do you make it work? (Any pitfalls to avoid, etc., are also appreciated.) (d) How can we minimize the damage if this effort fails?

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• Why would accessing photos over a network be a problem for Digikam?

  - by Shedeki

  Digikam has always worked nicely for me. I recently setup a Synology DiskStation (DS212+) and moved all my pictures to it, keeping them in an encrypted folder. I mount that folder using cifs, as some bug prevents eCryptfs and NFS from working together. This has led Digikam to being incredibly slow. Startup takes a very long time (several minutes for 41779 items, 123.8GB) but worse is how long it takes Digikam to write files. I like using Digikams import feature to copy new images from my camera to the hard drive because it checks for duplicates as well as creating a clear folder structure according to the dates the images were taken. Since I moved to using the network drive Digikam takes about 5 to 10 times as long to import photos than it did before. Saving modified or converted images takes equally long. What I am looking for is a way to help Digikam speed things up or an alternative piece of software (I have never liked Digikam being so very much KDEish…). There are just so many features that only Digikam seems to combine, e.g.: Batch processing. Respects existing folder structure. Does not mess up files for other applications. *.NEF support. Caches thumbnails in a clean way.

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• Software design of a browser-based strategic MMO game

  - by Mehran

  I wonder if there are any known tested software designs for Travian-like browser-based strategic MMO games? I mean how would they implement the server of such games or what is stored in database and what is stored in RAM? Is the state of the world stored in one piece or is it distributed among a number of storage? Does anyone know a resource to study the problems and solutions of creating such games? [UPDATE] Suggested in comments, I'm going to give an example how would I design such a project. Even though I'm not sure if I'm proposing the right one. Having stored the world state in a MongoDB, I would implement an event collection in which all the changes to the world will register. Changes that are meant to happen in the future will come with an action date set to the future and those that are to be carried out immediately will be set to now. Having this datastore as the central point of the system, players will issue their actions as events inserted in datastore. At the other end of the system, I'll have a constant-running software taking out events out of the datastore which are due to be carried out and not done yet. Executing an event means apply some update on the world's state and thus the datastore. As scalable as this design sounds, I'm not sure if it will be worth implementing. For one, it is pointless to cache the datastore as most of updates happen once without any follow ups. For instance if you have the growth of resources in your game, you'll be updating the whole world state periodically in which case, having incorporated a cache, you are keeping the whole world in RAM (which most likely is impossible). So can someone come up with a better design?

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• Upgrading specific pieces of KDE 4.x

  - by Blind Fish

  So this is going to be one of those "is this even possible?" questions. I need to upgrade a piece of my KDE from 4.8.5 to 4.9. Specifically, I need to upgrade Gwenview from the 2.85 version in KDE 4.8.5 to 2.9 version in KDE 4.9. It seems trivial but it's actually a fairly big deal for me. I recently upgraded my Ubuntu to 12.04, and that upgraded my Gwenview to 2.8x. The issue is that the Gwenview 2.8 releases accidentally broke a feature that I rely upon very heavily. It's a known bug that was corrected in 2.9. Unfortunately, the only package available in Synaptic is 4.8.5, which contains Gwenview 2.85. To make matters worse I'm not sure that I can simply take my whole KDE to 4.9 as I am running an older Toshiba Satellite with the Intel 945GMA chipset that I was shocked managed to hold up under the weight of 12.04 as it is. Well, actually it didn't. I had to install Cairo Dock as Unity 2D was hopeless with this chipset. But anyway, I desperately need to get to Gwenview 2.9 without the potential system-wide implosion of upgrading KDE to 4.9. Possible?

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• HTTP Protocal

  I have worked with the HTTP protocal for about ten years now and I have found it to be incredibly usefull for transfering data espicaly for remote systems and regardless of the network enviroment. Prior to the existance of web services, developers use to use HTTP to screen scrap data off of web pages in order to interact with remote systems, and then process the data as they needed. I use to use the HTTPWebRequest and HTTPWebRespones classes in order to screen scrap data from various sites that had information I needed to use if no web service was avalible. This allowed me to call just about any webpage and grab all of the content on the page. Below is piece of a web spider that I build about 5-7 years ago. The spider uses the HTTP protocal to requst webpages and then parse the data that is returned.  At the time of writing the spider I wanted to create a searchable index of sites I frequented. // C# 2.0 Framework// Creating a request for a specfic webpageHttpWebRequest webreq = (HttpWebRequest)WebRequest.Create(_Url); // Storeing the response of the webrequestwebresp = (HttpWebResponse)webreq.GetResponse(); StreamReader loResponseStream = new StreamReader(webresp.GetResponseStream()); _Content = loResponseStream.ReadToEnd(); // Adjust the Encoding of Responsestring charset = "";EncodeString(ref _Content, ref charset);loResponseStream.Close(); //Parse Data from the Respone_Content = _Content.Replace("\n", "");_Head = GetTagByName("Head", _Content);_Title = GetTagByName("title", _Content);_Body = GetTagByName("body", _Content);

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• Differences when Running with OutputCache managed module under ASP.NET IIS7.x with Cache-control header

