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Articles indexed Friday June 28 2013

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• Randomization of biomes

  - by user24527

  You know how in Minecraft, the World is ever-expanding and all the biomes are randomized? My generalized question is: In relation to a space simulation that is also ever-expanding as the player moves about the world, how would one go about programming this randomization in Java? My real question is: Could I get a simplified example broken down into these example classes: astroids (This would include how many astroids there are, their positioning in space, their size, how often the larger astroids occur, how close they are to each other, the limitations of how many of the large asteroids can be in one field, how often astroid fields are generated, etc.) star-types (size, color, type, how often they occur, where hey occur, etc.) inhabitable-planets (size, positioning, how often they're generated, where they are generated, etc.) This would be very helpful currently since I wish to make a simplified version of such a program.

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• In which cases build artifacts will be different in different environments

  - by Sundeep

  We are working on automation of deployment using Jenkins. We have different environments - DEV, UAT, PROD. In SVN, we are tagging each release and placing same binaries in DEV, UAT, PROD. The artifacts already contains config files w.r.t each environment but I am not understanding why we are storing binaries in environment folder again. Are there any scenarios where deployment might be different for different environments.

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• php templating with codeigniter

  - by JaPerk14

  I am currently develop a website application in codeigniter, and I'd like to do something in PHP / CodeIgniter where I can make a common template for separate sections of the website. I was thinking that I would keep the header / footer in a separate php files & include them separately. The thing I'm not sure about is the content beneath the header and above the footer. This website application will contain a lot of different pages, so I'm having a hard time figuring how what's the best way to do this.

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• "Final" Scheme REPL definitions: how to save them?

  - by Aeneas

  Is there a way to show and save all "final" definitions entered into a Scheme REPL into a text file? Say, if I have defined in the REPL: (define (increase x) (+ 1 x)) (define (multbytwo x) (* 3 x)) ; let us say this was an error (define (multbytwo x) (* 2 x)) I want to save this into an .scm-file with the content: (define (increase x) (+ 1 x)) (define (multbytwo x) (* 2 x)) i.e. the multbytwo function that got defined erraneously shall be "forgotten" due to re-definition. Is this possible?

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• MVC : Does Code to save data in cache or session belongs in controller?

  - by newbie

  I'm a bit confused if saving the information to session code below, belongs in the controller action as shown below or should it be part of my Model? I would add that I have other controller methods that will read this session value later. public ActionResult AddFriend(FriendsContext viewModel) { if (!ModelState.IsValid) { return View(viewModel); } // Start - Confused if the code block below belongs in Controller? Friend friend = new Friend(); friend.FirstName = viewModel.FirstName; friend.LastName = viewModel.LastName; friend.Email = viewModel.UserEmail; httpContext.Session["latest-friend"] = friend; // End Confusion return RedirectToAction("Home"); } I thought about adding a static utility class in my Model which does something like below, but it just seems stupid to add 2 lines of code in another file. public static void SaveLatestFriend(Friend friend, HttpContextBase httpContext) { httpContext.Session["latest-friend"] = friend; } public static Friend GetLatestFriend(HttpContextBase httpContext) { return httpContext.Session["latest-friend"] as Friend; }

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• Should MVVM ViewModel inject an HTML template for default view?

  - by explunit

  I'm working on web application design that includes Knockout.js and have an overall MVVM question: Does it make sense for the ViewModel to automatically inject a default HTML template (pulled from separate file)? More detail: suppose I have a site like this... header... widget 1 widget 2 widget 3 footer ...and widgets 1/2/3 are going to be Knockout.js ViewModels determined at runtime from an overall list of available widgets, each with associated HTML template file. I understand that in MVVM you want the view (HTML template in this case) to be separate from the ViewModel (Javascript file in this case) so that people can edit it separately and possibly provide multiple templates for different "skins". However, it seems like it would also make sense for the ViewModel to point to a default html template that gets automatically used unless the controlling code provides a different one. Am I looking at this correctly? As an example, see this answer on StackOverflow where he recommends injecting the HTML and then the ViewModel. Seems like a one-liner would make more sense in that case, with the possibility of overriding a default template value.

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• j2ee implementing security and using a framwork pros and cons

  - by Ismail Marmoush

  I'm a newbie to j2ee security, and i'm not j2ee expert either, though i'm really willing to put some effort and learn I've an application that i'm about to develop on Google App Engine (GAE) --with no time constraints. As you know GAE handles a lot of web container security issues for you, also I will be using openID for authentication exclusively (sessions will be handled by provider). GAE supports SSL which will help with confidentiality and integrity maybe. Authorization can be done through filters. I know reinventing the wheel is a mess, but I was looking forward to learn something about security and implement that in my new app. so what the pros and cons of using a framework like shiro, spring security, jguard etc or filling the rest of gaps on my own ?

