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• Bridge made out of blocks at an angle

  - by Pozzuh

  I'm having a bit of trouble with the math behind my project. I want the player to be able to select 2 points (vectors). With these 2 points a floor should be created. When these points are parallel to the x-axis it's easy, just calculate the amount of blocks needed by a simple division, loop through that amount (in x and y) and keep increasing the coordinate by the size of that block. The trouble starts when the 2 vectors aren't parallel to an axis, for example at an angle of 45 degrees. How do I handle the math behind this? If I wasn't completely clear, I made this awesome drawing in paint to demonstrate what I want to achieve. The 2 red dots would be the player selected locations. (The blocks indeed aren't square.) http://i.imgur.com/pzhFMEs.png.

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• Cannot use broadband in Kubuntu

  - by Amanz Linux

  I have 5 months of experience using ubuntu 10:10. And it is clear it is suitable for broadband use. For Kubuntu, I have thoroughly tried everything available, using the 10:10 Kubuntu CD that I have had for the last week. It is very appealing, but in the meantime I am unable to use broadband in Kubuntu. I've tried and tried, thinking that it was possible that the use of broadband in Kubuntu was the same as in Ubuntu, so I have attempted to use broadband just as I used it in ubuntu. But I have failed to successfully test the broadband. Kubuntu was much different from ubuntu. Can anyone help me solve this problem?

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• RTOS experience

  - by Subbu

  Hi, I have been working as an embedded software engineer on mostly 8 bit micro-controller firmware and desktop/mobile applications development for the past five years. My work on a WinCE project (in which I got introduced to .NET CF) was short lived. I did use core APIs for interrupt processing, peripheral communication, etc...but again, not exactly a pure RTOS environment. In order to get together more solid experience for growing more in the embedded field, I want to work more with RTOSes. Will buying an evaluation board with an RTOS and putting together a project at home be regarded as a good experience or will an online course be more useful? I am just not clear as to what will be regarded as good experience. Any suggestions or directions will greatly help me. I have a passion for the field but just a need a point in the right direction. Thanks for any help in advance. Regards, Subbu

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• Which stages of the requirements analysis process in mobile requirements engineering are the most challenging ones?

  - by user363295

  I'm doing a research on formulating a requirements analysis model as a stage of requirements engineering for mobile-application development by considering the limitations and the needs of it ( agility and etc.. .), what I'm trying to figure out is that which parts of this process (requirements analysis for mobile development) are the most challenging ones ( so i can focus more on) , and if there is any stage that u think I need to include or exclude (exp. some may think a quality plan may or may not be necessary and etc.) to make it more clear below is the list of few of the areas in which I can focus on ( by the way your suggestions can be anything out of the below list.) -Requirements specification -Prototyping -Requirements Prioritization -Focusing on quality functions

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• SEO on an existing platform

  - by Simon

  I'm given the task to increase user visits and conversions on for a recruitment website. Conversions would be interested job seekers submitting their CV. The manager would first like to increase the organic search results and optimize the website before starting with targeted campaigns. The problem is, they are using a proprietary recruitment software platform which I can barely add changes to. For example, the url's all look like dynamic url's without any semantic meaning and the markup is almost completely build automatically by that platform. I'm also confident that the lack of submitted CV's is due to a bad user experience of the website (no incentives or clear CTA to register) Besides optimizing the static texts and page titles, is there anything I can do? Thanks

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• 3D Texture Mapping (Atlas)

  - by Tim Hatch

  This is a pretty simple question. If I was to use multiple images in a single texture for a 3D cube, how would I go about re-using each vertex (having 8 total vs 24)? With a single buffer of 8 vertices, I don't see how I'd properly reuse the UV values. Any help on that? I know it's not terribly clear, but I figured it was a simple question. The 2D method is pretty easy, the next coordinates would be the same as the first (0,0 and 0,1 respectively). However, the above 3D version has me quite befuddled.

