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• Is there a good tutorial/book for creating a quiz app for iOS 5? [closed]

  - by NRUTA

  I am new to iOS development and looking to create a quiz application which will be for ipad, iphone and itouch. It will ask a question, text based, and have four possible answers. After you select an answer, the system tells you if you are right or wrong and provides an explanation. It provides the percentage of correct answers. I'm not sure how to go about creating this and wondered if anybody has read a book, seen a tutorial or could offer any advice that would explain this process? Thanks in advance for all of your help!

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• Projected trajectory of a vehicle?

  - by mac

  In the game I am developing, I have to calculate if my vehicle (1) which in the example is travelling north with a speed V, can reach its target (2). The example depict the problem from atop: There are actually two possible scenarios: V is constant (resulting in trajectory 4, an arc of a circle) or the vehicle has the capacity to accelerate/decelerate (trajectory 3, an arc of a spiral). I would like to know if there is a straightforward way to verify if the vehicle is able to reach its target (as opposed to overshooting it). I'm particularly interested in trajectory #3, as I the only thing I could think of is integrating the position of the vehicle over time. EDIT: of course the vehicle has always the capacity to steer, but the steer radius vary with its speed (think to a maximum lateral g-force). EDIT2: also notice that (as most of the vehicles in real life) there is a minimum steering radius for the in-game ones too).

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• Is it a good idea to simplify an character -driven game engine to the point it's unnecessary to learn scripting/programming ?

  - by jokoon

  I remember, and I still think, that one cannot even make a prototyped 3D game to test just simple behaviors without using gigantic tools like unity or knowing extensive C++ programming, design pattern, a decent or basic 3D engine, etc. Now I'm wondering, since I know programming, that I'm still more lucky that the ones who need to learn programming prior to know how to make something: even scripted engines such as unity are not for kids, and to my sense they tend to dictate their ways of doing things, which is not the case with engine like ogre or irrlicht. I remember toying a little with the blender game engine, it was possible to link states or something I don't remember very well. Now I'm thinking that character driven games occupies a big part of the game market. Do you think it is a good idea to make a character-controlled oriented game engine which allows only to build AI instead of anything else ?

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• Radeon HD 6290 terrible performance on a certified laptop

  - by dac

  I bought Asus K53U laptop, which is Ubuntu certified with pre-installed 11.10. The graphic card is Radeon HD 6290 but 720p playback is terrible. Even page scrolling in Firefox is very laggy. Proprietary drivers are installed by default. How is this possible, why is the laptop Ubuntu certified if the performance is poor? Any solution to this? I just did apt-get autoremove, and after that, this message came out in terminal: Error inserting vesafb (/lib/modules/3.0.0-15-generic/kernel/drivers/video/vesafb.ko): No such device Could that be the problem?

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• Finding Near-Earth Asteroids

  - by TATWORTH

  One of the puzzling aspects of hunting for Near Earth Asteroids is that more has been spent on Hollywood films about potential disasters should one hit the Earth than on finding them in the first place. While there are a number of on-going asteroid search programs, these are all Earth-based at the moment. The limitations of them are:Each telescope can only observe for a maximum average of 12 hours per day.As far as I am aware, all these programs are in the visible light only. (Once an asteroid is found, then radar tracking is possible when it is close.)Being Earth based they cannot see inside the Earth's orbit.The Asteroids being generally dark, do not show up well in visible light.A private group are proposing a radical alternative to this by orbiting an infra-red telescope in the orbit of Venus. In Infra-red, the asteroids are more readily seen. Here are some details: Source SPACE.com: All about our solar system, outer space and exploration

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• Yahoo annonce un accord avec Facebook, les deux sites renforcent leurs liens et deviennent partenair

  Yahoo annonce un accord avec Facebook, les deux sites renforcent leurs liens et deviennent partenaires Yahoo et Facebook viennent d'annoncer un rapprochement entre leurs deux sites. En effet, leurs services sont à présent liés sous certains aspects. Un internaute possédant un compte sur les deux plateformes, pourra ainsi voir des notifications relatives à ses activités sur un site, apparaitre sur l'autre. De plus, les utilisateurs de certains services proposés par Yahoo (comme Flickr ou Yahoo Answer), pourront partager plus facilement leurs données y étant hébergées avec leurs amis Facebook. Il leur sera aussi possible de mettre à jour à la fois leur profil Yahoo ainsi que leur profil Facebook en une ...