  - by Shawn Cicoria

  This post is to report some differences when using MVC or IHttpHandlers if you’re attempting to set the Cache-control : max-age or s-maxage value under IIS7.x using the HttpResponse.Cache methods. [UPDATE]: 2011-3-14 – The missing piece was calling  Response.Cache.SetSlidingExpiration(true) as follows: context.Response.Cache.SetCacheability(HttpCacheability.Public); context.Response.Cache.SetMaxAge(TimeSpan.FromMinutes(5)); context.Response.ContentType = "image/jpeg"; context.Response.Cache.SetSlidingExpiration(true);   Under IIS7.x if you us one of the following 2 methods, you will only get a Cache-ability of “public”.  public ActionResult Image2() { MemoryStream oStream = new MemoryStream(); using (Bitmap obmp = ImageUtil.RenderImage("Respone.Cache.Setxx calls", 5, DateTime.Now)) { obmp.Save(oStream, ImageFormat.Jpeg); oStream.Position = 0; Response.Cache.SetCacheability(HttpCacheability.Public); Response.Cache.SetMaxAge(TimeSpan.FromMinutes(5)); return new FileStreamResult(oStream, "image/jpeg"); } } Method 2 – which is just a plain old HttpHandler and really isn’t MVC3, but under the same MVC ASP.NET application, same result. public class image : IHttpHandler { public void ProcessRequest(HttpContext context) { using (var image = ImageUtil.RenderImage("called from IHttpHandler direct", 5, DateTime.Now)) { context.Response.Cache.SetCacheability(HttpCacheability.Public); context.Response.Cache.SetMaxAge(TimeSpan.FromMinutes(5)); context.Response.ContentType = "image/jpeg"; image.Save(context.Response.OutputStream, ImageFormat.Jpeg); } } } Using the following under MVC3 (I haven’t tried under earlier versions) will work by applying the OutputCacheAttribute to your Action: [OutputCache(Location = OutputCacheLocation.Any, Duration = 300)] public ActionResult Image1() { MemoryStream oStream = new MemoryStream(); using (Bitmap obmp = ImageUtil.RenderImage("called with OutputCacheAttribute", 5, DateTime.Now)) { obmp.Save(oStream, ImageFormat.Jpeg); oStream.Position = 0; return new FileStreamResult(oStream, "image/jpeg"); } } To remove the “OutputCache” module, you use the following in your web.config: <system.webServer> <validation validateIntegratedModeConfiguration="false"/> <modules runAllManagedModulesForAllRequests="true"> <!--<remove name="OutputCache"/>--> </modules>

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• Antenna Aligner part 1: In the beginning.

  - by Chris George

  Picture the scene, it's 9pm, I'm in my caravan (yes I know, I've heard all the jokes!) with my family and I'm trying to tune the tv by moving the aerial, retuning, moving the aerial again, retuning... 45 mins and much cursing later I succeed. Surely there must be an easier way than this? Aha, an app; there must be an app for that? So I search in the AppStore for such an app, but curiously drew a blank. Then the seeds of the idea started to grow. I can code, I work in a software house with lots of very clever people, surely I can make an app that points to the nearest digital tv transmitter! Not having looked into app development before, I investigated how one goes about making an iPhone app and was quickly greeted by a now familiar answer "Buy a mac!". That was not an option for many reasons, mostly wife related! My dreams were starting to fade until one of my colleagues pointed out that within Red Gate, the very company I work for, there was on-going development on a piece of software that would allow me to write an app using Visual Studio on a Windows machine, Nomad! Once I signed up for the beta program I got to work learning the Jquery mobile / Phonegap framework. Within a couple of hours I had written (in Visual Studio), built in the cloud (using Nomad) and published (via TestFlight) my first iPhone app onto my iPhone ! It didn't do much, but it was a step in the right direction. To be continued...

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• Inverted LACK Table Serves as a Perfect Gear Rack [DIY]

  - by Jason Fitzpatrick

  We’ve seen IKEA gear hacked to hold audio and computer gear before, but this mod adds in a simple and effective twist. LACK end tables are, conveniently, the same width as a standard server rack. This makes it super simple for DIYers to mount their gear right into the legs of the table with no modification necessary. In this case, however, Winston Smith included a clever update to the mod. Rather than leave it like a standard table, he flipped the table upside down for increased stability and a stronger connection between the legs of his improvised audio rack and the table-top-turned-floor-plate. He then finished it with a matching LACK shelf piece to serve as a turn-table stand. His gear is stored cleanly, off the floor, and in a sturdy container all for about $25–a definite bargain when it comes to storage racks. Hit up the link below for more information and pictures. LACK Rack & EXPEDIT Desktop [IKEA Hackers] HTG Explains: How Windows Uses The Task Scheduler for System Tasks HTG Explains: Why Do Hard Drives Show the Wrong Capacity in Windows? Java is Insecure and Awful, It’s Time to Disable It, and Here’s How

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• How do I create a camera?