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• How You Helped Shape Java EE 7...

  - by reza_rahman

  For many of us working with the JCP for years, the commitment to transparency and openness is very clear. For others, perhaps the most visible sign to date of this high regard for grassroots level input is a survey on Java EE 7 gathered a few months ago. The survey was designed to get open feedback on a number of critical issues central to the Java EE 7 umbrella specification including what APIs to include in the standard. The survey was highly successful with a large number of high quality responses. With Java EE 7 under our belt and the horizons for Java EE 8 emerging, this is a good time to thank everyone that took the survey once again for their thoughts and let you know what the impact of your voice actually was. I've posted the details on my personal blog. I hope you are encouraged by how your input to the survey helped shape Java EE 7 and continues to shape Java EE 8. Maybe now is the time for you to get more involved :-)?

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• Q&amp;A: How do I cancel my Windows Azure Platform Introductory Special? (or any Subscription)

  - by Eric Nelson

  Short answer: Don’t! Just kidding :-) Long answer: I believe it is the same process as for other Microsoft Online Services – but I have never tried it. Hence please post a comment if you follow this successfully or not and I will amend. From http://www.microsoft.com/online/help/en-us/mocp/, search for “cancel” and you get: What I am not clear about is whether an Introductory Special is classed as a trial. Either way, the answer is to contact support and ask to cancel. I would suggest you are fully armed with details of your subscription which you can get from signing in to https://mocp.microsoftonline.com. You can contact support via a online web form at https://mocp-support.custhelp.com/ Or You can call them. The details are again on the support page http://www.microsoft.com/online/help/en-us/mocp/  In the UK you can call 0800 731 8457 or (0) 20 3027 6039 Monday – Friday 09:00 – 17:00 GMT (UTC). I hope that helps.

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• How can set up a file sharing server to allow remote access over a WAN?

  - by pst007x

  I want to set up a server to allow remote access over a WAN. The purpose is to allow people to remote connect and download specific files from a specified folder hosted on the server. Is there software available to achieve this, preferably with an interface so I can easily add and remove users, plus monitor who is connected at any time? I have looked around and only found terminal references, and not very clear how to set up. I have a service running on my Win server, but I am hoping to move from that to Ubuntu for my file sharing. I do not want people who access the server to have any local accounts or any access to any folder/files apart from authorised folders/files. Thanks

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• Proxied calls not working as expected

  - by AndyH

  I have been modifying an application to have a cleaner client/server split to allow for load splitting and resource sharing etc. Everything is written to an interface so it was easy to add a remoting layer to the interface using a proxy. Everything worked fine. The next phase was to add a caching layer to the interface and again this worked fine and speed was improved but not as much as I would have expected. On inspection it became very clear what was going on. I feel sure that this behavior has been seen many times before and there is probably a design pattern to solve the problem but it eludes me and I'm not even sure how to describe it. It is easiest explained with an example. Let's imagine the interface is interface IMyCode { List<IThing> getLots( List<String> ); IThing getOne( String id ); } The getLots() method calls getOne() and fills up the list before returning. The interface is implemented at the client which is proxied to a remoting client which then calls the remoting server which in turn calls the implementation at the server. At the client and the server layers there is also a cache. So we have :- Client interface | Client cache | Remote client | Remote server | Server cache | Server interface If we call getOne("A") at the client interface, the call is passed to the client cache which faults. This then calls the remote client which passes the call to the remote server. This then calls the server cache which also faults and so the call is eventually passed to the server interface which actually gets the IThing. In turn the server cache is filled and finally the client cache also. If getOne("A") is again called at the client interface the client cache has the data and it gets returned immediately. If a second client called getOne("B") it would fill the server cache with "B" as well as it's own client cache. Then, when the first client calls getOne("B") the client cache faults but the server cache has the data. This is all as one would expect and works well. Now lets call getLots( [ "C", "D" ] ). This works as you would expect by calling getOne() twice but there is a subtlety here. The call to getLots() cannot directly make use of the cache. Therefore the sequence is to call the client interface which in turn calls the remote client, then the remote server and eventually the server interface. This then calls getOne() to fill the list before returning. The problem is that the getOne() calls are being satisfied at the server when ideally they should be satisfied at the client. If you imagine that the client/server link is really slow then it becomes clear why the client call is more efficient than the server call once the client cache has the data. This example is contrived to illustrate the point. The more general problem is that you cannot just keep adding proxied layers to an interface and expect it to work as you would imagine. As soon as the call goes 'through' the proxy any subsequent calls are on the proxied side rather than 'self' side. Have I failed to learn or not learned something correctly? All this is implemented in Java and I haven't used EJBs. It seems that the example may be confusing. The problem is nothing to do with cache efficiencies. It is more to do with an illusion created by the use of proxies or AOP techniques in general. When you have an object whose class implements an interface there is an assumption that a call on that object might make further calls on that same object. For example, public String getInternalString() { return InetAddress.getLocalHost().toString(); } public String getString() { return getInternalString(); } If you get an object and call getString() the result depends where the code is running. If you add a remoting proxy to the class then the result could be different for calls to getString() and getInternalString() on the same object. This is because the initial call gets 'deproxied' before the actual method is called. I find this not only confusing but I wonder how I can control this behavior especially as the use of the proxy may be by a third party. The concept is fine but the practice is certainly not what I expected. Have I missed the point somewhere?

