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• XNA - Debugging/Testing Individual Sprites and Pixel Collision

  - by kwelch

  I ran through the first training on XNA where you make a shooter game. They did some thing that I would not do and I want to use their starting point to learn more things. I want to try better collision and adding a menu. I saw something online with the sonic physics where they have a frame by frame of sonic moving 1 pixel. See picture below. I am new to development, but I have been programming for years now. What would you guys suggest to try these different things out. How would I simulate a similar frame by frame testing as they do in the above picture? Thanks!

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• Why can't get past the user info screen when installing 10.10?

  - by Faceless

  I have a Dell Inspiron 1318 (07-08?) with an Intel Cored 2 Duo Processor and 3 GB of RAM. I can run Ubuntu 10.10 from the disk, but I've tried to install it three times with no success. As the files are installing, the program asks me to enter my user information. I'm fine through the time zone screen, and fine through the keyboard screen. But when it asks me to set my used name and password, the "next" button stays ghosted out no matter what I enter. Eventually, the installation gets to the point where it says it's waiting for me, but no matter what I do I can't get the "next" button to click. I'm a complete newbie, and I've been stuck at the same spot three times. If anyone has any idea what's going wrong, I'd love to hear about it.

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• Proxied calls not working as expected

  - by AndyH

  I have been modifying an application to have a cleaner client/server split to allow for load splitting and resource sharing etc. Everything is written to an interface so it was easy to add a remoting layer to the interface using a proxy. Everything worked fine. The next phase was to add a caching layer to the interface and again this worked fine and speed was improved but not as much as I would have expected. On inspection it became very clear what was going on. I feel sure that this behavior has been seen many times before and there is probably a design pattern to solve the problem but it eludes me and I'm not even sure how to describe it. It is easiest explained with an example. Let's imagine the interface is interface IMyCode { List<IThing> getLots( List<String> ); IThing getOne( String id ); } The getLots() method calls getOne() and fills up the list before returning. The interface is implemented at the client which is proxied to a remoting client which then calls the remoting server which in turn calls the implementation at the server. At the client and the server layers there is also a cache. So we have :- Client interface | Client cache | Remote client | Remote server | Server cache | Server interface If we call getOne("A") at the client interface, the call is passed to the client cache which faults. This then calls the remote client which passes the call to the remote server. This then calls the server cache which also faults and so the call is eventually passed to the server interface which actually gets the IThing. In turn the server cache is filled and finally the client cache also. If getOne("A") is again called at the client interface the client cache has the data and it gets returned immediately. If a second client called getOne("B") it would fill the server cache with "B" as well as it's own client cache. Then, when the first client calls getOne("B") the client cache faults but the server cache has the data. This is all as one would expect and works well. Now lets call getLots( [ "C", "D" ] ). This works as you would expect by calling getOne() twice but there is a subtlety here. The call to getLots() cannot directly make use of the cache. Therefore the sequence is to call the client interface which in turn calls the remote client, then the remote server and eventually the server interface. This then calls getOne() to fill the list before returning. The problem is that the getOne() calls are being satisfied at the server when ideally they should be satisfied at the client. If you imagine that the client/server link is really slow then it becomes clear why the client call is more efficient than the server call once the client cache has the data. This example is contrived to illustrate the point. The more general problem is that you cannot just keep adding proxied layers to an interface and expect it to work as you would imagine. As soon as the call goes 'through' the proxy any subsequent calls are on the proxied side rather than 'self' side. Have I failed to learn or not learned something correctly? All this is implemented in Java and I haven't used EJBs. It seems that the example may be confusing. The problem is nothing to do with cache efficiencies. It is more to do with an illusion created by the use of proxies or AOP techniques in general. When you have an object whose class implements an interface there is an assumption that a call on that object might make further calls on that same object. For example, public String getInternalString() { return InetAddress.getLocalHost().toString(); } public String getString() { return getInternalString(); } If you get an object and call getString() the result depends where the code is running. If you add a remoting proxy to the class then the result could be different for calls to getString() and getInternalString() on the same object. This is because the initial call gets 'deproxied' before the actual method is called. I find this not only confusing but I wonder how I can control this behavior especially as the use of the proxy may be by a third party. The concept is fine but the practice is certainly not what I expected. Have I missed the point somewhere?

