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• How to prevent a Gtk.SourceView from grabbing the URI of a file

  - by laboleite

  I'm making a text editor using GTK3 in Vala. I need to drag a file and, when I drop it into the application window, the application opens that file. I'm using a Gtk.Notebook that contains the Gtk.SourceView's. It works when I drop a file into an empty Gtk.Notebook, but when there is at least one Gtk.SourceView's appended on it, the SourceView grab the URI of the file, shows it and the window can't handle the opening of the file. In this case, what can I do to prevent a Gtk.SourceView from grabbing the uri of a file when I drop a file into a Gtk.SourceView. PS: I tried to use the drag_dest_unset() inside the SourceView derived class. It worked, the SourceView didn't grab the URI and the window could open the file, but the application showed a message like this, in runtime: Gtk-WARNING **: Can't set a target list on a widget until you've called gtk_drag_dest_set() to make the widget into a drag destination

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• Making a collision detection system

  - by Sri Harsha Chilakapati

  I'm very new to game development (just started 3 months ago) and I've learning through creating a game engine. It's located here. In terms of collision, I know only brutefoce detection, in which case, the game slows down if there are a number of objects. So my question is How should I program the collisions? I want them to happen automatically for every object and call the object's collision(GObject other) method on each collision. Are there any new algorithms which can make this fast? If so, can anybody6 sh6ed some light on this topic? And I think of making it like the game maker Thanks

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• How to perform simple collision detection?

  - by Rob

  Imagine two squares sitting side by side, both level with the ground like so: A simple way to detect if one is hitting the other is to compare the location of each side. They are touching if all of the following are false: The right square's left side is to the right of the left square's right side. The right square's right side is to the left of the left square's left side. The right square's bottom side is above the left square's top side. The right square's top side is below the left square's bottom side. If any of those are true, the squares are not touching. But consider a case like this, where one square is at a 45 degree angle: Is there an equally simple way to determine if those squares are touching?

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• What is the increase in developer productivity while using Hibernate?

  - by Tarun Kohli

  I was curious to find out the percentage increase in developer's productivity by using Hibernate. We use both Hibernate and NHibernate extensively and find them to be extremely elegant frameworks but haven't undertaken any study to find out the time savings by using them. IMHO, one could get a good 30 to 40% jump in developer productivity as one doesn't have to write the basic CRUD operations and bother about caching. But, are there are any formal case studies which prove that point? I would really appreciate if someone could direct me to a published white paper about some statistics about the productivity gains.

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• Why do Core Data sqlite table columns start with 'Z'?

  - by Dia

  I was looking at the sqlite table that Core Data generates and noticed that all table columns start with 'Z'. I realize this is an implementation detail, but I was curious as to why that's the case and if there was a design decision involved in this. Anyone happen to know or guess why? Here's a sample schema output of Core Data sqlite database: sqlite .schema CREATE TABLE ZPOST ( Z_PK INTEGER PRIMARY KEY, Z_ENT INTEGER, Z_OPT INTEGER, ZPOSTID INTEGER, ZUSER INTEGER, ZCREATEDAT TIMESTAMP, ZTEXT VARCHAR ); CREATE TABLE ZUSER ( Z_PK INTEGER PRIMARY KEY, Z_ENT INTEGER, Z_OPT INTEGER, ZUSERID INTEGER, ZAVATARIMAGEURLSTRING VARCHAR, ZUSERNAME VARCHAR ); CREATE TABLE Z_METADATA (Z_VERSION INTEGER PRIMARY KEY, Z_UUID VARCHAR(255), Z_PLIST BLOB); CREATE TABLE Z_PRIMARYKEY (Z_ENT INTEGER PRIMARY KEY, Z_NAME VARCHAR, Z_SUPER INTEGER, Z_MAX INTEGER);

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• Calling Web Service with Complex Parameters in ADF Mobile

  - by Shay Shmeltzer

  Many of the SOAP based web services out there have parameters of specific object types - so not just simple String/int inputs. The ADF Web service data control makes it quite simple to interact with them. And this applies also in the case of ADF Mobile. Since there were several thread on OTN asking about this - I thought I'll do a quick demo to refresh people memory about how you pass these "complex" parameters to your Web service methods. By the way - this video is also relevant if you are not doing mobile development, you'll basically use the exact same process for building "regular web" ADF applications that access these types of Web services. One more thing you might want to do after you create the page is look at the binding tab to see the method call in there, and notice the parameters for it in the structure property. Go and look at their NDValue property to get the complete picture.

