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• Is a finite state machine an appropriate solution for this situation?

  - by user1936

  I was writing some test code as an example where I had a washing machine class. It has a door state that should be open or closed, and also a running state, either on or off. I want to prevent the running state from changing from 'off' to 'on' when the door is 'open', and also prevent the door from being set to 'open' while the machine is 'on'. I have this functionality rigged up with a bunch of if statements. It feels inelegant and it could quickly turn into spaghetti code if I want to add another state that puts additional conditions on the changes of other states. I wonder, is a finite state machine a solution for this situation? Would it simplify adding states and defining valid transitions?

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• Language-independent sources on collision detection

  - by Phazyck

  While making a Pong clone with a friend, we had to implement some collision detection. For research purposes, my friend dug up a book called "AdvancED Game Design with Flash" by Rex Van Der Spuy. This book was clearly targeted at implementing collision detection in ActionScript, and I also have some problems with how the concepts are presented, e.g. presenting one method as better than another, without explaining that decision. Can anyone recommend some good material on collision detection? I'd prefer it if kept the implementation details as language-independent as possible, e.g. by implementing the concepts in pseudo-code. Language-specific materials are not completely unwelcome though, though I'd prefer those to be in either Java, C#, F# or Python or similar languages, as those are the ones I'm most familiar with. :-) Lastly, is there perhaps widely known and used book on collision detection that most people should know about, like a 'the book on collision detection'?

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• Alps touchpad detected as mouse dell inspiron n5110

  - by Shota Bakuradze

  Now I know that this has been asked several times here but I couldn't find any decent solution to it. So I am running the latest Ubuntu on my dell n5110 and my touchpad is detected as a mouse, So I don't have the touchpad options avaliable. can't use multitouch and can't disable it either. I have tried the dkms driver: http://people.canonical.com/~sforshee/alps-touchpad/psmouse-alps-0.10/ but when installing it with dpkg I get the following error: ERROR (dkms apport): unable to determine source package for psmouse-alps-dkms Error! Bad return status for module build on kernel: 3.2.0-25-generic-pae (i686) Consult /var/lib/dkms/psmouse-alps/0.10/build/make.log for more information. I have installed all the updates as well. Can someone help me out with this issue?

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• WiFi AdHoc Network: Unable to access peer by ip

  - by Pranav

  I've set up a WiFi AdHoc network in Maverick and selected the IPv4 settings as "Shared to other computers". On the client computer, I joined the network with the same SSID and set IPv4 method to Manual and I gave it an IP 10.42.43.2 (As on the first computer, the auto generated IP was 10.42.43.1). From either of the computers, I'm not able to access the other using the IP (in browser). Any idea why? (If I browse to 10.42.43.1 from the first computer, it works) Thanks!

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• Mouse disables on key press, but touchpad doesn't

  - by Dan

  My mouse cursor disables for 1-2 seconds when the keyboard is used. This can make gaming especially difficult. The touchpad is fine; I can use it at the same time as the keyboard. Doing some forum searching, I can see that going to mouse and touchpad touchpad disable touchpad when typing works for the touchpad, but I still have the problem when using the mouse. I've tried using synaptiks, and setting the 'automatically switch off touchpad on keyboard activity' time to 0 seconds doesn't seem to work either. I'd appreciate any help.

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• Is it safe to have no TOS or PP?

  - by JamerTheProgrammer

  I have coded my own forums from the ground up. I have tried my best to make my code as secure as possible and encrypting everything I can. I want to use this forum for a Minecraft server. I have one concern however.... I would like to setup this forum now but having no TOS or Privacy Policy has put me off. Will having none of either cause me any legal trouble in the unlikely event of a data leakage? Thanks

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• Install Opera on 64-bit

  - by maaartinus

  I tried to follow the instructions on the opera page, but it didn't work. I was assuming the base install should be the same for 64-bit, but it doesn't look so. After executing wget -qO - http://deb.opera.com/archive.key | sudo apt-key add - successfully sudo apt-get install opera says Reading package lists... Done Building dependency tree Reading state information... Done Package opera is not available, but is referred to by another package. This may mean that the package is missing, has been obsoleted, or is only available from another source E: Package 'opera' has no installation candidate Below on the page I see A 64 bit Linux version is available, you should get it automatically either from the repositories or from Opera I haven't tried to download it manually, since I prefer to get it from a repo. It it possible?

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• How can I edit/create new launcher items in Unity?

  - by Ike

  Will Unity allow making custom launcher icons from .desktop files or via menu editing system? (Right now the launcher doesn't give the option to "keep in launcher" on all programs. For some programs I use, I have to make custom launchers or .desktop files. For instance, daily blender builds are generally just folders with an executable. In basic gnome or kde, I can make a new menu entry with the menu editing system. Then, I can also add it to docky either from the menu or by dragging a .desktop file to it. Unity launcher doesn't support drag and drop, so thats not a bug or anything, but when i open a .desktop file, it has unpredictable results. Most time it will not have"keep in launcher". Sometime it will have a pinnable item without the .desktop's icon, and if i pin the item to the launcher, it will not call upon the program again after closing it. I've also gotten it to just work with a .desktop file for "celtx".