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• Why can't I get to a shared folder from Windows

  - by Ron

  I want to access a folder on my new Ubuntu 12.10 box from any machine on my network without the need to provide credentials. My machine name is Ubuntu1 I have a 2TB disk that formatted NTFS that has media on it The mount point is mount1 I have numerous folders on the disk and I want to share each of them individually I have enabled folder1 and folder2 for sharing I have enabled shared access, Allow others to create and delete files in this folder and guest access is allowed. The folder icon now has arrows so I assume all is good. From windows I can see under network Ubuntu1folder1 Ubuntu1folder2 When I click to open the folder from windows I get the error "You cannot access \Ubuntu1\folder1 You do not have permission to access \Ubuntu1\folder1 I have them both on the same workgroup. Your assistance would be appreciated

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• How to Get Vine App for Windows Phone in Canada

  - by D'Arcy Lussier

  Originally posted on: http://geekswithblogs.net/dlussier/archive/2013/11/12/154613.aspxI wanted to download the Vine app for Windows Phone, but I couldn’t find it in the app store when I browsed it on my Nokia. I went to the app’s page on the app store where I saw this: One of my Twitter peeps from Winnipeg, Len, commented that he was able to install it from the website. So I went back and noticed that there’s a “Download and Install Manually” link towards the bottom of the page, which will let you download the .XAP file directly. So I emailed myself the link, opened it on my phone, and voila – Vine is now installed! What’s the point of limiting apps by region if we can just manually download and install the file anyway? Weird. D

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• Le MPEG LA s'attaque au VP8 et au WebM de Google, le consortium cherche des brevets utilisés illégalement par le codec open-source

  Le MPEG LA s'attaque au VP8 Et au WebM de Google, le consortium cherche des brevets qui seraient utilisés illégalement par le codec open-source La lutte qui oppose les industriels soutenant le H.264 et les partisans du libre autour des codecs vidéo est sur le point de se transformer en confrontation devant les tribunaux. L'organisme MPEG LA en charge des droits sur le codec H.264 vient en effet de lancer un appel à tous les industriels qui estiment détenir des brevets potentiellement utilisés par le codec concurrent, le « VP8 », racheté et décliné sous licences libres par Google avec WebM. L'objectif de cet appel est d'étudier la possibilité de constituer une commun...

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• How to script a reinstall (apt repo's and installed packages)

  - by Kurtosis

  I need to wipe my hard drive and reinstall Ubuntu. /home is on a separate partition, so I can back that up to a backup drive, then copy it back to the wiped drive, install ubuntu, and point it at the existing /home, no problem. However, I also want to script a reinstall of all my apt repo's and the packages I currently have installed, so I don't have to waste hours doing that manually. Anyone know a good way to do this? PS - At least, I'm pretty sure I have to wipe the drive. Need to install Windows 7, and only have an HP system restore disk that formats the whole drive, and not a legit Windows 7 install disk that lets me install on a single partition. If somebody know a way to trick the system restore disk to install only to a single partition, I'd love to hear it.

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• Essbase Data precision unraveled

  - by THE

  (guest reference added by Nancy) Anyone who has been working with Data import and exoport as well as the Essbase Excel Add In has probably come across a phenomenon that is called data precision: Lots of zeroes are added to any given number that has been calculated by Essbase, and this gets displayed as "10.0000000000001" or "9.99999999999999" instead of a simple "10" . This question is one of the recurring ones that Support get asked over and over again, and we therefore feel the need to give an explanation to it: I would like to point you to the note The Limits of Data Precision in Essbase (Doc ID 1311188.1) which explains in detail why these numbers are showing up and what to do about it.

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• How can I redirect everything but the index as 410?

  - by Mikko Saari

  Our site shut down and we need to give a 410 redirect to the users. We have a small one-page replacement site set up in the same domain and a custom 410 error page. We'd like to have it so that all page views are responded with 410 and redirected to the error page, except for the front page, which should point to the new index.html. Here's what in the .htaccess: RewriteEngine on RewriteCond %{REQUEST_FILENAME} !-f RewriteRule !^index\.html$ index.html [L,R=410] This works, except for one thing: If I type the domain name, I get the 410 page. With www.example.com/index.html I see the index page as I should, but just www.example.com gets 410. How could I fix this?

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• Nautilus only starts as root user

  - by user7978

  Hello. I am running Ubuntu 10.04 64-bit. When I attempt to start Nautilus from the command line, it does not appear -- although a PID is generated. As root/sudo, I can start Nautilus fine. One note: I run e16 as the windows manager, so I do not use Nautilus to draw my desktop. However, even under this configuration, Nautilus used to run fine as a "regular" user. The permissions for Nautilus are the same as the other packages in /usr/bin. I believe this is a Gnome issue, but I'm fumbling at this point.

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• Why is better to use external JavaScript or libraries ; and is it prefered to use jquery meaning more security?

