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  • Structure gameobjects and call events

    - by waco001
    I'm working on a 2D tile based game in which the player interacts with other game objects (chests, AI, Doors, Houses etc...). The entire map will be stored in a file which I can read. When loading the tilemap, it will find any tile with the ID that represents a gameobject and store it in a hashmap (right data structure I think?). private static HashMap<Integer, Class<GameObject>> gameObjects = new HashMap<Integer, Class<GameObject>>(); How exactly would I go about calling, and checking for events? I figure that I would just call the update, render and input methods of each gameobject using the hashmap. Should I got towards a Minecraft/Bukkit approach (sorry only example I can think of), where the user registers an event, and it gets called whenever that event happens, and where should I go as in resources to learn about that type of programming, (Java, LWJGL). Or should I just loop through the entire hashmap looking for an event that fits? Thanks waco

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  • Indexing File Contents

    - by Rafid K. Abdullah
    People seem to have already asked about indexing file system: What options are there for indexing my filesystem? Alternatives to OS X's Spotlight? but I want to actually just index a certain working directory and be able to do that manually (so that I make sure my search is correct). Basically, I am on working a project and I need be able to search in contents quickly. I already use 'locate' and 'updatedb' commands, but those search for file names only. I am looking for similar commands but file contents. Just in case you are wondering why I don't use tracker also like answered in the two posts, tracker have a set of prespecified folders to search in them, and whenever you make a search, you search in all of them. What I want is to be able to search in every project separately.

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  • How do I totally disable all forms of session management in Xubuntu?

    - by Evan Carroll
    Xubuntu remembers things like xfce-terminal and chromium whenever my system starts up. I don't want that function to happen, ever. I want every restart to be fresh. How do I disable this functionality. I've seen numerous tutorials that unchecking the "Save sessions for future logins" screen in Log Off would work, but it does't seem to work for me. When the system comes back the other applications are open. I've also deleted the files in autostart, as per this question.

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  • How to make unity unresponsive in Unity session in precise?

    - by Anwar Shah
    Recently I wanted to test the a keyboard shortcut, which is supposed to kill X server (hence very useful when you have a crash). That shortcut is not dependent on any particular window manager (like lxde, unity, kwin etc). So, it must work, even when you have unresponsive window manager (as opposed to Alt+Ctrl+Backspace which kills the session, and bring you a login screen). That's why I interested to make my WM (unity) unresponsive. Is past, it was very easy. Opening a terminal, typing unity --replace and then force close the terminal, was the simplest procedure. But unfortunately, This is not true in Ubuntu 12.04, (they make it very robust) Because whenever I kill the terminal, Unity automagically restart itself. I also tried compiz --replace but wasn't successful. My question is: How can I make Unity unresponsive while I am in Unity session, so that window manager does not recognize any keyboard shortcut.

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  • Why does waking from hibernate take nearly ten minutes on 11.10?

    - by Shane O'Connor
    Im running 11.10 64bit on a Dell XPS 15 L502x laptop. It uses an i5 proc and has 16Gb ram. Whenever I close the lid on the laptop I have it set to hibernate as I want to continue whatever I was previously running. Generally that is simple text editing, so my mem usage would normally be only a Gb or 2. When I open the lid and it resumes from Hibernation, it takes up to ten minutes to do so. Extremely frustrating. Is there anything I can do to make hibernate function properly. On windows it used to wake from Hibernation in less than 30 seconds. Its really frustrating and souring my experience with Ubuntu. Any help would be gratefully appreciated! Thanks guys/gals! S

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  • Once mounted using TrueCrypt, cannot unmount

    - by zeiger
    I have an external HDD and use TrueCrypt for keeping encrypted file containers. After mounting, whenever I try to dismount a file container (using TrueCrypt 7.0a on Ubuntu 11.04), it just does not happen and I get the following message: device-mapper: remove ioctl failed: Device or resource busy Command failed Further, if I close TrueCrypt and then try to start it again, it says that TrueCrypt is already running, but I cannot access it from the Unity sidebar (because it is not there). Also, if I power down my external HDD, the TrueCrypt volume still shows as one of the mounted volumes, but I cannot do anything with it. Any possible work around? I remember this NOT happening in earlier versions of Ubuntu so I am guessing there is something to do with 11.04. Thanks