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• What is the difference between Constant Vertex Attributes and Uniforms?

  - by Samaursa

  According to the OpenGL ES 2.0 Programming Guide: A constant vertex attribute is the same for all vertices of a primitive, and therefore only one value needs to be specified for all the vertices of a primitive. For uniforms the book states: ...any parameter to a shader that is constant across either all vertices or fragments (but that is not known at compile time) should be passed in as a uniform. I've always used uniforms for data that is constant for a primitive but now it appears that attributes can also be used in the same way. Is there more to constant vertex attribute than simply 'they are the same as uniforms'?

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• Getting photos and music on/off samsung/google galaxy nexus (ice cream sandwich) phone

  - by wim

  I am having trouble to access the filesystem on my phone. It just worked in previous version of Ubuntu, but now it appears empty whether it is mounted with MTP or PTP. I have followed a few guides on building and reinstalling libmtp etc without success. This answer did not help for me, either, and gMTP just hangs when I click the connect button. I know I can use wifi e.g. airdroid to access my photos, but this is too slow and a bit clumsy for me, and downloaded photos lose their original timestamps. Has anyone had success connecting to this phone on 12.04 ??

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• In which directory to write game save files/data?

  - by Klaim

  I need a definite list of directories, one or more per platform, where to put game save files and other game generated data. Either based no the OS developer specification, or because it is common usage if there is no recommandation. Please provide one answer per platform, with different directories. Also, example of how to get the directory location in C++ or C is best, as it's the language you'll have more hard time. Locations: Player's game data (saved games, config). Shared game data (like high-score or config for all computer users). Temporary game data (aka cache directory).

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• What options are there for integrating with payment gateways? [closed]

  - by Rowland Shaw

  It seems that there are only two types of payment gateway service out there at the moment; Either that the entire cart logic is handled offsite (with something like Paypal's Standard option) or the other option being that you need to go through the certification for handling credit card numbers and doing pretty much everything yourself. Ideally, for the project I'm working on, I'm after a bit of middle ground such that I can handle the cart on-site, and only pass over to a payment gateway (with an order amount, billing & delivery details, and order ref) for them to handle the card details, before passing back. I'm sure that I've used e-commerce sites using this pattern before, but I cannot find any payment providers out there that offer this sort of option, so are there any? The only over requirement we have at present is that it must accept orders in Sterling.

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• Plugging two external screens to laptop via VGA and HDMI

  - by avilella

  I have an Asus U30JC laptop with a VGA and HDMI ports. I can connect my external screen (1920x1200) to either of those ports but I wonder if I would be able to use two screens at the same time, one plugged to the VGA and the other to the HDMI socket. Any ideas? Where should I find out? Doing xrandr, I get: Screen 0: minimum 320 x 200, current 1366 x 768, maximum 8192 x 8192 LVDS1 connected 1366x768+0+0 (normal left inverted right x axis y axis) 293mm x 164mm 1366x768 60.0*+ 1360x768 59.8 60.0 1024x768 60.0 800x600 60.3 56.2 640x480 59.9 VGA1 disconnected (normal left inverted right x axis y axis) HDMI1 disconnected (normal left inverted right x axis y axis) DP1 disconnected (normal left inverted right x axis y axis)

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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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• Ubuntu 11.10 Gnome Shell new window focus problem

  - by grafthez

  I'm using gnome shell with new ubuntu for few days now and have experienced really annoying behaviour with new windows. Sometimes when I use another window and press e.g. Alt Ctrl T to open new terminal window, I don't get this window being brought to front. Instead I get notification at the bottom that "New terminal window is ready to use". The same is with Pidgin being integrated with gnome shell (via extension). Every time I get new message, window pops up but doesn't show. I need to either Alt Tab it or click the notification. Is there any way to have new windows being always brought to front, and remove those annoying "Window is ready" notifications?

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• How do I set my environment up for TopCoder?

  - by Nils

  I tried out TopCoder today. While I liked the problem, the Java editor didn't work for me. The remote compiling time and the lack of unit tests also made it difficult to complete the task. I ended up coding the solution in Eclipse and the pasting it into the TopCoder window. I tried out EclipseCoder, but it didn't suit my needs either. What tools do you use and how do you hook up your development environment with TopCoder? How does TopCoder handle submissions, and is there any way to speed up the time it takes to process them?

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• New HDD formating on Ext4 root permission

  - by Carlos Salmeron

  OK people good evening, I have this new 80Gb HDD I want to use it as a backup storage for my actual system (14.04) not a server. I formatted it with Gpart but I just can't write in it, when I search for permissions it tells me that only root users can write/create in it, log on as root user and try to change permissions, and I can't do that either. Long have I searched for an answer, looking everywhere but not to find any, is there a way to format it and use it with my user permission? Don't want it on NTFS, is there a way?, I have searched in these forums but there’s only an answer to format it in NTFS, so please. Thank you in advance.