  - by shareef

  I read this article Unobtrusive JavaScript with jQuery and I noticed these points in the slide page 11 some companies strip JavaScript at the firewall some run the NoScript Firefox extension to protect themselves from common XSS and CSRF attacks many mobile devices ignore JavaScript entirely screen readers do execute JavaScript but accessibility issues mean you may not want them to I did not understand the fourth point. What does it mean? I need your comment and responses on these points. Is not using JavaScript and switching to libraries like jQuery worth it? UPDATE 1 : whats the meaning of Unobtrusive JavaScript with jQuery ? and yes it does not say we should use libraries but we should have them on external files for that reason i asked my question.

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• Open Source: Is Testing/Bug Reporting A Major Contribution?

  - by dsimcha

  When evaluating contributions to open source projects, does testing the code on various real-world inputs, reducing a large number of complicated bugs to small test cases and filing good bug reports count as a significant contribution? I've done this for several open-source projects (specifically D compilers) where I wanted to help out but the codebase was too complicated to learn my way around in the amount of spare time I have. I'm interested in both the perspective of the main developers (those that write the code and fix the bugs) and from the perspective of employers (in case I want to put it on my resume at some point).

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• 12.10 shutdown/power-up issue

  - by Morten Soelling

  I have just upgraded to 12.10 on a Shuttle XPC which I use mainly for XBMC and have a problem with shut down/power up. When I shut down from within XBMC the box seems to shut down correctly, but it won't always start again. It hangs before it reaches the point where it mounts the disc's. If I disconnect power shortly and then start up again everything works as it should. It isn't quite repeatable and it does not seem to happen if I exit XBMC and then power down. During power up there seems to be an issue about timing when mounting discs. What could it be ?

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• Box 2D Collision Question

  - by Farooq Arshed

  I am very new to Box 2D Physics world. I wanted to know how to collide 2 bodies when one is Dynamic and other is Kinematic. The whole Scenario is explained below: I have 3 balls in total. I want to balls to remain in their places and the third ball to be able to move. When the third ball hits the other two balls then they should move according to the speed and direction from which they were hit. My gravity of the world is 0 because I only want z-axis gravity. I would also like some one to point me towards some good tutorials regarding Box 2D basics which is language independent. I hope I have explained my scenario well. Thanks for the help in advance.

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• How do I install pgAdmin III for postgreSQL 9.2?

  - by Vector

  I have a Windows server that runs postgresql 9.2. I want to hit it using pgAdmin III from my Ubuntu 12.10 workstation box. I installed pgAdmin III from synaptic and also tried direct download from postgreSQL site using software installer. Regardless, I can get only get pgAdmin III for postgresql 9.1. When I run pgAdmin III and point to my server I get an error message telling me that the database is 9.2 and my pgAdmin III is for 9.1, isn't compatible with 9.2. I can access the server itself fine OK from the Ubuntu box - I have Python programs that hit the database with no problems - but I need pgAdmin III for 9.2 running under Ubuntu 12.10. Is it available? Where do I get it?

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• Constraints while designing the Java generics

  - by Andrea

  Java generics look quite different from those available in Scala, although both were designed by Martin Odersky. From my point of view, the design of generics in Java is worse, for instance: there is no possibility to specify variance one can get around the previous limitation by using wildcards, but this means the burden of specifying variance goes on the caller instead of the library designer one cannot use a type constructor in generics What were the constraints in Java that forced Odersky to design this mechanism for generics instead of the more flexible one he devised for Scala? Was he just savvier a few years later or there were actual limitations due to Java?

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• practical way to learn C?

  - by jondavidjohn

  I want to dig into C and normally when I want to learn a new language I think of a simple/attainable project goal that has some practical purpose (make use of an api, automate a task, etc...) I'm having a harder time coming up with one for C mainly because everything I read points to the fact that C's primary use currently is in embedded systems and more complex software projects like operating systems. Does this point me to the fact that I don't need to learn it or that I just need to be a bit more convoluted in my learning strategy? References to practical learning resources? (tutorial/how to that produces an end result that has some purpose/benifit)

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• Ubuntu 13.04/13.10 - low graphics mode/black screen after login

  - by Richard Stokes

  Since last week, my Ubuntu 13.04 installation started booting up in low graphics mode out of nowhere. I tried a number of solutions found on this site but to no avail. The other night, I decided to upgrade to 13.10 to see if the issue would be fixed in the process. Since then, the system starts fine, but when I login to my account, I'm just presented with a black screen. I switched to the terminal and did any necessary updates, but to no avail. I don't even know where to start debugging this issue, so I'd appreciate if someone could point me towards the first place to start looking?

