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• Dynamic navigation mesh changes

  - by Nairou

  I'm currently trying to convert from grids to navigation meshes for pathfinding, since grids are either too coarse for accurate navigation, or too fine to be useful for object tracking. While my map is fairly static, and the navigation mesh could be created in advance, this is somewhat of a tower defense game, where objects can be placed to block paths, so I need a way to recalculate portions of the navigation mesh to allow pathing around them. Is there any existing documentation on good ways to do this? I'm still very new to navigation meshes, so the prospect of modifying them to cut or fill holes sounds daunting.

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• Mojarra (JSF) 2.1.2 is here

  - by alexismp

  The Mojarra 2.1.2 release was cut a few days ago. Here are the full Maven coordinates : api, impl. You can also get to the release notes and to the list of bugs fixed in this release. This is scheduled for inclusion into the upcoming GlassFish 3.1.1 release. In fact it's already integrated in the latest promoted build (#8) which also includes woodstox 4.1.1. Weld 1.1.1.Final has already been integrated a few builds ago. The JSF team is now working on JSR 344 (JSF 2.2) for which you can get a status by visiting http://jsf-spec.java.net/ and the associated mailing lists. A first expert draft is now available.

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• PS2 keyboard scroll wheel doesn't show up on xev, how to make it work?

  - by ncomx

  I have a ps2 keyboard that has a scroll wheel on the side, it doesn't work on Ubuntu 12.04 so I though to just check xev and map the correct key. But xev doesn't show up anything when moving the scroll wheel. The keyboard is this one (A4Tech KBS-26), it works fine on Windows without adding any extra driver. On linux most buttons work, multimedia, calculator, browser, etc. The only thing that doesn't work is the scroll wheel and copy/paste/cut/undo buttons, and they don't show up on xev either. Does someone knows how to make it work?

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• If I create a link to a folder, how can I get from that linked folder to the "real" folder from within Nautilus?

  - by snowguy

  Say I have a folder several layers down in my documents folder. And I want easy access to it from my desktop. To do that I: Go to the parent folder in Nautilus. Right click on the folder's Icon and choose Make Link Cut / Paste the new "Link to ..." folder onto my desktop. Great. And mostly this works fine for me. But suppose I want to get to that folder's parent. I can of course get there using the original path--what Nautilus calls the "link path" which I can see in the properties of the folder. But that seems harder than it ought to be. How can I click on the folder and go to the link path directly?

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• Is Ruby on Rails' Active Record an example of Aspect-Oriented Programming?

  - by B Seven

  From Clean Code, about Cross-Cutting Concerns: Note that concerns like persistence tend to cut across the natural object boundaries of a domain. You want to persist all your objects using generally the same strategy, for example, using a particular DBMS... Is Active Record an example of aspect-oriented programming? In AOP, modular constructs called aspects specify which points in the system should have their behavior modified in some consistent way to support a particular concern. This specification is done using a succinct declarative or programmatic mechanism. If Active Record is an example of AOP, what is the "aspect"? Is it the class declaration that inherits from Active Record? class Foo < ActiveRecord::Base

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• Shutdown, Restart, Halt issues, not powering off system

  - by Jalomba

  Before any one says search around, I have, to no avail. I can't seem to get it working after trying every fix out there. So basically, when I turn off my laptop it shuts down fine but the last line is "System will now halt" but power never gets cut, I've tried shutdown -P and shutdown -h same result. Then when I try restart it goes through the same process but hangs on "System will now restart" But I can't figure it out, I am running full Ubuntu with no other Operating Systems. Any tips?

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• Writing a Data Access Layer (DAL) for SQL Server

  In this tip, I am going to show you how you can create a Data Access Layer (to store, retrieve and manage data in relational database) in ADO .NET. I will show how you can make it data provider independent, so that you don't have to re-write your data access layer if the data storage source changes and also you can reuse it in other applications that you develop. Free trial of SQL Backup™“SQL Backup was able to cut down my backup time significantly AND achieved a 90% compression at the same time!” Joe Cheng. Download a free trial now.

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• root and home are on seperate partitions, but home still uses up space on root?

