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• SAT and then what?

  - by Marek

  I am on my way to make another Arkanoid game but this time I decided that I want it a little bit more realistic than just checking intersections between AABB and inverting one vector's component on collision. So I found SAT but I don't know how can I change direction of the ball in realistic matter. Maybe I'm wrong but it seems like knowing MTV doesn't give me much. So my question is what algorithms should I use to make it realistic? I also care about possibility of spinning ball with a pallet. I don't know how to do it exactly but I guess I will need to consider acceleration of the pallet.

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• Why is implementing copy-paste in a touch screen based smartphone such a big deal?

  - by EpsilonVector

  I'm not entirely sure this is on-topic, but it definitely needs a programmer's understanding to be answered, and deals with general development (for a specific scenario) as opposed to a specific piece of code. In a way it also translates into "what are the challenges in doing X in a touch screen app", and similar questions have been asked here in the past. So here it is: When Apple didn't implement copy-pasting on the iPhone since version 1 I just assumed it was a UI issue- they were waiting until they figured out a good UI for it. But now the idea is out there, and Microsoft still released Windows Phone 7 without copy-pasting, promising it'll be ready in a few months. My question is: why does this takes a few months to implement? Are there some technological challenges that are unique to programming for a touch screen that I'm not familiar with?

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• If you had three months to learn one relatively new technology, which one would you choose?

  - by Ivo van der Wijk

  This question was taken from CodingHorror. On my list would be (and some actually are): Android Development (and possibly iPhone development) Go language and its concurrency NoSQL, specifically CouchDB RCTK, which happens to be my own idea / project (but all ideas have been thought or already, what matters is my implementation) But I don't think I'm being cutting-edge/thinking-outside-the-box here. What's on your list? Please don't restrict yourself to the list above - that's my list. I'm interested in hearing what others find interesting new technology.

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• What makes game sound effects "good"?

  - by you786

  I'm making a small game, and I've found some free sound effects that I'd like to use. The issue is that I can't get the sound effects to sound like they "belong" in my game. I don't know what to look for that can make sound effects match the rest of my game style. I have some ideas on what affects the meshing of audio with graphics. For example, I have a feeling that the current SFX I may be too "realistic" for my graphical style, which is pretty cartoon-like. Also, is there a golden standard for what volume various SFX should be at? (for example, I am thinking that footsteps or other common sounds should be at barely audible volumes, while enemy deaths or something that is a "big deal" should be louder). I found a similar question about graphics, I'm looking for a similar response with sound effects.

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• Serverside memory efficiency and threading for a turn based game

  - by SkeletorFromEterenia

  Im programming on a turn based war-game for some years now (along with the engine) and Im having quite a hard time at figuring out what the games server architecture should look like, since most game server architecture articles I found focus either on FPS oder MMOGs, which doesn't really fit since I want many matches with 1- 16 players on my server, with each match being played in turn based mode. My chief concern is memory usage, since the most basic approach of loading every game that is being played completely into RAM should be quite inefficient, so is there a suitable strategy for selecting only the needed bits and loading them? Another question I got is how to design the threading on the server, since I think using only a single thread could be a problem due to the fact that the game or part of it might have to be loaded from the database. I would be very happy if you could share your knowledge or point me to material on this topic.

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• Why are so many DBCC commands undocumented?

  - by DBA

  Paul Randal of SQLskills.com does a great job of answering the question of why there are so many undocumented DBCC commands in his post Why are so many DBCC commands undocumented? I would like to go on to say that not only does this apply to the DBCC commands but is some respect to all parts of SQL, other Servers, IDE's, Operating Systems, just about everywhere. There is always something that just does not make it into the official documentation. And as Paul points out probably never will make it. That could be why there are so many "Tips & Tricks" types of books, blog post, etc. everywhere you look. And I also agree with Janos's comments on Paul's post, which was "I'm fine with them undocumented. All of us who need to use these commands know where to find "documentation" and whom to ask ". Till later,

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• What happens at control invoke function?