  - by Morphex

  I am trying to create a generic camera class for a game engine, which works for different types of cameras (Orbital, GDoF, FPS), but I have no idea how to go about it. I have read about quaternions and matrices, but I do not understand how to implement it. Particularly, it seems you need "Up", "Forward" and "Right" vectors, a Quaternion for rotations, and View and Projection matrices. For example, an FPS camera only rotates around the World Y and the Right Axis of the camera; the 6DoF rotates always around its own axis, and the orbital is just translating for a set distance and making it look always at a fixed target point. The concepts are there; implementing this is not trivial for me. SharpDX seems to have has already Matrices and Quaternions implemented, but I don't know how to use them to create a camera. Can anyone point me on what am I missing, what I got wrong? I would really enjoy if you could give a tutorial, some piece of code, or just plain explanation of the concepts.

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• from MS Biology to BS Computer Science [on hold]

  - by Air Borne

  I'm Marco from Italy and I'd like to ask you a piece of advice about my career. I hold a Ms degree in Biology, I enjoyed a lot studying it and I got very good grades but I didn't know what to do with my degree in the real life. Few months ago, I began to read a book about Python programming (Introduction to Computer Science, Zelle J.) and I've great fun learning Python as a beginner, I wake up in the morning thinking about doing excersies and writing simple programs with python :) I'm also watching free lectures from MIT open courseware, and I'm feeling a certain degree of regrets for never asking myself what was computer science, since it seems to me it's a magic world. After weeks of doubts, I made a move :) I applied for a CS bachelor degree abroad, I got an interview and I'm going to start this great adventure next September. I feel incredibly excited at it, but a little bit scared too. Scared because sometimes I think I'm making a great mistake for my life restarting from a bachelor in a completely different area of study. Sometimes I hear people saying the IT market is bad, sometimes I hear other ones saying quite the opposite instead. Moreover, some colleagues of mine suggested me to try to get into Bioinformatics, instead of CS. My question is: I want to really discover if CS is for me, I mean the passion of my life. I know I'm just a beginner and I can't say nothing about it yet. What do you suggest me: CS or Bioinformatics? If I get a Bs in CS, could I get into bioinformatics without relevant experience, taking into account I have a Ms Biology degree? Any comment is appreciated, thanks in advance.

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• Antenna Aligner part 2: Finding the right direction

  - by Chris George

  Last time I managed to get "my first app(tm)" built, published and running on my iPhone. This was really cool, a piece of my code running on my very own device. Ok, so I'm easily pleased! The next challenge was actually trying to determine what it was I wanted this app to do, and how to do it. Reverting back to good old paper and pen, I started sketching out designs for the app. I knew I wanted it to get a list of transmitters, then clicking on a transmitter would display a compass type view, with an arrow pointing the right way. I figured there would not be much point in continuing until I know I could do the graphical part of the project, i.e. the rotating compass, so armed with that reasoning (plus the fact I just wanted to get on and code!), I once again dived into visual studio. Using my friend (google) I found some example code for getting the compass data from the phone using the PhoneGap framework. // onSuccess: Get the current heading // function onSuccess(heading) {    alert('Heading: ' + heading); } navigator.compass.getCurrentHeading(onSuccess, onError); Using the ripple mobile emulator this showed that it was successfully getting the compass heading. But it didn't work when uploaded to my phone. It turns out that the examples I had been looking at were for PhoneGap 1.0, and Nomad uses PhoneGap 1.4.1. In 1.4.1, getCurrentHeading provides a compass object to onSuccess, not just a numeric value, so the code now looks like // onSuccess: Get the current magnetic heading // function onSuccess(heading) {    alert('Heading: ' + heading.magneticHeading); }; navigator.compass.getCurrentHeading(onSuccess, onError); So the lesson learnt from this... read the documentation for the version you are actually using! This does, however, lead to compatibility problems with ripple as it only supports 1.0 which is a real pain. I hope that the ripple system is updated sometime soon.

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• Another Twig Improvements

  - by Ondrej Brejla

  Hi all! We are here again to intorduce you some of our new NetBeans 7.3 features. Today we'll show you some another Twig improvements. So let's start! Code Templates First feature is about Code Templates. We added some basic templates to improve your Editor experience. You will be really fast with it! If someone don't know what Code Templates are, they are piece of code (snippet) which is inserted into editor after typing its abbreviation and pressing Tab key (or another one which you define in Tools -> Options -> Editor -> Code Templates -> Expand Template on) to epxand it. All default Twig Code Templates can be found in Tools -> Options -> Editor -> Code Templates -> Twig Markup. You can add your custom templates there as well. Note: Twig Markup code templates have to be expanded inside Twig delimiters (i.e. { and }). If you try to expand them outside of delimiters, it will not work, because then you are in HTML context. If you want to add a template which will contain Twig delimiter too, you have to add it directly into Tools -> Options -> Editor -> Code Templates -> HTML/XHTML. Don't add them into Twig File, it will not work. Interpolation Coloring The second, minor, feature is, that we know how to colorize Twig Interpolation. It's a small feature, but usefull :-) And that's all for today and as usual, please test it and if you find something strange, don't hesitate to file a new issue (product php, component Twig). Thanks a lot!

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