  - by Void

  When installing Ubuntu 12.10 for the first time, I made sure /home had it's own partition, gave it about 185GB, and gave root ~10GB. Now root is almost full after a few days and I've noticed that root is as big as /home and some additional MB from some actual root files. Note that I deleted some unused files in /home to make sure it really affects how much space is used in root, and it clearly does. (checked in gparted) I've also made sure the files I am talking about are actually in /home/myname/ and not just in root's home. df -h spits out this information: df: `/root/.gvfs': Permission denied Filesystem Size Used Avail Use% Mounted on /dev/sdb2 9.2G 7.9G 908M 90% / udev 3.9G 12K 3.9G 1% /dev tmpfs 1.6G 932K 1.6G 1% /run none 5.0M 0 5.0M 0% /run/lock none 3.9G 6.4M 3.9G 1% /run/shm none 100M 112K 100M 1% /run/user /dev/sdb3 184G 4.9G 170G 3% /home /dev/sdb4 729G 87G 642G 12% /media/mave/Storage I cut out my windows partitions as I don't see any relevance. I hope this is enough information for someone to tell me what I did wrong

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• What library should I use for 2D Geometry? [closed]

  - by Luka

  I've been working on a 2D game in java, but found that java just didn't cut it for me and had forced me to a lot of bad design choices, so I've decided to port all my work to c++. The main reason I've decided change to c++ is that i had reached a point where i had 3 geometry libraries (the native, one from the game engine and one to handle "complex" polygons), none of witch worked very well together and i couldn't keep track of them. I'm new to c++, but i know all the basics. My question is, what would be a good geometry library to use, ideally it should be able to handle integer and decimal data types, have point, line, and polygon classes witch are able to check for intersection and contains. Thanks in advance, Luka

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• Immutable design with an ORM: How are sessions managed?

  - by Programmin Tool

  If I were to make a site with a mutable language like C# and use NHibernate, I would normally approach sessions with the idea of making them as create only when needed and dispose at request end. This has helped with keeping a session for multiple transactions by a user but keep it from staying open too long where the state might be corrupted. In an immutable system, like F#, I would think I shouldn't do this because it supposes that a single session could be updated constantly by any number of inserts/updates/deletes/ect... I'm not against the "using" solution since I would think that connecting pooling will help cut down on the cost of connecting every time, but I don't know if all database systems do connection pooling. It just seems like there should be a better way that doesn't compromise the immutability goal. Should I just do a simple "using" block per transaction or is there a better pattern for this?

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• Linqpad and Autocompletion

  I have mentioned before about doing development for StreamInsight in Linqpad. I have it installed on two separate PCs and I have enabled autocompletion on only one of them. Whilst both versions are an excellent tool, the one with autocompletion enabled is so much easier to use. After enabling autocompletion you can see I now get parameter listing Free trial of SQL Backup™“SQL Backup was able to cut down my backup time significantly AND achieved a 90% compression at the same time!” Joe Cheng. Download a free trial now.

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• how to recover all database when migrate to 5.5.8 from 5.5.1

  - by anirudha

  the installation process of MySQL on windows are very simple as other software you need just configure them and they works. but somebody after migrating their mysql server to 5.5.8 confuse that their old database is now gone but it’s not  you need to do something to get back go to C:\ProgramData\MySQL\MySQL Server 5.1\data the programdata folder commonly hidden in any version of windows. you find their some folder cut them all you want to recover. note that don’t copy the file mainly in data folder just like err pid or log because they are configuration file and the configuration of mysql 5.1 and 5.8 both are different after copy the folder  go to C:\ProgramData\MySQL\MySQL Server 5.5\data paste here the folder restart mysql and all database is now in your hands.

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• Does this factory method pattern example violate open-close?

  - by William

  In Head-First Design Patterns, they use a pizza shop example to demonstrate the factory method pattern. public abstract class PizzaStore { public Pizza orderPizza(String type) { Pizza pizza; pizza = createPizza(type); pizza.prepare(); pizza.bake(); pizza.cut(); pizza.box(); return pizza; } abstract Pizza createPizza(String type) } public class NYPizzaStore extends PizzaStore { Pizza createPizza(String item) { if (item.equals("cheese") { return new NYStyleCheesePizza(); } else if (item.equals("veggie")) { return new NYStyleVeggiePizza(); } else if (item.equals("clam")) { return new NYStyleClamPizza(); } else if (item.equals("pepperoni")) { return new NYStylePepperioniPizza(); } else return null; } } I don't understand how this pattern is not violating open-close. What if we require a beef Pizza, then we must edit the if statement in the NYPizzaStore class.