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• If I release a program under GPL, do I have to continue to do so?

  - by Kos

  Consider this scenario: I am developing a program FooSuite that uses a GPL-licenced library QuuxTools I release the program FooSuite 1.0 under GPL Later on I discover that, for some reason, I need to licence the program to someone on different terms. Hence: I remove the dependency on GPL via QuuxTools, by either... rewriting the program not to use this library any longer obtaining a different licence for QuuxTools (if it's dual-licenced; see PyQt) I release FooSuite 1.1 under a non-GPL licence. However, FooSuite 1.1 is still a derivative work from FooSuite 1.0. I understand that it's not legal for a stranger to do what I did, but am I myself - as the owner of FooSuite - free from this restriction?

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• Conscience and unconscience from an AI/Robotics POV

  - by Tim Huffam

  Just pondering the workings of the human mind - from an AI/robotics point of view (either of which I know little about)..   If conscience is when you're thinking about it (processing it in realtime)... and unconscience is when you're not thinking about it (eg it's autonomous behaviour)..  would it be fair to say then, that:   - conscience is software   - unconscience is hardware   Considering that human learning is attributed to the number of neural connections made - and repetition is the key - the more the connections, the better one understands the subject - until it becomes a 'known'.   Therefore could this be likened to forming hard connections?  Eg maybe learning would progress from an MCU to FPGA's - therefore offloading realtime process to the hardware (FPGA or some such device)? t

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• I'm Sick of Web Development - What avenues are open to me ...?

  - by 5arx

  I've been working as a web developer since 1998, mostly with ASP/ASP.Net/C# but began as a Java coder (JSP mostly). Its been fun but now I'm feeling jaded and can see the need for a change. I've considered iOS/Cocoa development and Android development recently (Objective-C looks hard while I'm a former Java developer) but I'm not sure of Career opportunities being proficient in either would afford The incline of the learning curve - I just turned 40 and I know I'm not as sharp or as quick as I once was. Does anyone have any experiences/ opinions/ advice for me? Thanks.

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• ubiquity "hangs" after hitting first "forward" button

  - by bumbling fool

  I've been trying to install Ubuntu but, no matter what I try (wifi connected, wifi not connected, disk blank, disk prepartitioned...), it just "hangs" at the first window (pick your language) with a non-stop hourglass after hitting "forward". This is on a Stinkpad T42. Shouldn't ubiquity at least tell me what's going on? I tried to find a log but /var/log/installer* isn't present. Initiating ubiquity from command line doesn't provide any debug info either. Even when using --debug or other combinations.

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• How to add a shortcut for Humble Bundle games in Unity?

  - by waspinator

  I downloaded some games from the humblebundle, but most of them don't have deb files. They run fine after extracting them and double clicking on the executable, but unity doesn't automatically find them so I can't search for them, or add them to the side bar. I tried to drag the executable onto the side bar, but it just dimmed and didn't do anything once I dropped it. I also tried to right-click on the executable in and clicked on "Make Link", but I couldn't drop that onto the side bar either. I would prefer a solution that does not require using the terminal or editing configuration files by hand if possible.

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• Keyboard freezes when xorg crashes

  - by gsedej

  Situation is like that. Many times has happened that Xorg freezes and with it also keyboard. Quite some times because of some Compiz effects or Flash (fullscreen switch). Keyboard becomes totaly unresponsive, while mouse still works (I can move cursor, but can't click since desktop freezes) and music still plays and I can connect trough ssh. This is the only way I know I can try to solve problem - either by killing browser&flash or lastly restarting xorg server. This problem appears on more than one Ubuntu computer. My home dekstop with proprietery nvidia driver, on my work where I use noveau driever (opensource driver for geforce) and sometimes (but rarely) also on laptop with ATI graphics (using r300g driver which is really good!). Can someone explains why mouse still works while I can't input from keyboard? (I can't switch to virtual console or do R-E-I-S-U-B command) I have USB keyboard and USB mouse.

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• Does XNA/MonoGame have a text caching mechanism, or has an open source one been implemented?

  - by Casey

  I'm playing around with MonoGame, and I've noticed the SpriteFont class draws static text very inefficiently. Each time the text is drawn the spacing is recalculated. This isn't a big deal on my quad core PC, but on mobile applications it might be a problem. Before I go and program some text which caches the arrangement of its letters in an array and then feeds that array to the SpriteBatch, I would like to make sure there isn't something available to do this already, either in MonoGame itself or a class someone has implemented and made available for general use.

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• Bzr to git migration

  - by Sardathrion

  I am planning to do two things on several large (several gigs) and old (several years) repositories: Move from bzr to git without losing the commit history. Restructure all the repositories either using bzr or git. This will involve moving files/directories from one repository to another with its change history. Doing both at once would be foolish (I think!) but I am not sure which one should be done first. Any suggestions? Anything I should watch out for when migrating/restructuring?

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