  - by user65909

  A question about form controls invoke function. Control1 is created on thread1. If you want to update something in Control1 from thread2 you must do something like: delegate void SetTextCallback(string txt); void setText(string txt) { if (this.textBox1.InvokeRequired) { SetTextCallback d = new SetTextCallback(setText); this.Invoke(d, new object[] { txt }); } else { // this will run on thread1 even when called from thread2 this.textBox1.AppendText(msg); } }` What happens behind the scenes here? This invoke behaves different from a normal object invoke. When you want to call a function in an object on a specific thread, then that thread must be waiting on some queue of delegates, and execute the incoming delegates. Is it correct that the windows forms control invoke function is completely different from the standard object invoke function?

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• Is true multithreading really necessary?

  - by Jonathan Graef

  So yeah, I'm creating a programming language. And the language allows multiple threads. But, all threads are synchronized with a global interpreter lock, which means only one thread is allowed to execute at a time. The only way to get the threads to switch off is to explicitly tell the current thread to wait, which allows another thread to execute. Parallel processing is of course possible by spawning multiple processes, but the variables and objects in one process cannot be accessed from another. However the language does have a fairly efficient IPC interface for communicating between processes. My question is: Would there ever be a reason to have multiple, unsynchronized threads within a single process (thus circumventing the GIL)? Why not just put thread.wait() statements in key positions in the program logic (presuming thread.wait() isn't a CPU hog, of course)? I understand that certain other languages that use a GIL have processor scheduling issues (cough Python), but they have all been resolved.

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• How to play .mp4 movies?

  - by Andrew

  I have a .mp4 movie (it's an .mp4 file, and the "video codec" is Xvid, and the "audio codec" is mp3) that I want to play, but when I try to open it in MPlayer, it says "The steam is encrypted and decryption is not supported." I tried to apply the answer from this question and this wiki page, but neither worked. Any suggestions? The file came from an [apparently] less than reputable site, which I guess I can't link to. :( I've tried: sudo apt-get install ubuntu-restricted-extras sudo apt-get install libdvdread4 sudo /usr/share/doc/libdvdread4/install-css.sh sudo apt-get install gstreamer0.10-ffmpeg sudo apt-get install w64codecs sudo apt-get update

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• When should I use AtomPub?

  - by Gary Rowe

  I have been conducting some research into RESTful web service design and I've reached what I think is a key decision point so I thought I'd offer it up to the community to get some advice. In keeping with the principles of a RESTful architecture I want to present a discoverable API, so I will be supporting the various HTTP verbs as fully as possible. My difficulty comes with the choice of representation of those resources. You see, it would be easy for me to come up with my own API that covers how search results are to be presented and how links to other resources are provided, but this would be unique to my application. I've read about the Atom Publishing Protocol (RFC 5023), and how OData promotes its use, but it seems to add an extra level of abstraction over what is (currently) a rather simple API. So my question is, when should a developer select AtomPub as their choice of representation - if at all? And if not, what is the current recommended approach?

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• An application asks to unlock the keyring on startup, but it doesn't say which one

  - by Idan K

  A couple of weeks ago a popup has appeared whenever I startup telling me that an application wants to access the keyring but it doesn't say which one. I'm used to seeing the application name on the popup but here it just says 'application'. I haven't changed any passwords or did anything that might have something to do with that, to my knowledge. I saw this question but like I said, I haven't changed any of my passwords, and I don't want my keyring password to be empty. How can I find out which application is asking to unlock to keyring and fix it?

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• Is it possible to calculate or mathematically prove if a game is balanced / fair?

  - by Lurca

  This question is not focussed on video games but games in general. I went to a boardgame trade fair yesterday and asked myself if there is a way to calculate the fairness of a game. Sure, some of them require a good portion of luck, but it might be possible to calculate if some character is overpowered. Especially in role-playing games and trading card games. How, for example, can the creators of "Magic: The Gathering" make sure that there isn't the "one card that beats them all", given the impressive number of available cards?

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• Ubuntu has LTS and normal version now. Does Lubuntu have the same?