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• Shinkansen for ASP.NET MVC Now Available

  While building Morts and Elvises with MVC2, I cut over Shinkansen to support MVC syntax within views and master pages. I’ve included a sample MVC project, which you can either download from Codeplex or view online: view or download source code. In either case, peek inside Site.Master and you’ll see CSS includes at the top… <%= ShinkansenMvc.Includes (c = { c.AddCss ("~/assets/css/addthis_widget.css"); c.AddCss ("/assets/css/reset.css"); c.AddCss ("assets/css/sifr.css"); ...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• Creating a user called 'root'

  - by pnp

  I am creating Virtual Machines using the ubuntu-vm-builder. The syntax goes something like this: ubuntu-vm-builder kvm precise \ --domain newvm \ --dest newvm \ --arch i386 \ --hostname hostnameformyvm \ --mem 256 \ --user john \ --pass doe \ --ip 192.168.0.12 \ --mask 255.255.255.0 \ --net 192.168.0.0 \ --bcast 192.168.0.255 \ --gw 192.168.0.1 \ --dns 192.168.0.1 \ --mirror http://archive.localubuntumirror.net/ubuntu \ --components main,universe \ --addpkg acpid \ --addpkg vim \ --addpkg openssh-server \ --addpkg avahi-daemon \ --libvirt qemu:///system ; I need to enable the 'root' user account after creating each of my VMs (and supply a password for it). I was just wondering whether I can take this short-cut of supplying the username (--user) as root in this command itself. If I supply username as root to create my VMs, am I creating/enabling the root user, or just creating a user named as root? p.s.: any better ways to achieve my task are also welcome. But I don't want to manually meddle with each VM after its creation

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• BIT of a Problem

  The BIT data type is an awkward fit for a SQL database. It doesn't have just two values, and it can do unexpected things in expressions. What is worse, it is a flag rather than a predicate, and so its overuse, along with bit masks, is a prime candidate for being listed as a 'SQL Code Smell'. Joe Celko makes the case. Free trial of SQL Backup™“SQL Backup was able to cut down my backup time significantly AND achieved a 90% compression at the same time!” Joe Cheng. Download a free trial now.

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• Clarify the Single Responsibility Principle.

  - by dsimcha

  The Single Responsibility Principle states that a class should do one and only one thing. Some cases are pretty clear cut. Others, though, are difficult because what looks like "one thing" when viewed at a given level of abstraction may be multiple things when viewed at a lower level. I also fear that if the Single Responsibility Principle is honored at the lower levels, excessively decoupled, verbose ravioli code, where more lines are spent creating tiny classes for everything and plumbing information around than actually solving the problem at hand, can result. How would you describe what "one thing" means? What are some concrete signs that a class really does more than "one thing"?

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• Results stored in a session - good idea?

  - by Nick

  To give a bit of background, lets say it's a generic results page, which is paginated so there are X results per page. Generally to do this, I have two queries on the page: to get the total number of results to get the results, limiting by the correct page's resultset However, recently I've been trying to cut down on the queries the site is making, and I thought one way to do this would be to only do the query if any parameters to the page have changed (except of course the page number)? This would then cache all the result id's in a session, which can be sliced when I need to return the correct resultset for that page. I was trying to look around the net to see if there are downsides of this method, but I've found very little information about it. Has anyone done this before? Is it a good idea?

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• Not enough space left in the hard drive. How to proceed?

  - by jimbobjgr

  Where do I begin... I can hardly do anything on Ubuntu 12.04. I am very close to removing and returning to Windows. First I could not load it because the graphics appeared to be running low but somehow that stopped happening and I could log on. Now I can not download anything or I get this message Cannot write: No space left on device. I tried trouble shooting this issue but every time I try and fix the problem I am blocked by this message E: Write error - write (28: No space left on device) E: Can't mmap an empty file E: Failed to truncate file - ftruncate (9: Bad file descriptor) E: The package lists or status file could not be parsed or opened. $ OLD=$(ls -tr /boot/vmlinuz-* | head -n -2 | cut -d- -f2- | awk '{print "linux-image-" $0}') Ubuntu is also running incredibly slow and I cant get anything done! Please help this is driving me mad!