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• How to have operations with character/items on binary with concrete operations on C++?

  - by Piperoman

  I have the next problem. A item can have a lot of states: NORMAL = 0000000 DRY = 0000001 HOT = 0000010 BURNING = 0000100 WET = 0001000 COLD = 0010000 FROZEN = 0100000 POISONED= 1000000 A item can have some states at same time but not all of them Is impossible to be dry and wet at same time. If you COLD a WET item, it turns into FROZEN. If you HOT a WET item, it turns into NORMAL A item can be BURNING and POISON Etc. I have tried to set binary flags to states, and use AND to combine different states, checking before if it is possible or not to do it, or change to another status. Does there exist a concrete approach to solve this problem efficiently without having an interminable switch that checks every state with every new state? It is relatively easy to check 2 different states, but if there exists a third state it is not trivial to do.

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• Sending files via HTTP to web service

  - by Serguei Fedorov

  I am bit frustrated at the lack of information about this online. Here is the issue: I am in charge of creating a iOS application which sends sound data back and forth between the server and the app. The Audio is in small files and thus does not need to be streamed over, but rather it can be sent. Right now, I am using a TCP server I wrote to handle applications like this. However, I want to keep the system as simple as possible and writing your own server and client sockets can get a bit complex and leaves room for crashes. Overall it slows down development because I need to account for packet structure and other things. My question is, can I write an ASPX or PHP web service that lets me pass the files back and forth through GET or POST?

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• How to distribute a unique database already in production?

  - by JVerstry

  Let's assume a successful web spring application running on a MySql or PostGre kind of database. The traffic is becoming so high and the amount of data is becoming so big that a distributed dataase solution needs to be implemented. It is a scalability issue. Let's assume this application is using Hibernate and the data access layer is cleanly separated with DAO objects. What would be the best strategy to scale this database? Does anyone have hands on experience to share? Is it possible to minimize sharding code (Shard) in the application? Ideally, one should be able to add or remove databases easily. A failback solution is welcome too. I am not looking for you could go for sharding or you could go no sql kind of answers. I am looking for deeper answers from people with experience.

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• How to ask questions on the Forums

  - by TATWORTH

  Based upon answering many questions on forums such as forums.asp.net, here are some tips on getting your questions answered, once you have exhausted searching on your own. Choose a concise but meaningful title but avoid words like "urgent" Post to the correct section of the forum - some people specialise in a particular section of a given forum Make it clear that you have already made an effort to answer yourself. Summerise the environmental context of your question e.g. If using SQL then state the version e.g. SQLExpress 2008 If you need to post a code or markup sample, tidy it up by removing extraneous blank lines and set the tab spacing to 2 rather than 4. Take your time composing the question so that it is set out as clearly as possible. Remember that the majority of people providing answers do so in their own time. Be very polite and thank those that help you.

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• Improving exception handling ?

  - by n00b

  Hello, I am a newbie programmer and I recently started learning about exception handling in Java. I know what try, catch and finally blocks do, but I really need to understand how to use them well and where to handle something in the call stack... I have a project right now that involves I/O and all I'm doing is handling the exception in the lowest possible method in the call stack. I'm sure my exception handling can be improved, so I'm asking you guys how you think of exception handling? How did you guys get good at this and how can I better wrap my head around this idea?

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• "A", "an", and "the" in method and function names: What's your take?

  - by Mike Spross

  I'm sure many of us have seen method names like this at one point or another: UploadTheFileToTheServerPlease CreateATemporaryFile WriteTheRecordToTheDatabase ResetTheSystemClock That is, method names that are also grammatically-correct English sentences, and include extra words purely to make them read like prose. Personally, I'm not a huge fan of such "literal" method names, and prefer to be succint, while still being as clear as possible. To me, words like "a", "an", and "the" just look plain awkward in method names, and it makes method names needlessly long without really adding anything useful. I would prefer the following method names for the previous examples: UploadFileToServer CreateTemporaryFile WriteOutRecord ResetSystemClock In my experience, this is far more common than the other approach of writing out the lengthier names, but I have seen both styles and was curious to see what other people's thoughts were on these two approaches. So, are you in the "method names that read like prose" camp or the "method names that say what I mean but read out loud like a bad foreign-language-to-English translation" camp?