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• 2D management game [on hold]

  - by Simon Bull

  Very newbie question but I have a game idea in mind. It will be 2d and data centric, like football manager. However I am struggling to find a platform that would suit. I am an experienced line of business developer so am happy to write code, but I would like a platform that does some of the leg work for me so was avoiding OpenGL. I would also like to be able deploy to iOS, android, windows and OS X. What are the options? To be more clear, the game is not a normal platform or shooter type game, so game maker is likely to be way too basic and unity seems a little over the top (though I am not sure if the GUI options would fit?). The majority of the game is more like business screens just displaying data and having buttons to click. Are there options for this type of game (May help to look at football manager)?

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• String Formatting with concatenation or substitution

  - by Davio

  This is a question about preferences. Assume a programming language offers these two options to make a string with some variables: "Hello, my name is ". name ." and I'm ". age ." years old." StringFormat("Hello, my name is $0 and I'm $1 years old.", name, age) Which do you prefer and why? I have found myself using both without any clear reason to pick either. Considering micro-optimizations is not within the scope of this question. Localization has been mentioned as a reason to go with option #2 and I think it's a very valid reason and deserves to be mentioned here. However, would opinions differ based on aesthetic viewpoints?

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• .NET mulithreading and quad core processors

  - by w0051977

  I have a single threaded application that runs on a machine with a quad core processor. The scheduled tasks that run VB.NET forms are too slow. I am new to multi threading and parallel computing. If you have a single threaded application that runs on a server with a multi core processor then does the application only ever use one of the processors? What happens if you have multiple scheduled tasks and multiple instances are in memory at the same time? I have read this question on Stackoverflow: http://stackoverflow.com/questions/607775/how-to-write-net-applications-that-utilize-multi-core-processors, but I am still not clear.

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• Google accidentally revealed Nexus 5 phone in Android Kitkat launch video

  - by Gopinath

  Today Google officially announced KitKat as the name of the next version of Android OS(v4.4). They posted a video to showcase the unveiling of the KitKat statue at the company’s headquarters, but they accidentally revealed much more. 9to5Google spotted an unreleased Android smartphone in the video and they posted screen grabs of Googlers using it to take photos. This unreleased phone could be the next version of Google Nexus phone. Google few days ago reduced price of Nexus 4 smartphones by $100 and 8 GB version is reported out of inventory. With all these signs it seems to be clear that it is just weeks away for the launch of Google Nexus smartphone. Soon after the news of leaked smartphone spread on blogs, Google pulled Kitkat launch video to private. But few bloggers managed to save a copy of the video and uploaded to other video sharing websites. Check the embedded video