  - by Elysium

  I am wondering if this is the right place for this question, but if not...then the moderators will surely tell me so. Anyway....there is Ubuntu 12.04 LTS and the normal 12.10 version. Is that the same with Lubuntu? On their site, for some reason, they seem to be promoting the 12.10 version while for me an LTS is always more appealing. I am wondering if they have the same ideology as the Ubuntu team. UPDATE: Is it okay to talk about Lubuntu here at all? I understand that it is a flavour of Ubuntu...but still. Are they 2 very different teams?

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• How To Specify Bitrate, Codec and Demultiplexing for VLC Video Capture or Recording

  - by Subhash

  I capture video from old TV tuner card - Pinnacle PCTV - using VLC. The video is from the Composite input and audio is from I guess the mixer or Line in. The command I use is: vlc v4l2:///dev/video0:normal=pal:width=720:height=576:input=1 :input-slave="alsa://hw:0,0" In VLC, I have enabled the Advanced Controls toolbar, which allows me to record videos when I want to. However, these videos are uncompressed - very big and play only with VLC. Totem throws the "Could not demultiplex stream" error. I need to convert them using WinFF to reduce their size and make them playable with Totem and other software. My question is whether I can configure the recording settings - the codecs and the bitrate, and also get the stream demultiplexed. If I pass any -sout parameter with command I get a "Segmentation fault". I use 64-bit Ubuntu 10.10.

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• How often do CPUs make calculation errors?

  - by veryfoolish

  In Dijkstra's Notes on Structured Programming he talks a lot about the provability of computer programs as abstract entities. As a corollary, he remarks how testing isn't enough. E.g., he points out the fact that it would be impossible to test a multiplication function f(x,y) = x*y for any large values of x and y across the entire ranges of x and y. My question concerns his misc. remarks on "lousy hardware". I know the essay was written in the 1970s when computer hardware was less reliable, but computers still aren't perfect, so they must make calculation mistakes sometimes. Does anybody know how often this happens or if there are any statistics on this?

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• Why is a # sign added to the end of URLS?

  - by Niro

  Note: I'm asking this from the perspective of the site developers (trying to help someone there). not as a user. Please don't forward this to superuser.com. It's a server admin question. Have a look here http://www.wanimo.com/fr/chiens/coussin-matelas-tapis-pour-chien-sc28/tapis-plat-urban-chic-sf7263/ you'll see that the page gets redirected to the same page with # at the end. Worse, when you click back you get garbage url. I'm trying to debug what is causing the redirect. Any advice on how to find it ?

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• structure problem in Relational DBMS creation

  - by Kane

  For learning and understanding purpose, I currently want to try to make a small relational DBMS with simple features like (for now) only sequential reading/writing and CREATE TABLE, INSERT, SELECT, UPDATE and DELETE management. I am currently on the "think" part of the project and I am stuck on the way to store the read data in memory. First I was thinking of putting them properly on a structure, but the problem is that tables are all different, know the type of each column is not an issue, but I am not sure C provide a way to make fully dynamic structure. My second and current idea is to make a simple char array of the required length and just get the data by order with cast. But I am not sure if it is the good way to do that part, so I wanted to ask for your opinion and advices about that. Thanks in advance for your help. nb: I hope my question is enough clear and understandable, I still lack of pratice in english

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• Multiple domain with one host - SEO pov

  - by Swing Magic

  Lets say i currently have mycompanyname.com domain. and after several time i found that its very hard to hit top of serp. after searching i find there is domain that match with one of my keyword. i build website with 2 language. and im able to assign both of url with different language. my question, impact with SEO? it will have a load of duplicated content between those domain (image video etc). im afraid one of my website will have marked as plagiarist because many of content will be same. anyone experience the same condition? Thank you!

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• Network icon shows an Internet connection, while ping does not

  - by mushfiq

  I am an Ubuntu user for the last couple of years. Recently facing problem to connect my new laptop into the Internet. I have an ISP connection which provide me a NAT address. I changed all the information in network configuration.The network icon shows it is connected to Internet but when I browse, ping shows no Internet connection. /etc/network/interfaces look like this: auto eth0 iface eth0 inet static address 192.168.100.118(put you internet address provided by the ISP) gateway 192.168.100.1(gateway address) netmask 255.255.255.0 network 192.168.100.0 And when I ping my DNS server IP get the reply from DNS server. I can not understand the problem,it should be mentioned that I also changed the Physical address of my laptop for using the existing connection. In windows the connection is working fine. Any suggestion in this question will help me a lot. Thanks in advance.