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• How to boot ubuntu on mac

  - by user170863

  I tried many ways to boot Ubuntu on my mac os. I do not have an internal cd drive but wen I tried to install it using the external cd drive(from apple), the drive does not work (Apple made it clear that u cant do this). I tried using many tools. I downloaded the amd64+mac edition and copid it to my usb using unetbootin.. it said that it would not boot of mac but the instructions on another blog was that it has no problems as the iso will take care. it also instructed to install refit and it worked for him but dosent boot for me. I even tried the terminal method of installing but didn't work... please help me out

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• Erratic typing in Ubuntu 13.04

  - by spencerrecneps

  I recently upgraded to 13.04 and have noticed that my keyboard randomly drops keystrokes. Furthermore, it will occasionally cause the last pressed key to "stick", leaving me with "typng that looks lik thisssssssssssssssssssssss". I do not believe that this is a hardware problem, as the keyboard worked just fine under 12.10 a few days ago. In addition, there are no Universal Settings turned on that would be causing this problem. I came across this unanswered Ask Ubuntu post that seems to identify part of my problem: Missing keystrokes in ubuntu 13.04 I was able to work around the repeated keystrokes problem by turning off the "key presses repeat when key is held down" option under the keyboard settings, but this is not an acceptable solution in the long term. Any thoughts?

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• Error message when running OpenGL programs with bumblebee

  - by user170860

  X Error of failed request: BadDrawable (invalid Pixmap or Window parameter) Major opcode of failed request: 152 (DRI2) Minor opcode of failed request: 8 (DRI2SwapBuffers ) Resource id in failed request: 0x4200005 Serial number of failed request: 2166 Current serial number in output stream: 2167 primus: warning: timeout waiting for display worker Segmentation fault (core dumped) I don't get this on all OGL programs, but only particularly GPU intense ones. Also, I only get this using primusrun. optirun gives the same error no matter what I run: [VGL] NOTICE: Pixel format of 2D X server does not match pixel format of [VGL] Pbuffer. Disabling PBO readback. I don't know what either of these mean. Neither of them stop the programs from running, but I'd like to fix the problem if there is one. Also, I prefer to use primusrun because it is faster and it does a better job with vertical sync, however, it only supports OGL 4.2. This isn't a big issue because the programs I write are forward compatible, but it still seems odd to me. So basically I'd just like it if someone could explain to me what is happening and if there is something I can do about it. Thanks.

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• Google Chrome Won't Open

  - by Mike Strand

  When I try to open Google Chrome from the launcher, nothing seems to happen. (this is a new phenomenon, it used to work). I'm on Ubuntu 13.04. When I try to open via the terminal with either $ google-chrome $ google-chrome --incognito I get, ":FATAL:zygote_host_impl_linux.cc(138)] The SUID sandbox helper binary was found, but is not configured correctly. Rather than run without sandboxing I'm aborting now. You need to make sure that /opt/google/chrome/chrome-sandbox is owned by root and has mode 4755." Any help would be appreciated.

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• Problem in Kubuntu: Default browser never opens

  - by user170852

  I'm using Kubuntu, and I switched the default browser to my favourite one. The thing is, when I did this, both my Twitter clients stopped working. Now each and every Twitter client I download and install fails to open any web browser to finish my account authorization. It's impossible they're all broken, so I reset my default browser to rekonq and it works well as a default browser, but still can't login to twitter from any client. In fact, every button in every program that should open a browser window (like Amarok with the "like on last.fm" button) does nothing. So I think there may be a problem with my system but I can't figure out what is it. My user is not in the admin group (it's a shared user), I have an admin user but I only use it to install programs. Could that be the cause? Also, hitting alt+F2 and writing man:file (enter) opens a rekonq window normally.