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• Backing up bind mounted folders

  - by NahsiN

  My layout is as follows. LVM Setup: /dev/VG/Documents, /dev/VG/Music, /dev/VG/Pictures, /dev/VG/Music, /dev/VG/Documents, etc.... Each of the LVMs is bind mounted to the corresponding folder name in /home/foo. For example, /home/foo/Documents bind mounted to /media/Documents (mount point of /dev/VG/Documents), etc. If I set up deja-dup to just back up my home folder, am I guaranteed that everything from my LVMs will be backed up properly? So let's say I take away my LVMs for some reason and choose to restore an earlier backup. My home folder will contain everything from the LVMs? All my docs, music, vids etc. My intuition tells me everything will be fine but it doesn't hurt to ask the the experts ;). Hope I have made myself clear. Thanks

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• How to name a method that both performs a task and returns a boolean as a status?

  - by Limbo Exile

  If there is a method bool DoStuff() { try { // doing stuff... return true; } catch (Exception ex) { return false; } } should it rather be called IsStuffDone()? Both names could be misinterpreted by the user: If the name is DoStuff() why does it return a boolean? If the name is IsStuffDone() it is not clear whether the method performs a task or only checks its result. Is there a convention for this case? Or an alternative approach, as this one is considered flawed? For example in languages that have output parameters, like C#, a boolean status variable could be passed to the method as one and the method's return type would be void.

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• What are MPEG I, P and B frames?

  - by Fasih Khatib

  I was recently going over MPEG articles and videos to understand how it works. I understand what I, P and B frames do but I do not understand how the prediction is calculated. Assume that I want to record a video of a ball falling from the sky to the ground and then bouncing a couple of times before finally coming to a halt. Also, I am not clear with the concept of the 16x16 macroblock. Please tell me: how prediction is calulated what is macroblock and how it helps in MPEG encoding My references: MPEG Prediction Video on MPEG conversion

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• What functional language is most suited to create games with?

  - by Ricket

  I have had my eye on functional programming languages for a while, but am hesitating to actually get into them. But I think it's about time I at least starting glancing that direction to make sure I'm ready for anything. I've seen talk of Haskell, F#, Scala, and so on. But I have no clue the differences between the languages and their communities, nor do I particularly care; except in the context of game development. So, from a game development standpoint, which functional programming language has the most features suited for game programming? For example, are there any functional game development libraries/engines/frameworks or graphics engines for functional languages? Is there a language that handles certain data structures which are commonly used in game development better? Bottom line: what functional programming language is best for functional game programming, and why? I believe/hope this question will declare a clear best language therefore I haven't marked it CW despite its subjective tendency.

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• Is imposing the same code format for all developers a good idea?

  - by Stijn Geukens

  We are considering to impose a single standard code format in our project (auto format with save actions in Eclipse). The reason is that currently there is a big difference in the code formats used by several (10) developers which makes it harder for one developer to work on the code of another developer. The same Java file sometimes uses 3 different formats. So I believe the advantage is clear (readability = productivity) but would it be a good idea to impose this? And if not, why? UPDATE We all use Eclipse and everyone is aware of the plan. There already is a code format used by most but it is not enforced since some prefer to stick to their own code format. Because of the above reasons some would prefer to enforce it.

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• Keep only essential packages

  - by Stijn

  In an attempt to learn more about Ubuntu and its packages, I want to remove all non-essential packages, so I can install what I need, when I need them and know what they do. I'm using the commands dpkg --clear-selections and apt-get dselect-upgrade for this. I also slightly modify the selection by setting apt libstdc++6 (due to apt) install-info (due to grep) to install again (somehow dpkg thinks they are not essential, but apt-get complains). Is this ok, or is this bad? If it's ok, what do I do with the large list of packages with "deinstall" status in dpkg? An additional note, I'm doing this on a VPS template so I have no control over the initially installed packages.