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  • Connecting/Removing a Second Monitor with Multiple Workspaces

    - by Ben
    I am running 12.04 on a laptop. I use workspaces extensively to manage different projects. When I take my laptop home, I plug in an additional monitor. The problem I am having is that whenever I plug in the additional monitor, all of my windows, regardless of what workspace they were in before I connected the additional monitor, move to workspace 1. This forces me to go through all the windows and manually move the windows back to where I had them. I don't think adding a monitor to each workspace should cause windows to move around between workspaces. Any thoughts or ideas on how to fix this? Know of any workarounds? Thanks in advance!

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  • Why we do not use PowerConnect to access PeopleSoft Tree

    - by dylan.wan
    1. It does not allow you to use parameters to the PeopleSoft connect. It may be changed later. However, it was a big issue when we try to address customer issues. 2. It requires EFFDT as an option. It expect that people change the EFFDT using Mapping Editor. How can a business user does that every month? 3. It asks for a Tree Name. Many PeopleSoft tree structure supports multiple trees. Tree is just a header of the hierarchy. Whenever you add a new Tree, you need to create a new mapping!! It does not make sense to use PowerConnect due to the customer demands. All requirements are from customers. We have no choice but stop using it.

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  • Default file permissions for php user www-data

    - by John Isaacks
    I have a php installed on my ubuntu machine. The web root is /var/www I set the permissions for this folder like so: sudo chown -R ftpuser:www-data /var/www ftpuser is the user I set up so I can ftp to /var/www from another machine on the network. www-data is the user php uses. I double checked using whoami from php. Whenever I ftp upload a new file to the machine the group has no permissions to the file. So when I try to access it in my browser via machine-name/new-file.php I am told permission denied and I have to go and chmod the new file. I am wondering if there is a way I can default the www-data user/group to have access permissions to new files so I don't have to keep chmod every new file?

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  • What You Said: How You Organize Your Apps

    - by Jason Fitzpatrick
    Earlier this week we asked you to share your tips and tricks for keeping your apps organized and accessible; now we’re back to showcase some great reader tips to help you manage your mountain of apps. One of the trends was striving for consistency across environments. Henrique highlights how this plays out on a dual OS setup: On my windows desktop I use the taskbar and to keep my day to day applications (basically firefox, itunes, office, adobe, evernote and wunderkit), and whenever I need something else, I use windows built in search, which is quite fast, despite needing a few more clicks than spotlight would. On my macbook the dock is basically mirrors my taskbar, and I use spotlight for other applications, but launchpad is wining my heart a bit more every day. It’s faster then than accessing the applications folder and the windows start menu, and possibly even than spotlight, at least for apps How To Properly Scan a Photograph (And Get An Even Better Image) The HTG Guide to Hiding Your Data in a TrueCrypt Hidden Volume Make Your Own Windows 8 Start Button with Zero Memory Usage

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  • Eye of gnome image bug with ATI graphic driver

    - by thonixx
    I just installed the ATI driver for my Ubuntu 11.10. After some annoying bugs and errors it works for now. But there is one most stupid bug. Whenever I open a picture in the default image viewer (eye of gnome EOG) it shows me an overexposed picture. Example with EOG: http://ubuntuone.com/4tJHSINBUPjypmcV2EXUF5 Example how it should be: http://ubuntuone.com/1DnwJ1pdQKUCloBcV1kcY5 How can I fix this? Update Driver I used was 8.911-111025a-128237C-ATI with Catalyst 11.11. I installed the driver via jockey and used the driver released with Ubuntu because the post-release driver fails everytime.

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  • What collision detection approach for top down car game?