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• What is the equivalent word for "compile" in an interpreted language?

  - by user46874

  (I was encouraged to ask this question here.) In C, we say: GCC compiles foo.c. For interpreters (such as Lua), what is the equivalent verb? The Lua interpreter ____ foo.lua. When I write instructions for users of my Lua script, I often say: Run the interpreter on foo.lua. I think this can be said more succinctly: Interpret (or Translate) foo.lua. but that sounds awkward for some reason (perhaps because I'm unsure of its correctness). I can't really say compile because users may confuse it with the usage of the Lua compiler when I actually mean the Lua interpreter.

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• How to prevent ubuntu from connecting to wifi hotspots automatically

  - by calvin tiger

  Note: this question is distinct from "How to disable automatically connecting to WiFi?", as I do not wish to disable automatic WiFi connection in general. Problem: The Ubuntu WiFi module connects automatically in priority with WiFi networks without a password, even if there is a already known password-protected WiFi network nearby. Worse, most of the times these "unprotected" networks are in fact hotspots that require authentification from the browser. Example: I am at home, and most of the times my Ubuntu laptop will connect by itself to a nearby hotspot instead of choosing my local ADSL box (password-protected, with a password that is already known by the computer). I then have to select my own WiFi network manually. Is there a way to disable automatic connection to /all/ hotspots ?

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• Good Literature for "Object oriented programming in C"

  - by Dipan Mehta

  This is not a debate question about whether or not C is a good candidate for Object oriented programming or not. Quite often C is the primary platform where the development is happening. I have seen, and hopefully learnt through crawling many open source and commercial projects - that while the language inherently doesn't stop you if you create "non-object" code. However, you can still think in the "Object" way and reasonably write code that captures this designs thinking. For those who has done this, OO way is still the best way to write code even when you are programming in C. While, I have learnt most of it through the hard way, are there any deep literature that can help educate the relatively young guys about how to do OO programming in C?

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• Scripting with variables from file

  - by Nooster

  I have several videos on my PC that I would like to shorten. For instance I have a 30 sec video where I want to have the section from sec 15 to 20 (a 5sec video). To cut this, I use avconv. avconv -i input.mp4 -ss 15 -acodec copy -vcodec copy -t 5 output.mp4 This command works pretty well. I have many videos I want to cut the same way. This is why I created a textfile containing the information: input-name, start of cut, length of cut, output-name. Those are written into in.txt that looks like this: input.mp4 15 5 output.mp4 input1.mp4 32 10 output1.mp4 input2.mp4 10 7 output2.mp4 ... My question is: How do I have to modify the avconv-command to cut my videos automatically? What I tried was this, but it didn't work at all: avconv -i $1 -ss $2 -acodec copy -vcodec copy -t $3 $4 < in.txt Any idea?

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• What would you say to a bunch of software engineering students on their first day at college?

  - by Álvaro

  Next Friday I'm giving a short (30 min.) talk to a bunch of software engineering students who will be attending the same university I did. Some context: The place is Montevideo, Uruguay The university is Universidad de la República (public, free university) The Software Engineering programme takes 5 years (if you're very good and don't start working early). Around 800 new students per year, around 80 graduates per year. Conditions are harsh, particularly the first two years. Most of them probably have no idea what software engineering or programming is. My goal would be to somehow give them an idea of the field and hopefully motivate them to endure the hardships ahead to eventually become successful developers. So the question is: what would you tell these people?

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• Will there be a Ubuntu Serif font in the future?

  - by Ingo Gerth

  Since 10.10 we have the wonderful new Ubuntu sans serif font. If everything goes well 11.04 will bring a great looking new monospace font. It would only be a logical step to also develop a serif font! This way, the Ubuntu experience would get its definite touch. It could for example give a very special web experience as proposed and supported in this post, by covering the three major font families. Now of course the question remains, are there any plans for this?

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