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• How to increase the amount of steps of brightness adjustment-key

  - by Koen

  The screen of my laptop (Dell Vostro 3460) supports 16 levels of brightness: Not only according to the manufacturer, but also as is clear from two OSs: Both Windows 7 and Ubuntu (dual-booted) support all levels. On Windows 7, the hotkeys for brightness adjustment support all levels. In ubuntu it is apparent when going on the brightness slidebar (see picture below) from left to right; I can count 16 different levels of brightness when doing so. When using the hotkeys (Fn+F4 and Fn+F4), however, only 5 levels are supported. How can I adjust these levels and make them in line with what my screen supports?

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• LightView: JavaFX 2 real-time visualizer for GlassFish

  - by arungupta

  Adam Bien launched LightFish, a light-weight monitoring and visualization application for GlassFish. It comes with a introduction and a screencast to get you started. The tool provides monitoring information about threads and memory (such as heap size, thread count, peak thread count), transactions (commits and rollbacks), HTTP sessions, JDBC sessions, and even "paranormal activity". In a recently released first part of a tri-part article series at OTN, Adam explains how REST services can be exposed as bindable set of properties for JavaFX. The article titled "Enterprise side of JavaFX" shows how a practical combination of REST and JavaFX together. It explains how read-only and dynamic properties can be created. The fine-grained binding model allows clear separation of the view, presentation, and business logic. Read the first part here.

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• How do I make Unity quit opening Firefox under the Shiretoko icon?

  - by Azendale

  I'm using Ubuntu 12.04, and whenever I open Firefox, whether it is from searching on the dash or clicking a 'quick-launch' launcher, it always opens yet another icon for the running instance that is a blank page and says Shiretoko. It will pulse the Firefox icon for a while (I'm guessing until a timeout or something). It's as if Unity no longer recognizes the Firefox process as Firefox and misidentifies it as Shiretoko. (I know Shiretoko was a testing version of Firefox a long time ago.) How do I set Unity straight? I imagine that it has something to do with me once using Shiretoko, but I believe that was even on a different installation, just the same home folder. Is there some place Unity caches this information that I can clear (or remove specific parts of)?

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• Salting a public hash

  - by Sathvik

  Does it make any sense at all to salt a hash which might be available publicly? It doesn't really make sense to me, but does anyone actually do that? UPDATE - Some more info: An acquaintance of mine has a common salted-hash function which he uses throughout his code. So I was wondering if it made any sense at-all, to do so. Here's the function he used: hashlib.sha256(string+SALT).hexdigest() Update2: Sorry if it wasn't clear. By available publicly I meant, that it is rendered in the HTML of the project (for linking, etc) & can thus be easily read by a third party. The project is a python based web-app which involves user-created pages which are tracked using their hashes like myproject.com/hash so thus revealing the hash publicly. So my question is, whether in any circumstances would any sane programmer salt such a hash? Question: Using hashlib.sha256(string+SALT).hexdigest() vs hashlib.sha256(string).hexdigest() , when the hash isn't a secret.

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• New website, plans to go large. How do you protect yourself?

  - by John Redyns

  I'm planning to create a new site that (in hopes) will make it to a decent state of popularity and use. I have made sites before, but they weren't serious, with any intended purpose other than personal and friend use. I've never been able to find a solid post on good steps to protecting yourself, and your site/idea before you start. This site will always be free, and will not be bringing it any revenue by ads or whatnot, but I plan to in the future and would want to make I'm in the clear legally for one. Do you need to copyright anything? Or anything of the same concept as copyright? Do I make an LLC to operate it under? Apologies for this extremely poorly written question, basically I want to be both legal, and I want to make sure nobody can just rip my idea or name(s). (I'm sure this will be more concise as questions here are asked) Thanks

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