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• Find Nearest Object

  - by ultifinitus

  I have a fairly sizable game engine created, and I'm adding some needed features, such as this, how do I find the nearest object from a list of points? In this case, I could simply use the Pythagorean theorem to find the distance, and check the results. I know I can't simply add x and y, because that's the distance to the object, if you only took right angle turns. However I'm wondering if there's something else I could do? I also have a collision system, where essentially I turn objects into smaller objects on a smaller grid, kind of like a minimap, and only if objects exist in the same gridspace do I check for collisions, I could do the same thing, only make the gridspace larger to check for closeness. (rather than checking every. single. object) however that would take additional setup in my base class and clutter up the already cluttered object. TL;DR Question: Is there something efficient and accurate that I can use to detect which object is closest, based on a list of points and sizes?

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• How Does The Maybe Monad Relate To The Option Type?

  - by Onorio Catenacci

  I was doing a presentation on F# and was discussing the Option type when someone in the audience asked me if the Option type is F#'s implementation of the maybe monad. I know that's not the case but I did want to ask how the two concepts are related. I mean it seems to me that an option type might be the result of the operation of a maybe monad but I'm not even sure of that. Would someone elucidate the relationship between the maybe monad and the option type in those functional languages which support it?

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• How does "rm" on a NTFS filesystem differs from Window's own implementation?

  - by DavideRossi

  I have an external USB disk with an NTFS filesystem on it. If I remove a file from Windows and I run one of the several "undelete" utilities (say, TestDisk) I can easily recover the file (because "it's still there but it's marked as deleted"). If I remove the file from Linux no utility (unless I use a deep-search signature-based one) can recover the file. Why? How is unlink implemented in Linux's NTFS file system code? It looks like it does not just "mark it as undeleted" but it wipes away some on-disk structure, is this the case?

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• Job Change Problem [closed]

  - by Anurag Jain

  I joined an organisation in April 2010. I just changed my job in January 2012. I was previously working with Java. But in my current organisation, the work is not in java. They told me in the interview that the work will be use Java technology. But this is not the case. I dont want to lose my previous Java experience. And moreover, in my current company , I am working on a language which is not used anywhere. I want to change again. Can anyone please help and guide me that will there be any issue now in changing the job again.?

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• Making retro games: Any good known game architectures?

  - by A.Quiroga

  I'm trying to do a remake of Snowbros . I'm doing it using libgdx but at each time i must try to thought how things got done . For example the physics of the jump and collisions . It seams to be time perfect , but i use the deltaTime to try to aproximate the value in game . I think in this case maybe its using some calcs with processor Hz , but i don't know. Then the simple question , is there any resources of how did they programm this games? Or any idea of the simple ideas repeated each game to game in the old style retro games.

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• E-commerce + CMS: 2 sites or one?

  - by Guandalino

  Ok, let's say that a customer already has a CMS managed web site but now wants to sell goods online using an E-commerce platform (Magento in this case). My question is, does it make any difference between choosing to have just one site running both CMS and E-commerce (www.mycompany.com, or to have one site for the CMS (www.mycompany.com) and another (www.mycompany-shop.com) for E-commerce? I'd like to know the pros and cons of these approaches, so that I can advice the customer for the best. --EDIT I forgot to say that I'd prefer to have 2 separated web sites. This way I shouldn't have to learn how to integrate them together (one in Python, the other in PHP).

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• Logging in over and over again. How to fix this?