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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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• Upgrading 8.10 server to LTS

  - by user3215

  I'm in a plan to upgrade ubuntu 8.10 vbox vm servers to LTS(obviously 10.04) as 8.10 has no support. As far as I know I'll be executing the following to upgrade: apt-get install update-manager-core do-release-upgrade anybody could tell me how could I upgrade a ubuntu server from alternate iso image(Is the alternate iso image used for desktop editons the same used for servers?)? I heard it's possible to upgrade an LTS directly to another LTS and how could I do this after upgrading 8.10 to 9.04 then directly to 10.04 skipping 9.10? 8.10 servers are hosting many services/applications/databases like apache2, tomcat6, ldap, mysql, cvs... and I'm not sure that all of them work as ever after the upgrade. If there is any precautions that I've to following before upgrading, please anyone let me know(ofcourse backup and I'm not going to take backup as I will be trying this on a copy of vdi/vmdk vms) Thanks!

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• Sharing SCTP connection with multiple threads

  - by poly

  I have an application that needs to run in SCTP environment, I have a question in sharing the connection among multiple threads for packet receiving only, I've tried with the sctp_sendmsg and it worked without even locking the threads (is that been taking care of by the OS, in other words, is it thread safe to do that). I've tested many cases with the send and I can't see them out of sync. Anyway, back to the receiving, is it possible to create multiple threads and send each thread the sctp descriptor to start receiving messages? Do I need a lock here or is it ok without lock? I'm using C in linux.

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• How to determine the version and origin of proprietary drivers installed by Additional Drivers?

  - by Bribles

  How can I tell which version and from which repository the Additional Drivers tool is trying to install the fglrx graphics driver? It says that I have a different version of the driver in use. I installed the driver from maverick/restricted and apt-cache tells me it's from a regular Ubuntu mirror. The installed version is the same as the candidate version. Can I get Additional Drivers to tell me what it would install if I activated the driver through it? Is it possible Additional Drivers just assumes it's a different version since it was installed by a different process?

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• Install/upgrade ubuntu from another system

  - by Samarth Agarwal

  I have a new Laptop with latest Ubuntu preinstalled on it, its 12.04. I have another laptop with Ubuntu 10.04 on it. What I lack is a fast internet connection. I want to upgrade my Ubuntu 10 laptop to a ubuntu 12 version. How is this possible without using internet connection? Can I move/copy the installation from the new laptop to the older one? Is there a way so that the newer laptop can upgrade the older one using a usb disk or dvd/cd?

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• Need some help implementing VBO's with Frustum Culling

  - by Isracg

  i'm currently developing my first 3D game for a school project, the game world is completely inspired by minecraft (world completely made out of cubes). I'm currently seeking to improve the performance trying to implement vertex buffer objects but i'm stuck, i already have this methods implemented: Frustum culling, only drawing exposed faces and distance culling but i have the following doubts: I currently have about 2^24 cubes in my world, divided in 1024 chunks of 16*16*64 cubes, right now i'm doing immediate mode rendering, which works well with frustum culling, if i implement one VBO per chunk, do i have to update that VBO each time i move the camera (to update the frustum)? is there a performance hit with this? Can i dynamically change the size of each VBO? of do i have to make each one the biggest possible size (the chunk completely filled with objects)?. Would i have to keep each visited chunk in memory or could i efficiently remove that VBO and recreated it when needed?.

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• How to perm x from n

  - by sila

  I am writing a bet settling win forms app in c#.So, I have 6 selections, 4 of them have won. I know that using the following formula =FACT(selections)/(FACT(selections-doubles))/FACT(doubles) - taken from excel but now coded into my app and working well- I can work out how many possible doubles ie AB, AC,AD,AE, BC,BD,BE, etc need to be resolved. But what I can't figure out is how to do the acutal calculation. Ie, how can I efficiently code it so that every combination A B C D has been calculated? All my efforts thus far on paper have proved to be ugly and verbose, and I was wondering if anyone could come up with an elegant solution? Ty for all and any help.

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• Copy a Ubuntu install?