    - by nathan
    I have a quite advanced top down car game and i use masks to detect collisions. I have the actual designed track (what the player see) with fancy graphics etc. and two other pictures i use as mask for my detection collisions. Each mask has only two colors, white and black and i check each frame if a pixel of the car collide with a black pixel of the masks. This approach works of course but it's not really flexible. Whenever i want to change the look of a track, i have to redraw the mask and it's a real pain. What is the general approach for this kind of game? How can i improve the flexibility of such a mask based approach?

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  • How do I implement a score database in Android?

    - by Michael Seun Araromi
    I making a 2D game for Android using OpenGL-ES technology. It is a space shooting game where the player shoots enemy ships. I want to keep a track of score for the amount of enemy ships destroyed and a record of a local highscore. The score should be incremented whenever an enemy is destroyed. I also want a way of displaying both the current score and highscore on the game screen. I am not familiar with databases at all and I will appreciate a clear answer or a link to a good tutorial for my cause. Thanks.

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  • Why can I only put some items in the launcher?

    - by HaskellElephant
    Whenever I search for an item using dash it knows the default way of opening it. However if I drag a file into the launcher it can't be added, even if it is executable. For example if you would like minecraft to show up you will have to add a custom launcher, or if you use dash to find a pdf file, you can double click it and it opens evince however you cannot drag it into the launcher. The animation surrounding this behavior suggests that this was done by design. Why is this useful or necessary? Is it a bug?

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  • What would be the best approach to make revisions of user content?

    - by Kevin Simper
    I have searched and could not find any information about it. What is the best approach to storing revisions? I have a website where the user can write a document which can be fairly long (200-300 lines). How do you determine when to make a revision? Is it not a scalable solution to make a new one whenever the save, because that would be useless to the user when the want to look back, and it would require quite a lot of space. You could use time and say for every 15 minute they are working on it there would be a revision, but that would sometimes be nothing or the whole document have completely changed. I could make a diff from the previous revision, and compare by line and look at how many percent of the lines have been changed. What are other doing revisions?

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  • How to properly install libsvm-3.11?

    - by Gomathi
    I'm using libvm-3.11. I downloaded it at http://www.csie.ntu.edu.tw/~cjlin/libsvm/ and extracted. Then I set path in Matlb. After that whenever I run my program, it gives the same error always. ??? Invalid MEX-file 'E:\Gomu\Gomu General\final yr Project\proj\libsvm-3.11\windows\svmtrain.mexw32': The specified module could not be found. . Error in == trysvm at 6 svmStruct = svmtrain(T,TrainMat,'showplot',true); What should I do?

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  • Why do I get unknown printer error 0xFA on my EPSON Workforce WF-3540 under Ubuntu 12.10?

    - by potofcoffee
    I recently bought an EPSON Workforce WF-3540, which I'm using under Ubuntu 12.10 with the official driver provided by EPSON. I am often printing batches of about a hundred pages, duplex. When I'm doing this, after about 20 pages, I regularly get an error message on the printer screen, telling me the printer encountered unknown error 0xFA, forcing me to turn the printer off and back on. I talked to EPSON about the problem, but they claim they're not supporting Linux and tell me to ask the Linux community about the problem (and possibly another driver?). So this is what I'm doing here... any ideas? Unfortunately, the documentation does not contain any information pertaining to error code 0xFA and the support hotline wasn't able to give me further information, either. BTW, the problem hasn't happened, so far, when I'm printing smaller batches or not using duplex. Whenever the problem happens, there's a page in the printer that's already been printed on one side, so I'm suspecting the problem's connected with the duplexer.

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  • Best practice in setting return value (use else or?)

    - by Deckard
    Whenever you want to return a value from a method, but whatever you return depends on some other value, you typically use branching: int calculateSomething() { if (a == b) { return x; } else { return y; } } Another way to write this is: int calculateSomething() { if (a == b) { return x; } return y; } Is there any reason to avoid one or the other? Both allow adding "else if"-clauses without problems. Both typically generate compiler errors if you add anything at the bottom. Note: I couldn't find any duplicates, although multiple questions exist about whether the accompanying curly braces should be on their own line. So let's not get into that.