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• Eclipse no longer useful

  - by dgood1

  When I got my Eclipse from the Ubuntu Software Center, it was good and worked fine. I could work on Java projects fine. This week I was required to add ADT and tried the ADT-bundle, assuming it had everthing I needed, seeing that the SDK had more steps. So now, I can create Android apps using the ADT-bundle. I tried to work on my java projects again and I now discovered: I can't run my java projects: "The selection cannot be launched. And there are no recent launches." error. I also believe Eclipse doesn't know it's a java program because it all in black and white. Not the usual green/blue/red/black things when making comments, variables and Strings. I can't make new projects of ANYTHING unless I use the adt-bundle. New project only offers CVS (whatever that is) My perspectives seem limited. I remembered more choices and now I'm limited to [Java], Resource, CVS Repository, debug, Team Sync. I was told to be able to use perspectives to swap between Android and Java developing. Even after the ADT installation using "Install new Software",nothing. I can't uninstall/purge/remove Eclipse via the terminal. I tried removing it then reinstalling it via the Ubuntu Software Cetner. No results other than it's temporary removal. (Possibly unrelated) A large number of repositories are not found when updating Eclipse. (See Step 8 in Summary of what I did...) Although, on checking the versions and installation history, I confirmed Android and Java are installed. It probably just doesn't know it's there. Eclipse Indigo: Version: 3.7.2 Build id: I20110613-1736 Summary of what I did before and during the problem: Downloaded adt-bundle. Attempted instructions from teacher. (Install new Software) (Failed but other than an annoying "can't find repository" during each update, no damage to report) (Fixed) Ran "eclipse" executable from the adt-bundle. Updated Eclipse. (After restart, I noticed the problem) NOTE: other than window arrangement, I had no customizations. Played around with the Windowspreferences and Projectpropertied. Restored to default settings after no results. Tried "apt-get purge eclipse". Couldn't find Eclipse so, nothing happened. Used Software center. No results. Tried swapping workspaces. I tried different folder, deeper folder, renaming. All return the same problem. Deleted adt-bundle (browsed folders then delete). Got Adt-sdk only. Installed. Can't find any changes other than some disk space usage. Of course, I can't make Android apps until I unzip the bundle again. WindowsPreferencesInstall/UpdateAvailable Software Sites, Checked as many repositories as possible, then updated. Still nothing. I'm about to get a second try on uninstalling it, because I think my last action will just be taking up space. But I'll wait for tomorrow, in case the answer will help. Any thoughts?

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• How do I get adobe flash working in Chrome or Chromium on Ringtail?

  - by Matt H

  I have recently upgraded to Ringtail and for some reason flash isn't working on either Chrome or Chromium. It works in firefox but I prefer Chrome as my browser so switching to firefox when a website containing flash appears is a bit annoying. According to just about every source, flash it built into Chrome and should just work even on Ubuntu. I tried removing chrome and reinstalling it, but the problem persists. I've checked about://plugins and flash is enabled. Yet when you visit http://www.adobe.com/shockwave/welcome/ What I see is "No plugin available to display this content". about://version shows Google Chrome 28.0.1500.52 (Official Build 207119) OS Linux Blink 537.36 (@152651) JavaScript V8 3.18.5.8 Flash 11.7.700.203 User Agent Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/28.0.1500.52 Safari/537.36 Command Line /opt/google/chrome/google-chrome --blacklist-accelerated-compositing --flag-switches-begin --enable-sync-favicons --sync-keystore-encryption --flag-switches-end Executable Path /opt/google/chrome/google-chrome How do I get flash working in Chrome or Chromium?

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• SU, SUDO and Upgrade problem

  - by DigitalDaigor

  i have a big problem with my Ubuntu PC. When i try sometigng need sudo or su, nothing is working and the OS Upgrade too, when i write the root password to the su command i have a "autentication error", same in the upgrades and when i try the sudo command to install something i don't have error message and nothing happen. I was tring to make samba work when all goes wrong. Some help!? Thanks! Edit SSH connection refused and connection closed if i try to login from secondary PC I can't access recovery mode... With the autologin i can access the system, if i logout and try to login again return the autentication error

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• could not save the file /usr/... permission denied (13.04)

  - by plaguedoctor

  I am running Ubuntu 13.04 and am trying to create an .sh file for conky in /usr/bin using gedit. When trying to save I get the error dialogue: Could not save the file /usr/bin/conky-start.sh You do not have the permissions necessary to save the file. Please check that you typed the location correctly and try again." From searching, I think I have to run a command in terminal to allow permission, but I couldn't find out what that is. Edit: I'm trying to create the file conky-start.sh, not change or run it. Thus far, I've opened gedit, copied and pasted some required info from the net, and I'm trying to save-as /usr/bin/conky-start.sh Perhaps I need to create the file first in terminal, then edit it? How would I do that?

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• How do I change Firefox's `about:config` from a shell script?

  - by James Haigh

  On of the first things I do when first using a fresh Firefox profile, is to set browser.urlbar.trimURLs to false (which really should be changeable though ‘Preferences’ or should have remained default), and to change the search and homepage defaults to DuckDuckGo. Currently I manually go to about:config, click through the angry warning message, and search for the keys (which unlike in DConf Editor, aren't even organised). So I would like to know how to read and write these keys from the command-line so that I can add these tweaks to my customisations script.