  - by romeovs

  Ok, I messed up. I installed ubuntu 11.10, installed awesome wm and removed unity, to have something to fall back on, I also installed gnome-session-fallback. I was messing around and did the following, because the awesome wiki told me to: gconftool-2 --type bool --set /apps/nautilus/preferences/show_desktop False # Still disable the buggy Nautilus desktop thing gconftool-2 --type string --set /desktop/gnome/session/required_components/windowmanager awesome # sets awesome as wm Now here's what's wrong: I can start up decently, and then I get into a login window (that of gnome-session-fallback). I enter my username, select the preferred window manager (awesome in my case) and enter my password. It accepts these, but then hold for a second and just opens the login window again, in effect preventing me from actually logging in. I also tried gconftool-2 --unset (from the tty) on these settings, but that didn't work either. What can I do to revert the gconftool-2 settings to something that should work? I tried apt-get purging gnome-session-fallback and lightdm, and then installing them again, but that didn't work.

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• Lag compensation of projectile shooting game

  - by Denis Ermolin

  I'm thinking about an algorithm for firing projectiles with lag compensation. Now I did find only one descent solution: Player hits fire button. Client sends input "fire". Client waits for server response. Server generates bullet then sends response to client. Client recieves response and finally fires projectile. Is this solution only "trueway"? I find it the only one that can be fair to all of the clients. Valve in this case, doesn't compensate lag from rocket shots. I am feeling that I will not compensate it, too. I think that with today's bandwidth I can close my eyes on this problem, because I don't see any solutions with fair logic. What do you think?

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• Using shortkeys to search the internet for a term selected in a text editor/viewer

  - by cipricus

  It seems possible (as I learned from a comment to this question made by user55822) to use a command in order to search a term on the web by using "keybinding" the way Aretha is used. What the aforementioned user says is that "you could search mouse selection anywhere by using an app like Artha, or by keybinding sh -c 'firefox "http://translate.google.com/#en/fr/$(xclip -o)"' (example given translate english into french)" A lot of things are obscure for me here. I could use Artha or keybinding (as alternative), or both? How to do that in each case? and "The command I gave you will open google translate in Firefox with your mouse selection (text highlighted) as a query. Use sh -c 'firefox "https://www.google.com/search?q=$(xclip -o)"' if you want regular Google over Google translate. And obviously, that would work everywhere" I do not know what to do with that formula. What should I do exactly? How to use it? In what application?

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• Is it possible to construct a cube with less than 24 vertices

  - by Telanor

  I have a cube-based world like minecraft and I'm wondering if there's a way to construct a cube with less than 24 vertices so I can reduce memory usage. It doesn't seem possible to me for 2 reasons: the normals wouldn't come out right and per-face textures wouldn't work. Is this the case or am I wrong? Maybe there's some fancy new dx11 tech that can help? Edit: Just to clarify, I have 2 requirements: I need surface normals for each cube face in order to do proper lighting and I need a way to address a different indexes in a texture array for each cube face

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• Do you count a Masters in CS as a negative? [closed]

  - by Pete Hodgson

  In my experience interviewing developers I feel like candidates who've achieved a Masters in Comp Sci tend to be worse programmers on average that those who don't have a Masters. Is that just me, or have others noticed this phenomenon? If so, why would that be the case? UPDATE I appreciate the thoughtful comments. I think I should have been clearer in the comparison I'm making. Given two candidates who graduated from college around the same time, someone who went on to gain a Masters seems on average to be a worse programmer than someone who spent all their time in industry.

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• Copy and Paste problems in Visual Studio 2010

  tweetmeme_source = 'alpascual';After installing Visual Studio 2010 I started having problems with Copy and Paste. Trying to find out how many users are being affected by this bug. The use case to reproduce the bug, just using VS2010 for a few minutes and eventually doing Control C and Control V to copy lines of code does not work. Using the menu to do the copy and paste also wont work. Looks like a problem in the clipboard itself IMHO. The set up of my computer. Windows 7 Professional with 4...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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• DLNA Server/Control Point like Windows Media Player

  - by csde_rats

  Yes, I know that most questions ending with "like Windows" are odd, but this one really bothers me ;) If you ever used some DLNA renderer (in my case DLNA-enabled loudspeakers) you probably know the handy "play to"-feature. From my knowledge of DLNA stuff I would guess, that Windows Media Player is both a DLNA server and control point here, so my question is: Is there any similar software for Linux accomplishing the same thing with minimal configuration effort? I normally use Banshee for my music library, but it doesn't seem that there is anything available for Banshee...