  - by Hailwood

  So short story is that I am wanting to grab my ubuntu install, back up to an external disk, delete everything from my hdd, repartition my hdd, put my ubuntu install back. Long story is. I finally got my recovery discs, so I do not need to recovery partitions, not the mention my hdd is kinda messy, So I am going to wipe it and put everything back. Thing is I don't want to have to re-install everything, I would rather just copy/paste my ubuntu install if possible. Oh, What I should also mention is that I will be dual booting windows!

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• Rendering output to arbitary quadrilateral

  - by Trainee4Life

  I want to render output on a device to an arbitary quadirlateral, i.e. project texture on to a quad. What are the possible ways I could implement it? Till now, I have investigated: Drawing textured quadrilateral - Quads look odd as they are composed of triangles, and the distortion looks odd. The issue I'm facing has been discussed here and here as well. Setting transformation on device - Need help in getting this implemented. Pixel shaders - Not able to implement the desired effect. Any help would be much appreciated.

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• How to avoid being forked into oblivion by a more powerful contributor?

  - by Den

  As recently reported here: Xamarin has forked Cocos2D-XNA, a 2D/3D game development framework, creating a cross-platform library that can be included in PCL projects. However the founder of the project that was forked says: The purpose of the MIT license is to unencumber your fair use. Not to encourage you to take software, rebrand it as your own, and then "take it in a new direction" as you say. While not illegal, it is unethical. It seems that the GitHub page of the new project doesn't even indicate that it's a fork in a typical GitHub manner, opting for an easily-removable History section instead (see bottom). So my questions are: Was Xamarin's action and the way the action was done ethical or not? Is it possible to avoid such a situation if you are a single developer or a small unfunded group of developers? I am hoping this could be either a wiki question or there will be some objective answers grounded on modern OSS ethics/philosophy.

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• Data Warehouse Workshop

  - by Davide Mauri

  I’m really really pleased to announce that it’s possible to register to the Data Warehouse Workshop that I and Thomas Kejser developed togheter.  Several months ago we decided to join forces in order to create a workshop that would contain not only the theoretical stuff, but also the experience we both have and all the best practices and lesson learned that can make the difference between a success and a failure when building a Data Warehouse. The first sheduled date is 7 February in Kista (Sweden): http://www.eventzilla.net/web/event?eventid=2138965081 and until 30th November there is the Super Early Bird to save more the 100€ (150$). The workshop will be very similar to the one I delivered at PASS Summit summit, with some extra technical stuff since it’s one hour longer. In addition to that for this first version both me and Thomas will be present, so it’s a great change  to make sure you super-charge your DW/BI project with insights that aren’t available anywhere else! If you’re into the BI field and you live in Europe, don’t miss this opportunity!

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• Freezes if desktop effects is used.

  - by munir

  I have found that using desktop effects in Ubuntu versions later than 8.10 causes the desktop to freeze after a few seconds on my PC. the command lspci -nn gave the following 00:02.0 VGA compatible controller [0300]: Intel Corporation 82945G/GZ Integrated Graphics Controller [8086:2772] (rev 02) and with lspci -k I have 00:02.0 VGA compatible controller: Intel Corporation 82945G/GZ Integrated Graphics Controller (rev 02) Kernel driver in use: i915 Kernel modules: i915 The intel graphics cards seems to have some performence issues with xorg driver. However I have not noticed any freeze in Ubuntu 8.10. There are some workarounds at https://wiki.ubuntu.com/X/Bugs/Lucidi8xxFreezes to make them work. But I can't find out what workaround should I do with my graphics controller. I have tried workaround F but it did not help. can anyone help me find a workaround for my graphics card? and is it actually possible to use desktop effect in this graphics card ?

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• Programmer logbook application?

  - by jsoldi

  I've just released my application to the public, and I'm working on an updated version, but I really think I should keep track of ALL the code changes. In case some functionality suddenly starts failing, with a history of all the changes I made it would be a lot easier to figure out where I messed it up, in case the problem wasn't already there. The ideal would be to have a super fast computer with a huge hard drive and an application that automatically saves a backup of the whole project every time I change a line in the code, with some file comparison tool that would show me every difference between any two backed up projects, but that's not really possible for now. So, do you know any application that makes it easy for a programmer to keep track of the changes made to the source code?

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