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• Twitter "Authentication Error" Turpial & Choqok (latest versions)

  - by PineMarten

  I use Turpial a lot, but Turpial isn't connecting at all. I can still connect to Twitter thru the OS app (no issues signing in through Online Accounts) and of course I can still sign in using the browser, but Turpial gives me an "Authentication Error" and Choqok fails to do anything. I've tried changing my password, revoking the Turpial and Ubuntu apps in Twitter and re-enabling them, but then it gives me an "Invalid Credentials" message. I've even removed and installed Turpial multiple times, still nothing. I can't find any information or resources for this type of error from Turpial online. I think it may be something recent after finding this message elsewhere: (article related to "Birdie") It looks promising i'm currently using it atm, since all the other twitter clients no longer work due to the API 1.0 shutdown (posted today) I've never used Choqok before today, so I don't even know if I've set it up properly. It's failing to retrieve or send Tweets it just blank screens, but at least it signs in. I've figured that this isn't an issue with Ubuntu, or Turpial or Choqok, or the router (already replaced it today), so I don't really know what I'm dealing with here. I hope it's not another API issue, Facebook did something similar just a few weeks ago

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• VMWare Player pauses often

  - by pascal

  I'm using a 64bit Windows 8 inside vmplayer, with 2 virtual processor cores, virtual hard disk resides on a fast local disc and is not preallocated; host CPU is Intel i7 3770, should be capable of hardware virtualisation but I don't know if VMWare uses it; NAT networking; Sound card connected, USB connected, accelerated 3D graphics (NVidia 313.30 on host) My problem is, that the VM often pauses for a few seconds, and then speeds up for a few seconds to reach real time again. Time in the VM actually moves faster after the pause, for example all animations using timers speed up. When running, the vmware-vmx process shows ~150% CPU usage in top, but 0% when pausing (and D state i.e. waiting for IO). iotop shows normal disk writes from vmware-vmx threads, but during pauses, the flush kernel thread uses 99%. Are there some options to try so that VMWare doesn't wait for IO? I've tried a few things available from the GUI but the issue never went away…

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• Deluge bit torrent. No incoming connections?

  - by mark kirby

  Hi I keep getting a no incoming connections on my Deluge. I know this is a pretty common problem from Google, but I have posted here to see if any one knows why this happens. I have port forwarded my router and set Deluge to the correct port range. Is this just a bug ? It does not seem to affect the speed so I obviously do have incoming connections and Transmission says the ports are open. So I guess my question is why is this happening ?

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• Is a security seal or EV SLL more important?

  - by Guy

  Does anybody know of a survey or study that compares site visitor attitudes/perceptions to security between an EV SSL cert and a security seal? The EV SSL cert will show up green in the URL (like a bank) and the security seal is usually in the footer and says something like "secured by" or "hacker proof" or "website protection" I'm looking for evidence that if you could only chose one, which would it be?

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• sitemaps for growing content and googlesitemapgenerator

  - by user1583209

  The number of URLs on my website is constantly growing (by 10-50 per week or so). Should I Regularly submit an updated sitemap including all URLs. Have a sitemap of only the static content of my website. Have some tool which automatically creates sitemaps on any changes. As for 3) is googlesitemapgenerator useful in this respect? I am a bit anxious allowing a beta product mess with my apache. Is anybody using it or has another recommendation of similar tools?

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• Could multiple uses of the same keywords in image alt attributes hurt SEO?

  - by saratogahiker

  Let's say on an e-commerce site that sells unique pens, on a particular pen's product page, the image of the pen has an alt attribute value of "unique red-striped pen"... and another product has "unique blue-spotted pen", etc... The keywords across all products being "unique" and "pen", which would also be helpful when it comes to SEO. However, if the person just goes to the general "unique pens" category page and sees a list of thumbnail images, each with the words "unique" and "pen" in the alt attribute, would that potentially have a negative impact with regards to SEO by having the same keywords too many times?

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• Robots.txt Disallow command [on hold]

  - by Saahil Sinha

  How to disallow folders through Robots.txt, which are been crawled due to wrong url structure, which thus cause duplicate page error The URL been crawled as incorrectly by Google leading to duplicate page error: www.abc.com/forum/index.php?option=com_forum However, The actual correct pages however are: www.abc.com/index.php?option=com_forum Is this a correct way by excluding them through robots.txt: To exclude www.abc.com/forum/index.php?option=com_forum Below is command Disallow: /forum/ Will it not block in legitimate component folder 'Forum' of site?

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• Creating ground in a 2D runner game

  - by user739711

  It may be a repetitive uestion but I could not find any specific answer to my query How to create A slanted/curved ground in a 2d runner game. The user will see side view like the old game "Mario" If I use tiled based map I can have only rectangular objects. What is the best way to create tilted ground? Should I use tiled based map, or should I define corner points in the map and create the ground programatically? And what are the difficulties in creating curved ground.

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