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• Chemical alternatives to caffeine / coffee for mental clarity and alertness? [on hold]

  - by einsteinx2

  Currently I drink about 2 cups of coffee or tea a day (one in the morning and one in the afternoon usually). However I'm very sensitive to stimulants and drinking caffeine regularly keeps my resting heart rate really high, causes occasional heart palpitations, and sometimes trouble sleeping. I've tried going without coffee, and while I can do it, I have trouble concentrating at work and even just enjoying my work. I'm borderline ADD (or possibly full on ADD, but haven't been checked). And I tend to lose focus easily if I don't have some coffee or tea in me. For health reasons, I'd like to cut it out completely, but when I do my work performance seriously suffers. I already work out (cardio and/or weight lifting) 5 - 6 days a week, and get an average of about 8 hours of sleep, but I still can't focus throughout the day without caffeine. Are there any over the counter chemical or supplement alternatives for mental clarity that you've used with success don't cause the additional unwanted physical side effects that come with regular stimulants like caffeine?

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• News from OpenWorld: Innovation Across Fusion Middleware Product Portfolio

  - by Tanu Sood

  Oracle today announced that it continues to drive innovation across its Oracle Fusion Middleware product suite and extend industry’s #1 business innovation platform for the enterprise and the cloud.   Innovations across Oracle Fusion Middleware product portfolio help customers and partners to innovate, cut costs, and reduce complexity. Oracle Fusion Middleware components include  Oracle SOA Suite, Oracle WebLogic Server, Oracle WebCenter, Oracle Business Intelligence, Oracle Identity Management and Oracle Data Integration. Additional Resources: Press Release: Oracle announces Identity Management 11g Release 2 Press Release: Oracle announces Oracle Identity Governance Suite Press Release: Oracle announces Oracle Privileged Account Manager Website: Oracle Identity Management On-Demand webcast: Identity Management 11gR2 Launch Oracle Magazine: Security on the Move

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• How could your company's learning/development department best serve you?

  - by MTR

  I'll preface my question with a disclaimer - I am not an engineer, I'm just someone who works with them full-time, in a learning and development capacity. Given that, one of the comments I get regularly from the engineers I'm tasked with developing is that they feel that they're having solutions (both technical and non-technical) for development "pushed" at them vs. anyone from my field consulting with them to determine what they really need. So my question is - if you could give your company a list of the top 3-5 things they could do - in a classroom, or elsewhere - to develop meaningful skills that would help you be a better engineer, a better employee, and one more likely to STAY with the company for the long haul, what would make the cut and why? Thanks in advance for your responses.

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• Embedding Pygame to C++ [closed]

  - by Pendertuga

  If embedding Pygame to C++ to have a game be an executable, is there any extra process I would have to use in order to use Pygame functions when embedding into C++? As opposed to just writing embedding code in C++ for normal Python code? To clear cut the question I want to know if it's the same process without having to call different functions. EDIT: My question is if I have to call different functions in C++ when embedding Python code that uses Pygame modules. I am NOT using pygame2exe nor py2exe. I never even mentioned those. My question is solely about code embedding.

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• Issue with text in a Intel 82945G Express Chipset Family

  - by user34681

  I am on Ubuntu 11.04 and the text in all the applications often looks with visual artifacts. I have installed xserver-xorg-video-intel. Attached a image so you can appreciate. lshw -c video output: *-display description: VGA compatible controller product: 82945G/GZ Integrated Graphics Controller vendor: Intel Corporation physical id: 2 bus info: pci@0000:00:02.0 version: 02 width: 32 bits clock: 33MHz capabilities: msi pm vga_controller bus_master cap_list rom configuration: driver=i915 latency=0 resources: irq:16 memory:dfe00000-dfe7ffff ioport:8800(size=8) memory:e0000000-efffffff memory:dfe80000-dfebffff In the text selected in green you can see the 'Online', 'File' and 'hassle' words cut.

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• Contiguous Time Periods

  It is always more efficient to maintain referential integrity by using constraints rather than triggers. Sometimes it isn't obvious how to do this. Until a recent idea by Alex Kuznetsov, the history table presented problems for checking data that were difficult to solve with constraints. Joe Celko explains. Free trial of SQL Backup™“SQL Backup was able to cut down my backup time significantly AND achieved a 90% compression at the same time!” Joe Cheng. Download a free trial now.

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