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• How to recover an interrupted 12.04 upgrade from 11.10?

  - by martin

  Ok, I will get right to the point. I was upgrading ubuntu to 12.04 from 11.10 (x64) and right in the middle of the package installation I had a freeze (not ubuntu's fault) forcing me to do a hard reset of my pc. Now the ubuntu installation is completely broken I can only get access via recovery mode. I already tried "apt-get update && apt-get upgrade" and the option to fix broken packages. Nothing changed. So I'm wondering if its possible to fix the broken packages, or maybe to restore before the upgrade? Thank you in advance.

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• Teaching: How can you motivate students to comment?

  - by keflavich

  I remember when I was taught, "comments are the most important part of code." Or rather, when I was told that comments are the most important part of the code. I don't think I was convinced, and I still see common cases where programmers are not convinced of the necessity of good & thorough comments. I am certainly convinced myself at this point - trying to read, in particular, complex formulae that call functions that call other functions that I don't understand - but I don't know how to convey this to students.

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• Vector.Unproject - Checking if a model intersects a large sprite

  - by Fibericon

  Let's say I have a sprite, drawn like this: spriteBatch.Draw(levelCannons[i].texture, levelCannons[i].position, null, alpha, levelCannons[i].rotation, Vector2.Zero, scale, SpriteEffects.None, 0); Picture levelCannon as being a laser beam that goes across the entire screen. I need to see if my 3d model intersects with the screen space inhabited by the sprite. I managed to dig up Vector.Unproject, but that seems to only be useful when dealing with a single point in 2d space, rather than an area. What can I do in my case?

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• Ubuntu 13.10 Security Key

  - by Toby J

  I was attempting to install Ubuntu 13.10 today and it came up with a screen asking for me to setup a security key. In the first place, I'm not sure what a security key is, but It said I would have to enter it everytime I booted Ubuntu so I assume it's the same thing as a logon password in Windows 8. Is there anyway I can bypass this step without setting up a security key or logon password? I hate these things and have always avoided them in Windows. I don't need them as there is never anyone but myself and my wife on our computers. We are retired, no children or nieces, nephews, friends, etc. who ever use our computer and we don't have any security information such as SS #, etc. on it. Also, I quit the installation at this point but I was not seeing any of the screen prompts as listed in the setup instructions on the Ubuntu website. Has the setup for Ubuntu 13.10 changed since these instructions were written? Thanks

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• Precise pangolin won't install

  - by Percival Júnior

  I've been an ubuntu user since first release but now I can't install precise beta 2 32bits and neither 64. Tried so many times, already download nighly isos but nothing. 11.10 installs smoothly (usint it). My hardware is a samsung notebook 4gb of ram.., 25 gb partition for precise. I'm gonna tell you what actually happens... I boot from usb driver and I choose my language (portuguese - brazilian) choose partition till there everything is normal. But when I Put my name user and password and give NEXT the screen to choose my region appears a click Next again and at this point I get STUCK !!! NOTHING HAPPENS. I've waited for hours and all the system freezes. When I try to reboot,, my grub is gone. Thanks for the help.

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• Odds For Fighting Game

  - by thinkfuture

  I'm creating a fighting game where two opponents face off against each other in the ring. While I've been able to figure out the odds of a player winning based on previous wins/losses, I have yet to find a formula which modifies those odds based on opponent. For example: Player 1: W:5 L:5 - 1/1 odds Player 2: W:5 L:0 - 1/5 odds I want to calculate the odds that Player 1 will wins against player 2. Compounding this the players could be of different levels: if the players are within a few levels of each other, the odds should map closely to wins/losses. However, as the levels diverge, the odds of the lower level player winning reduce. As a swag: Player 1 - W:5 L:5 - 1:1 odds Against a level 8 - 1:2 Against a level 9 - 2:3 Against a level 10 - 1:1 Against a level 11 - 3:2 Against a level 12 - 2:1 These are just estimates, my sense is that there is a math formula out there which will calculate that - can anyone out there point me to what this could be? Thanks...Chris

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• How to Get the Folder Name of USB Disk?

  - by Kate Moss' Open Space

  When an USB Disk plugs into CE/Mobile based device, how do you know the folder name of the mounting point? Usually, it should be "USB Disk" but it is really depends on how OS image builder; they may change the folder name for whatever reason. FindFirstFlashCard looks simple and promising, the drawback is it only available on Windows Mobile. In fact, these find flash card API set will enumerate all of the mountable file system which includes SD card, CF and etc that we don't expect to get. So I am going to introduce you another way via Storage Manager. Here is the steps.

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