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• Complete deployment to AWS

  - by Ionut

  I'm trying to deploy a Java Application to AWS free tier. I need the following: RDS provider. Using MySQL client S3 service. This is required for the Lucene Index and image uploading SES service. I need to be able to send emails to new registered users. Namecheap is my domain provider. EC2 instance Elastic Beanstalk instance. I managed to create an EC2 instance, upload the WAR file and link it to the Namecheap domain. However I find it difficult to link the other instances to the current application. I find the documentation a little messy and I can't find the right way to do this. Can you provide a simple walk through to deployment for this use case? Thanks!

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• I can't click on some things and other problems

  - by Ruben

  I have some issues with my Ubuntu 12.04 . When I open Ubuntu Software Center, the program opens and than just disappears just when it is opened. My Ubuntu 12.04 won't install any updates because of this error in the picture. Worst of all: I can't click on anything except for programs that from Ubuntu: for example I can't browse the internet via Firefox or Chromium... I can't click on folders. I can't click on things in my Thunderbird mail program. But I can click on Update manager for example... It is just clicking that doesn't work, when I try 'clicking' something with using the tab-button and enter I can click on something - in every case. But that's just too annoying to do. Oh sorry guys I had some screenshots that illustrate the problems, but I can't get them off the 'problem pc ubuntu 12.04' about which I am talking... it's so sad

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• Do search engines rank internal redirects negatively?

  - by siverd

  A client is in the late stages (code complete) of a website redesign and unfortunately hasn't implemented 301 redirects to point high traffic pages to the new URL's. As I understand it our only option at this point is to create redirects within the CMS. Our CMS allows us to do this: www.mysite.com/category/current-page.html will redirect to www.mysite.com/new-category-name/new-page.html The site now uses custom logic on our 404 page to check this list of redirects and if one exists forwards the user to the new-page.html I understand that using 301 redirects would be the correct way to maintain our page rank but I think that would require a code change which isn't possible. Question How will search engines respond to this? Will they wait until the redirect happens and allow us to keep our page rank (authority, trust, etc) or will they see the 404 page and down-rank us? Worst case...will they make our new-page.html start from a rank of "0"? Thanks for your help.

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• I'm trying to install Bruteforce Savedata from the archiver

  - by Jonathan

  I've just installed UBUNTU 12.04 for curiosity purposes. I'm a gamer and I wanted to install Brute force Save data on my comp. So i download it and it open in the Archive manager i go to run the ".exe" but encounter this message Archive: /home/c4/Desktop/Bruteforce_Save_Data_installer.exe [/home/c4/Desktop/Bruteforce_Save_Data_installer.exe] End-of-central-directory signature not found. Either this file is not a zipfile, or it constitutes one disk of a multi-part archive. In the latter case the central directory and zipfile comment will be found on the last disk(s) of this archive. zipinfo: cannot find zipfile directory in one of /home/c4/Desktop/Bruteforce_Save_Data_installer.exe or /home/c4/Desktop/Bruteforce_Save_Data_installer.exe.zip, and cannot find /home/c4/Desktop/Bruteforce_Save_Data_installer.exe.ZIP, period. Please help!

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• Procedural Planets, Heightmaps and Textures

  - by henryprescott

  I am currently working on an OpenGL procedural planet generator. I hope to use it for a space RPG, that will not allow players to go down to the surface of a planet so I have ignored anything ROAM related. At the moment I am drawing a cube with VBOs and mapping onto a sphere. I am familiar with most fractal heightmap generating techniques and have already implemented my own version of midpoint displacement (not that useful in this case I know). My question is, what is the best way to procedurally generate the heightmap. I have looked at libnoise which allows me to make tilable heightmaps/textures, but as far as I can see I would need to generate a net like this. Leaving the tiling obvious. Could anyone advise me on the best route to take? Any input would be much appreciated.

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• MySQL tech writer position on Oracle jobs site

  - by stefanhinz

  Just in case you missed this, last week I announced that my team is looking for an experienced technical writer. Now the job offer has gone live on the Oracle website. Have a look! That's the EMEA job site, but the position is actually available for Europe or North America. The job offer should appear on the American site soon, too. If you want to join a great team, or if you know someone suitable who does, don't hesitate to contact me!

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