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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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  • Unlock all private keys on Ubuntu, entering password only once at login

    - by conradlee
    I login to Ubuntu 12.04 using a password. Later on, when I use my browser(Chrome), I'm asked for a password to unlock the keychain so that the browser can access my saved credentials for various websites (it's the same password). Also, whenever I use SSH to connect to other computers using my private key, I am prompted for the same password to unlock my private key. How can I make it so that I am asked for my password exactly once per login (given that my login password is the same as the one I use for all my private keys)? Probably someone will try to label this question as a duplicate of this question, this question, or this question. While these questions are similar, none of them explicitly say that there still needs to be a password entered on login, as I am demanding here. As a result, the accepted solutions just say "set your passwords to blank"--I don't want that, it's dangerous! So I am aware of the similar questions, but none of them has received the correct answer yet, because they are slightly different.

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  • Creating symlink for Postgres

    - by Edwin
    As a developer, I often ssh right into my local database, just to test my application before pushing my code. However, I find that every time I want to access Postgres, I have to type in postgres@ubuntu:~$ /usr/local/pgsql/bin/psql test whereas on my work machine, all I have to do is type postgres@ubuntu:~$ psql --dbname=test --username=user I tried creating a symlink, which was successful, but whenever I try connecting to it through this shortcut, I get the following error message: psql: could not connect to server: No such file or directory Is the server running locally and accepting connections on Unix domain socket "/var/run/postgresql/.s.PGSQL.5432"? How do I get this to work? In case it makes any difference, I'm using a self-compiled version of the 9.1.x series.

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  • Use of Service Bus in a Pub-Sub Engine

    - by JoseK
    In one of our projects, we've built a Publisher - Subscriber Engine on Oracle Service Bus. The functionality being a series of events are published and subscribers (JMS queues) receive these whenever a new event is published. We are facing some technical issues now, performance-wise and hence an architectural review is underway. Now for my questions: Architecturally the ESB has to publish events into a DB and read from the DB which users wish to be notified, then push the event onto their respective queues. There is a high amount of DB interaction and the question is whether ESB should be having such high amount of interaction with the DB in the first place? Or should there have been some alternate component responsible for doing this. Alternately is there any non-DB approach in which we can store the events and subscribers? Where else can this application data be held within the ESB context?

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  • Coding style advice? [closed]

    - by user1064918
    I'm a newly grad. I've got a lot of complaints from my supervisor at work during code-review sessions with regard to my coding style (Surprise!). I don't know if it's just him being cranky or my style is really that annoying to read. I come from the low-level language world (assembly, mostly), so I've been taught to use bitwise ops and all the cool tricks to do math whenever possible. I also have the habits of doing some other things that've been regarded as "too excessively dense to read". So I'm hoping to get some feedback from any experienced programmers! :) Also how should I justify between code performance and readability? Thanks!!

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  • Why is Reflector such an essential utility?

    - by c152driver
    Reading the brouhaha surrounding Reflector going paid got me thinking about the product and its uses. Many people seem to consider it an essential tool. I have to admit, I haven't used Reflector in years. I mean, there's documentation for both the .Net APIs and the third party components I use. In the past, whenever a colleague pulled Reflector out of his tool belt, I got the sense he was headed into the weeds. Reading all the passion around Reflector is leading me to question if I'm really missing something here. Why do you need something like Reflector so often that you consider it an essential tool? I can see it being needed on very rare occasions, but not enough to be considered an essential tool. Please enlighten me.

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  • Choppy/unresponsive keyboard and mouse pointer until suspend

    - by Stefan Thyberg
    I had a problem where my mouse and keyboard would be choppy, the mouse pointer would work at 1-2 fps and the keyboard would keep missing letters as I was typing them. Since they were both USB I suspected there was a problem there immediately. Whenever I got this problem I would suspend the computer and start it again and the problem would be gone. The problem started appearing when I plugged the mouse and keyboard directly into the computer rather than the USB hub in the screen. I'm using a Logitech UltraX Flat and a Razer Lachesis, but I'm not sure if that matters.

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